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Old 25th Nov 2020, 8:16 pm   #2
Dekatron
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Join Date: May 2009
Location: Linkoping, Sweden
Posts: 1,179
Default Re: VCM 163 problem while calibrating

Has the cut-out relay activated so that transformer T1 is without primary voltage? If so the amplifier is not powered so the needle can't move.

Another common reason is that RV1, Cal. mA/V, potentiometer has gone open circuit so no signal from the oscillator is fed to the input of the amplifier.
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