Hi,
With low-pass filters, I think.
This is the simplest method: an rc filter and measure is done on the
capacitor poles.
Ilia.
On 02/12/17 06:08, Scott Stobbe wrote:
I was inspired recently coming across a Lampkin 105 frequency meter, as to
how frequency measurement was done before counters.
Certainly zero-beating a dial calibrated oscillator, would be one approach.
Is there a standout methodology or instrument predating counters?
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Ilia Platone
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