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