NI PXI-2503 MUX 1-Wire Use

[testdesign]

Hi everyone,

I am using the NI-2503 MUX and feeding in a 5V signal into CH0- which then outputs to COM-.  Do I have to use the 1-Wire Lo Ref line for a common reference?  I am feeding COM- into my DMM HI and my DMM LO gets fed a COMMON GND in my external test fixture.  Do I need to use the 1-Wire Lo Ref line for a common reference or can I just pass through the signal on CH0- into my DMM HI input and use a common gnd reference from an external test fixture fed into my DMM LO input.

Thanks so much!

[Roohcifer]

Hello,

If you're going to take single-ended measurements, generally we use th CH+/COM+ channels for the voltage of interest and send the ground through the 1-Wire Lo Ref, which remains connected to COM-.  That said, so long as your DMM Lo is connected to the same common ground as your 5V signal, you should be fine in terms of your measurement. 

Regards,