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

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KungFuJosh:

--- Quote from: Martin72 on July 15, 2023, 01:20:34 pm ---
--- Quote from: KungFuJosh on July 15, 2023, 02:03:44 am ---Maybe I'll make a test PCB for all the SMD stuff I got for calibration. 🤔

--- End quote ---

Remember my post ?

--- End quote ---

Yup. But for me, it doesn't matter. I only care to see if the accuracy drifts over time. And I don't need everything to match for 6 digits; if it's close enough, it's close enough. For you, I'm pretty sure you would want a cal lab to certify values first anyway. 😉

Though I don't think I'm going to limit this to SMT stuff. Especially for the inductors where THT gives a better range with more stability.

KungFuJosh:

--- Quote from: mawyatt on July 15, 2023, 12:42:23 pm ---Something like these?

--- End quote ---

I'm going simpler than that. Similar to the DMMCheck's L/C board, but covering LCR. Test points for each device, and 1 common for use with kelvin leads in each section.

Martin72:

--- Quote ---Yup. But for me, it doesn't matter.
--- End quote ---

In most cases, you don't have the right test frequency, but what you are measuring is enough if it is always measured that way over time.
OK, then that's the way it is.

KungFuJosh:

--- Quote from: Martin72 on July 15, 2023, 02:40:11 pm ---
--- Quote ---Yup. But for me, it doesn't matter.
--- End quote ---

In most cases, you don't have the right test frequency, but what you are measuring is enough if it is always measured that way over time.
OK, then that's the way it is.

--- End quote ---

Exactly. Check it out, I designed my PCB. 😉

Martin72:
Why not ?  ;)
Could be interesting to measure nH/pf on it.

Another voltage/current reference project:

https://www.elektormagazine.de/labs/voltage-current-calibrator-0-to-10v-and-0-to-40ma-0001

I must confess I was too fast and ordered the PCB by JLCPCB, they´re already on their way.
Too fast because did this before looking at the BOM.. ;)
Several ICs are not avaible before 2024 and then they cost..not less.

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