Hioki ST4030, Instruction Manual, Page: 72 / 256

64
Waveform Judgments
Differential surface area comparison judgments [DIFF AREA]
Calculates the surface area surrounded by the master waveform and test waveform in the user-
designated area to judge whether the test workpiece within that area conforms.
The surface area surrounded by the master and test waveforms in the judgment area (surface area
in a solid orange color) is calculated as shown in the “Differential surface area calculation example”
below.
The judgment standards are set using percentages, and the test workpiece is judged to conform if
the percentage of the test waveform surface area over the master waveform surface area is in that
range.
Differential surface area calculation example
Judgment area
Differential surface area comparison value operation formula
Diff
(%) =
(Test waveform surface area value − Master waveform surface area value)
Master waveform surface area value
* 100
Enabling the differential surface area comparison judgment function
(Measurement screen) [MODE] > [SETTING] > [JUDGE] > [DIFF AREA]
1
1
Tap [ENABLE] , and turn [ON] the differential surface area comparison judgment function.