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Measuring line noise and power conditioners

I recently purchased a Trifield EMI (Dirty Electricity) Line Meter to measure noise coming from my outlets. To my surprise, my $500 power conditioner (name withheld to protect the potentially innocent) appears to not filter any noise per the Trifield readings. In fact, with some of my outlets the measures are higher through the conditioner’s outlets, than the measures coming straight out of the wall. The manufacturer denies anything is wrong with their conditioner, claiming the Trifield is measuring the wrong frequencies. Can anyone explain?

output555

Showing 3 responses by three_easy_payments

three_easy_payments's avatar
three_easy_payments
2,097 posts
 
@erik_squires 

You are measuring starting at 20 kHz and going up. That is, these devices START measuring noise at the upper limit of human hearing.

It's hard to imagine noise on your line only affecting one portion of the frequency range.  So in other words if you reduced noise that's being measured above 20khz why wouldn't you expect that same filtering to affect the entire range even in areas that aren't being measured by the meter?  Do they make current filters that reduce noise between 100hz and 1Khz??? (for example)  That makes zero sense to me.


three_easy_payments's avatar
three_easy_payments
2,097 posts
 
I guess I never thought that hash on the AC line was associated with any frequency....I assumed it was an equal opportunity offender of all frequencies regardless of where you were measuring the dB reduction.
three_easy_payments's avatar
three_easy_payments
2,097 posts
 
@slaw Do you like your Alpha Labs meter?  Been thinking about picking one up.
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