Current sense resistor

Picture of the current sense resistor

To allow measuring such low currents I used a regular 10k 5% resistor.


With such low currents it’s not practical to make measurements with an ammeter. My el-cheapo ammeter’s lowest division is 1uA, well above the target currents that I was trying to measure.
A 1k resistor would give 1mV with 1uA, which is still very low to measure with some degree of accuracy. So I decided to go with a 10k resistor.

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