[time-nuts] -hp- 10811 repair (Thermistor)
danrae at verizon.net
Thu Jan 22 17:32:15 EST 2009
The 10811-60111 that came in my 5370B counter turned out to have an open
circuit Thermistor in it. This is a "non-replaceable" part in theory.
However, nothing to lose, I have successfully substituted a Digikey Part
number: 317-1371 100 kOhm 1% Thermistor ( from Cantherm, part number:
I measured the resistance of it at the target oven temperature, working
back from the selected value of R20 that was installed in mine, in this
case 0 Ohms for 84C. In fact this thermistor must be very similar to
the one used originally, since I only needed to use a value of 110 Ohms
for R20 to get bridge balance, instead of the short that was in there
Good enough for me...
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