Products > Test Equipment
DMMCheck Plus Multimeter Reference(and other References) - Experiences..
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Martin72:

--- Quote from: tatel on July 03, 2023, 07:52:04 pm ---If you are on Europe, the full-blown version with LC, dual frequency, enclosure, etc, sets you back €239 on welectron, shipped, and you can have it ISO calibrated for €85 (plus shipping, I guess).

--- End quote ---
This is the point.
Importing the item from the states will cost nearly the same when buying it here from welectron.
Plus the US website explicitly tells you to buy from welectron if you are based in Europe.
I had used welectron's calibration service on my Brymen 869s and did not regret it.
Our calibration service that we use from work only states.
If something is out of tolerance, it is sent back blocked.
The service from Welectron determines AND readjusts it...Very good.


--- Quote ---Certainly it's not cheap, but since I didn't have any referencies, and those doesn't seem to be cheap either, it seemed a reasonable deal to me.
--- End quote ---

I feel the same way.
The reference may not meet higher demands, but if my multimeters already show "strange" values on it, then that is enough to become active.
Currently, I am very strongly inclined to buy the device.
rsjsouza:
I have one of these purchased in 2019 from Doug (non-LC version). Excellent for a quick sanity check of the various meters I have - something that seems to agree with your expected usage as well.
J-R:
Yes, absolutely the DMMCheck Plus is limited at face value, but it's trivial to transfer the confidence around your bench to other devices and also generate further permutations with Ohm's law as I mentioned (solve for the unknown).

I don't think that gets enough attention, and it's one of the tricks so to speak that I personally use to check things from multiple angles.

Example:  I could verify some of my DMMs using the 1mA and 5V references, then connect those DMMs up to a DC supply and go to town on checking resistors.  I'd feel really confident from about 100-5K Ohms in this setup.  How many digits you consider valid will depend on your equipment and you do want to calculate some worse-case values to get an idea of what is sensible.  As I proved in another thread, even the junkiest of equipment ($50 PSU and $30 DMM) can be used to verify low-value resistors at 3 digits using the Kelvin method.


Contemplating this more, I do think the calibrated passives are probably the best bang for the buck feature on the DMMCheck Plus.


For primarily voltage and current it's probably more sensible to just have a couple decent DMMs sent out for calibration and then use them along with a bench supply to generate what you need.  I've found most bench supplies are more stable in voltage regulation than current regulation, so I use that even when generating a precise current.  You monitor the current using the DMM...
Electro Fan:
The comments above regarding how accurate they are and continue to be are pretty consistent with my experience.

I bought 3 of their products way back in the day and was/have been happy with all of them (two are marked 2011-12 Rev 1, and one is 2008 R4).

Since then there have been various improvements.

Overall, it's mostly a function of your TEA to budget ratio, so YMMV.   

Having said all that, Doug is a good guy making good products, so I'd say if in doubt but you can afford it, go for it.  :)
Fungus:

--- Quote from: KungFuJosh on July 03, 2023, 03:25:54 pm ---Those random examples are all trash.

--- End quote ---

I've measured mine on various multimeters and it seems legit.

There were quite a few in that thread I linked to that were legit, too.


--- Quote from: Electro Fan on July 04, 2023, 01:13:31 am ---The comments above regarding how accurate they are and continue to be are pretty consistent with my experience.

I bought 3 of their products way back in the day and was/have been happy with all of them (two are marked 2011-12 Rev 1, and one is 2008 R4).

--- End quote ---

The hardware in those devices seems OK, it's the calibration where some sellers are cutting corners.

I'm sure you can get a good one if you take the time to go through all the Aliexpress comments/ratings. I just posted a few random listing to give an idea of prices.

nb. The references in them are probably pulled from old devices. The silver lining is that they'll be well burned-in.  :)
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