Home Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: Well I tried an experiment

Sounds good!

I seem to get a 6-12 dB reduction in noise level. Just guessing, but I wonder how I would measure this with a scope??



You can easily check for the proper polarity orientation with a multimeter.

1) Disconnect all ICs from the inputs of the piece of equipment to be tested.
Equipment safety ground must also be lifted from the piece of equipment. As you did with the ground cheater.)

2) Set the multimeter to auto AC volts or a range above 125V (USA or Canada)

3) Power up the piece of equipment.

4) Touch one test lead probe of the meter to the metal chassis of the equipment.

Touch the other test lead probe of the meter to the equipment ground contact of the power receptacle. (If the receptacle is an old 2 wire non grounding type receptacle use the neutral contact of the other receptacle of the duplex outlet. The actual reference point for the test is the Grounded Conductor, the neutral conductor.)

Note the voltage reading.

5) Turn off the piece of equipment. Unplug it from the AC power receptacle. Reverse the plug 180 degrees and plug it back in.


6) Power up the equipment. Repeat procedure 4). Note the voltage reading. The lower voltage reading of the two tests is the proper AC polarity orientation.


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  • RE: Well I tried an experiment - jea48 11:04:53 02/12/17 (0)

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