I want to increase the range of the current that my program can measure.

I have NI-DAQ 6024E and CB-68LP connector.I'm using pins 68 & 67 for input current that is to be measured.It somehow reads 20 mA when it's 200 and 30 mA when it's 300!! Also please tell me how can I increase the current range that can be read by this program and hardware as it currently reads upto 500 mA and I need to read upto 1 A.

Hi Mark, basically if I connect the terminals of my valve to ACH0 and ACH8,then it'll be a parallel connection.Here surely I'll get the voltage to read and i can divide by my resistance to calculate the current, but I dont want to do that.That is possible even with a regular calculator.Here I have a program that reads current directly but somehow I'm not able to read proper current.And my valve is a current controlled device so the more current I pass through it, more does it open.Now with the attached program,I want to know how to exactly wire my valve with the CB-68LP connector so that I can read the current.Please also suggest me how exactly to put the resistance in the circuit.
Attachments:
cont_current_meas.vi ‏58 KB

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