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Keithley DMM7510, SMU 2450 & 2460 problems

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HighVoltage:
Just to update you on my progress...

Keithley released another interim FW version1.6.3c
Last week I installed it on my three Keithley instruments 2450, 2460 and 7510
It seems this has fixed the hanging web interface problem as well now.

An official new FW update should come soon.

dr.diesel:

--- Quote from: HighVoltage on February 25, 2017, 01:13:55 pm ---
Keithley released another interim FW version1.6.3c

--- End quote ---

It also fixed (I've not tested the web interface yet) the triggering issue reported by maxwell3e10

dr.diesel:

--- Quote from: HighVoltage on February 25, 2017, 01:13:55 pm ---It seems this has fixed the hanging web interface problem as well now.

--- End quote ---

Tested the web interface today, locked it up twice within 3 min each time.   :(

maxwell3e10:
I played a bit with the new FW. The trigger hang-up problem does seem to be solved. Now there is a new problem, some menu items become grayed out. In particular, when Save to USB is grayed out, one cannot save the data and the only way I found to fix it is to restart the instrument, thereby loosing data in the buffer.

Regarding noise, the behavior is the same. I tested another method using a .tsp script:
repeat
dmm.measure.autozero.once()
dmm.measure.read()
until false

This forces the autozero and eliminates the bump in the Allan variance. The only problem is that it is slow, the cycle time is about 20 times PCL setting. But it is still better than normal operation, which again points to the fact that the AZ algorithm is too smart for its own good.

maxwell3e10:
I played more with a .tsp script to force autozero between measurements. Here are the results of an optimized script (attached) that uses four 1 PLC measurements between each forced autozero. This works  much better than continuous 10 PLC readings. Still not as good as Keysight 34465A.

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