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Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
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Alex Nikitin:

--- Quote from: HighVoltage on October 10, 2016, 08:54:35 am ---Can you also log the temperature during this next test?

--- End quote ---

Unfortunately, no. I will check the temperature occasionally though.

Cheers

Alex
Alex Nikitin:
OK, the tempco of the 34465A appears to be below 1ppm/C, as the temperature rise from 24C to 25.5C only increased the readings by 1ppm or so, not corrected by ACAL and with the rise of only 0.2ppm measured by HP3458A. Not conclusive  ::) . I'll compare the meters again in a while, running 24x7 for now.

Cheers

Alex
Alex Nikitin:
It looks like the 34465A is stabilizing. Here is the data from an overnight run. The lab temperature varied by about 3C. ACAL after this run resulted in about +1ppm change on the 34465A and no change on the HP3458A. For that run I've synchronized the meters, by triggering the HP3458A from the 34465A, measuring every 10 seconds at NPLC100 . The vertical scale is the same as before, 1ppm/div

Cheers

Alex
TiN:
You can poke 3458A with TEMP? command and it will return temperature of it's A1 PCBA for you.
Don't do it each sample though, as it uses relay to switch DCV to internal TEMP signal and then switches back. I usually log TEMP? reading each 50th sample on my runs.
Dr. Frank:
All three devices are good for stability on the order of +/- 0.2ppm/ 24h.
So you might zoom your measurement to that resolution.
The 3458A should at least show no continuous drift in one direction (on that order), to prove that its resistor array inside U180 is fine.
The temperature change is a problem, so that also should be measured in parallel, you can use TEMP? for the 3458A as well.
(TEMP? tracks RT)

Anyhow, nice measurements under difficult environmental conditions.

Frank
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