[time-nuts] FE-5680A arrived
davidwhess at gmail.com
Wed Jan 11 15:17:29 UTC 2012
On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither <smither at c-c-i.com>
>Joseph Gray wrote:
>> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
>> of noise that looks like a multi-stepped sine wave. I'm using a TDS
>> 340 scope.
>I can see the 1 usec, 1pps on mine, but only if I use an analog storage scope.
>Although my HP54000 series scope triggers at 1PPS, for the life of me I cannot
>get it to display the 1 usec pulse :-(.
You might need to darken the oscilloscope environment or use a viewing
hood. Some analog non-storage oscilloscopes, either because of design
or age, are not going to be able to display a short pulse at 1 second
intervals. I tested this on my old but in good condition 2230 and it
could display it dimly in normal room light but my older worn 7603 can
More information about the time-nuts