DAQmx read - the values on the scale or not? Binary conversion.

Hey everybody,

I had a question regarding making the scale and the release of Renault. I use LabVIEW 2009 SP1, with a pilot DAQmx 9.0.2 and a X-Series card. I'm reading the data my DAQ and store it in a binary file.

How is the acquisition of data read samples, in General? that is if I select NSamp NChan I16 2D Analog on my DAQmx Read, what kind of values can I expect if I was at the exit of the probe data? (Suppose I have readings in mV values and my overall fork's 04:55 V.) When he wrote in the binary file, what happens, what can I expect to see in terms of values - or maybe just descriptively?

Overall, a little insight would be very helpful. I tried to troubleshoot asymmetric readings I received, so this will help me immensely.

Thank you.

Hi Matt87,

Reading data as I16 will return the result adjusted, not calibrated for 16-bit ADC.

If you want to write your own binaries, you'll want to include scaling of device - for series X, coefficients a 3rd order polynomial.

Here are two examples that show how write to a binary file and read the data back.  In this example, scaling coefficients are stored in the file header:

Continuous gain and voltage drop (binary) chart

Graph of the acquired binary data

That said, I would recommend that you look in the record feature integrated TDMS introduced in DAQmx 9.0.  The result is a file appropriate binary .tdms which is a standard format that can be opened in LabVIEW or in several other programs with the plugin.  See the following examples for how to use the function:

Streaming data and log to the PDM file

Continuously to log in a PDM file data

The second example does not force you to read the data in the memory of LabVIEW and use the minimum CPU.  The first example allows you to see the data that is acquired.

Best regards

Tags: NI Hardware

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