Multifunction DAQ

cancel
Showing results for 
Search instead for 
Did you mean: 

How to use a bias resistor for a NI USB-6289 properly?

I am currently using a NI USB-6289 to collect voltage measurements. I am trying to take a differential measurement and believe I am out side the range of the DAQ. I am using a Wheatstone bridge and have zeroed out the bridge to about 60 micro volts using a multimeter. I am correctly measuring the voltage from the voltage source, but I am not collecting the differential voltage correctly. I am not sure if I am understanding the limits of the DAQ. I have been told to use a bias resistor. I am not sure exactly how to set it up and was wondering if this would help me collect measurements that are outside the capabilities of the DAQ??? Any suggestions would be appreciated.

0 Kudos
Message 1 of 2
(2,927 Views)

Hello Spiderwebhigh,

Assuming that you are using external excitation for your circuit, what kind of source is providing the excitation? Depending on whether it is a grounded or floating source determines the type of measurement you should take.

In general the Developer Zone Tutorial: Field Wiring and Noise Considerations for Analog Signals is the best resource for determining wiring requirements for a given signal. Take a look at it and post back any questions.

Regards,
Dan King

0 Kudos
Message 2 of 2
(2,896 Views)