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HP / Agilent 34401A hidden menu

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coromonadalix:
you would need to put the ic in a socket and do fw updates ??

for the front panel mcu  it's another thing ...   between the old vfd pcb and the last iteration, there is a limit on the FW versions, you can not mix them

CBrandin:
I have no need to pursue that as the most common thermocouple type (K) is supported, 5K thermistors are commonly available and the RTD support is fine. That's already more than I need. I compared them all and they came out with pretty much matching temperature readings. I was just curious about the differences between hacked firmware versions.  I had the meter recently calibrated and I wouldn't want to have to recalibrate yet.

Chris

thermistor-guy:
bookmarked

thermistor-guy:
Agilent 34980A supports thermocouple, RTD, and thermistor sensors. For thermistors, manual states:


--- Quote --- The instrument supports 2.2 kΩ (YSI Series 44004), 5 kΩ (YSI Series 44007), and 10 kΩ (YSI Series 44006) thermistors.
--- End quote ---

These are epoxy encapsulated thermistors. YSI catalog (2000) attached here for reference. The 10k device (44006) uses material H, the others use material B.

iMo:

--- Quote from: CBrandin on October 17, 2023, 05:53:36 pm ---Strange... I tried both 10K and 5K thermistors and only the 5K ones worked. I even tested it with a 5K resistor to make sure. Maybe it depends on the firmware version you have. Mine is 7-5-2. It makes sense that later they would try out 10K thermistors as they are more common.

I wonder if later firmware versions actually support all the THERM TYPE and T/C TYPE options. My meter was likely built before the 34970a was introduced, and the later firmware versions were produced after.

Chris

--- End quote ---

Mine is 10-05-02.
On thermistor's material:
https://www.eevblog.com/forum/testgear/hp-agilent-34401a-hidden-menu/msg4659010/#msg4659010

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