DC Voltage Measurement Accuracy: AD584KH voltage reference

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

Jan Cumps — Fri, 28 Jul 2023 11:53:07 GMT

Ripple / noise when battery powered: 500 µV

When USB powered: 5.3 mV

In USB mode there's a 530 Hz pulse

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

shabaz — Fri, 30 Jun 2023 18:50:54 GMT

I got this board in the post today!

However, I've noticed a couple of points. I don't think it was calibrated with a HP3458A, because when I measured it, both my measurements, and the ones you observed, were slightly higher than the calibration sticker. It seems like too much of a coincidence, considering we got them from the same AliExpress seller, within the space of a week or two.

I measured at just under 25.0 deg C, at around 24.7 deg C, and you measured above, at 26 deg C.

These are the measurements I got on my board:

Label              My measurement
-------            ---------------
2.49954            2.49963
4.999501           4.99964
7.39875            7.49899
9.99823            9.99854

The other point is obvious from the photo above, that the person doing the calibration must have had a late night! There are two mistakes. The second value has 6 digits after the decimal place whereas the others have 5 digits, and furthermore, there was clearly a typo on the third line, which states 7.39875, it should have been 7.49875 (i.e. the label is not directly printed from a measurement result, it is manually typed). Still, not bad for the price, and I shall stick my own measurements on it, and will check a few meters I have lying around!

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

ggabe — Fri, 23 Jun 2023 04:17:25 GMT

Good, but not great. Better references are available today. It’s a “gateway drug” for higher precision references, a voltnut will buy eventually. So what not start at a higher precision one, if this one will be a throw away?

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

DAB — Thu, 22 Jun 2023 19:35:30 GMT

Nice post Jan.

I would say your accuracy is pretty good unless you are in a laboratory setting that requires more precision.

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

Jan Cumps — Thu, 22 Jun 2023 19:16:12 GMT

A sweet little Brymen BM235

2.499

4.999

7.50

10.00

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

Jan Cumps — Wed, 21 Jun 2023 19:54:41 GMT

One day later: The same measurements, again with meter and reference warmed up. It's 1° warmer than yesterday.

2.4997878455
5.0021127197
7.5012086365
10.002881856

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

Jan Cumps — Wed, 21 Jun 2023 17:40:40 GMT

hehee

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

genebren — Tue, 20 Jun 2023 21:05:34 GMT

Very nice board. This looks like something I should think about getting.

Looks like your DMM6500 is doing a pretty good job!

RE: DC Voltage Measurement Accuracy: AD584KH voltage reference

shabaz — Tue, 20 Jun 2023 21:01:21 GMT

Hi Jan,

That looks like a very useful board, since the supplied measurements are accurate to work with even for those who cannot verify with a decent multimeter.

Very impressive to see that they supplied decent measurements stuck on!