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DMMCheck Plus Multimeter Reference(and other References) - Experiences..

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Domitronic:

--- Quote from: Martin72 on July 02, 2023, 10:45:12 pm ---
Before I hit the buy button, what are your thoughts ?
Thanks in advance..


--- End quote ---

I think it is nice but i don't see the use case for me. If you have multiple DMMs you can compare them to see if they are drifting. If you only have one then you could buy another one for that price or send the one for calibration.

I could not justify to buy the DMMCheckPlus for two reasons. One is that i don't do anything at home where high accuracy is required. The other one is that i could check my multimeters by comparing them to a calibrated 6.5 digit DMM at work.

Fungus:

--- Quote from: Martin72 on July 02, 2023, 10:45:12 pm ---Before I hit the buy button, what are your thoughts ?

--- End quote ---

Have you seen these?

https://www.aliexpress.com/item/1005002190676191.html
https://www.aliexpress.com/item/1005004219629979.html
https://www.aliexpress.com/item/1005004221641169.html

(random examples)

https://www.eevblog.com/forum/testgear/cheap-chinese-ad584-voltage-reference-legit-cal-data-let_s-find-out!/

J-R:
With a freshly calibrated DMMCheck Plus, you could put a 6.5 digit DMM through (some of) its paces.  You get a full page of trust-worthy numbers to compare against.

Can you use it to calibrate/adjust any of your test equipment?  Well, generally not really, although there are perhaps rare exceptions.  Specifically, I used it to adjust the 5V range on my BM869s, which really made the 500,000 count DCV mode significantly more useful.  I also do recall using the four resistors to calibrate a Fluke 8842A.

And maybe a less-common tactic is to leverage known-good values along with Ohm's law in various ways to expand the range of usefulness of the references.

KungFuJosh:

--- Quote from: Fungus on July 03, 2023, 08:08:34 am ---
--- Quote from: Martin72 on July 02, 2023, 10:45:12 pm ---Before I hit the buy button, what are your thoughts ?

--- End quote ---

Have you seen these?

https://www.aliexpress.com/item/1005002190676191.html
https://www.aliexpress.com/item/1005004219629979.html
https://www.aliexpress.com/item/1005004221641169.html

(random examples)

--- End quote ---

Those random examples are all trash. I bought them (thankfully they're inexpensive trash 😉). Most of them don't come with any reference values written. NONE of them come with any form of certification for the values written. The one unit I received that had values written, was mostly bs. I think 3 out of all the written numbers were accurate (checked across multiple meters with higher digit counts than the reference numbers).

The only value for any devices like these are if you know they're measured/calibrated from a reliable source.

Martin72:
Hi,

Thank you so far for all the hints and advices.
What I like on this board is to have not only voltage references, but also having current references - I would check my tek probe with them (plus several windings through the probe).
And having LCR references.
The combination of R-C-L references, voltage, current and frequency references I only found with this board.
Further comments are welcome.. :-+

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