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5.1 Overview
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5.1 Overview
The comparison function is divided into "Area comparison" and "Value
comparison." Area comparison compares the shape of a waveform. Value
comparison compares the numeric data in a waveform. Both comparisons
can be used at the same time.
Also available is "Waveform Calculation," which handles the addition,
subtraction, multiplication, and division of stored waveforms between
channels. When waveform calculation has been performed, the operation
results are subjected to area comparison and/or value comparison.
(1) Area Comparison (See 5.3 and 5.4)
The shape of a stored waveform is compared to determine acceptance.
Checks whether the waveform is within or outside the "Comparison area"
(i.e., range of an acceptable waveform).
In area comparison, the waveform is compared by the pixels (dots) on the
screen. The waveform displayed on the screen is compared regardless of
recording length.
A comparison area may be created using an acceptable waveform. The
8730-10, 8731-10 can store up to 16 areas in memory. The areas can be
also stored on a PC card.
Depending on the comparison results, signals are output from the OK
terminal or NG terminal of the external control terminals. (See 8.5.2 for
details.)
(2) Value Comparison (See 5.5)
Performs value calculations for a stored waveform and compares the
results. Checks whether a calculation result (value) is within or outside
the set range of the upper and lower limits.
Value comparison is made on all areas of a measured waveforms for the
recording length, including the portion not displayed on the screen.
A range for calculation can be set. (See 5.5.4 for details.)
Depending on the comparison results, signals are output from the OK
terminal or NG terminal of the external control terminals. (See 8.5.1 for
details.)
(3) Waveform Calculation (See 5.6)
Performs calculation (i.e., four basic arithmetic operations) for a stored
waveform.
Waveform calculation is performed on all areas of a measured waveform
for the recording length, including the portion not displayed on the screen.
Both area and value comparison are made on the waveform obtained by
calculation.
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