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

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Dr. Frank:

--- Quote from: TiN on March 08, 2016, 08:23:13 am ---Hi Frank,

Very nice data and testing, thanks for all the efforts! May you share few more details on linearity testing methods? You measured 5440 output with both meters and calculated difference between 3458A and 344xx readings? In return I'm interested of doing similar test with other meters, like K2001/K2002.

--- End quote ---

You might also use the 5442A directly, as it's very linear already. I tested mine to about 0.2ppm INL, between 1V and 10V.
It's an old device, so the negative polarity deviates in offset, gain and linearity. Everything is inside the 0.5ppm linearity specification, but it could do better.

Therefore, for high accuracy, I measure 3458A and DUT in parallel, both polarities, 0.1V interval, from -10.5 to +10.5V, so avoiding range switching of the 5442A.

Then, I take 3458A as X, DUT as Y, and let excel calculate a best fit straight line.
The regression parameters give a correction for the 34465A data regarding offset and gain factor.

The difference between these corrected data Y' and Y is the INL data, and its maximum by definition is the INL specification.

See xls file, including linearity calculations for 5442A also.

Frank

TiN:
Thanks, I'll try that with 3245A and my meters. Shipping a beast like 5442A overseas would be a quest, so will use what have first.

Making python script to do related measurement should be an easy task.

plesa:
WOW, thanks Dr. Frank for excellent post. I like it!
It is worthwhile to publish on some blog like http://gpete.blogs.keysight.com/

SKPang:
After 3 weeks they finally approved my free 2M memory upgrade.  :)
They email me the software entitlement certificate. I had to login and download the lic file, copy it over to an USB stick and install it on the meter.

HKJ:
When the free memory upgrade was announced I did not read everything but applied immediately, later I read that it was not "old" meters.
But I got the license today, even though me meter was too old to qualify (now I just need a digitizer license).

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