[time-nuts] Jitter Test on Dividers

Brian Kirby 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  
picoseconds  jitter.

Brian Kirby - KD4FM

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