Configure the input voltage range

I use an NI USB-6221 with SignalExpress 3.0 card.

The Spec for the 6221 map specifies 4 analog input ranges of +/-10V, 5, 1, & 0.2.

My question, how is the range of input voltage on the map on one of the beaches specified?

The closest thing I can find in SignalExpress is step 'DAQmx aquire', looking at the tab "configuration" of "Configuring the stage." There is a group called 'settings', there are areas of maximum and minimum input Signal, but context-sensitive help indicates that it is expected for the channel after the scaling values.

I also looked into MAX, but I see no way for me to directly configure one of these ranges.

Can someone explain how this works?

Mike

You look at the right thing. When you specify the min and max, the DAQmx driver and then automatically selects the best range of this signal. For example, the Council supports + /. 1 + /-1, at ± 5 and ± varies from 10 volts and a jury of 12 bits. If you enter max/min to + /-2, the jury will be set to the +/-5 volt range. Your resolution is then 10 (oscillation of the total voltage) volts divided by 4096 (2 * 12).

If you were using LabVIEW, you can get the actual voltage selected range by using channel properties DAQmx AI. Rng.High and I. Rng.Low. If you specify a min and max that is less than the amplitude of the real signal is greater than the actual scale used, then you cut your input signal. DAQmx does not have an autoscale. Take a look at Page 4-2 in the Manual of the M series.

Tags: NI Hardware

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