pxi-4110 minimal current steps in current source mode

[asuwish4]

Not sure this is on the right board but here goes...

I have a PXI-4110.  I am using the Channel !, +20V supply running in constant current mode.

I need to adjust the output across 250k Ohms so that I read 10V across the resistor.  (40uA)

Using the soft panel, I have the supply set correctly (I'm using the 20mA scale) but can't seem to get down that low.  Couldnt adjust it below 200uA.

I'm thinking I may need a different card for this application or am I just missing something?

Thanks!

Charlie

[Izzzzz]

Hello Charlie, 

The reason why you cannot adjust it below 200uA is because this is the lowest settable current value for this device. This value is specified in the NI DC Power and SMU Help (Windows Start>>National Instruments>>NI DC Power>> Documentation>> NI DC Power and SMU Help>>Devices>>PXI-4110>>Operating the Device>>Ranges) and displayed in the image below. You could specify the DC Voltage and measure the current to ensure the accuracy. Although if you wish to directly specify the current at this value then I would recommend the PXI-4132,  or PXI-4130.

Regards,

Izzy O.

Applications Engineer

National Instruments

www.ni.com/support