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

Bob kb8tq kb8tq at n1k.org
Sun Jul 9 13:27:43 EDT 2017


People *have* been known to sort MiniCircuits parts and use the “extras” in 
something else. A certain major oscillator manufacturer once bought a bunch
of RPD-1’s , sorted them for the “one in a hundred” examples, and then returned
the rest for credit…… Somehow I doubt HP didi it quite that way.

4 degrees at 10 MHz. A LVCMOS inverter has a delay of about 2.5 ns. Delay time
on cheap flip flops is no longer broken out in enough detail to really see how they 
are doing. 


> On Jul 9, 2017, at 1:14 PM, Orin Eman <orin.eman at gmail.com> wrote:
> 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
> $14.
> https://www.minicircuits.com/pdfs/PSC-2-1.pdf
> https://www.minicircuits.com/pdfs/PSCJ-2-1+.pdf
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