Bruce Griffiths wrote:
>> One concern is:
> How accurate does one' thermometer which one uses to calibrate the
> thermistor bridge setpoint have to be?
>
> Bruce
The thermistors HP used were quite accurate, so you didn't
need a thermometer. You just calculated the correct resistor
value for the t
Dan Rae wrote:
> Bruce Griffiths wrote:
>
>> Meanwhile, before posting a correction I was trying to find data on the
>> oven setpoint temperature tolerance.
>>
>> The relevant HP Journal with an article on the HP10811A is:
>> http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1981-03.pdf
>>
>> One c
Bruce Griffiths wrote:
> Meanwhile, before posting a correction I was trying to find data on the
> oven setpoint temperature tolerance.
>
> The relevant HP Journal with an article on the HP10811A is:
> http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1981-03.pdf
>
> One concern is:
> How accurate doe
Rick Karlquist wrote:
> Bruce Griffiths wrote:
>
>> Dan
>>
>> The real reasons that this part is labelled non replaceable are
>>
>> 1) its epoxied to the oven.
>>
>> 2) Setting R20 to the correct value actually requires plotting the OCXO
>> frequency vs R20 and selecting R20 so that the OCXO fre
Bruce Griffiths wrote:
>>
> Dan
>
> The real reasons that this part is labelled non replaceable are
>
> 1) its epoxied to the oven.
>
> 2) Setting R20 to the correct value actually requires plotting the OCXO
> frequency vs R20 and selecting R20 so that the OCXO frequency is located
> at the station
Dan Rae wrote:
> 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
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:
MF51B104
