11-21-2014 05:19 PM - edited 11-21-2014 05:20 PM
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!
11-24-2014 08:37 AM
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,