Electronics > Metrology

DMM does not stabilize when measuring resistance

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pwnell:

--- Quote from: TiN on December 04, 2021, 08:34:54 pm ---Also Z202 max TCR spec is 2.8ppm\K, not 0.2 ppm\K. Don't fall for "typical" specmanship from VPG on these. You cannot expect to have every random resistor meet typical spec. Short term rift of your DMM is also expected to be much bigger than one from resistor itself.

--- End quote ---

Where do you see that in the data sheet?

TiN:
Page 1, Table 1. Also my statement above comes from experience with testing hundreds of resistors (both VPG metal foil type, wirewounds and metal films).
I did explain this a bit here.

joeqsmith:

--- Quote from: pwnell on December 05, 2021, 01:48:03 am ---Last one is 4 wire

--- End quote ---

Without anything to show how it was setup, I assume based on:

--- Quote ---So here are some graphs - all same test setup:
--- End quote ---

that you are still mounting the part with the BNC inside the copper and using a 4-wire to the BNC.  All a pure guess as I can't see what you are doing.

pwnell:
Very informative article, thanks.

pwnell:

--- Quote from: joeqsmith on December 05, 2021, 02:30:28 am ---Without anything to show how it was setup, I assume based on:

that you are still mounting the part with the BNC inside the copper and using a 4-wire to the BNC.  All a pure guess as I can't see what you are doing.

--- End quote ---

Sorry, it was a separate post and I used the bnc for the current wires and separate wires to the resistor from the sense terminals for that last graph only. So 4 wire, no copper tube.

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