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Old 12th Jul 2018, 8:16 pm   #2
cathoderay57
Nonode
 
Join Date: Oct 2017
Location: Bristol, UK.
Posts: 2,354
Default Re: VCM163 Calibration Question

I should maybe add that the oscillator board outputs to which the multimeter is intended to be plugged carries a 14.7kHz sinewave signal. The measurement was intended to be made using an Avo EA113 electronic multimeter which is of a very high impedance. I don't have one but my assumption in the above post is that whatever the EA113 did, it had an analogue meter display, and so on the AC range with a sinewave input it would probably display an RMS as opposed to a peak value. Hence my question whether using a scope I should set the value at 21mV peak (=15mV RMS). I have in fact already done this and there is sufficient range on RV1 and RV2 to align the gm meter at the cal mark so I will leave it like that unless somebody convinces me differently. Cheers, Jerry.
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