Power Profile Kit II measures 1.5microAmps when disconnected

[vofitserov]

I'd like to use Power Profiler to measure really low currents (watches) ~0.4 microAmps. 

However, Power Profiler II measures 1.5microAmps even when disconnected with or without voltage supply.

I've tried using Advanced Settings to reduce gain for R1 but even with lowest setting (0.9) the kit measures 1.3 microAmps when disconnected.

Is there way to calibrate/reset the device to make sure it has true zero?  

 

[Andrew Lentvorski]

I presume you mean that your DUT is effectively an "open circuit" when you say "disconnected".

You cannot measure *current* into an open circuit.  Measuring current into a short circuit is also problematic.  This is not a voltmeter.

If you wish to do a quick sanity check, put a 10 Megaohm or 100 Megaohm resistor as the DUT.  This gives you a complete circuit that you can check the current on.

Hope this helps.

[vofitserov]

I've got another PPK2 from the DigiKey today. Measured disconnected circuit, got 0.1uA (broken kit was showing 1.5uA). I also measured same 101.2K resistor and got expected 7.8uA. The first kit just has some soft of the problem.