[time-nuts] Scopes and 1 PPS signals?

Tom Van Baak tvb at LeapSecond.com
Wed Oct 24 22:20:06 EDT 2007

> I tried the SR620.  It's  bouncing around a 32 Hz period.


You have a house standard, right? (GPSDO or cesium). Use
your SR620 to take a set of N (10 or 100) TI measurements
between your local reference and the O-1814 *rising edge*.
Then again using the O-1814 *falling edge*. The difference
between these two measurements is the average width of the
O-1814 pulse. Easy to do & very high accuracy.

Check the sdev of each measurement to make sure nothing
funny is going on; a couple of ns is OK. Hint: you get better
data if you 1) sync the O-1814 1PPS to less than, say, 10 uS
of UTC, and 2) if the O-1814 is tuned to within, say, 1e-11, of
your house reference.


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