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how do you calibrate a dvm with 6.5 digits?

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J-R:
Be sure to cruise the Metrology forum.  There are a lot of conversations about this topic over there.

My top comment is: don't forget to observe accuracy specifications.  For example, with the HMC8012 a 10V DC input could display between 9.9972-10.0028 and still be within the 1 year spec.  It also requires a 90 minute warm-up period.  So you probably could get away with sanity checking it against a $175USD 50,000 count DMM in this case.

This next thought was mentioned in passing, but start building a small collection of references/standards that you can use to check your equipment regularly.  It's better to ship those out than the equipment itself.  Only if your test equipment shows evidence of being out of spec would you then have it calibrated/adjusted.

Unfortunately, all three of the top references/standards that I would suggest for a typical hobbyist to consider are currently out of stock:
https://dmmcheckplus.com/shop/ols/products/dmmcheck-plus-without-enclosure
https://voltagestandard.com/shop/ols/products/pentaref
https://www.ianjohnston.com/index.php/onlineshop/handheld-precision-digital-voltage-source-2-mini-detail

Also, it's good to have some precision resistors for checking resistance functions, but also for various Ohm's law calculations.  This can help you generate additional inputs for your equipment in order to check things from different directions.

Used/vintage gear can be popular due to stability from aging.  You could mix vintage for stability along with new for modern features like ethernet and big, color screens.

TheDefpom:

--- Quote from: J-R on May 02, 2023, 03:16:51 am ---

Unfortunately, all three of the top references/standards that I would suggest for a typical hobbyist to consider are currently out of stock:
https://www.ianjohnston.com/index.php/onlineshop/handheld-precision-digital-voltage-source-2-mini-detail


--- End quote ---

I believe Ian is currently building some more PDVS2 Mini's so he may have stock soon, he did a video on it the other day.

tautech:

--- Quote from: TheDefpom on May 02, 2023, 09:43:27 am ---
--- Quote from: J-R on May 02, 2023, 03:16:51 am ---

Unfortunately, all three of the top references/standards that I would suggest for a typical hobbyist to consider are currently out of stock:
https://www.ianjohnston.com/index.php/onlineshop/handheld-precision-digital-voltage-source-2-mini-detail


--- End quote ---

I believe Ian is currently building some more PDVS2 Mini's so he may have stock soon, he did a video on it the other day.

--- End quote ---
I hear he might be short of caps after he sent a booby prize package to you.  :-DD

TheDefpom:

--- Quote from: tautech on May 02, 2023, 09:48:07 am ---I hear he might be short of caps after he sent a booby prize package to you.  :-DD

--- End quote ---

I still need to sit down and start sorting those out...

Tony_G:
I need to revisit my TEA cred, I haven't tried to acquire one of Ian's standards because I had the DMMCheck (along with an uncalibrated 5200A & a working 5440B).


--- Quote from: TheDefpom on May 02, 2023, 09:53:31 am ---I still need to sit down and start sorting those out...

--- End quote ---

Should probably get onto that, assuming you haven't run him out of the "Cap Game" DefPom.

TonyG

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