RE: EMC Emissions vs EFT warning!

Alex, If ever the RJ cable between your unit A an B carries control or data signals that do not have a dedicated current return in addition to the power and ground lines, it may be possible that adding a CMC on the power and ground lines alone may have broken the ground return path for these sign

Re: digital devices

If you meant more than 9000 cycles per second, yes, that would be classified as a digital device under FCC Part 15. SMPS are not likely to switch at that frequency. More typically, they switch at rates above 30 kHz, well beyond audio frequencies. -- --

RE: digital devices

Yes, a switchmode power supply falls under FCC part 15. Also, if by "timing signals" you are referring to its switching frequency, I think you have lost a "zero" somewhere. No switchmode power supply operates in the audible frequency range around 9KHz or 10KHz (especially one used to operate a spe

EMC Emissions vs EFT warning!

Hi Group, I am working on a small Class II product (A) i.e. no earth. The product is powered by 12Vdc via a 1M cable with RJ type connections from another similar Class II product (B) which itself is powered via an external in-line AC/AC power block (basically an AC/ac transformer) and rectified

SV: Accreditation - testing ourselves

Hi Dave >However, if they had not made provisions in their QA manual for use by non lab personnel they would be in >violation of there own procedures and subject to audit findings by the lab accrediting body. Agree >They may be hiding behind the accreditation as a graceful way of stopping a p

digital devices

Hi all I have an active loudspeaker which have been using a traditional power supply, but will now be using switch mode power supply. Until now it have not been under FCC part 15 and ICES 003, as fare as I understand. Is a switch mode power supply regarded as a digital device according to FCC par

How to meassure/define the radiated disturbances of Microwave-Oven?

Dear all: Can anyone tell me about how to meassure/define the radiated disturbances of Microwave-Oven according to CISPR 11 and 19? In CISPR19: 1983, the substitution method was introduced to measure the effective radiated power per limit for radiated power 57dB(pW) from CISPR 11: 1990 in fre