Re: Racal Dana 9916 Frequency Counter.
IC1 pin 4 should be one of two logic levels - nominally 0V or nominally +5V. And I would expect from what the manual said it to be DC at one of those two voltages. So 3.124V looks decidedly suspect to me. Is there some waveform on that pin that your DVM is averaging to 3.124V?
Richard
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