µCurrent in nA range

[jancumps]

When I use my µCurrent in the nA range, I get a result I 'm not expecting.

I'm measuring current through a 3M6 resistor powered by 15V.
This should result in 4.13 nA
I measure a voltage drop of 41.2 mV over the current input , but the output of the µCurrent is 1.356V
In the µA range, the output is 4.1 mV for the same setup

I've used a freshly opened 2032,  (shelf life July 2022). Battery light is on.
I'm measuring the voltages at the backside of the PCB directly on the PCB traces of the µCurrent connectors.

I wonder what I'm doing wrong? Am I measuring outside of it's range?

[JohnnyBerg]

if your input voltage is 41.2mv then the output would be 41,2 x 100 = 4,12V. This is impossible, due to the fact the battery is 3V

So, there must be something wrong on your input. Either you are putting the wrong current into it, or your input shunt resistor is defect.

[jancumps]

You're right. I was a full order of magnitude off. Forgot that there's mA befor µA. Go figure.