Products > Test Equipment
Cheap, not Chinese, Voltage reference for DIY meter calibration
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tautech:

--- Quote from: luma on June 05, 2024, 07:58:33 pm ---How about https://dmmcheckplus.com/

Solid reference, but the key value is the cheap and fast calibration service in the future.  $20 service + $7 shipping (and free for the first two years) makes a solid reference into a damn useable standard for the home gamer.

--- End quote ---
Certainly one of the best and trusted solutions....and we discussed these at length privately but $ more that Dazz wants to outlay.
Martin72:

--- Quote from: luma on June 05, 2024, 07:58:33 pm ---How about https://dmmcheckplus.com/

--- End quote ---

I have the device, it's good for a quick check(therefore it´s name) to see if a meter is working.
As a reference it is OK for 3.5 digit meters.
The LCR option is somewhat sobering.
The capacitors and coils are not exact types, but simply measured.
But as I said, it's good for testing and comparing.
dazz1:

--- Quote from: KungFuJosh on June 05, 2024, 01:48:43 pm ---
You're certainly not. There are many threads dedicated to DIY refs, including this one: https://www.eevblog.com/forum/testgear/elektor-voltage-current-calibrator-project/

--- End quote ---
I have made Elector stuff years ago and it was always nice but it sounds like their quality control is not so good for this project. I see you spent $USD366 on the Elector calibrator. 

I note there is a commercial calibrator on that thread that was "only" £350  https://www.ianjohnston.com/index.php/onlineshop/handheld-precision-digital-voltage-source-2-mini-detail  Looks good but too many £££ for my budget.


--- Quote from: KungFuJosh ---It's not a cheap project (build cost probably still above $500 per unit), and it should get calibrated too.

--- End quote ---
For that money it would only make sense to get it properly calibrated.


--- Quote from: KungFuJosh ---Whether you go the DIY route, or get a premade ref, they all need significant burn-in time for stability. Once they're stable, they're worthy of calibration.

--- End quote ---

Looking at a few data sheets, it appears that the initial value of voltage references can be quite different to the nominal output voltage.  Maybe 1% or so.  That would make it fairly essential to get it calibrated.
dazz1:
Hi
I have just found the LB02A process calibrator which looks promising.
https://www.aliexpress.com/i/1005001632714207.html
 reviewed here:


It is Chinese and not lab quality substitute for a good volt reference but its usefulness could compensate for that. 

The LB06 is the highest priced version.
dazz1:
Hi
It appears the LTZ1000 was replaced by the ADR1000 that was then replaced by the ADR1001.
At about $USD100 definitely not the cheapest solution but maybe the best accessible for a DIY solution.
https://www.digikey.co.nz/en/product-highlight/a/analog-devices/adr1001-precision-voltage-reference

Marco Reps channel did a ADR1000 reference
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