[time-nuts] HP5065A C-field current is temperature sensitive

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Aug 19 17:45:03 EDT 2015

Tonight I hooked my HP34972A DAQ up to the HP5065A and struck gold
right away:  The reference zener has a tempco of 20PPM.

Possibly also of interest:  The C-field driver is not very good
and noise on the +20V supply leaks straight through it.

Full details and plots here:


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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