question on measuring bonding impedance
Is there a standard method for measuring AC bonding impedances for electrical bonding? Thanks in advance, Susan Beard --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: question on measuring bonding impedance
RE: question on measuring bonding impedanceMike, A weld occurs when there is melting of metal. The metal will only melt if it gets enough heat. It will only get enough heat if there is enough of a resistance there (P=IR), or an arc (where the arc-welder gets its name), either of which would mean poor bonding, a failure of the test. A good bond won't be warm to the touch (wait until the current is off before testing my theory) BTW, the connection tested in 1010, 60950 and many other safety standards is the path to ground, which, in a fault, may have to withstand xx amps until the fuse blows or the circuit breaker trips. Even though my experience comes from my past few employers, my opinions are my own. --- Sam Davis Regulatory Engineer Professional Testing Inc. (512)244-3371 x112 www.ptitest.com -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Michael Taylor Sent: Monday, April 15, 2002 2:02 PM To: 'Ken Javor'; Robert Wilson; shbe...@rockwellcollins.com; emc-p...@ieee.org Subject: RE: question on measuring bonding impedance I promised myself I was not going to drag out my soap box and jump into this but . . .! (this discussion is limited to only the issue of the measurement of bond impedance - not if the connection can stand xx amps) While MIL 5087 establishes some bonding requirements methods, for domestic product safety EN-61010 Sect 6.5.1 requires 25Amps (DC or ACrms) or 2x the fuse rating. I have never liked this method of testing. Does it make any sense to test the impedance of a connection by welding it ??? Any of the low voltage (low current) ac bridge or Kelvin methods will tell you the actual impedance of the joint. Or, it will tell you that an oxide layer exists in the bond at that test potential (stress) level. The oxide layer may only be angstroms thick and require a few nanovolts potential difference to punch through, but you know what it really is. Not, what the welded connection has become. The impedance and the area of the bond determine the current carrying capacity. If proper testing indicates an oxide layer problem then it can be dealt with mechanical means to establish a gas tight connection or with the introduction of a conductive compound. Bell Labs developed the best conductive compound I have ever come across, called NO-OX. Developed to produce a 20 year stable ultra-low Z connection on the DC battery buss bars in telephone switching centers It's exact composition is unknown but I think it includes reconstituted catfish pond sludge (or some equally fowl compound). I remain a firm proponent of finesse not nuke um see what's left although the 1010 standard forces me to do the high amperage test. I do it but I don't like it. I'll put my soapbox away now, it's time for the people in white coats to return me to the home. Regards, Michael Taylor (thawing out in Colorado) -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Monday, April 15, 2002 11:44 AM To: Robert Wilson; shbe...@rockwellcollins.com; emc-p...@ieee.org Subject: Re: question on measuring bonding impedance I wasn't going to respond to this one because I know of no standard, and I don't know what you mean by AC, power frequency or rf. But HP/Agilent makes/used to make a bond meter with a 1 kHz signal. The purpose was partly to offset the effects of galvanic potentials: an ac measurement cancles the dc galvanic potential out. -- From: Robert Wilson robert_wil...@tirsys.com To: shbe...@rockwellcollins.com, emc-p...@ieee.org Subject: RE: question on measuring bonding impedance Date: Mon, Apr 15, 2002, 10:46 AM How about the usual method of determining the value of very low resistances and impedances? Pass a known (relatively high) AC current through the connection, measure the voltage drop and use Ohm's law to calculate the resistance (and this is, after all, an essentially resistive connection). Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: shbe...@rockwellcollins.com [mailto:shbe...@rockwellcollins.com] Sent: April 15, 2002 4:49 AM To: emc-p...@ieee.org Subject: question on measuring bonding impedance Is there a standard method for measuring AC bonding impedances for electrical bonding? Thanks in advance, Susan Beard --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com
Re: question on measuring bonding impedance
I read in !emc-pstc that Michael Taylor mtay...@hach.com wrote (in da60a3b237698944981e58ebf28d76d03de...@iris.lvl.hach.com) about 'question on measuring bonding impedance', on Mon, 15 Apr 2002: for domestic product safety EN-61010 Sect 6.5.1 requires 25Amps (DC or ACrms) or 2x the fuse rating. I have never liked this method of testing. Well, EN61010 is certainly not for domestic products, that's EN60335-1, but most of the standards call up a similar test. For safety purposes, it's appropriate, because the test is intended to find out if the protective device will operate in the event of an overcurrent fault. The voltage source driving the earth fault current may, in Europe, be as high as 50 V, but there may be some voltage drop in the fault circuit, so that the joint sees no more that a few volts, hence the limited source voltage for the test, usually 12 V. A 'dry circuit' test may be appropriate for some purposes, but for safety purposes, the existing test is apt. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: question on measuring bonding impedance
I read in !emc-pstc that Robert Wilson robert_wil...@tirsys.com wrote (in 3FF57405336C9B4C976A1819F860A2560F6966@xng_tirsys.TIRSYS.COM) about 'question on measuring bonding impedance', on Mon, 15 Apr 2002: How about the usual method of determining the value of very low resistances and impedances? Pass a known (relatively high) AC current through the connection, measure the voltage drop and use Ohm's law to calculate the resistance (and this is, after all, an essentially resistive connection). This is indeed one standard method, often called 'the millivolt-drop method'. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: question on measuring bonding impedance
Susan, I'm not sure what AC means in your message below. I'm assuming that you mean in the radio frequency range, where low bonding impedance across joints means good shielding effectiveness. There is an SAE standard for measuring the transfer impedance across EMI shielding gaskets: SAE-ARP-1705. I personally have never seen the actual standard. I have only seen it quoted as a reference document on spec sheets for EMC gaskets. Is this the type of information that you're looking for? Perhaps those more familiar can comment? If you are dealing with lower frequency AC such as 60Hz, 1Khz... I have already seen some replies that provide some decent guidance on how to perform this measurement. Best Regards Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | -Original Message- From: shbe...@rockwellcollins.com [mailto:shbe...@rockwellcollins.com] Sent: April 15, 2002 4:49 AM To: emc-p...@ieee.org Subject: question on measuring bonding impedance Is there a standard method for measuring AC bonding impedances for electrical bonding? Thanks in advance, Susan Beard --- --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: IEC/EN 61010-1:2001 - Dielectric Strength Testing Question ( another)
Hi Folks My turn to ask some questions as a newcomer to this version of the standard: 1 Dielectric Strength Testing to Clause 6.8.4 Voltage tests Table 9 Test voltages for BASIC INSULATION. Can anyone confirm my suspicion that there may be a misprint in Column 1 Clearance of Table 9 , as follows: The line entry between 1.0 and 2.0 is 1.4 - should this not be 1.5 (mm)? That it should be so appears (to me at least!) to be fairly obvious from Table 8 Clearance for measurement categories II, III and IV where 1.5 (mm) is mentioned in numerous places but 1.4 is not mentioned at all. Apart from anything else, 1.5mm is the category II minimum value for nominal line voltages of 150V=300V - which will be the mimimum value for a very large amount of equipment. Otherwise, the majority of users of the standard will have to start out by interpolating in Table 9 - which is not very clever to say the least, as mistakes may well occur! Therefore, even if I am wrong about the need for the 1.4 entry, I think that the test voltages for 1.5mm should be given as well. 2 This relates to another (this time probable) misprint in Fig 5 Flow chart to explain the requirements for protection against the spread of fire. On the right hand side of the diagram (At least in my copy) there appear to be arrows missing between the boxes for i) Construction requirements for components 9.2.1 a) and ENCLOSURE requirements 9.2.1 b) and (ii) between ENCLOSURE requirements 9.2.1 b) and Requirements for flammable liquids 9.4 c), d) or e). (Obvious I know, but this should not have happened with an important recent standard). 3 Finally, the Flow chart symbols in this diagram do not appear to conform to some generally accepted principles, i.e should there not be decision (OR) box symbols where alternative routes are available (e.g. as in Fig 10) ? Comments please - and maybe some corrections to the standard if I am correct. John Allen (Ex Thales Defence - but now thankfully with another job after being made redundant!) PS Has anyone checked the OTHER entries in Table 9? The one above seems wrong, and thus there could be other very errors which could significantly affect the pass/failure of equipment under test due to testing at incorrect voltages.
RE: question on measuring bonding impedance
I promised myself I was not going to drag out my soap box and jump into this but . . .! (this discussion is limited to only the issue of the measurement of bond impedance - not if the connection can stand xx amps) While MIL 5087 establishes some bonding requirements methods, for domestic product safety EN-61010 Sect 6.5.1 requires 25Amps (DC or ACrms) or 2x the fuse rating. I have never liked this method of testing. Does it make any sense to test the impedance of a connection by welding it ??? Any of the low voltage (low current) ac bridge or Kelvin methods will tell you the actual impedance of the joint. Or, it will tell you that an oxide layer exists in the bond at that test potential (stress) level. The oxide layer may only be angstroms thick and require a few nanovolts potential difference to punch through, but you know what it really is. Not, what the welded connection has become. The impedance and the area of the bond determine the current carrying capacity. If proper testing indicates an oxide layer problem then it can be dealt with mechanical means to establish a gas tight connection or with the introduction of a conductive compound. Bell Labs developed the best conductive compound I have ever come across, called NO-OX. Developed to produce a 20 year stable ultra-low Z connection on the DC battery buss bars in telephone switching centers It's exact composition is unknown but I think it includes reconstituted catfish pond sludge (or some equally fowl compound). I remain a firm proponent of finesse not nuke um see what's left although the 1010 standard forces me to do the high amperage test. I do it but I don't like it. I'll put my soapbox away now, it's time for the people in white coats to return me to the home. Regards, Michael Taylor (thawing out in Colorado) -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Monday, April 15, 2002 11:44 AM To: Robert Wilson; shbe...@rockwellcollins.com; emc-p...@ieee.org Subject: Re: question on measuring bonding impedance I wasn't going to respond to this one because I know of no standard, and I don't know what you mean by AC, power frequency or rf. But HP/Agilent makes/used to make a bond meter with a 1 kHz signal. The purpose was partly to offset the effects of galvanic potentials: an ac measurement cancles the dc galvanic potential out. -- From: Robert Wilson robert_wil...@tirsys.com To: shbe...@rockwellcollins.com, emc-p...@ieee.org Subject: RE: question on measuring bonding impedance Date: Mon, Apr 15, 2002, 10:46 AM How about the usual method of determining the value of very low resistances and impedances? Pass a known (relatively high) AC current through the connection, measure the voltage drop and use Ohm's law to calculate the resistance (and this is, after all, an essentially resistive connection). Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: shbe...@rockwellcollins.com [mailto:shbe...@rockwellcollins.com] Sent: April 15, 2002 4:49 AM To: emc-p...@ieee.org Subject: question on measuring bonding impedance Is there a standard method for measuring AC bonding impedances for electrical bonding? Thanks in advance, Susan Beard --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at:
Re: question on measuring bonding impedance
I wasn't going to respond to this one because I know of no standard, and I don't know what you mean by AC, power frequency or rf. But HP/Agilent makes/used to make a bond meter with a 1 kHz signal. The purpose was partly to offset the effects of galvanic potentials: an ac measurement cancles the dc galvanic potential out. -- From: Robert Wilson robert_wil...@tirsys.com To: shbe...@rockwellcollins.com, emc-p...@ieee.org Subject: RE: question on measuring bonding impedance Date: Mon, Apr 15, 2002, 10:46 AM How about the usual method of determining the value of very low resistances and impedances? Pass a known (relatively high) AC current through the connection, measure the voltage drop and use Ohm's law to calculate the resistance (and this is, after all, an essentially resistive connection). Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: shbe...@rockwellcollins.com [mailto:shbe...@rockwellcollins.com] Sent: April 15, 2002 4:49 AM To: emc-p...@ieee.org Subject: question on measuring bonding impedance Is there a standard method for measuring AC bonding impedances for electrical bonding? Thanks in advance, Susan Beard --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Calibration Tracking Software
We use a package called GAGEtrack, produced by the CyberMetrics Corporation. www.visit.com Good if you have a large number of items to track and control. If you only have a limited number, Excel is a very good tool. Andrew Carson - Senior Compliance Engineer, Xyratex, UK Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 -Original Message- From: richwo...@tycoint.com [mailto:richwo...@tycoint.com] Sent: 15 April 2002 15:37 To: emc-p...@ieee.org Subject: RE: Calibration Tracking Software Mike, we use Excel and include the following data: Model Description Serial number Manufacturer Last cal date Due cal date Calibration lab Cal cost Richard Woods Sensormatic Electronics Tyco International -Original Message- From: Mike Stone [mailto:mst...@lsr.com] Sent: Monday, April 15, 2002 8:22 AM To: EMC-PSTC (E-mail) Subject: Calibration Tracking Software Good Morning, I have been looking for a reasonably priced (cheap) software program to track and produce status reports for our calibrated equipment. Does anyone have any suggestions? Thank you in advance. Regards, Michael Stone L. S. Compliance Inc. W66 N220 Commerce Court Cedarburg, WI 53012 262-375-4400 Ext. 128 mst...@lsr.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Criteria for UL V0 plastic enclosure
Hi Scott: In the case of LPS, wouldn't the plastic enclosure still be considered decorative plastic outside a fire enclosure and required to meet HB flame class (per UL 60950, 4.7.3.3)? Yes. Virtually all plastic materials meet the HB flame class, hence my comment that he may use any plastic. Best regards, Rich Rich Nute wrote: The choice is yours. If your product is supplied by a Limited Power Source, then you may use any plastic for the enclosure. If your product is not supplied by a Limited Power Source, then you must use V1 or better plastic for --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Calibration Tracking Software
Mike, we use Excel and include the following data: Model Description Serial number Manufacturer Last cal date Due cal date Calibration lab Cal cost Richard Woods Sensormatic Electronics Tyco International -Original Message- From: Mike Stone [mailto:mst...@lsr.com] Sent: Monday, April 15, 2002 8:22 AM To: EMC-PSTC (E-mail) Subject: Calibration Tracking Software Good Morning, I have been looking for a reasonably priced (cheap) software program to track and produce status reports for our calibrated equipment. Does anyone have any suggestions? Thank you in advance. Regards, Michael Stone L. S. Compliance Inc. W66 N220 Commerce Court Cedarburg, WI 53012 262-375-4400 Ext. 128 mst...@lsr.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Criteria for UL V0 plastic enclosure
Hello Rich, In the case of LPS, wouldn't the plastic enclosure still be considered decorative plastic outside a fire enclosure and required to meet HB flame class (per UL 60950, 4.7.3.3)? Regards, Scott Rich Nute wrote: The choice is yours. If your product is supplied by a Limited Power Source, then you may use any plastic for the enclosure. If your product is not supplied by a Limited Power Source, then you must use V1 or better plastic for --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Calibration Tracking Software
Good Morning, I have been looking for a reasonably priced (cheap) software program to track and produce status reports for our calibrated equipment. Does anyone have any suggestions? Thank you in advance. Regards, Michael Stone L. S. Compliance Inc. W66 N220 Commerce Court Cedarburg, WI 53012 262-375-4400 Ext. 128 mst...@lsr.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Measuring Instruments Directive
Dear Nick There are a number of useful links on the draft MID on our website A HREF=http://www.cherryclough.com; www.cherryclough.com/A under Useful links to EU directives (or go directly to: A HREF=http://www.cherryclough.com/usefullinks1/index.html;http://www.cherryclough.com/usefullinks1/index.html/A). We haven't rechecked these links recently, so some of them may have rotted. Also, we have a brief introduction to the provisions of the draft MID (and many other directives) plus the same links in our downloadable introduction to EU Directives under Lists of EU Directives (or go directly to: A HREF=http://www.cherryclough.com/nss-folder/eudirectives/; http://www.cherryclough.com/nss-folder/eudirectives//A). All the very best! Keith Armstrong In a message dated 12/04/02 17:54:01 GMT Daylight Time, ni...@tsd.serco.com writes: Subj:Measuring Instruments Directive Date:12/04/02 17:54:01 GMT Daylight Time From:A HREF=mailto:ni...@tsd.serco.com;ni...@tsd.serco.com/A To:A HREF=mailto:emc-p...@majordomo.ieee.org;emc-p...@majordomo.ieee.org/A Sent from the Internet I have come across some information on the web specifically to do with electricity and gas meters that infers that a new directive called the Measuring Instruments Directive is about to come into force. I have searched the Europa website for information on this but can not find any. Does anyone have any info or ideas on this? Thanks Nick Martin
