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2602A Setting range about a non-zero offset

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jdavidow
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2602A Setting range about a non-zero offset

Post by jdavidow » February 11th, 2020, 10:50 am

I have a client who would like to take resistance measurements with as much accuracy as possible, but about a point that is roughly 200KOhm. That is, they will have micro-ohm fluctuations around ~200KOhm. Is there a way to specify the range such that we "recenter" the offset from zero and use a tighter range for better accuracy?

Andrea C
Keithley Applications
Keithley Applications
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Re: 2602A Setting range about a non-zero offset

Post by Andrea C » February 23rd, 2020, 5:12 am

The resolution required for this is beyond typical meter capabilities. You’re asking for 11 1/2 digit ohm meter performance.

Forgetting about the 2602A and in general, to offset it, a Wheatstone bridge type approach would be needed. However, again the stated resolution goals puts extreme demands on the ppm stability of the other resistive elements in the bridge as well as the required voltage resolution of the null detector.

Thermal stability of entire apparatus would be paramount as well.

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