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HP / Agilent 34401A hidden menu
iMo:
--- Quote from: CBrandin on October 24, 2023, 07:12:37 pm ---I looked up thermistor data for 2.2k, 5k, and 10k type B thermistors (which is what I think HP supported). They all have the same beta value. HP got a little lazy with the 7-5-2 firmware as all they would have had to do is scale the ohm readings for the 5k thermistor temperature table to support 2.2k and 10k thermistors.
I know this is some heavy math :), but here goes:
Table lookup OHMS = measured OHMS * 5 / thermistor TYPE KOHMS - a whopping one line of code!
in fact, source code wouldn't even have to add one line of code. Instead of table_lookup=measured_ohms, they could have changed it to table_lookup=measured_ohms*5/thermistor_type_kohms.
--- End quote ---
IMHO they do consider the "beta" of the thermistors as well.
https://www.eevblog.com/forum/testgear/hp-agilent-34401a-hidden-menu/msg4659010/#msg4659010
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