Hi Tom,
Definitely not good! The thermistor is supposed to be an NTC, so seeing
the value
rise from cold means there's something very wrong indeed.
If you want to replace it, this might be a good alterative:
http://www.digikey.nl/product-detail/en/192-103LET-A01/480-3158-ND/1886044
Kind regards,
Rob Klein.
Op 29-6-2012 1:04, [email protected] schreef:
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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