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FUNCTION REFERENCE 5 - 71
SUBTRACT (MATHEMATICS)
The subtract mode is available in the digital mode of operation.
Description:
The SUBTRACT function performs a point-to-point subtraction of two traces.
Each point related to the respective ground levels (indicated as ‘-’). The result of
the SUBTRACT function is a new trace in a different register. This trace can be
scaled and positioned.
Scaling
is the correction of the resultant trace to fit in the screen. Scaling can be
adjusted by using the TRACK control.
Vertical positioning
is called offset. It offsets each sample in the resultant trace
with a certain value so that the trace can be "moved" vertically. It is adjusted with
the ∆ control.
The scale factor and the offset factor are displayed in the ‘MATH SCALE’ menu.
Pressing the ‘autoscale’ softkey automatically selects the settings for the trace to
fit the screen.
When subtracting signals with different amplitude settings, the size of the smaller
signal is automatically adjusted to match the size of the larger signal.
Newly acquired traces or previously stored traces can be used as the source for
this process and can be selected with the ∆ control. The resulting trace is
automatically written in a register memory (m1 for math1 or m2 for math2).
To see the result more clearly, you can turn off the two source traces by pressing
the ‘DISPLAY SOURCE on/off softkey’.
Mathematical description:
Result = S1 - S2