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Tuesday, 4 August 2015

Very Accurate 10volt and 5volt Reference For Testing Multimeters etc. Stripboard Layout

I thought this would be a good project to keep around to see if my digital multimeter has drifted out of calibration.

I power it from a normal bench power supply but it would probably be better if you used 2 9v batteries in series.

The LED on it displays when over 100mA is being drawn from it - basically if the LED is lit disconnect it or things will be getting very hot!

I tested it in free air with open windows over 2 hours and it was very stable so I can rely on it.

Linear Tech do a few different drop references for this IC
the 2 I've tried are the 10 volt reference and the 5 volt reference
the part numbers are
10 volt reference; LT1021BCN8-10
5 volt reference; LT1021CCN8-5

it stayed at 10.0006 for over 2 hours - the least significant digit moved around but that's 10's of uVolts!