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3. Display Description and operation Procedure
21
3.4.5 Calibration
To perform an accurate calibration make sure that the instrument is
acclimatized to the ambient temperature of the place where the calibration
work is performed. (Leave the instrument for at least 20 minutes.)
An accurate calibration cannot be performed without sufficient warm-up
operation
To calibrate the instrument
→
Refer to
2.4 Calibration
.
Before starting calibration, perform cleaning. Leave the rubber cap on the
inlet.
Move the sensitivity check knob to the “ZERO” side.
Perform the background adjustment first followed by the sensitivity
adjustment.
Press [
▲
] [
▼
] keys to move the cursor to the item to be set, and then
press [SET] key to configure the setting.
BACK GROUND: Background Adjustment
SPAN CALIBRATION: Sensitivity Adjustment
To go back to the MENU screen before completing the setting, press
[MENU] key.
<Background Adjustment>
To perform the background adjustment
Press [START/STOP] key to start a measurement.
A measurement will be performed for 6 seconds. During a measurement
the instantaneous value of the background (CPM) will be displayed.
The remaining measurement time will be displayed on the bottom of the
display.
When a measurement is finished, the average background value (CPM) at
the time will be displayed.
To perform the background adjustment with this value, select SET. If not,
select CANCEL.
Press [
▲
] [
▼
] keys to move the cursor, and press [SET] key to configure
the setting. After the adjusted value is displayed for about 2 seconds, the
unit will go back to the CALIBRATION screen.
[START/STOP] Key
The measurement will
finish in 6 sec.