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Old 11-16-2012
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Re: Voltage tester idea

Quote:
Originally Posted by Maine Sail View Post
My Fluke meters are all calibrated, my cheapies not so much, but I'd love to grab one of these chips. Got a link?????
Well for $2 this is a 0.1% shunt reference (like a zener).
LM4040AIM3-10.0/NOPB Texas Instruments | LM4040AIM3-10.0/NOPBCT-ND | DigiKey

It needs a bias current (100uA to 15mA) though which could be as simple as a resistor to 12V (perhaps a lighter plug outlet) or you could get the 1.225V version and use a couple batteries with a resistor and a switch.

I'm also curious what hello has got.

Edit: I'll also add that as far as cheapies go the one I linked earlier is pretty damn good. Auto ranging, shuts off automatically, buzzer for continuity and it includes internal space for the (small) leads under a cover that doubles as a stand. It's ideal for throwing in a tool bag. When I've had it next to a fluke the accuracy has been near dead on.

The purchase I regretted was the $35 meter I bought. That one failed on me. Lesson learned. I'll try to stick to things that are either really good or really cheap. It's hard to go wrong that way.
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Last edited by asdf38; 11-16-2012 at 12:35 PM.
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