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Re: [TCML] Strange Voltmeter Behavior


This sort of behavior is common with some meters, and is the result of static electricity charges built up on the plastic meter face and affecting the very sensitive meter needle.

Wiping down the meter face with a juicy fabric softener dryer sheet will often resolve the problem.


On 5/10/2018 12:17 AM, Steve White wrote:
In the control cabinet for my SGTC I have a Simpson 0 - 300 volts AC Wide-View iron vane voltmeter measuring the voltage from the wall. I briefly powered up the cabinet for a few seconds to check some things and then switched it off. Then, with all power off, I placed my finger over the indicator pointer of the voltmeter and its movement tracked my finger movement through the clear plastic cover! After this strange behavior, the pointer settled at a position substantially above the zero voltage point. It settled at about 30 volts with no power applied. I noticed that as time went by, the pointer gradually settled back to its true zero voltage point. This took about 10 minutes. I have PFC capacitors but I had them switched out at the time. The only other energy storage components that I can think of are the capacitors in the EMI line filter bricks. I don't think it could be static electricity because I tried discharging my body and the pointer still followed my finger. None of
   the other voltmeters and ammeters in the control cabinet display this strange behavior. Does anyone know what is going on here?


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