[time-nuts] Measuring 1 PPS with an HP 5335A

cheater00 . cheater00 at gmail.com
Sun Feb 16 14:46:14 EST 2014


Maybe it needs more pulse width at low freq?

D.
On 16 Feb 2014 20:15, "Jimmy Burrell" <jimmydburr at gmail.com> wrote:

> I've recently purchased an HP 5335A and for the most part, we're getting
> along famously. Then I tried to measure my GPS' 1 PPS pulse. I'm not seeing
> anything Iike what I'd expect to see, e.g. 0.000001. Doesn't matter what
> type of measurement I select (freq, period) the measurements are nowhere
> near "1". In fact they are all over the place and changing a lot faster
> than once per second.
>
> My first thought was "not enough signal" present at the input of the
> counter causing a low SNR. But my scope says it's better than 2v on p-p.
> According to the HP5335A manual, that should make the counter happy.
>
> I've never tried measuring any freq. this slow so I'm out of my element.
> Probably missing something obvious.
>
> Any of this ringing a bell with anyone? Any clues or suggestions?
>
> Many thanks,
>
> Jimmy...
> N5SSPE
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