Hello,
you know that even a metal foil resistor can drift several 10 ppms due
to soldering?
(and may need several months to stabilize).
https://www.eevblog.com/forum/projects/vishay-bulk-foil-drift-after-soldering/msg445297/#msg445297
Of course the effect may be less on oil filled metal can resistors.
But after exchangeing the reference resistor I would wait some months
before next calibration.
With best regards
Andreas
Am 25.06.2019 um 13:50 schrieb Dr. David Kirkby:
I want to change a 400 k ohm through hole resistor in a HP 34970B data
acquisition unit
https://www.keysight.com/en/pd-1000001313%3Aepsg%3Apro-pn-34970A/data-acquisition-data-logger-switch-unit
The resistor is only 1% tolerance, but has a temperature coefficient is 2
ppm/deg C. Once the instrument is calibrated, changes in the value of this
resistor will mess up the resistance measurements on the data acquisition
unit.
What is the best way to fit the resistor in such that there are not any
avoidable changes in value?
I did think of cleaning the resistor with IPA once it Is soldered in, but
IPA readily absorbs water, so I am concerned IPA this will leave residual
around.
Dave.
_______________________________________________
volt-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.
