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

Orin Eman orin.eman at gmail.com
Sun Jul 9 13:14:08 EDT 2017

On Sat, Jul 8, 2017 at 5:15 PM, Mark Sims <holrum at hotmail.com> wrote:

> I think the way the fine cal works by checking the the intervals between
> four different edges that a lot of asymmetries in the signals are nulled
> out in the software.
> How good are 1:2 180 degree phase shifters at exactly shifting by 180
> degrees?   At what cost?

The original parts were nothing special!  PSC-2-1 is spec'd at 4 degrees
max phase unbalance - though typical is a lot less - and seems to be about


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