[volt-nuts] Precision resistor testing

Frank Stellmach frank.stellmach at freenet.de
Sat Nov 15 10:53:07 EST 2014


if you need to measure the T.C.s of your assemblies, then your 3458A is 
stable enough to do that nice volt-nuts project. You only need a 
temperature stable environment, a precise thermometer (PT100, precision 
NTC), a 2nd DMM for the thermometer, and data acquisition.

I also have done these delicate measurements on Vishay VHP202Z with high 
stability that way. Also important was the good coupling between the DUT 
and the thermometer, and also that they were having a thermal mass (alu 
block and alu case). See Andreas' thread and my setup here:

As this is a relative measurement, this T.C. measurement can be easily 
done with an uncalibrated 3458A also.

After that, it should be relatively easy to find a cheap possibility to 
measure the absolute value of these reistors at a certain temperature. 
That would fully characterize the resistors.


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