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7 Operations Listed By Purposes
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3.3 Setting Fixed Compensation
Fixed Compensation is used when environmental conditions are stable. It is recommended to use after
verifying the environmental conditions are stable using Drift Compensation feature.
Enter a compensation value which is subtracted from the measured data.
The feature is disable as default.
1) > Main Menu > Comp > Fixed Comp. Settings
2)
Enable Fixed Value Comp.
3)
Enter a comp value to Fixed Comp Value
3.4 Use Mastering Comp with Drift Compensation
When both Mastering Comp and Drift Comp feature are Enable (Number of samples must be set 2 or larger.),
the Mastering value obtained by the Mastering value sampling is used as the initial compensation value for
Drift compensation in a normal leak test. The compensation value for the second test is the mean value of
the Mastering value and the raw data of the first test. If the number of the samples is set to 3, the running
average of the latest 3 measured raw data is taken as a compensation value for the fourth test, so that the
system learns to update the compensation value continuously.
1st test
Displayed value = 1st raw data – {Mastering value}
2nd test
Displayed value = 2nd raw data – {(1st raw data + Mastering value) / 2}
3rd test
Displayed value = 3rd raw data – {(2nd + 1st raw data + Mastering value) / 3}
5th test
Displayed value = 5th raw data – {(4th + 3rd raw data + 2nd raw data) / 3}
3.5 Setting Noise Reduction
Noise ratio over measurement increases when leak limits are
lowered and/or test time is shortened, which may be a cause
to increase false rejection of good parts.
In order to reduce the false rejection, Noise Reduction (NR)
feature eliminates the noise by repeating the DET stage
when the measured differential pressure falls in the
previously set uncertain judgment region.
This feature is useful where there is a high percentage of
noise presence caused by temperature or volume changes.
It helps obtaining more critical judgment.
DET UL/UL2
Pass
DET LL/LL2
Fail
Fail
Pass
an uncertain area
an uncertain area
NR Stage
Leak test
DET UL2
DET UL
DET LL
DET LL2
+
+
-
-
0
Differential Pressure
