Hi guys,
I am using a NI USB 6341 DAQ.
The Issue at hand is I have to measure currents which are small mA range.
But the current flows because of difference between DC voltages which range from 12 to 24 VDC.
So I connect my Supply Line (12 to 24 V) to AI Sense a Shunt(100 Ohm) and then the AI1 Signal Input. and measure in NRSE mode.
the Signal is grounded as we see.
Problem: a) I can only measure the current if the signal is in between +- 10V(thts also right as its in Datasheet).
b) What I expect from AI Sense is that a Floating Line without any reference to AI ground.
The AISense always has a potential with respect to the AI gnd Irrespective of the source.
Also the DAQ has an Issue (I will make another thread for it) the GND Digital, Analog are connected to Earthing..
What could be a work around without H/W changes in the Circuit board and a new DAQ device.
regards
Akshay
