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Accurate voltage reference required

ArthurJ · 2007-01-03 22:41:27

I'm looking for a cheap and easy to get/make voltage reference source. I want to calibrate a voltmeter. Ideal would be 15v to 18v at 0.5%.

03-01-2007 10:41PM

#1

ArthurJ

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I'm looking for a cheap and easy to get/make voltage reference source. I want to calibrate a voltmeter. Ideal would be 15v to 18v at 0.5%.

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Comments

#2 04-01-2007 07:26PM

cast_iron

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I think you will probably have to the National Standards people (NSAI, I think.)

Otherwise, you will have difficulty ever knowing how accurate it actually is.
Ain't cheap though.

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#3 04-01-2007 08:20PM

pauln

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A reverse biased zener diode will give you a reference but I don't know about +-0.5%? Apparently you could get somewhere around +-8% with the right circuit http://www.maxim-ic.com/appnotes.cfm/an_pk/2879 and maybe you could find one of these, http://www.national.com/pf/LM/LM136-2.5.html, for what your interested in.

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