Defining a linear custom scale in Daq Assistant Labview 7 express

[mjhill]

I have come accross a strange bug and am wondering if anyone else has encountered this before, I am reading from a 4-20mA current module and want to view the output in percent, i.e. 4mA is 0% 20mA is 100%. When defining the custom linear scale in Daq assitant I used a slope of 6250 and a y intercept of -25, which theoretically is correct. However, when I run the code with an 8mA input I'm reading 0.1% output. If I change the slope to 6225, I get an output very close to 25%, however I can't run the code with a slope higher that 6225 without getting erroneous output. Is this a reported bug? I'm not sure how to trust the scaled output from Labview if this is the case.

Thanks,

Mike

[sergesl]

Hello Mjhill,

I did the same using voltage. I output on one channel, read it back on another channel and using the scale you gave, I did not have any problem. Can you try doing it this way to see if you still see a problem with your scale?