Using NI 9207 to gather 0-20V sensor data

[ZeUs87]

Hello all,

I am purchasing NI 9207 for my CDAQ NI 9178 chassis. I intend to use the NI9207 for collecting data from a hot film (similar to hot wire anemometer) that outputs 0 to 20V signals. My confusion is that NI 9207 is advertised to work for -10 to +10V signals.

Even though the total advertised range is 20V, I am not sure if that will work for my sensor. If it does, is there a software setting that needs to be adjusted from LabVIEW environment to make this happen -> -10 to 10V to 0 to 20V?

Thanks a lot for the help.

[Henrik_Volkers]

Well after a little RTFM I found mentioned in the Specifications:

Maximum working voltage for analoginputs (signal voltage + common modevoltage), voltage channels only:

Each channel must remain within ±10.2 V of common

However, IF your voltage output is a floating source , you can try to use a differential measurement and apply a 10V source between AI- and COM.  Another way, IF your source is low impedance AND floating: Try two 1M resistors  in series between AI- and AI+ and tie the center junction to COM (but check not to run into saturation due to not free floating source!)