Use the Evaluation > Derivative command to calculate the derivative (differential) of the active curve.
A new curve is created according to the following formula:
y(n)’ = { y(n) - y(n-1) } / { x(n) - x(n-1) }
x(n)’ = x(n)
where n = 1,2,3....
Derived curves are identified with (dy/dt) (or (dy/dx) in the X/Y graph).
Use the Scaling > Optimize Graph command to optimally scale the new curve.
If a curve was recorded at a higher sampling rate than the actual cycle time, please remove the oversampling first. Since the difference between oversampled values is 0, you will otherwise get a flat line. Removing oversampling
You can differentiate curves that have already been derived, in order to receive higher-order derivatives. Please note that direct recording of higher-order derivatives is not possible. Such curves are automatically removed when recording starts or during channel selection.