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":
http://phk.freebsd.dk/hacks/HP5065A/20150828_c_pot/index.html
... 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
[email protected] | 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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