[time-nuts] Jitter Test on Dividers
kilodelta4foxmike at gmail.com
Sun Sep 20 21:19:05 UTC 2009
I ran a 24 hour test on the async dividers (74HC390s) that Tom Clark
designed and they basically have a triangular peak to peak jitter of 500
picoseconds over 22 minutes. The baseline drift started at reference
0 ns and made a negative parabola that dipped to -750 picoseconds
and then returned back to the reference, over 24 hours.
I check the TADD-2s (two units for seperate 12 hour test) and they
appeared to not have any drift. One unit showed a standard deviation
of 34 picoseconds, The other unit showed 20 picoseconds.
The time interval counter is a HP5370B, which tested at 20
Brian Kirby - KD4FM
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