Testing NI-9265 Analog Output

[Greg_Reynolds]

I'm testing output of a NI-9265 4-20mA current output using MAX.  The unit passes self test, and now I'm checking voltage across the channel with a 240ohm shunt resistor in place, say between AO0 and COM0.  When running MAX to generate a DC Value, ant say 10mA, I should see about 2.4VDC on my DMM (across the resistor), but I don't.  The DMM reading is less than 1mV.  What's wrong with my approach? 

[smercurio_fc]

Have you connected an external power supply?

[Greg_Reynolds]

Negatory! 

[smercurio_fc]

Well, there's your problem.

Doesn't work without one. See the documentation on the module. 

[Greg_Reynolds]

Ok, now things are as expected.  Thanks much for your help.  I  noticed the Vsup terminal and didn't stop long enough to think about it!  Should the COM terminal be grounded on the power supply?