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Testing of Constant Reference Voltage Mode

A project log for High Dynamic Range Precision Current Supply

An open source isolated precision constant current supply from 10nA to 400mA, particularly helpful for calibrating MetaShunt power profiler

jake-wachlinJake Wachlin 4 hours ago0 Comments

To evaluate the performance of this device, I started with connecting it up to a MetaShunt V2, without prior calibration of anything except the highest 2 current shunts of MetaShunt V2.

The table below compares the expected current (from the design), compared to measurements from MetaShunt V2. The images below also show these results. Overall, the expected and measured current matches very well, all within 1% or better. Future testing will show the reliability of the current supply as a reference truth.

Expected CurrentMeasured with MetaShunt V2% Error
300nA302nA-0.66%
3.30uA3.30uA0%
30.3uA30.3uA0%
300uA300uA0%
3.00mA3.00mA0%
30.0mA29.7mA1.0%
234mA233mA0.4%
389mA393mA-1.0%

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