@venpick said:
Well I wished I would have searched here first. I just learned this same lesson. i found an EMI tester on ebay and thought it would be a great tool to own. Turns out i got exactly the same kind of results as you.
Around 70mv noise directly from my outlet. Then I connected my well known company power conditioner/power supply surge protector yada yada and now it measures 170mv noise.
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Around 70mv noise directly from my outlet.
No load connected. Correct?
EMI = electromagnetic Interference. Correct?
If there is not any load connected to the outlet there will only be an electric field. Correct? No load no current. No current no magnetic field. Correct? No EM field.
Add small load, small EM field. Add large load, large EM field. Higher reading...
Plug in a table lamp with a regular filament incandescent bulb. What does the meter measure? The incandescent bulb is a pure resistive load. EM field yes. EMI? I don’t think so.
Food for thought, without an EM field nothing electrical will work. Light bulb won’t light. Motor shaft won’t turn.
Jim