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Old 5th Dec 2020, 5:36 pm   #20
Dekatron's Avatar
Join Date: May 2009
Location: Linkoping, Sweden
Posts: 1,178
Default Re: VCM 163 problem while calibrating

If you mean that you got the 15mV across the red & brown connectors on the oscillator board, then it works ok, however you can't be sure that the output transformer is working unless you measure a signal across pin 4 & 5.

The signal comes from the oscillator board and is then passed through RV1, R28, R29, R30 & R31 and the mA/V rotary switch to the input of the amplifier board producing a signal that should make the meter move to the CAL position.
Martin, Sweden
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