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

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Aug 28 04:06:46 EDT 2015

Using the Fluke 732A as voltage reference improved HP5065A stability,
but not very much, so I looked closer at the constant-current
generator and the C-field pots "calibration":


... and found out that the current-sensing resistors R10||R11 have
a very high temp-co.

Getting closer...

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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