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Keithley DMM7510, SMU 2450 & 2460 problems

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kj7e:
New 7510 Firmware v1.6.7c now available,;
https://www.tek.com/digital-multimeter/dmm7510-software/model-dmm7510-firmware-revision-167c-and-release-notes
 

MegaVolt:

--- Quote from: kj7e on November 14, 2018, 02:41:31 pm ---New 7510 Firmware v1.6.7c now available
--- End quote ---
Thank!!!

Discovered curious spikes for a range of 100 V and NPLC = 1 and NPLC = 0,1. Other NPLCs look pretty ordinary.

The file with the data is attached.

Emissions are not large and fit into the instrument specification. But they look like some kind of problem :( May be software.

FW 1.6.4

dr.diesel:

--- Quote from: kj7e on November 14, 2018, 02:41:31 pm ---New 7510 Firmware v1.6.7c now available,;
https://www.tek.com/digital-multimeter/dmm7510-software/model-dmm7510-firmware-revision-167c-and-release-notes

--- End quote ---

2450 also!

MegaVolt:
And here's another oddity:

This voltage jumps when the input resistance changes on the ranges of 0.1V and 1V at 1NPLC

Moreover, for a range of 0.1V, the jump is 6 µV or 60 ppm.

AutoZero can be in any condition.

The input is shorted.

Does anyone else see this?
Or is it a marriage?

maxwell3e10:
Its also surprising that the noise is dramatically higher on the 10 Mohm setting. I have actually seen something like that, but it was not reproducible, sometimes the noise would not increase. So, its not a mirage, its a ghost. :palm:

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