Re: Ce versus FCC

1998-07-07 Thread MVA850SS
Obviously it is not the logic circuits I am refering to! The front end of the power supply has many types of scenarios that can cause high (30 MHz) frequency emissions. To name a few. Switcher pulse risetime and fall-off. As semiconductors get better adn smaller, their ft also better (to other

Re: Ce versus FCC

1998-07-07 Thread Lfresearch
In a message dated 98-07-06 20:40:33 EDT, rbus...@es.com writes: A test house explained to me that the FCC allows either CISPR or FCC limits/procedures providing that one can determine worst case. Consequently, you have to test both ways (120 V 60Hz or 230V 50Hz) to determine which way you

RE: Ce versus FCC

1998-07-07 Thread Richardson, William G
; dwight.hunnic...@vina-tech.com; emc-p...@ieee.org Cc: eric.lif...@natinst.com Subject: RE: Ce versus FCC That's interesting. The change from 50 to 60 Hz would change some input components and that could effect the input impedance and hence the conducted emissions signature

RE: Ce versus FCC

1998-07-07 Thread Upson,Darrell
Your comment below is absolutely true. Manufacturers spend far too much time and money obtaining certifications for so many countries that have just minor differences in their standards. One standard for EMC/product safety is too simple I guess. Darrell -- From:

Re: Ce versus FCC

1998-07-07 Thread Dwight Hunnicutt
-tech.com; emc-p...@ieee.org Cc: eric.lif...@natinst.com Subject:Re: Ce versus FCC I have encountered certain European agencies requesting that not only are the conducted emissions required to be performed at 230V 50Hz but radiated emissions

RE: Ce versus FCC

1998-07-07 Thread Gary McInturff
To: dwight.hunnic...@vina-tech.com; emc-p...@ieee.org Cc: eric.lif...@natinst.com Subject:Re: Ce versus FCC I have encountered certain European agencies requesting that not only are the conducted emissions required to be performed at 230V 50Hz

Re: Ce versus FCC

1998-07-07 Thread Lfresearch
Dwight, While pursuing a TCF route, this was discussed at length with our CB. The frequency was of secondary concern to the line voltage. We tested with both frequencies anyway because we can: it made no discernable difference to our emission or immunity data.. Best regards, Derek Walton

Re: CE versus FCC

1998-07-06 Thread Keith Armstrong
Thanks, Derek These are all good examples of problems everyone can relate to. A good domestic one from a colleague of mine recently was that when he walked near a bathroom in his house while carrying his (FCC Class B) laptop computer switched on (- he is a workaholic), and if someone was bathing

Re: Ce versus FCC

1998-07-06 Thread CTL
PSTC emc-p...@ieee.org Cc: eric.lif...@natinst.com eric.lif...@natinst.com List-Post: emc-pstc@listserv.ieee.org Date: Monday, July 06, 1998 4:45 PM Subject: Re: Ce versus FCC Eric- You tossed in one line that brings up a parallel question for Europe: Note that the FCC expects conducted

Re: Ce versus FCC

1998-07-06 Thread HMellberg
I have encountered certain European agencies requesting that not only are the conducted emissions required to be performed at 230V 50Hz but radiated emissions as well. I agree that for conducted emissions it may make a difference but I have not seen radiated emissions change when the power source

Re: Ce versus FCC

1998-07-06 Thread Dwight Hunnicutt
Eric- You tossed in one line that brings up a parallel question for Europe: Note that the FCC expects conducted emissions to be measured at 115 VAC, 60 Hz. Has your experience indicated that all Euro EMC directive (emissions/immunity) testing be conducted at 50Hz? Many local EMC labs do not

Re: CE versus FCC

1998-07-06 Thread Lfresearch
Keith, with over 18 years in EMC I could go on a long time. Some examples this year already... My computer ( FCC Class B ) interferes with my cordless phones, to some degree on all 10 channels. My FAX machine ( FCC Class B ) interferes with my TV and some channels of my cordless phones.

Re: CE versus FCC

1998-07-05 Thread Keith Armstrong
Dear Derek and Brian If you (or anyone else) have any examples of things that didn't work well together for reasons of lack of adequate EMC I'd be pleased to have some details of them. Also of things that didn't work well because of their electromagnetic environment. E.g just recently I heard two

Re: CE versus FCC

1998-07-04 Thread Lfresearch
Brian, here is the US the manufacturer has is easy... But many things we buy don't work well together! Derek.

Re: Ce versus FCC

1998-07-03 Thread John Harrington
Eric Top answer! Regards John Harrington EMC Group Manager, KTL Telephone : +44 (0) 1482 801801 Fax : +44 (0) 1482 801806 email : jharring...@ktl.co.uk

RE: Ce versus FCC

1998-07-03 Thread Rostek, Paul
To: eric.lif...@natinst.com Sent: Thursday, July 02, 1998 1:08 PM To: Brian Harlowe Cc: emc-p...@ieee.org Subject: Re: Ce versus FCC The FCC has the authority to mandate immunity for Part-15 devices, but has declined to do so. The exception is for consumer telephones

RE: Ce versus FCC

1998-07-02 Thread Mike Hopkins
Hard to do in simple words but: FCC -- many emissions requirements for digital products; lightning immunity requirements for telecom (part 68). EEC EMC Directive -- both emissions an immunity requirements; specifics depend on the product. Suggest you look at a couple of these web pages to get

Re: Ce versus FCC

1998-07-02 Thread ron_pickard
Brian, Here's the differences in a small nutshell: FCC CE Radiated Emissions x x Conducted Emissions x x Immunity x There are differences in frequency and emission

RE: Ce versus FCC

1998-07-02 Thread Bogdan Matoga
Sorry, George, I beg to differ and to offer my two bits: 47CFR (Oct. 1, 1997) Para. 15.5 (b) states: Operation of an intentional, unintentional, or incidental radiator is subject to the conditions that no harmful interference is caused and that INTERFERENCE MUST BE ACCEPTED that may be caused by

Re: Ce versus FCC

1998-07-02 Thread eric . lifsey
The FCC has the authority to mandate immunity for Part-15 devices, but has declined to do so. The exception is for consumer telephones and other telephone equipment under FCC Part-68 rules. But in general, noise immunity is practically unregulated in the USA. The FCC expects industry to