I have asked here a month ago regarding measurement of very low current.
I was told that Amper-Meters today has this resistance in series that will cause a voltage drop, hence you can't measure a very low current.

So what happened with my Fluke is a very strange thing. If I put it on the scale of **2mA**, or even **20mA**, and try to measure current in my PCB, I get many resets of the MCU because the voltage is dropping.

But I discovered something else, if I put the scale on the Ampere meter to be in **20A**, then the PCB is working and I can measure the current (!).


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So my questions are:

1. Why is it working only with a scale of **20A** ?

2. Are the measurements good? Can you count on them? I can tell that the LCD shows a curent of **0.03** in this scale, that means its about **30uA**? (that's what I expect)