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HP / Agilent 34401A hidden menu
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CBrandin:
Well, it looks like the support for temperature sensors was limited with firmware 7-5-2 and more complete with later versions.  Thanks for your feedback - i think the mystery is now resoloved  :)
Dr. Frank:
Btw.: for my 3458A, 34465A, 34970A, I also have found several cheaper precision thermistors as replacements, which all fit those (identical) R(T) tables.
I think that KEYSIGHT does not offer all those thermistor types any more, one value only, maybe, and for a horrendous price.
Frank.
CBrandin:
Keysight does sell a 5K thermistor (E2308A) which has banana plugs and a steel tube probe for measuring temperatures in fluids (although that type can be used for a number of applications). The also sell 10K thermistor kits (34308A) that have just wires and bead probe ends. I think with the meters you mention they shifted to thermistor measurements for production line applications (needing small thermistors without banana plugs).  You're right about the prices - they're very high!
CBrandin:
iMo, Does your meter actually change anything when you switch to different THERMISTOR TYPE and TC/TYPE (assuming you have a thermocouple)? I think you can test it without needing different probes - just hook up what you have and see if readings change when you change TYPE selections. I tried that when I tested and nothing changed.
alan.bain:
The 7-5-2 firmware in my 34401A definitely only supports 5K https://www.eevblog.com/forum/testgear/hp-agilent-34401a-hidden-menu/msg4732271/#msg4732271

Interestingly the conversion from to temp is via a rather boring bisection search of a table rather than any kind of functional law. It's one of the least interesting parts of the firmware.

The AC volts is much more interesting. Someday I should type up some of my notes on how it works and what the calibration functions do.
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