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DIY Precision Reference for DVM Calibration

Started May 3, 2020 | Discussions thread
mawyatt2002
OP mawyatt2002 Contributing Member • Posts: 502
Re: DIY Precision Reference for DVM Calibration

Hi Johannes,

Very nice looking reference assembly, well done!!! Is that a custom 3D printed case, looks really nice and create a nice overall package. Something (3D printing) I wish I had and may consider getting involved with.

How is the long term drift with the LT reference?

I've been running the LM399 for about a week now continuous to let it stabilize, so far only about 100uv change.

There is a LT reference diode similar to the LM399 called the LTZ1000 that's even better than the LM399, but these are very expensive whereas the LM399 is still under $10.

Wanted to include reference resistors and currents in the design, voltage, currents and resistances could be compared. So 100, 1K, 10K, 100K, 1M ohm precision resistors and 100ma, 10ma, 1ma, 100ua and 10ua currents are supported.

BTW still waiting on the precision components to arrive, then will decide if the PCB should be fabricated, there is a minimum build quantity of 5, so a few "extras' will be available.

Best,

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