[volt-nuts] Thermistor value for 732A Reference 10V Standard

[Rob Klein]

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, Leedyt at aol.com 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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