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 dropout ,hence you cant measure a very low current .

So whats happens with my fluk 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 dropped .

But i discovered something else,if i put the scale on the Ampermeter to be in **20A** , than the pcb is working and i can measure the current (!).

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 current of **0.03** in this scale, that means its about `30uA` ? (thats what i expect)