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HP 3457A DMM reads 0.550 Ohm over value

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Swake:
Hi,
Got a new to me HP 3457A today and performed a quick review. The resistance measurement in 2Wire reads about 0.550 Ohm higher than it should be in the lowest 4 ranges. In 4Wire mode it is 0.0180 Ohm too high.

How 'bad' is this? Can this still be calibrated or is it more of a repair job?

I didn't verify all other ranges yet, but DC Voltage and DC Current seem fine.

Kleinstein:
An offset in the 2 wire mode is not a surprise, though 0.5 ohm is still high.
Getting the same offset in different ranges would not be a fixed voltage offset.
I see little chance to get such an error from an hardware fault - more like a really poor calibration.

Maybe also check the resistor values for possible other problems.

Swake:
Thanks for that information.
I corrected the 4-wire measurement values in my initial post as I made an error in my notes.

Swake:
I will attempt a calibration of 2-wire offset as that only needs a short from what I could read.

bdunham7:
Just out of curiosity, if you leave it connected with a 4W short but measure in 2W mode, what do you get?  A agree that this may be an offset calibration issue since it seems unlikely that 0.55R has appeared internally where it wasn't before.  But I'm not sure how the error would have occurred.

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