[Hopefully this time my post is in the required plain-text format!]
The solid-state HP-5210A and its vacuum-tube predecessors, the HP-500A/B/C family, were analog frequency measuring instruments. The circuitry summed the input frequency (converted into pulses) and generated an analog voltage to display on a meter. Higher frequency meant more pulses and thus a higher voltage. My 5210A goes up to 10 MHz and is surprisingly accurate although the resolution, even with an expanded-scale switch, is only three digits. A nice tool in the 5210A is an FM discriminator with adjustable filters.
Jeremy On 2/11/2017 10:08 PM, 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? _______________________________________________ time-nuts mailing list [email protected] To unsubscribe, go tohttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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