Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
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TiN:
34470A has LTZ1000, 34465A - LM399 :).

I'd leave meter running for at least a week, better two and then repeat this test just to make sure. Same procedure apply for 3458A as well, long cold instruments "lose" their stability and need to run awhile to get back to normal stability. Few cases over EEVBlog nuts already confirmed this.
Dr. Frank:

--- Quote from: TiN on October 08, 2016, 09:41:59 am ---...

 Same procedure apply for 3458A as well, long cold instruments "lose" their stability and need to run awhile to get back to normal stability. Few cases over EEVBlog nuts already confirmed this.

--- End quote ---

Does your statement refer to the regular LTZ1000A references,@95°C oven temperature?
AN-18 might apply generally to these references.

Mine is pimped to about 65°C, as you know, and it does not really show hysteresis, maybe about < 0.2ppm, even after a longer period of idle state.

The other two LTZ1000 @45°C, as already stated, should show no hysteresis at all, as they are 25°C above RT, only.

Frank
TiN:

--- Quote ---Does your statement refer to the regular LTZ1000A references,@95°C oven temperature?
--- End quote ---
Hm, you definately right. I referenced to SN18 for standard A9, and did not tested on pimped ones. My box runs 24/7 since repair done.

I might have chance to test this theory in neareast future though  :=\  :o
Alex Nikitin:
Well, the 34465A did drift about 3.5ppm down again over the weekend and returned to <1ppm difference with the HP3458A after ACAL. Here are the graphs. It also looks like a large part of this change is a temperature related drift. I am logging the voltage again just to see if the measured value would go up now when the lab temperature is increasing.

Cheers

Alex

HighVoltage:

--- Quote from: Alex Nikitin on October 10, 2016, 08:31:09 am ---I am logging the voltage again just to see if the measured value would go up now when the lab temperature is increasing.
Cheers
Alex

--- End quote ---
Nice data on your 34465A and comparison to the 3458A.
Can you also log the temperature during this next test?
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