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Keithley DMM7510, SMU 2450 & 2460 problems

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MegaVolt:

--- Quote from: MegaVolt on November 20, 2018, 09:43:54 pm ---Emissions go exactly 160 measurements.
--- End quote ---
These emissions also disappear if you disable AutoZero.

Kleinstein:
The data also show an odd timing:
there are 4 time steps of some 21 ms, e.g. a little more than 1 PLC (which would be normal without AZ mode) and than there is one time step with some 42 ms apart, which would be about the spacing expected with AZ active.
This kind of suggests that there is a zero reading only for every 5 th input reading. and for some reason things go wrong after 32 zero readings.

I don't think this is about line synchronization, as even the Russian grid should not be off so far, and in a way to get the exactly 160 readings period.  My guess would be more something with an extra measurement (e.g. temperature) and than maybe just a little short on settling time for some precharge phase, so that there is some current spike at the input, that than gets measured.

Knowing that the data are coming at a not so constant rate (with an extra 21 ms break every 5 readings) could be important. It there an other AZ more to get the data at a more conventional constant 40+x ms spacing ?

MegaVolt:
Histogram looks very interesting.

a1  AZ ON
a2 AZ OFF

MegaVolt:

--- Quote from: Kleinstein on November 21, 2018, 09:29:26 pm ---wrong after 32 zero readings.
--- End quote ---
Yes, 32 is a beautiful number. I do not know how to find out what happens every 32 AZ

MegaVolt:
in my signal can be broken like this:

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