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Dekatron · 25th Nov 2020, 8:16 pm

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.

25th Nov 2020, 8:16 pm	#2
Dekatron Octode Join Date: May 2009 Location: Linkoping, Sweden Posts: 1,179	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. __________________ Martin, Sweden