Hi!
Can anyone give me a rough value of the thermistor resistance that is
brought out to the front panel of a Fluke 732A DC Reference Standard (lower
left-hand side)? The thermistor is for the user to monitor the temperature of
the oven that contains the voltage reference. I see a resistance that
starts out at 6600 Ohms (unit was nearly cold) and climbs and levels out at
about 8400 Ohms after a day, or so. Is this reasonable? The thermistor is
given in the parts list as RT2, a Fenwal JA41J1 (no longer made) and on the
schematic as a 10K @ 25C unit. So this doesn't make sense.
Does anyone have any experience with this? Or is just simpler to replace
the thermistor with a 100 Ohm RTD and be done with it? Or would this drive
the calibration labs nuts?
Any references or advice would be appreciated.
Tom Leedy
Clarksburg, MD
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