TS 001 reports for power supplies
All: In pursuing Australian approvals for ITE, I am getting requests for TS 001 reports for the system power supplies. These PSUs are embedded in the host ITE system (i.e., they are a component of that system), and the PSUs have CB Scheme reports that include the Australian variations. The systems have CB Scheme reports that include the PSU reports. I agree that the end system should have a TS 001 report, and if circuit packs are approved individually, those that connect to a telecom network should have TS 001 reports...but a power supply doesn't seem to fit the scope of TS 001. I have in the past supplied TS 001 reports for PSUs, but it seems silly, and I'd rather not do it unless it really is a requirement. John Boucher Lucent Technologies - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Laser Standards
My company uses a 2 mw laser to align a reverse screen projector system. It is my understanding that this low power laser falls under the classification of Category 1 and is by definition, relatively safe. I thought I would purchase a copy of EN 60825 to ensure that we have address proper labeling and markings. Unfortunately this standard has 6 parts and could cost upwards of $800-1000. Can someone suggest which section I should order to identify the respective marking requirements. Thanks in advance... Rick Busche Evans Sutherland rbus...@es.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Conduit entry dimensions
The metric table that Anton provided seems to say that trade size ½ inch is the same as 16 mm. However, the OD of trade size ½ inch is 20.7 mm, but EN 60950 says the OD of 16 mm conduit is 16 mm. Obviously, something does not compute. I hope its not me. - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
The Doors
No, it is not about the rock group. It is about the doors of GR-1089-CORE. Over the last couple of days I have enjoyed observing multiple opinions and supporting evidence of the proper limit to apply to a product that has no cabinet doors (Table 3-1 Vs Table 3-2). It is clear that at minimum, the emission levels with cabinet doors open must meet the open door requirement and with cabinet doors closed must meet the closed door requirement. Perhaps this is a fine way to limit the shielding effectiveness of the enclosure so that in real life, when the doors have been removed and tossed, the threat of interference remains low. And how about cabinet doors. That type of language seams to indicate a large 7ft cabinet in which rack mount devices are contained. Is the actual housing/chassis of the EUT considered a cabinet ? There does seam to be an indication that another type of door exists - one that is not intended to be opened during EUT operation, maintenance, and/or repair. What type of door is this that remains closed during all of those circumstances. And what is the un-identified operation mode for which it is opened? And now finally for equipment that is not intended to be placed in a cabinet - maybe table-top or open-rack type. Notwithstanding the ultimate decision being driving by the RBOCs, what do you think? See some of you at the conference next week. Regards, Dale Albright EMCI
RE: Conduit entry dimensions
is this what your looking for? Anton (Tony) J. Nikolassy Project Engineer, Electrical Section Factory Mutual Research Corp. Ph: 781-255-4819 Fx: 781-762-9375 e-mail: anton.nikola...@factory-mutual.com -Original Message- From: WOODS, RICHARD [mailto:wo...@sensormatic.com] Sent: Thursday, October 07, 1999 10:47 AM To: 'emc-p...@ieee.org' Subject: RE: Conduit entry dimensions Folks, all of the information on NEMA sizes is moot since the original question was regarding metric sizes - 16 mm in particular - used in Europe and most elsewhere in the world. Any information on holes for metric fittings would be appreciated. -- From: Bill Lawrence [SMTP:wlawr...@capecod.net] Sent: Thursday, October 07, 1999 10:29 AM To: Lacey,Scott; 'Jim Eichner' Cc: 'emc-p...@ieee.org' Subject: Conduit entry dimensions Some dimensions for typical sizes of knockouts: Nominal Size of Conduit Knockout Diameter 1/2 0.859 / 0.906 3/4 1.094 / 1.141 1 1.359 / 1.406 1 1/4 1.719 / 1.766 A source of the data is NEMA ICS 6. Bill Lawrence - Factory Mutual Research At 09:06 10/07/1999 -0400, Lacey,Scott wrote: Jim, I took a few quick measurements of workboxes, isolation transformers, etc. in the lab, as well as the knockout openings in the cast housings of some of our flow transmitters. 7/8 and 1 1/8 seem to be the most common for the smaller circuits, with 2 3/8 and 2 3/4 used for the heavier stuff. Check a Hubbell catalog for required sizes for cable grips, etc. Scott Lacey -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Wednesday, October 06, 1999 5:49 PM To: 'EMC-PSTC - forum' Subject:RE: EN60950 - conduit entry dimensions I have received very little response to this one, so I thought I'd post it again. Aren't there any permanently connected ITE equipment mfr's on this forum?! What do you provide in the way of knockouts or ...??? Thanks, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Thursday, September 23, 1999 10:49 AM To: 'EMC-PSTC - forum' Subject: EN60950 - conduit entry dimensions Greetings all: In clause 3.2.2 allows the provision of knockouts, cable entries, etc. in lieu of a non-detachable power cord for permanently connected equipment. In Table 10, it lists the overall diameter of conduit based on the number of conductors involved, up to 16A. In my particular application, there are 2 wires plus earth, and the current (and the branch circuit protection) is less than 16A, so the table tells me I need a knockout that can accommodate a 16.0mm O.D. conduit. If things are done there anything like they are done here, this 16mm conduit will be secured in a fitting of some sort, and the knockout needs to be matched to the fitting, not the conduit (i.e. a 16mm hole is likely too small). Is there a reference, or can anyone tell me, what the appropriate sized hole will be? Is this standardized somewhere? Thanks in advance for your help, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. - This message is coming from the emc-pstc discussion list. To
Radiated emission 60GHz
Members, We're looking for a test lab capable to measure radiated emission according to MIL-STD-461C up to 60GHz (yes, 60GHz)? Any suggestion ? Amund a...@dnv.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Hot Surface. Hot air.
Israel, There are only three temperatures to worry about: Hot, Damn Hot and Ouch. For something approaching a definition look in BS 4086 Recommendations for Maximum Surface Temperatures of Heated Domestic Equipment. The other excellent standard for defining the issue is EN 563:1994 Safety of machinery - Temperatures of touchable surfaces - Ergonomics data to establish temperature limit values for hot surfaces. The former standard has been used for many years in the UK by enforcement officers to pursue prosecutions, which is where I came across it. The latter standard is listed as a Machinery Directive document and it contains some really useful graphs of exposure time vs. temp. I refer to these regularly when testing equipment in-situ, especially laboratory and semiconductor manufacturing systems as many standards do not leave room for non-specified applications, or are vague. Your point about hot air streams is interesting and you may want to refer to the EN 60335 family of standards for guidance. As an ex-cooking product designer, the temperature of an air stream was not a regulatory requirement. It is difficult to measure accurately and hence was not called up in standards. It was an issue with respect to users, however. Alan _ Alan Brewster Compliance Certification Services 1366 Bordeaux Drive Sunnyvale, CA 94089-1005 Tel: 408-752-8166 ext. 122 Fax: 408-752-8168 e-mail: abrews...@ccsemc.com http://www.ccsemc.com -Original Message- From: Israel Yeshurun [SMTP:israel_yeshu...@stcl.scitex.com] Sent: Thursday, October 07, 1999 3:43 AM To: 'emc-p...@ieee.org' Subject: Hot Surface. Hot air. Dear Group Fellows I would like to raise the following two issues: 1) UL1950 / EN60950 Safety standards, Subclause 5.1 - Heating, Table 16 part 2, specify permissible temperature rise for external surfaces of equipment in Operator Access Area.. For external surfaces, made of metal which may be touched, it allows temperature rise of 45 degrees Kelvin, assuming ambient temperature of 25 degrees Celsius it allows surface temperature of 70 degrees Celsius = 158 degrees Fahrenheit ! Note (4) in this table applies to external surfaces that are not likely to be touched in normal use and measure less than 50 mm, in this case it allows a temperature rise of 75 degrees K, that under 25 degrees C ambient allows 100 degrees C = 212 degrees F !! Now, 70 degrees C for external equipment surface that may be touched seems pretty high to me. 100 degrees C metal surface will, I believe, cause a burn to that part of the human body that touched it. So maybe my interpretation is not true ??and, can someone point another regulatory source for Hot surface permissible temperature ? 2) Regarding Hot air flowing out of equipment, in UL1950 / EN60950 I could not find a requirement or limit for the maximum permissible temperature for it, Can someone point another regulatory source for Hot air permissible temperature ? Note: The equipment I relate to is ITE or Office, but information from Machinery standards or other sources is welcome ! Many Thanks Israel Yeshurun - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Attachment Plugs and Power Cords
Robert, I see your point (as it relates to a typcial 'consumer' item like a TV) ), but I also agree with Richard's interpretation (as it relates to ITE equipment a la UL 1950, EN60950). There are 'consumer' ITE equipment and one would expect to get a plug. But also take into consideration that the plug may be added by the domestic importer/distributor prior to placing the item on the consumer market. This is typical in many cases, especially for high-end ITE equipment which is installed in office/business environments. Many consumer ITE equipment manufacturers also use detachable power cords, and the appropriate ones are thrown into the box prior to shipment to the country of destination. John Juhasz Fiber Options Bohemia, NY -Original Message- From: Robert Johnson [mailto:robe...@ma.ultranet.com] Sent: Thursday, October 07, 1999 9:37 AM To: IEEE Subject: Re: Attachment Plugs and Power Cords If you went to the store to buy a TV and one of the sets came without a plug on the end of the cord, what would your thoughts be? You can get away without plugs in some markets, but most customers expect a functioning product, not a do it yourself project. WOODS, RICHARD wrote: I can find nothing in IEC 950 nor EN 60950 that defines the requirements for an attachment plug for equipment that is not permanently connected. Due to the silence of the standard, I conclude that an attachment plug is not required per the standard. Therefore, it appears that the plug wiring methods and strain relief must be per the national standards and/or electrical codes of each country. For example, UL 1950 has a national deviation that specifies the need for a plug. I conclude that it is acceptable to CE mark a product that has no plug and allow a certified plug to be attached in any of the EU member states. CE marking compliance will not be affected. I conclude that it is acceptable to replace a plug on a CE marked product with a nationally acceptable plug without affecting CE marking compliance. I understand that the power cord must be acceptable for use in the target country. Therefore, it is not possible to ship a single attached power cord to Asia, Eastern Europe, Africa and South America since the power cord may not be legal in the target country even if a national plug is attached. Are my conclusions and understandings correct? - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: broadband narrowband emissions
-Original Message- From: Muriel Bittencourt de Liz [SMTP:mur...@grucad.ufsc.br] Sent: Thursday, October 07, 1999 5:43 AM To: Lista de EMC da IEEE Subject: broadband narrowband emissions Group, I'd like to have a clear definition of what are narrowband and broadband emissions. This question may seem very plain for many members of EMC-PSTC, but I always heard/saw this definition for emission and I still couldn't make them clear to me.. Thanks in advance for your attention Regards Muriel -- == Muriel Bittencourt de Liz GRUCAD - Group for Conception Analysis of Electromagnetic Devices Santa Catarina Federal University - UFSC PO Box: 476 ZIP: 88040-900 - Florianópolis - SC - BRAZIL Phone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 Alternativa Adreso: mur...@esperanto.nu - Muriel: Narrowband and Broadband are the two extremes of the spectral distribution of a signal's power. The classic NB emission has all of its power contained within a narrow range of the spectrum. Think of a perfect sine wave generator, with no sidebands or frequency instability. But how narrow is narrow? All of the power is within 100 Hz? Or 10 Hz? Or 1 Hz? Or.. Classifying a signal as NB depends a lot on your prejudices and experiences. At 10 GHz, a radar signal might occupy 10 MHz of spectrum. That's a lot of spectrum to an audio guy, even though it's only 0.1% wide! My particular experience says that a signal is NB if its occupied bandwidth is around 1% or less. The classic BB emission has its power distributed over a wide range of the spectrum. Think of the spectra from an infinitely fast transition. The power will exist no matter where you choose to sample it. Practically, there are no perfect NB or BB emissions. The problem lies in where (and how) we try to define the dividing line. Should we use percentage of occupied bandwidth? Or tuneability (with what detector bandwidth)? Or maybe modulation repetition rate? Is a NB signal which hops around quickly still NB? What about two NB signals real close together? Have you ever heard the story about the 4 blind men and an elephant? Regards, Ed :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 (Voice) 619-505-1502 (Fax) Military Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Temperature probe
Greetings: Several years ago I ran some tests on welded, soldered and twisted thermocouples, ten of each type. Immersed in the same liquid. As sensor I used a Fluke, two decimal places. There was no difference between welded and soldered units. The deviation of the twisted thermocouples was less than one degree among the sample and to the others. Bogdan. Ned Devine wrote: Hi, I would think a thermocouple would be OK. It should be close to +/- 1 deg. C. If you need better accuracy, try a RTD. It should be +/- 0.1 deg. C. Ned Devine Entela, Inc. Program Manager III Phone 616 248 9671 Fax 616 574 9752 e-mail ndev...@entela.com -Original Message- From: Leslie Bai [mailto:leslie_...@yahoo.com] Sent: Wednesday, October 06, 1999 2:29 PM To: emc-p...@ieee.org Subject: Temperature probe Hello, group: Seems that my question is not relavent to this group but hope someone there could help. I am looking for an ACCURATE temperature probe ( accuracy is about +/- 1 degree C from -50 to +80 degree C). It will be used to measure the microwave frequency drifting over the temperature. It will be put in a temperature chamber. Although the chamber has a temeprature display, it's not accurate as we expected (about +/-3 degree C), thus we need a more accurate probe to perform the measurement. If you have any info or similiar probe, pls kindly let me know - the brand, model, etc... Thanks in advance. Leslie http://biz.yahoo.com/prnews/991006/ca_digit_m_1.html = __ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Attachment Plugs and Power Cords
Richard: If I am not mistaken, IEC 950 refers to IEC 390. Furthermore, attachment caps and appliance inlets you should be abl;e to find in IEC 320. IMHO, you make your life unnecessirily hard on yourself if you try to interpret standards. Bogdan. WOODS, RICHARD wrote: I can find nothing in IEC 950 nor EN 60950 that defines the requirements for an attachment plug for equipment that is not permanently connected. Due to the silence of the standard, I conclude that an attachment plug is not required per the standard. Therefore, it appears that the plug wiring methods and strain relief must be per the national standards and/or electrical codes of each country. For example, UL 1950 has a national deviation that specifies the need for a plug. I conclude that it is acceptable to CE mark a product that has no plug and allow a certified plug to be attached in any of the EU member states. CE marking compliance will not be affected. I conclude that it is acceptable to replace a plug on a CE marked product with a nationally acceptable plug without affecting CE marking compliance. I understand that the power cord must be acceptable for use in the target country. Therefore, it is not possible to ship a single attached power cord to Asia, Eastern Europe, Africa and South America since the power cord may not be legal in the target country even if a national plug is attached. Are my conclusions and understandings correct? - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Hot Surface. Hot air.
I have a copy of a standard EN 563:1994, Safety of machinery - Temperatures of touchable surfaces - Ergonomics data to establish temperature limit values for hot surfaces. It is only 18 pages but includes charts and graphs of burn threshold vs contact time for plastic, metal, and ceramic materials. Patty Elliot Qualcomm, Inc. p...@qualcomm.com At 12:47 PM 10/7/99 -0400, Peter E. Perkins wrote: Here's a post from 1997... I don't know where I got the following chart, but I believe it's from the The Shriners Burn Institute. Someone else gave it to me. If anyone recognizes this list, I would really like to know. I assume I'm quoting someone, so I take absolutely no credit for it. TEMP | Time to deg.F | deg C | Serious Burn 120 49| over 5 min 125 52| 1-1/2 to 2 min 130 55| about 30 sec 135 57| about 10 sec 140 60| under 5 sec 145 63| under 3 sec 150 66| about 1-1/2 sec 155 68| about 1 sec - - - - - Peter E Perkins Principal Product Safety Consultant Tigard, ORe 97281-3427 +1/503/452-1201 phone/fax p.perk...@ieee.org email visit our website: http://ourworld.compuserve.com/homepages/peperkins - - - - - - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Inductor
Derek: For test jigging, I always go with an air core if possible. 100 uH is #10 wire wound on a 6 diameter helix, 6 long, with about 32 turns. For a coil form, try an oatmeal can or a piece of PVC drain pipe. (That'll impress the customers!) My next choice would be a powdered iron toroid, with fairly low permeability (like 50). Depending on perm, core cross section and magnetic path length, you might find a 3 diameter core with 15 turns would be a good starting point. Time to go buy an old ESI 250 bridge on the surplus market, or like I did, get a Wavetek LCR55 DMM. It's a good cheap tool for all the reasonable values of L, C, R freq. Finally, you could try a steel rod. Perm may be 400 to 1000. Wrap on ten or so turns and see what you get. (May get warm if that's 30 Amps at 400 Hz!) Ed :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 (Voice) 619-505-1502 (Fax) Military Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) -Original Message- From: Derek Walton [SMTP:l...@rols1.net] Sent: Wednesday, October 06, 1999 4:43 PM To: emc-p...@ieee.org Subject: Inductor Hi folks, I need a low cost inductor with the following specifications: 100 microhenry, 30 amp max., operating frequency range 150 to 250 kHz max. The rest is open for grabs. An air-core, while cheap enough, is a little large. So I'm thinking about a few turns of heavy wire on a bar. Any suggestions of what this bar should be mad of? Thanks, Derek. -- Derek Walton Owner L. F. Research EMC Design and Test Facility 12790 Route 76, Poplar Grove, IL 61065. www.lfresearch.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Removable Module requirements
We have used the design you are proposing, removable modules buried inside with a front door requiring a tool to open. We also include the general service warning advising of hazardous voltages, etc. We have our medical equipment UL Classified to UL 2601 (based on en60601-1)and had no problem with the classification. Hope this helps. -Original Message- From: Paul Smith [mailto:phsm...@excite.co.uk] Sent: Thursday, October 07, 1999 5:33 AM To: emc-p...@majordomo.ieee.org Subject: Removeable Module requirements Equipment designed to the requirements of EN60439-1 requires that any removeable modules are only removeable with the use of a key or tool. That seems pretty well acceptable to me as we are protectingainst unintentional contact with potentially live parts. What if the modules are not locked in place but are covered by a door that is only opened with the use of a key (easy) or a tool (not so easy). Is this an acceptable alternative or do we need to provide 'infinite' barriers to prevent contact or is a 'lockable' door with warning labels acceptable? The only electrical device the user could contact behind the door are circuit breakers, there are no fuses etc. Any thoughts?, Thanks, Paul Excite -- Control Yourself. This E-mail brought to you by Excite's free E-mail service. Get your own E-mail address at http://www.excite.co.uk - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Hot Surface. Hot air.
One possible answer re the hot air issue: Whatever the surface is (metal grill, plastic vent slots, etc.) that the hot air is exiting the equipment from, will have to comply with the external temperature limits already cited. If the air itself is so hot that there is a burn hazard, those external surfaces will likely fail the temperature limit. Regards, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -Original Message- From: Israel Yeshurun [SMTP:israel_yeshu...@stcl.scitex.com] Sent: Thursday, October 07, 1999 3:43 AM To: 'emc-p...@ieee.org' Subject: Hot Surface. Hot air. Dear Group Fellows I would like to raise the following two issues: 1) UL1950 / EN60950 Safety standards, Subclause 5.1 - Heating, Table 16 part 2, specify permissible temperature rise for external surfaces of equipment in Operator Access Area.. For external surfaces, made of metal which may be touched, it allows temperature rise of 45 degrees Kelvin, assuming ambient temperature of 25 degrees Celsius it allows surface temperature of 70 degrees Celsius = 158 degrees Fahrenheit ! Note (4) in this table applies to external surfaces that are not likely to be touched in normal use and measure less than 50 mm, in this case it allows a temperature rise of 75 degrees K, that under 25 degrees C ambient allows 100 degrees C = 212 degrees F !! Now, 70 degrees C for external equipment surface that may be touched seems pretty high to me. 100 degrees C metal surface will, I believe, cause a burn to that part of the human body that touched it. So maybe my interpretation is not true ??and, can someone point another regulatory source for Hot surface permissible temperature ? 2) Regarding Hot air flowing out of equipment, in UL1950 / EN60950 I could not find a requirement or limit for the maximum permissible temperature for it, Can someone point another regulatory source for Hot air permissible temperature ? Note: The equipment I relate to is ITE or Office, but information from Machinery standards or other sources is welcome ! Many Thanks Israel Yeshurun - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Removeable Module requirements
Paul, If you are asking wheather an enclosure with a keylock would be acceptable means to prevent access, I would think yes. Why not? Anyone could carry a screwdriver or a set of hex wrenches around on a keychain. I would think that a key would be a more controlled means of securing access to your device. my opinion... George -Original Message- From: Paul Smith [SMTP:phsm...@excite.co.uk] Sent: Thursday, October 07, 1999 6:33 AM To: emc-p...@majordomo.ieee.org Subject: Removeable Module requirements Equipment designed to the requirements of EN60439-1 requires that any removeable modules are only removeable with the use of a key or tool. That seems pretty well acceptable to me as we are protectingainst unintentional contact with potentially live parts. What if the modules are not locked in place but are covered by a door that is only opened with the use of a key (easy) or a tool (not so easy). Is this an acceptable alternative or do we need to provide 'infinite' barriers to prevent contact or is a 'lockable' door with warning labels acceptable? The only electrical device the user could contact behind the door are circuit breakers, there are no fuses etc. Any thoughts?, Thanks, Paul Excite -- Control Yourself. This E-mail brought to you by Excite's free E-mail service. Get your own E-mail address at http://www.excite.co.uk - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Conduit entry dimensions
Thanks Richard - you're right. The North American requirements are made abundantly clear, both in overseeing doc's like the NEC and CEC and in various standards (esp. CSA No. 0 which also covers the keep-out zone required for the lock-nut). It's the European picture that needs clarification, in particular regarding EN60950 compliant equipment, and the common single-phase branch circuits such as 230Vac, 16A, 2-wire plus ground. Thanks, Jim -Original Message- From: WOODS, RICHARD [SMTP:wo...@sensormatic.com] Sent: Thursday, October 07, 1999 8:47 AM To: 'emc-p...@ieee.org' Subject: RE: Conduit entry dimensions Folks, all of the information on NEMA sizes is moot since the original question was regarding metric sizes - 16 mm in particular - used in Europe and most elsewhere in the world. Any information on holes for metric fittings would be appreciated. -- From: Bill Lawrence [SMTP:wlawr...@capecod.net] Sent: Thursday, October 07, 1999 10:29 AM To: Lacey,Scott; 'Jim Eichner' Cc: 'emc-p...@ieee.org' Subject: Conduit entry dimensions Some dimensions for typical sizes of knockouts: Nominal Size of Conduit Knockout Diameter 1/2 0.859 / 0.906 3/4 1.094 / 1.141 1 1.359 / 1.406 1 1/4 1.719 / 1.766 A source of the data is NEMA ICS 6. Bill Lawrence - Factory Mutual Research At 09:06 10/07/1999 -0400, Lacey,Scott wrote: Jim, I took a few quick measurements of workboxes, isolation transformers, etc. in the lab, as well as the knockout openings in the cast housings of some of our flow transmitters. 7/8 and 1 1/8 seem to be the most common for the smaller circuits, with 2 3/8 and 2 3/4 used for the heavier stuff. Check a Hubbell catalog for required sizes for cable grips, etc. Scott Lacey -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Wednesday, October 06, 1999 5:49 PM To: 'EMC-PSTC - forum' Subject:RE: EN60950 - conduit entry dimensions I have received very little response to this one, so I thought I'd post it again. Aren't there any permanently connected ITE equipment mfr's on this forum?! What do you provide in the way of knockouts or ...??? Thanks, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Thursday, September 23, 1999 10:49 AM To: 'EMC-PSTC - forum' Subject: EN60950 - conduit entry dimensions Greetings all: In clause 3.2.2 allows the provision of knockouts, cable entries, etc. in lieu of a non-detachable power cord for permanently connected equipment. In Table 10, it lists the overall diameter of conduit based on the number of conductors involved, up to 16A. In my particular application, there are 2 wires plus earth, and the current (and the branch circuit protection) is less than 16A, so the table tells me I need a knockout that can accommodate a 16.0mm O.D. conduit. If things are done there anything like they are done here, this 16mm conduit will be secured in a fitting of some sort, and the knockout needs to be matched to the fitting, not the conduit (i.e. a 16mm hole is likely too small). Is there a reference, or can anyone tell me, what the appropriate sized hole will be? Is this standardized somewhere? Thanks in advance for your help, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists.
Conduit Knockout Dimensions - OOPS!
After reading Bill Lawrence's posting, I realized I made a typo error. The last two numbers should have been 1 3/8 and 1 3/4. The dimensions would then be: 7/80.875 1 1/8 1.125 1 3/8 1.375 1 ¾1.750 These are nominal values - the min and max values would be those which Bill reported. I apologize for any mixups - when typing, my brain outruns my fingers. Scott Lacey - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Hot Surface. Hot air.
Here's a post from 1997... I don't know where I got the following chart, but I believe it's from the The Shriners Burn Institute. Someone else gave it to me. If anyone recognizes this list, I would really like to know. I assume I'm quoting someone, so I take absolutely no credit for it. TEMP | Time to deg.F | deg C | Serious Burn 120 49| over 5 min 125 52| 1-1/2 to 2 min 130 55| about 30 sec 135 57| about 10 sec 140 60| under 5 sec 145 63| under 3 sec 150 66| about 1-1/2 sec 155 68| about 1 sec - - - - - Peter E Perkins Principal Product Safety Consultant Tigard, ORe 97281-3427 +1/503/452-1201 phone/fax p.perk...@ieee.org email visit our website: http://ourworld.compuserve.com/homepages/peperkins - - - - - - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Luminaires standard for USA/CANADA countries
Mr. Fini, I am unsure which of the following standards you need, however, here are the standard that I located searching on fluorescent. My original search on luminaires had no matches. 542 Lampholders, Starters, and Starter Holders for Fluorescent Lamps, seventh edition, 1994 A 935 Fluorescent-Lamp Ballasts ninth edition, 1995 G 1570 Fluorescent Lighting Fixtures fourth edition, 1995 G 8730-2-3 Automatic Electrical Controls for Household and Similar Use; Part 2: Particular Requirements for Thermal Protectors for Ballasts for Tubular Fluorescent Lamps first edition, 1996 J I am under the impression that UL 542 is likely superceded by UL 1570, but you would have to check with UL, since I am not familiar with the particular standard. I am under the impression that this is likely the standard you will need, but I am not sure. The equivalent incandescent standard is: 1571 Incandescent Lighting Fixtures fourth edition, 1995 A You can perform your own searches of these standards by going to: http://ulstandardsinfonet.ul.com/catalog/part1std.html and searching on the text of the standard titles. If your luminaires are not fluorescent or incandescent, you may require a different standard. It appears that Canada has adopted a version of IEC 598 with their new CAN/CSA-E598-1-98 series of standards. Information can be found on page 49 of their electronic product catalog, which you can download at http://www.csa-international.org/english/product_services/index_catal.htm While in the English version of their webpage, the catalog is bilingual with French included in the same document. Regards, Michael Garretson Compliance Engineer RadiSys Corporation Fini Paolo paolof...@italponti.it on 10/07/99 02:16:57 AM Please respond to Fini Paolo paolof...@italponti.it To: EMC-pstc list server (E-mail) emc-p...@ieee.org cc:(bcc: Michael Garretson/Radisys_Corporation/US) Subject: Luminaires standard for USA/CANADA countries Hi all, We have some trouble , to find the UL and CSA equiv.alent standard of the EN 60598-1 for general requirements and tests of LUMINAIRES and similar. Do you can help me to fix the problem? Best regards. ing. Paolo Fini Italponti Telecomunicazioni via Reims 12, Firenze (ITALY) tel +39055689706 - fax +39055689706 www.italponti.it - paolof...@italponti.it Hi all, We have some trouble , to find the UL and CSA equiv.alent standard of the EN 60598-1 for general requirements and tests of LUMINAIRES and similar. Do you can help me to fix the problem? Best regards. ing. Paolo Fini Italponti Telecomunicazioni via Reims 12, Firenze (ITALY) tel +39055689706 - fax +39055689706 www.italponti.it - paolof...@italponti.it
RE: Schaffner ESD gun Calibration
In my previous e-mail I had indicated that I had trouble getting a quote from Schaffner for calibrating my ESD gun. Well, Schaffner has contacted me, and was very responsive in taking care of my needs. They are expediting the calibration of my equipment at no extra charge, and they appear to be taking specific steps to ensure that customer inquiries will not fall through the cracks again. I was very satisfied with their staff's professionalism and courtesy. Kudos to the folks at Schaffner for their efforts to maintain customer satisfaction. We all know that things can't go perfectly all the time, but it was the willingness to respond to issues when they arise and make sure that the customer's needs get met that impressed me. So, it ended up that I did not need to find another vendor. But, I would like to thank everyone who posted information on alternate vendors and I will be keeping the information on file for future use. Sincerely, Randall T. Flinders EMC Engineer Emulex Corporation (714) 513-8012 voice (714) 513-8265 fax randall.flind...@ieee.org __ __ __\ /__ __/ \__ E M U L E X aka.. Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Flinders, Randall Sent: Tuesday, October 05, 1999 2:36 PM To: 'emc-pstc' Subject:Schaffner ESD gun Calibration Greetings EMC Professionals - I was wondering if anyone out there in complianceland has info on any calibration vendors who provide calibration services for a Schaffner NSG-435 ESD Gun. My numerous attempts at getting a quote from Schaffner have been unsuccessful and I really need to get this thing calibrated before my next QA audit. Any leads or information would be appreciated! Thanks! Sincerely, Randall T. Flinders EMC Engineer Emulex Corporation (714) 513-8012 voice (714) 513-8265 fax randall.flind...@ieee.org __ __ __\ /__ __/ \__ E M U L E X aka.. Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org application/ms-tnef
Re: SBC TP76200MP DC Power Requirements
Jim, Thank you very much for the information. Do you have a recommendation on the Omron types? Regards, Jerry On Wed, 6 Oct 1999 08:23:55 -0500 JIM WIESE jim.wi...@adtran.com writes: You can order programmable relay controllers from Newark or Allied electronics. Omron makes some good ones for this test. They run about $150. The inductor will have to be custom built using E and I cores and if done correctly will weigh about 75 to 100 pounds (assuming you need to source any amount of current over a few amps). Good Luck, Jim Jim Wiese NEBS Project Manager/Compliance Engineer ADTRAN, INC. 901 Explorer Blvd. P.O. Box 14 Huntsville, AL 35814-4000 256-963-8431 256-963-8250 fax jim.wi...@adtran.com -- From:Jerry Martin[SMTP:martin_je...@juno.com] Sent:Wednesday, October 06, 1999 12:33 AM To: t...@world.std.com; emc-p...@ieee.org; n...@world.std.com Subject: SBC TP76200MP DC Power Requirements Does anyone have any experience with SBC's TP76200MP document? I'm specifically looking for information on how to do some of the tests in Section 8 DC Power. Where can I get/make an Electronic Switch/Relay of Figures 8-3 and 8-5? Where can I get/make the 0.08 H inductor? Any help is appreciated. Thanks, Jerry ___ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. ___ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj.
RE: Conduit entry dimensions
Folks, all of the information on NEMA sizes is moot since the original question was regarding metric sizes - 16 mm in particular - used in Europe and most elsewhere in the world. Any information on holes for metric fittings would be appreciated. -- From: Bill Lawrence [SMTP:wlawr...@capecod.net] Sent: Thursday, October 07, 1999 10:29 AM To: Lacey,Scott; 'Jim Eichner' Cc: 'emc-p...@ieee.org' Subject: Conduit entry dimensions Some dimensions for typical sizes of knockouts: Nominal Size of Conduit Knockout Diameter 1/2 0.859 / 0.906 3/4 1.094 / 1.141 1 1.359 / 1.406 1 1/4 1.719 / 1.766 A source of the data is NEMA ICS 6. Bill Lawrence - Factory Mutual Research At 09:06 10/07/1999 -0400, Lacey,Scott wrote: Jim, I took a few quick measurements of workboxes, isolation transformers, etc. in the lab, as well as the knockout openings in the cast housings of some of our flow transmitters. 7/8 and 1 1/8 seem to be the most common for the smaller circuits, with 2 3/8 and 2 3/4 used for the heavier stuff. Check a Hubbell catalog for required sizes for cable grips, etc. Scott Lacey -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Wednesday, October 06, 1999 5:49 PM To: 'EMC-PSTC - forum' Subject:RE: EN60950 - conduit entry dimensions I have received very little response to this one, so I thought I'd post it again. Aren't there any permanently connected ITE equipment mfr's on this forum?! What do you provide in the way of knockouts or ...??? Thanks, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Thursday, September 23, 1999 10:49 AM To: 'EMC-PSTC - forum' Subject: EN60950 - conduit entry dimensions Greetings all: In clause 3.2.2 allows the provision of knockouts, cable entries, etc. in lieu of a non-detachable power cord for permanently connected equipment. In Table 10, it lists the overall diameter of conduit based on the number of conductors involved, up to 16A. In my particular application, there are 2 wires plus earth, and the current (and the branch circuit protection) is less than 16A, so the table tells me I need a knockout that can accommodate a 16.0mm O.D. conduit. If things are done there anything like they are done here, this 16mm conduit will be secured in a fitting of some sort, and the knockout needs to be matched to the fitting, not the conduit (i.e. a 16mm hole is likely too small). Is there a reference, or can anyone tell me, what the appropriate sized hole will be? Is this standardized somewhere? Thanks in advance for your help, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the
R: Risposta : Italy EMI/RFI Testing
You can also contact my company : Fiat Research Centre We are a Competent Body under 89/336 And we have a Quality system ( en 45000-1) accredited from Sinal. We also have experience in the field of EMC on medical devices. Regard Ing. Giuseppe Rossi , Narte Certified Engineer -- Da: massimo.polign...@esaote.com [SMTP:massimo.polign...@esaote.com] Inviato: giovedì 7 ottobre 1999 11.02 A: Dick Grobner Cc: emc-p...@majordomo.ieee.org Oggetto: Risposta : Italy EMI/RFI Testing You can contact any of the following: 1. CESI Via Rubattino, 54 Milan - tel. ++39.0221251 - fax ++39.022125510 2. IMQ Via Quintiliano, 43 - Milano - tel ++39.0250731 -fax ++39.025073271 3. NEMKO-ALFLAB Via Trento e Trieste, 116/118 Biassono (Milan) - tel. ++39.039220120 - fax ++39.0392753240 4. Prima Ricerca e Sviluppo Via Campagna, 58 Faloppio (Como) - tel +39.031991009 - fax +39.031991309 The first one is the best equipped. The second one has great experience with medical devices as they have been performing safety test (IEC 601-1 family) as well for dozens of years. Regards m.p. - ESAOTE S.p.A. Massimo Polignano Research Product Development Design Quality Control Via di Caciolle,15 tel:+39.055.4229402 I- 50127 Florence fax:+39.055.4223305 e-mail: massimo.polign...@esaote.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Hot Surface. Hot air.
Hello Israel, I've not checked your numbers but believe the rationale is, in the case of Item 1) below: that should one come into contact with a surface at these temperatures, one will withdraw quickly and no damage is anticipated. And, in the case of Item 2) below: should one come into contact with this surface (even though unlikely one will withdraw even more quickly than in the above case; again, no damage is expected. Also, one can, and in some cases shall mark surfaces with the IEC symbol for Hot Surfaces (I don't have that symbol number at hand - sorry). Regards, Art Michael Int'l Product Safety News A.E. Michael, Editor P.O. Box 1561 INT Middletown CT 06457-8061 U.S.A. Phone : (860) 344-1651 Fax: (860) 346-9066 Email : i...@connix.com Website: http://www.safetylink.com ISSN : 1040-7529 -- On Thu, 7 Oct 1999, Israel Yeshurun wrote: Dear Group Fellows I would like to raise the following two issues: 1) UL1950 / EN60950 Safety standards, Subclause 5.1 - Heating, Table 16 part 2, specify permissible temperature rise for external surfaces of equipment in Operator Access Area.. For external surfaces, made of metal which may be touched, it allows temperature rise of 45 degrees Kelvin, assuming ambient temperature of 25 degrees Celsius it allows surface temperature of 70 degrees Celsius = 158 degrees Fahrenheit ! Note (4) in this table applies to external surfaces that are not likely to be touched in normal use and measure less than 50 mm, in this case it allows a temperature rise of 75 degrees K, that under 25 degrees C ambient allows 100 degrees C = 212 degrees F !! Now, 70 degrees C for external equipment surface that may be touched seems pretty high to me. 100 degrees C metal surface will, I believe, cause a burn to that part of the human body that touched it. So maybe my interpretation is not true ??and, can someone point another regulatory source for Hot surface permissible temperature ? 2) Regarding Hot air flowing out of equipment, in UL1950 / EN60950 I could not find a requirement or limit for the maximum permissible temperature for it, Can someone point another regulatory source for Hot air permissible temperature ? Note: The equipment I relate to is ITE or Office, but information from Machinery standards or other sources is welcome ! Many Thanks Israel Yeshurun - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Conduit entry dimensions
Some dimensions for typical sizes of knockouts: Nominal Size of Conduit Knockout Diameter 1/2 0.859 / 0.906 3/4 1.094 / 1.141 1 1.359 / 1.406 1 1/4 1.719 / 1.766 A source of the data is NEMA ICS 6. Bill Lawrence - Factory Mutual Research At 09:06 10/07/1999 -0400, Lacey,Scott wrote: Jim, I took a few quick measurements of workboxes, isolation transformers, etc. in the lab, as well as the knockout openings in the cast housings of some of our flow transmitters. 7/8 and 1 1/8 seem to be the most common for the smaller circuits, with 2 3/8 and 2 3/4 used for the heavier stuff. Check a Hubbell catalog for required sizes for cable grips, etc. Scott Lacey -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Wednesday, October 06, 1999 5:49 PM To: 'EMC-PSTC - forum' Subject:RE: EN60950 - conduit entry dimensions I have received very little response to this one, so I thought I'd post it again. Aren't there any permanently connected ITE equipment mfr's on this forum?! What do you provide in the way of knockouts or ...??? Thanks, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Thursday, September 23, 1999 10:49 AM To: 'EMC-PSTC - forum' Subject: EN60950 - conduit entry dimensions Greetings all: In clause 3.2.2 allows the provision of knockouts, cable entries, etc. in lieu of a non-detachable power cord for permanently connected equipment. In Table 10, it lists the overall diameter of conduit based on the number of conductors involved, up to 16A. In my particular application, there are 2 wires plus earth, and the current (and the branch circuit protection) is less than 16A, so the table tells me I need a knockout that can accommodate a 16.0mm O.D. conduit. If things are done there anything like they are done here, this 16mm conduit will be secured in a fitting of some sort, and the knockout needs to be matched to the fitting, not the conduit (i.e. a 16mm hole is likely too small). Is there a reference, or can anyone tell me, what the appropriate sized hole will be? Is this standardized somewhere? Thanks in advance for your help, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). Bill Lawrence South Yarmouth, MA 02664 wlawr...@capecod.net - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Luminaires standard for USA/CANADA countries
Hello Paolo, Without knowing the type of luminaire you are interested in, I offer the following for your consideration. In the USA, Portable Lamps = UL 153 In Canada, Portable Luminaires = CSA 22.2 No. 12 ALSO: A whole collection of standards which follow the IEC 598 series (as denoted by CSA in their '99 catalog). CAN/CSA-E598-1-98 is the base standard. Regards, Art Michael, Editor - Int'l Product Safety News * * * * * * * * * * * * * * * * * * * * * * * International Product Safety Bookshop * * Check out our current offerings! * * http://www.safetylink.com/bookshop.html * * * * Another service of the Safety Link* * www.safetylink.com * * * * * * * * * * * * * * * * * * * * * * * -- On Thu, 7 Oct 1999, Fini Paolo wrote: Hi all, We have some trouble , to find the UL and CSA equiv.alent standard of the EN 60598-1 for general requirements and tests of LUMINAIRES and similar. Do you can help me to fix the problem? Best regards. ing. Paolo Fini Italponti Telecomunicazioni via Reims 12, Firenze (ITALY) tel +39055689706 - fax +39055689706 www.italponti.it - paolof...@italponti.it - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
shielded enclosure installataion
My company has a 12x12 sheilded enclosure that we would like assembled for us. I prefer to have an experienced group install it so that we get the most out of it from a shielding effectiveness point of view. Please let me know if you have any leads on who would do this for me. We are located in Nashua, NH which is right on the northern MA border. Sincerely, David Clark - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: broadband narrowband emissions
Muriel, Broadband Emission - An emission which has a bandwidth greater than the device measuring it. Narrowband Emission - An emission which has a bandwidth less than the device measuring it. These definitions are right out of IEC 50, International Electrotechnical Vocabulary. The FCC considers an emission to be broadband if the emission level drops 6 dB from the peak level when measuring the same emission with the quasi-peak detector. Muriel Bittencourt de Liz mur...@grucad.ufsc.br on 10/07/99 07:42:33 AM Please respond to Muriel Bittencourt de Liz mur...@grucad.ufsc.br To: Lista de EMC da IEEE emc-p...@ieee.org cc:(bcc: Robert E. Heller/US-Corporate/3M/US) Subject: broadband narrowband emissions Group, I'd like to have a clear definition of what are narrowband and broadband emissions. This question may seem very plain for many members of EMC-PSTC, but I always heard/saw this definition for emission and I still couldn't make them clear to me.. Thanks in advance for your attention Regards Muriel -- == Muriel Bittencourt de Liz GRUCAD - Group for Conception Analysis of Electromagnetic Devices Santa Catarina Federal University - UFSC PO Box: 476 ZIP: 88040-900 - Florianópolis - SC - BRAZIL Phone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 Alternativa Adreso: mur...@esperanto.nu - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Attachment Plugs and Power Cords
If you went to the store to buy a TV and one of the sets came without a plug on the end of the cord, what would your thoughts be? You can get away without plugs in some markets, but most customers expect a functioning product, not a do it yourself project. WOODS, RICHARD wrote: I can find nothing in IEC 950 nor EN 60950 that defines the requirements for an attachment plug for equipment that is not permanently connected. Due to the silence of the standard, I conclude that an attachment plug is not required per the standard. Therefore, it appears that the plug wiring methods and strain relief must be per the national standards and/or electrical codes of each country. For example, UL 1950 has a national deviation that specifies the need for a plug. I conclude that it is acceptable to CE mark a product that has no plug and allow a certified plug to be attached in any of the EU member states. CE marking compliance will not be affected. I conclude that it is acceptable to replace a plug on a CE marked product with a nationally acceptable plug without affecting CE marking compliance. I understand that the power cord must be acceptable for use in the target country. Therefore, it is not possible to ship a single attached power cord to Asia, Eastern Europe, Africa and South America since the power cord may not be legal in the target country even if a national plug is attached. Are my conclusions and understandings correct? - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: EN60950 - conduit entry dimensions
Jim, I took a few quick measurements of workboxes, isolation transformers, etc. in the lab, as well as the knockout openings in the cast housings of some of our flow transmitters. 7/8 and 1 1/8 seem to be the most common for the smaller circuits, with 2 3/8 and 2 3/4 used for the heavier stuff. Check a Hubbell catalog for required sizes for cable grips, etc. Scott Lacey -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Wednesday, October 06, 1999 5:49 PM To: 'EMC-PSTC - forum' Subject:RE: EN60950 - conduit entry dimensions I have received very little response to this one, so I thought I'd post it again. Aren't there any permanently connected ITE equipment mfr's on this forum?! What do you provide in the way of knockouts or ...??? Thanks, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -Original Message- From: Jim Eichner [SMTP:jeich...@statpower.com] Sent: Thursday, September 23, 1999 10:49 AM To: 'EMC-PSTC - forum' Subject: EN60950 - conduit entry dimensions Greetings all: In clause 3.2.2 allows the provision of knockouts, cable entries, etc. in lieu of a non-detachable power cord for permanently connected equipment. In Table 10, it lists the overall diameter of conduit based on the number of conductors involved, up to 16A. In my particular application, there are 2 wires plus earth, and the current (and the branch circuit protection) is less than 16A, so the table tells me I need a knockout that can accommodate a 16.0mm O.D. conduit. If things are done there anything like they are done here, this 16mm conduit will be secured in a fitting of some sort, and the knockout needs to be matched to the fitting, not the conduit (i.e. a 16mm hole is likely too small). Is there a reference, or can anyone tell me, what the appropriate sized hole will be? Is this standardized somewhere? Thanks in advance for your help, Jim Eichner Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com Any opinions expressed are those of my invisible friend, who really exists. Honest. - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
broadband narrowband emissions
Group, I'd like to have a clear definition of what are narrowband and broadband emissions. This question may seem very plain for many members of EMC-PSTC, but I always heard/saw this definition for emission and I still couldn't make them clear to me.. Thanks in advance for your attention Regards Muriel -- == Muriel Bittencourt de Liz GRUCAD - Group for Conception Analysis of Electromagnetic Devices Santa Catarina Federal University - UFSC PO Box: 476 ZIP: 88040-900 - Florianópolis - SC - BRAZIL Phone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 Alternativa Adreso: mur...@esperanto.nu - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Hot Surface. Hot air.
Dear Group Fellows I would like to raise the following two issues: 1) UL1950 / EN60950 Safety standards, Subclause 5.1 - Heating, Table 16 part 2, specify permissible temperature rise for external surfaces of equipment in Operator Access Area.. For external surfaces, made of metal which may be touched, it allows temperature rise of 45 degrees Kelvin, assuming ambient temperature of 25 degrees Celsius it allows surface temperature of 70 degrees Celsius = 158 degrees Fahrenheit ! Note (4) in this table applies to external surfaces that are not likely to be touched in normal use and measure less than 50 mm, in this case it allows a temperature rise of 75 degrees K, that under 25 degrees C ambient allows 100 degrees C = 212 degrees F !! Now, 70 degrees C for external equipment surface that may be touched seems pretty high to me. 100 degrees C metal surface will, I believe, cause a burn to that part of the human body that touched it. So maybe my interpretation is not true ??and, can someone point another regulatory source for Hot surface permissible temperature ? 2) Regarding Hot air flowing out of equipment, in UL1950 / EN60950 I could not find a requirement or limit for the maximum permissible temperature for it, Can someone point another regulatory source for Hot air permissible temperature ? Note: The equipment I relate to is ITE or Office, but information from Machinery standards or other sources is welcome ! Many Thanks Israel Yeshurun - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Removeable Module requirements
Equipment designed to the requirements of EN60439-1 requires that any removeable modules are only removeable with the use of a key or tool. That seems pretty well acceptable to me as we are protectingainst unintentional contact with potentially live parts. What if the modules are not locked in place but are covered by a door that is only opened with the use of a key (easy) or a tool (not so easy). Is this an acceptable alternative or do we need to provide 'infinite' barriers to prevent contact or is a 'lockable' door with warning labels acceptable? The only electrical device the user could contact behind the door are circuit breakers, there are no fuses etc. Any thoughts?, Thanks, Paul Excite -- Control Yourself. This E-mail brought to you by Excite's free E-mail service. Get your own E-mail address at http://www.excite.co.uk - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Luminaires standard for USA/CANADA countries
Hi all, We have some trouble , to find the UL and CSA equiv.alent standard of the EN 60598-1 for general requirements and tests of LUMINAIRES and similar. Do you can help me to fix the problem? Best regards. ing. Paolo Fini Italponti Telecomunicazioni via Reims 12, Firenze (ITALY) tel +39055689706 - fax +39055689706 www.italponti.it - paolof...@italponti.it
Risposta : Italy EMI/RFI Testing
You can contact any of the following: 1. CESI Via Rubattino, 54 Milan - tel. ++39.0221251 - fax ++39.022125510 2. IMQ Via Quintiliano, 43 - Milano - tel ++39.0250731 -fax ++39.025073271 3. NEMKO-ALFLAB Via Trento e Trieste, 116/118 Biassono (Milan) - tel. ++39.039220120 - fax ++39.0392753240 4. Prima Ricerca e Sviluppo Via Campagna, 58 Faloppio (Como) - tel +39.031991009 - fax +39.031991309 The first one is the best equipped. The second one has great experience with medical devices as they have been performing safety test (IEC 601-1 family) as well for dozens of years. Regards m.p. - ESAOTE S.p.A. Massimo Polignano Research Product Development Design Quality Control Via di Caciolle,15 tel:+39.055.4229402 I- 50127 Florence fax:+39.055.4223305 e-mail: massimo.polign...@esaote.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Coatings for Ferrite Tiles? (Magnetic Wallpaper)
Thanks for the details. Just in case you accidentally permanently affect your monitor ( like I did after playing with one of those really strong space magnets); use a cheap electric pencil sharpener to degauss your screen's metal mask when the power-on degausser isn't strong enough. You're right. I really panicked late at night 'til it dawned on me. - Robert - -Original Message- From: Price, Ed ed.pr...@cubic.com To: 'Ken Javor' ken.ja...@emccompliance.com; eric.lif...@ni.com eric.lif...@ni.com; emc-p...@majordomo.ieee.org emc-p...@majordomo.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Wednesday, October 06, 1999 8:48 PM Subject: RE: Coatings for Ferrite Tiles? (Magnetic Wallpaper) Ken Eric: I just measured two little sheet magnets using a Bell 4048 Gaussmeter (with DC peak hold function) and a Bell T4048 Transverse (Hall) probe (which looks like a little 0.05 square sensor chip on a stick). The first magnetic is a 1 diameter by 0.04 thick disc. Using moderate finger pressure to hold the probe flat to the rear surface, I measured a max field of 220 Gauss. The second magnet is a space shuttle image, about 2 long by 0.13 thick. The max field on this was 350 Gauss. Neither magnet is capable of causing a disturbance to my Dell monitor. Next, I took a 1/4 steel magnetic screwdriver tool holder (about 6 long), and put a 2 long hex bit into the female end (the end with the recessed magnet). If I hold this steel tool up to the center of my monitor screen, I can see a very distinct color bloom in the area near the magnet end. The affected area extends out about 4 on each side of the tool. And the meter says the max field adjacent to the tool is 690 Gauss. BTW, the monitor lets you visualize the magnetic field in a dramatic way. Next, I tried to catch the peak field from the degaussing function built into the monitor. Interestingly, I could see no more than 1 Gauss anywhere around the outside front edge of the monitor housing when I activated the degaussing coil. Ed - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Inductor
I've got some toroids sitting on the bench (about 2 inches in diameter) that would accomodate that with around 20 turns of doubled up 12 Awg wire. You need them? - Robert - -Original Message- From: Derek Walton l...@rols1.net To: emc-p...@ieee.org emc-p...@ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Wednesday, October 06, 1999 6:47 PM Subject: Inductor Hi folks, I need a low cost inductor with the following specifications: 100 microhenry, 30 amp max., operating frequency range 150 to 250 kHz max. The rest is open for grabs. An air-core, while cheap enough, is a little large. So I'm thinking about a few turns of heavy wire on a bar. Any suggestions of what this bar should be mad of? Thanks, Derek. -- Derek Walton Owner L. F. Research EMC Design and Test Facility 12790 Route 76, Poplar Grove, IL 61065. www.lfresearch.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Coatings for Ferrite Tiles? (Magnetic Wallpaper)
Ken Eric: I just measured two little sheet magnets using a Bell 4048 Gaussmeter (with DC peak hold function) and a Bell T4048 Transverse (Hall) probe (which looks like a little 0.05 square sensor chip on a stick). The first magnetic is a 1 diameter by 0.04 thick disc. Using moderate finger pressure to hold the probe flat to the rear surface, I measured a max field of 220 Gauss. The second magnet is a space shuttle image, about 2 long by 0.13 thick. The max field on this was 350 Gauss. Neither magnet is capable of causing a disturbance to my Dell monitor. Next, I took a 1/4 steel magnetic screwdriver tool holder (about 6 long), and put a 2 long hex bit into the female end (the end with the recessed magnet). If I hold this steel tool up to the center of my monitor screen, I can see a very distinct color bloom in the area near the magnet end. The affected area extends out about 4 on each side of the tool. And the meter says the max field adjacent to the tool is 690 Gauss. BTW, the monitor lets you visualize the magnetic field in a dramatic way. Next, I tried to catch the peak field from the degaussing function built into the monitor. Interestingly, I could see no more than 1 Gauss anywhere around the outside front edge of the monitor housing when I activated the degaussing coil. Ed -Original Message- From: Ken Javor [SMTP:ken.ja...@emccompliance.com] Sent: Wednesday, October 06, 1999 1:39 PM To: eric.lif...@ni.com; emc-p...@majordomo.ieee.org Subject: Re: Coatings for Ferrite Tiles? (Magnetic Wallpaper) On point 2, I will try to do the following simple test at EMC Compliance. I will take my DRG horn (1-18 GHz) and place it about one foot from my screen room wall. I will place a directional coupler between signal source and antenna, and measure forward/reverse power at 1 GHz. Then I will take the magnetic sheet, place it against the wall, and do it again. Difference in reverse power reading is absorption of sheet. If it works at all well, I will try same test at lower frequencies with a logperiodic. Any thoughts on this? -- From: eric.lif...@ni.com To: emc-p...@majordomo.ieee.org Subject: Re: Coatings for Ferrite Tiles? (Magnetic Wallpaper) Date: Wed, Oct 6, 1999, 11:00 AM Ken et al, I don't think these particular mag sheets evoke anywhere nearly so strong a magnetic field, I can't measure it here. But, I can put a strip of it over three different color video monitors in our lab and see absolutely no effect on color purity and no movement of pixels. The stuff seems designed to barely hold it's own weight, probably as a way to keep the cost down. And as the vendor told me, for materials it was less costly than the wallpaper they first considered. IMO the RF should penetrate the ferrite well enough that, over a prolonged exposure, it would slowly deguass the ferrite - strongest at least at the surface where the field first impinges on the ferrite. A better way might be to take our HP 6842 and have it drive a home-made deguassing coil at a couple kHz or so, generating a few Amps/meter and drag it over the ferrites. All I need now is a volunteer You might be right on point 2... A curious person with a TEM cell might want to write a paper on it. Eric To: Eric Lifsey/AUS/NIC@NIC, emc-p...@majordomo.ieee.org cc: Subject: Re: Coatings for Ferrite Tiles? (Magnetic Wallpaper) I don't know if the mag sheet would polarize/saturate the ferrite tile, but I have two questions: 1) If the tile were saturated and needed de-gaussing, how could a 1000-4-3 radiated field do this?. The magnetic field density associated with the peak of a 10 V/m field is about 1 mG. This is small compared to the hundreds of Gauss quoted earlier for the sheet magnetic field density. 2) If the magnetic strip doesn't detract from quiet zone uniformity when laid over the ferrite tile, and the magnetic strip is a homogeneous magnetic material, is it just possible that the strip material itself acts as absorber... -- From: eric.lif...@ni.com To: emc-p...@majordomo.ieee.org Subject: RE: Coatings for Ferrite Tiles? (Magnetic Wallpaper) Date: Tue, Oct 5, 1999, 2:36 PM Ed et al, Me too! The folks selling/installing our 3 meter chamber put the mag sheets in before running the 16 point field cal. The chamber's main purpose is for -3, -6, and the occasional -8. It's just under 3 meters tall, so it can't serve for bonafide emission testing, just debug work. My first question about the mag sheets was whether the static mag field would cause the ferrites to gradually polarize over time, moving them up the saturation curve. The vendor said they've used the material before on larger chambers with no apparent problems. I suspect that the RF field test likely serves as a demagnetizer to some extent, keeping saturation
Inductor
Hi folks, I need a low cost inductor with the following specifications: 100 microhenry, 30 amp max., operating frequency range 150 to 250 kHz max. The rest is open for grabs. An air-core, while cheap enough, is a little large. So I'm thinking about a few turns of heavy wire on a bar. Any suggestions of what this bar should be mad of? Thanks, Derek. -- Derek Walton Owner L. F. Research EMC Design and Test Facility 12790 Route 76, Poplar Grove, IL 61065. www.lfresearch.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: EN60950 - conduit entry dimensions
Hi Jim: Aren't there any permanently connected ITE equipment mfr's on this forum?! What do you provide in the way of knockouts or ...??? I don't have any first-hand experience... but... On good authority, a major mainframe manufacturer uses cord-and-plug connection for EVERYTHING! The plug is one from the IEC 309 series of industrial plugs. No permanent connections. Why not use an IEC 309 plug and appropriate cord? (I believe these plugs and sockets are readily available from USA industrial plug manufacturers.) Best regards, Rich - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
