[time-nuts] J06 HP-59992A time interval calibrator for HP-531xxcounters

Hal Murray hmurray at megapathdsl.net
Sat Jul 8 17:53:52 EDT 2017

tvb at LeapSecond.com said:
> The PIC dividers are good to a couple ps. I suspect the larger issue is the
> PCB and wiring design. 

What does "good" mean?

I'd expect the variations due to power or temperature would be easy to 

Delay through classic CMOS is linear with absolute temperature and inverse 
linear with supply voltage.

The classic way to get time-nuts level noise on FPGA outputs is to wiggle a 
nearby pin.   That shouldn't be a problem with a dedicated PIC but would 
probably show up if you are generating multiple frequencies.

These are my opinions.  I hate spam.

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