DAQmx custom scale: How do you define minimum and MAXIMUM values?

Hello everyone,

I am currently using LabVIEW 2010 and meet the following problem with DAQmx custom scale: first, I created a custom linear scale (ordered originally = 0, slope = 50) and then a string that uses this scale. The real signal acquired from a NOR-9205 (module I) is in the order of-8 / + 8 Volts; When I try to read the measurement of the chain, it seems saturated.

I discovered that the change HAVE. Max and the AI. Min by a DAQmx channel property node I can improve the situation, but the fact is: I was not able to define a range of-1000 / + 1000 for instance because it exceeds the maximum allowed, and I get an error!

So, it is the custom to scale?

No one knows how to fix?

It seems not to be any possibility of having a large scale factor! If I want to convert 1V 1000V I will never reach it!

Thank you much for the help.

B.

Hello

The custom scale will be the function that converts the voltage to some units, you can.  If you use a linear scale, it is in the form:

Data units user = m * wine + b

where m is the slope and b is the intercept at the origin wine is what happens to the analog input channel.

The MIN and MAX define you are the min and min AFTER the scaling.  So if you want 1 volt in Ain channel to appear as 1000 in the code, you:

m = 1000, b = 0

Then your MAX and MIN is limited to-10000 and 10000 when DID channel lies between +-10V.  By selecting a MAX or MIN outside this range will cause an error and numbers read apart from this will be so much saturation.

9205 a selectable ranges: ±200 mV, ± 1, ± 5 and ±10 V programmable input ranges.   I haven't used the 9205 so I don't know if this range is automatically selected or the user defined in the module preferences.   Whatever it is, it will have a possible effect that MAX and MIN are.

For example.

If you did what you said and used slope = 50 and intercept = 0 AND you got the system set to ±10 volts, while the MAXIMUM and minimum that you can set are limited to ±50 * 10 = ±500.   So if you try to put a maximum of 1000 in there, you will get an error because it needs to be at + 500 to-500.   Your saturation occur at ±10 volts (what is scale ±500)

If the interval is set to +-1 volt, your MAX and MIN should be within-50 to + 50.  All values apart from this will produce errors.  and if you try to read voltages above + 1 volt (+-50 scaling), there will be saturation.

I hope it is clear and useful.

-Alex-

Tags: NI Software

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