What could cause a Fluke T2 volt tester to dance up and down 12-230v

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LukeD

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New batteries ... There is a dimmer attached to the light circuit . Full power its fine .turn down , light flashes , volt meter LEDS dance up and down. 2 x dimmers tried .
 
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LukeD said:
New batteries ... There is a dimmer attached to the light circuit . Full power its fine .turn down , light flashes , volt meter LEDS dance up and down. 2 x dimmers tried .
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Because the sine wave is getting chopped.
trailingedgewaveform1.jpg
 
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What could cause a Fluke T2 volt tester to dance up and down 12-230v
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