Re: Precision Voltage Reference
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Those are expensive for how frequently?you'll use one of?them.? No wait, they're just plain expensive. ?
Also, lead time may be expensive.
And yes, of course I have one!
73 Jim N6OTQ
On Sun, Dec 11, 2022 at 5:39 PM PAUL KOBY < paulkoby@...> wrote:
Check this out as this should be all you need for regular multimeters.
Does anyone have an experience with the cheap voltage references available on Amazon and Ebay based on various Analog Devices AD584?
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The prices are insanely low, some research suggests the voltage references were pulled from used equipment and repurposed, which might be a good thing because the IC might have stabilized.
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Electronic Goldmine has Maxim MX580JH 2.5V +/- 75mV for $2.49.
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Since my DVMs have 200mV, 2V, 20V scales, I don¡¯t expect to do any work on more then 20V, what reference voltage do I need?
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With the MX580JH, a 500 ohm and 2000 ohm resistor in series would give 2.000V at the junction. Metal film resistors are reasonably stable.
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I can verify the actual device voltage with calibrated equipment in the instrumentation and measurement lab.
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I have 2 3 and a half digit DVMs and 1 4 and a half digit DVMs. I¡¯ve checked them in the I and M lab and they are all within specs, but I¡¯d like to be able to do reasonable accuracy checks at home.
How accurate a reference do I need?
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