Re: LED Color

Depends a lot on the application, region and where on the equipment. For example, for machinery, if the LEDs are part of the operator interface or machine-mounted control device, both EN 60204-1 (IEC 60204-1) and ANSI/NFPA 79 have specific requirements for INDICATOR LIGHTS in general (not

RE: Part 15 section numbering

The odd numbering is not unique to Part 15. All of 47 CFR chapters has their sub-parts originally designated with an odd number. The even numbers, where they exist, are the result of additions and it was necessary to put them in between the odd sub-parts. John Shinn, P.E. Manager, Lab

RE: ( More) Laser Safety Questions

Doug - I was in no way implying the flaw was yours. The flaw lies in the practical implementation of the system. Peter -Original Message- From: Massey, Doug C. [mailto:masse...@ems-t.com] Sent: Thursday, March 21, 2002 10:40 AM Peter - I humbly submit that there is no 'flaw' in

U.S. Safety Regulations

There seems to be some confusion regarding U.S. product safety regulations. It is not as complicated as some have made it appear. I will try to simplify this topic. First, the European Directives may be EU law, but they are only directed to member states, not manufacturers, over which they

Re: GROUND LIFTS, oh boy.....

Dear Ted Your description of ground-loop prevention methods is very comprehensive, and reminds me strongly of the years I spent designing consoles for Neve in the 70's - 80's. Thank you very much for sharing this useful information with us. These days most of my involvement with pro-audio is

LED Color

Hi all, Does anybody know any standard or guideline regarding the colors used in LED displays? Usual applications commonly apply green for ON and red for OFF, but I would like to know if there is any national / international standard that specifies the LED color according to the fuction that

Re: Pro-audio and ground lifting

Dear Mike I'm sure professionals like yourself wouldn't dream of ever cutting a safety ground. Yet it does happen in pro-audio and video installations, even sometimes in the Albert Hall in London at black tie concerts. I know the US doesn't have laws equivalent to Europe's LVD, but I didn't

Re: Pro-audio and ground lifting

Dear Ken Thank you for your reply. I am sure that most installers know what they are supposed to do for electrical safety, but some seem very ready to cut safety corners when hum appears in the audio signal. This is a worldwide problem in pro-audio installations, of course, not a specifically

RE: NEC Question

Hi gang: I have seen this thread more than once on this forum, regarding the fabled OSHA rule, CFR29 sec. 1910.399 as a basis to propose that ITE product safety in the US is a matter of legislation rather than litigation. It sounds great on the surface, but let's dig a little deeper. 29CFR sec.

RE: ( More) Laser Safety Questions

Peter - I humbly submit that there is no 'flaw' in reminding folks that audits do happen and that they may be subject to one, however rare they may be. I don't argue that the agency is understaffed and overworked, and is more concerned with laser light shows and medical device lasers than with

RE: IP Rating and EN60950

Hi Rich - Annex T of EN60950 refers to EN60529. Dust ingress is not considered. EN60950 clause 1.1.2 refers to Annex T. One thing to note - if you're designing for global use, UL60950 does not accept EN60529 testing - it must be UL50 tested. Which is, IMHO, overkill in many cases since UL50 is

FW: Part 15 section numbering

All, I contacted the FCC with regard to Part 15 and only the odd numbered sections. Apparently that's the way it was numbered. Here's the response from FCC. GE Interlogix John A. Juhasz Product Qualification Compliance Engr. Fiber Options Div. 80 Orville Dr. Suite 102, Bohemia, NY 11716

RE: SND/ND ratio

Richard, Signal + Noise + Distortion/Signal + Distortion, (I guess) Tony Firth, Genus, Inc, Sunnyvale,CA -Original Message- The term SND/ND ratio is used in ETSI EN 300 220-1 as one of the performance criteria for receivers. Can someone tell me what this term means? Richard Woods

RE: SND/ND ratio

Could this be a weird abbreviation for Signal to Noise ratio? Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: richwo...@tycoint.com [mailto:richwo...@tycoint.com] Sent: March 21, 2002 7:29 AM To: emc-p...@majordomo.ieee.org Subject: SND/ND ratio The term SND/ND ratio

March, 2002 EMC/Telco/Product Safety Update Now Available

The Curtis-Straus Update for March, 2002 is now available at: http://www.conformity-update.com The headlines are: EU Publishes New Standards For EMC, LVD and RTTE Directives. Fight Brewing Over UWB Technology. EU Publishes Revamped Directive On General Product Safety. EU Clarifies Scope Of

Test Equipment for NEMA TS 2

Can anyone direct me to a seller or renter of test equipment for the testing to NEMA TS 2? Thank you, Bob Heller 3M Product Safety, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 --- This message is from the IEEE EMC Society

RE: SND/ND ratio

This term means the ratio : (signal+noise+distortion) / (noise+distortion) A measure of difference between wanted signal+inherent noise and distortion (always present)and unwanted noise and distortion Regards Mark Render EMC and Radio Group Manager KTL Saxon Way Priory Park West Hessle

What standards reference the insertion force for a PCB into a card cage?

Folks Are there any specifications in any EU Directive, or other standards governing how much manual force is required to insert a PCB into a card cage? If not, are there any specifications from any standard that determines how much horizontal force an operator can be expected to exert? This

SND/ND ratio

The term SND/ND ratio is used in ETSI EN 300 220-1 as one of the performance criteria for receivers. Can someone tell me what this term means? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product

Thermoelectric Active Cooling for PC Cards

We have a thermoelectric active cooling for PC Cards mounted on a PCI Card. The card is powered from the Mains (100-240VAC) and distributes DC voltages for the various functions on board. Is this product regulated in Japan and Taiwan and if so, what are the requirements for safety/emc/other?

RE: product modifications by the end user

Thank you for the many replies on this topic, as usual this forum has come up trumps. I managed to compose a memo that persuaded our people that modification kits should only be supplied to suitably qualified distributors. Cheers Chris Colgan Compliance Engineer TAG McLaren Audio Ltd The

SV: Surge test on a loop

We will apply EN50130-4. It seems that we need an extra 20m shielded cable when testing on of the EUTs. That we swap the 20m to the next EUT. This 20m shielded cable, is it used to obtain capacitive coupling between the shield and the lines ? Amund -Opprinnelig melding- Fra:

GROUND LIFTS, oh boy.....

It is unfortunately the case that it is easy to create a sound system having mediocre performance using ready-made audio cables with shields connected at both ends. The technical knowledge required to install a system that performs correctly and is safe is available, at a cost, and that is

Re: Pro-audio and ground lifting

I read in !emc-pstc that Chris Maxwell chris.maxw...@nettest.com wrote (in 83d652574e7af740873674f9fc12dbaaf7e...@utexh1w2.gnnettest.com) about 'Pro-audio and ground lifting', on Wed, 20 Mar 2002: I have a feeling that hum could be solved by power filtering without disconnecting grounds; the

Re: Pro-audio and ground lifting

I read in !emc-pstc that Ted Rook t...@crestaudio.com wrote (in sc9895ff@peavey.com) about 'Pro-audio and ground lifting', on Wed, 20 Mar 2002: Ground lift switches do not affect the protective ground electrical connection between the AC third wire and the equipment chassis. The trouble is