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Keithley DMM7510, SMU 2450 & 2460 problems

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HighVoltage:
I have played with the instrument and new FW installed and found no issues at all so far. No more blue screen for me or freezing situations. For me it works perfectly right now.
But lets wait a few days for the final verdict.

maxwell3e10:
Here is an interesting plot of Dr.diesel's data measuring 731B 10V voltage reference using a custom AZ script that I wrote (lownoise.txt). I compare it to the data that I took earlier using a standard 10PLC measurement of a 10V battery. 
https://www.eevblog.com/forum/metrology/dmm-adc-noise-comparison-testing-project/msg1094322/#msg1094322

One can see that in the time range of 10 to 100 sec the custom AZ script removes the noise bump in the Allan variance. At longer times both measurements are affected by the drift of the voltage references in the meters or by the voltages sources themselves.

This confirms that when measuring a finite voltage the autozero problem of DMM7510 is significant and limits the performance on a time scale of 10 to 100 sec.

They have not attempted to fix this problem with the newest firmware release.  To me this problem was obvious within 5 minutes of getting the meter (at first I thought it was defective until I found data from others posted by TiN). Even though the meter meets the specs since there are no specs for longer than 5 PLC, the time domain data look crappy.  I have already spent a lot of time on corroborating and diagnosing this problem, but at this point it's probably better to just stick to Keysight meters.

HighVoltage:

--- Quote from: maxwell3e10 on April 26, 2017, 08:58:59 pm ---... but at this point it's probably better to just stick to Keysight meters.

--- End quote ---

This is great info again in your post, thanks.

How does a comparable chart look like from a Keysight meter?

maxwell3e10:

--- Quote from: HighVoltage on April 26, 2017, 09:06:26 pm ---How does a comparable chart look like from a Keysight meter?

--- End quote ---

I posted earlier a comparison for Keysight 34465A. For finite voltages it does not look great, but I think its because of the voltage reference. I need to get a 34470A for a fair comparison. Or perhaps someone else here has a 34470A and a decent voltage reference.

Klaas:
@HighVoltage

E.g. Are you also using the LAN network connection  and Kickstart software?
It freeze my touch screen and causes blue screens if I start using the rotary knob.

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