[time-nuts] HP Z3801A Question

[Brian Kirby]

You may be interpting it wrong, if your looking at the 1PPS to GPS, 
thats a time interval measurement referenced to the GPS 1PPS.  -1.5x10-9 
would be 1.5 nanosecond...so 1.5ns over 10 seconds would be 1.5x10-10 
Allan Variance compared to GPS

I do not remember, we made measurements several years ago, I believe the 
Z3801 takes 10 second time interval averages and it updates the 
oscillator via the DAC every 30 seconds, if needed.

There information out there on the unit, either here at Febo.com or 
http://realhamradio.com/cgi-bin/yabb/YaBB.cgi buried in the archives..

Brian