The characteristic curve scaling is used to scale the recorded signals in real time on the measurement card. The scaling takes place directly on the signal processor of the measurement card and therefore does not require any computing power on the PC side. The characteristic curve scaling on the measurement cards of the Multichoice PCI and USB series is only available with the “Online linearization” option enabled. The characteristic curve scaling is set in the measuring program via settings of the analog acquisition block. This transfers a list of the support points to the DSP, which describe the signal scaling. The scaling takes place on the entire set voltage range. The definition of the support points takes place in a separate text file in which the corner points are simply stored line by line.
To enable scaling, (2 exp. X) +1 corner points are required, whereby 0 If fewer coefficients are selected than are available in the file, the following values are ignored.
The coefficient files can be created very comfortably, for example with Excel, and saved as a text file. The point “.” Is used as the decimal separator. used!
An example of a coefficient file:
The number of points given is 5 ((2 exp. 2) +1)
In the example, when the input voltage range is set from -10 to +10, the recorded measured values are scaled as follows according to the definition of the output range:
-10 to -5V -> 0 to 1V
-5 to 0V -> 1 to 5V
0 to 5V -> 5 to 6V
5 to 10V -> 6 to 10V