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Easy way to test the calibration of a DMM (Fluke 45)?

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bdunham7:
OK, mission complete!  The only calibration constants changed were in the DCV sequence.  The results are pretty good, IMO.  I gave the meter the recommended 1-hour warmup, but it really seems to make very little difference.  that means you don't need to leave it on for extended periods which will extend display life.  There are three different options for testing the resistance ranges plus some extended high-resistance test points that don't have corresponding adjustments.  I did two sets--the decades of 3.0 and 1.0--and the extended tests in the 1.0 since I don't have reasonable 30M or 300M standards.





KungFuJosh:
Great work!

Fried Chicken:
Yoooooo the mighty Fluke 45 is back from it's California adventure!

This is some borderline professional work, papers included, packaging excellent, quick rundown of tests as follows (had to go crazy on the compression to get under the 8MB limit):



J-R:
I think a table with the values would be easier for us to read.

Also, there are a lot of missing digits on the DT4251.  It's a 6,000 count DMM, so 5.3V can have two more digits of resolution, for example.

bdunham7:

--- Quote from: Fried Chicken on April 13, 2024, 09:37:37 pm ---Yoooooo the mighty Fluke 45 is back from it's California adventure!

--- End quote ---


--- Quote from: J-R on April 13, 2024, 10:53:18 pm ---Also, there are a lot of missing digits on the DT4251.  It's a 6,000 count DMM, so 5.3V can have two more digits of resolution, for example.

--- End quote ---

I'm glad our friend made it home.  Just a quick pointer--don't use the Auto-V mode on the Hioki if you want any precision at all.  That's not auto-ranging, it is a low-impedance single-range check for voltage that has a specified 2% or worse basic accuracy.  It's appropriate for probing a wall socket or an SMPS primary.

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