USB 6211 measurement range

[metavektor]

Hello,

I'm curious about the USB 6211 DAQ Box's measurement range, and more specifically how it's set. In the handbook for the device a table of supported input ranges is listed here http://www.ni.com/pdf/manuals/371932f.pdf with the same information being repeated in the complete manua at section 4-3; however, in MAX and Labview the input range configuration is completely arbitrary! That is, I can enter whatever values I want into the maximum and minimum input ranges, as long as they aren't greater than 10V. Naturally I'm a bit skeptical that this steplessly variable configuration on the software side results in sensible hardware side changes. My questions are: do I have to stay one of these measurement ranges? What actually happens on the hardware side when I set the input range to something other than one of the recommended input ranges? If I set +/-250mV, is the output even sensible?

Thank you for your time and help,

Matthew Berwind

[Henrik_Volkers · Accepted solution]

The DAQmx driver accept all range values, but will check against the hardware specified and give an error , a warning or simply adapt to next higher range that fit. 

So after a configuration you can use the property node or the DAQmx vi to read back the actual range choosen by the driver.

[metavektor]

Vielen Dank für Ihre schnelle Rückmeldung!

Grüße aus dem Schwarzwald