Operation
Service Menu
Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-89
Input Frequency Display The Frequency Display screen is used to manually adjust the input board
gain. This may be used as a troubleshooting tool for the input board. The
gain setting and test mode are reset upon exiting this screen.
• In the Main Menu, choose Service > Input Board Calibration >
Frequency Disp.
• Press to leave warning screen.
• Use and to toggle the test signal and bypass the PMT.
•Use and to change the gain between 1, 10, and 100.
Temperature Calibration The Temperature calibration screen allows the user to view and set the
ambient temperature sensor calibration. The temperature calibration screen
is visible only when the instrument is in service mode. For more
information on the service mode, see “Service Mode” earlier in the chapter.
• In the Main Menu, choose Service > Temperature Calibration.
• Use , , and to move and change the value.
• Press to save set to value as actual value.
INPUT BOARD CALIBRATION: INPUT BOARD TEST:
TO CALIBRATE
GAIN = 1
TEST = OFF
XXXXXX** WARNING **XXXXXXX
FREQ = 5000
CONCENTRATION CALCULATIONX
§¨ CHG GAIN ©ª TEST MODE IS HALTED INSIDE XXXX
THIS SCREEN!XXXXXXX
RANGE AVG DIAGS ALARM
RANGE AVG DIAGS ALARM
WARNING This adjustment should only be performed by an instrument
service technician.
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