Could it be that it's just the HF-components from a square wave signal that
are screwing up your reading?

On 7/5/06, Gus S Calabrese <gsc@omegadogs.com> wrote:
>
> I have a handheld frequency counter that measures from DC to 2 GHz.
> It has a BNC connector and 50 ohms input impedance.
> ( Battery operated )
> It does okay measuring transmitter frequencies with a stub antenna.
> I tried to measure a TTL level signal at that is around 500KHz.
> The readout bounced around and was clearly reading RFI from the board.
> What kind of probe can I put on this puppy to read TTL signals and
> ignore
> RFI ?
> Regards
>
> Gus S Calabrese
> Denver, CO
> 720 222 1309     303 908 7716 cell
> I allow everything with  "spamcode2006"  in the subject or text to
> pass my spam filters
>
>
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