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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