I found something interesting today. While measuring leakage current with a
digital multimeter, I noticed a high amount of leakage. The unit
incorporates a switching power supply, with some EMI/EMC circuitry. Anyhow,
I read somewhere that DMMs are some times inaccurate with high frequency
line conducted emissions. Took a old Simpson analog meter (took forever to
figure it out, since I've never touched a analog meter hehehe) and found
measurements that were rather low. The questions is, I'm wondering if UL or
for that matter, any other testing agency actually know about this fact, or
merely fail their clients with incorrect data.
Any input on this subject would be appreciated.
Ken
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