Operation
Service Menu
Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-83
PMT Voltage Adjustment The PMT Voltage Adjustment screen is used to manually adjust the PMT
supply voltage. The PMT voltage adjustment screen is visible only when the
instrument is in service mode. For more information on the service mode,
see “Service Mode” earlier in this chapter.
• In the Main Menu, choose Service > PMT Voltage Adjustment.
• Use and to increment or decrement the PMT counts.
• Press to save the new PMT voltage.
Range Mode Select The Range Mode Select screen is used to switch between the various range
modes: single, dual, and auto range. The range mode select screen is visible
only when the instrument is in service mode. For more information on the
service mode, see “Service Mode” earlier in this chapter.
• In the Main Menu, choose Service > Range Mode Select.
•Use and to scroll through a list of choices.
•Press to save the new range mode.
WARNING This adjustment should only be performed by an instrument
service technician.
SET PMT VOLTAGE:
SET PMT: 750.0 V
COUNTS: 2254 ?
©ª INC/DEC
SAVE VALUE
RANGE AVG DIAGS ALARM
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