Measuring amps changes circuit behaviour

[asuryan]

Thanks for your replies!

@MarkT

Which current range are you using?

Im using an autorange multimeter set to uA.

@MarkT

Auto-ranging meters are a nuisance for this kind of reading BTW.

I suspect that could be the problem then

@MarkT

As an alternative try putting a 10 ohm resistor in series with the supply and measure the voltage across this with your meter. Then you know the burden resistance is small.

Okay so classical ohms law calculation with the value measured over the small resistor?