[time-nuts] FE-5680A arrived

Bob Smither smither at c-c-i.com
Wed Jan 11 21:12:39 UTC 2012


Bob Smither wrote:
> 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 :-(.

OK, I am still learning how to set up my 54645D.  Upon reseting the scope and
adjusting the trigger it is clear that the 1pps pulse is there.  The pulse is
TTL level and very close to 1 usec wide.

I have noticed the the 1pps pulse goes away when I make a large change to the
offset count through the RS232 connection.  The pulse comes back after the unit
has settled for a while.

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