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

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Alex Nikitin:
Here is the result of a long run over the weekend (68 hours in total), 10K LT450C in a grounded enclosure, NPLC100, 10sec sampling intervals. I will talk to Keysight later today  :( . My two Keithley 2015 at home have less than 2ppm p-p noise on 10K resistor with NPLC10 + 10 averages (about an equivalent of NPLS100).

Cheers

Alex

Dr. Frank:
Just for completeness, here's another 12h run, after ACAL, and fully warmed up.
Apart from the initial fluctuations, the reading is stable to < 0.5ppm over 12h, StD measures 0.16ppm.
That's as should be, very nice.

For narrowing the error, I propose to check the front/rear switch by engaging it several times, and if this fault also occurs on the rear jacks.
Then, you might check the stability of the 10kOhm current source in 4W mode with another DMM, I think it's 100uA.

Frank

Alex Nikitin:

--- Quote from: Dr. Frank on October 24, 2016, 07:11:42 pm ---Just for completeness, here's another 12h run, after ACAL, and fully warmed up.
Apart from the initial fluctuations, the reading is stable to < 0.5ppm over 12h, StD measures 0.16ppm.
That's as should be, very nice.

For narrowing the error, I propose to check the front/rear switch by engaging it several times, and if this fault also occurs on the rear jacks.
Then, you might check the stability of the 10kOhm current source in 4W mode with another DMM, I think it's 100uA.

Frank

--- End quote ---

Hi Frank,

Thank you, I will check the front/back terminals tomorrow. Meanwhile Keysight came back to me and essentially said that 25ppm variation is inside +/-35ppm 90 days specification for 10K range  :palm: . I did point out to them that there is also the specification on the noise for resistance ranges and for NPLC 100 and 10K it is 1ppm . Let's see what their reply would be this time... . May I use your graph in my correspondence with Keysight as an example of a healthy 34465A readings?

Cheers

Alex

saturnin:
For 34465A, 24-hour stability of 10K range is +/-25 ppm. Value of +/-35 ppm is valid for 34460A - they even don't know specs of their own products, lol.

Btw. I wonder where you found specs on the noise performance of resistance ranges? I can't find them...

Alex Nikitin:

--- Quote from: saturnin on October 25, 2016, 06:01:18 pm ---For 34465A, 24-hour stability of 10K range is +/-25 ppm. Value of +/-35 ppm is valid for 34460A - they even don't know specs of their own products, lol.

Btw. I wonder where you found specs on the noise performance of resistance ranges? I can't find them...

--- End quote ---

1) My error (already corrected) - they actually did refer to 90 days spec (!)

2) Here is the part of the data sheet for the 34460/61/65/70A.

Cheers

Alex

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