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Keithley DMM7510, SMU 2450 & 2460 problems

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MegaVolt:
Measure the current.
Here, too, there are interesting moments:

Measurements with open inputs:

10µA range - 1.4 pA
100uA range - 24 pA
1 mA range - 127 pA
range 10 mA - 647 pA

These are excellent numbers around 0.1 ... 0.2ppm

Measurements with shorted inputs:

10µA range - 33nA (3300ppm !!!)
100 uA range - 330nA (3300ppm !!!)
1mA range - 3.3µA (3300ppm !!!)
10mA range - 28µA (2800ppm !!!)

These figures are possible in the presence of thermal EMF = 33 µV at the input (28 µV for the last range)

And this is not a thermo emf jumper. After measuring the DCV, I see nanovolts.

This is something internally.

Moreover, this displacement does not create any problem if we measure the "current source".

But it creates problems when measuring the current that generates a voltage source and series resistance. And a two-year error of 20 ppm we get at a voltage of just 1.65V and less. Unfortunately, I have nothing to test this hypothesis.

I would be grateful if someone checks this assumption on precise instruments.
And maybe he will give another version of the occurrence of this error.

MegaVolt:
After talking with the engineers, Keithley revealed the following:
The device retains its accuracy only if the input impedance AUTO mode is set.
Accuracy in 10 MΩ mode is not verified and is not guaranteed.

One of the engineers suggested using relative measurements to zero the offset manually. But in my opinion there is too little information about the reason for this bias. And as a result, one cannot be sure that it is stable and is compensated for by AZ correctly.

The correct specification as I understand it looks like this:

JxR:
New Firmware 1.7.0 is online.  Of special note: the "virtual front panel", now appears to be the same version used on the newer DMM6500.  I've personally never had the DMM6500's virtual panel crash on me, unlike the older versions previously on the 2450 and 7510.  This is all I have checked so far, but very happy with this one change.

JxR:
1.7.1 released to address a critical fix for the SMUs (2450 atleast).

New I-V tracer app available that is installed via Kickstart 2.2.0. Seemed like a cool basic feature, until you find out it is a paid license that starts at $1500.  :palm:

Either way you can try it out for 30 days, then uninstall. 

HighVoltage:
Wow, that was fast for a new release!

Is that I/V tracer app also $ 1500 for those of us who have a full license of Kickstart?

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