Data chopping in Labview Express

[Aaron93]

When I use a custom scale to display the output from 2 pressure devices that I am reading, the data gets chopped at 750 kPa. When I read the data with no scale (volts), the data is not chopped. The output of the transducers is about 2.4 VDC @ 750 kPa, and I have terminal configuration set to differential mode. Any ideas?

Ni USB 6008

[Steve_B]

Hi Aaron,

I have taken a look into you issue and based on the information you have provided this issue could arise because you are working with a custom table scale. The data must fit within the bounds of your table because your scale will not be extrapolated. You can expand your table scale beyond 750kPa to your maximum or change to a polynomial scale if you can create a function to represent what you have in your table. You also have to make sure that you are setting the correct limits for your scaled units in your DAQmx task.

You can export your scale and post it if you are still having issues. The following link will show you how it can be exported.

Saving the System Configuration in Measurement & Automation Explorer (MAX)
http://digital.ni.com/public.nsf/allkb/0E0D3D7C4AA8903886256B29000C9D5A?OpenDocument