[time-nuts] Modern HP5065A adjustment ideas ?

Poul-Henning Kamp phk at phk.freebsd.dk
Thu May 7 18:45:58 UTC 2020


I am finally getting to time to attend to my second HP5065A which never
really worked reliably since I found it on eBay.

The root-cause is now fixed, the digital divider part of the synthesizer
was unstable, because of the unobtanium one-shot being unstable.

I replaced the entire digital divider part with a LPC810 chip, which
can do the job admirably with its PWM output.

So now I am going through the entire unit and checking/tuning as I go.

Has anybody given any thought to how the tuning procedures can be
improved with access to more modern instruments ?

I'm particular interested if anybody know how to measure the S/N using
a HP8568B or HP3577A ?

I'm also wondering if a digital oscilloscope can monitor the phase
splitting a better way than with the X-Y mode display ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.




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