Thermo 42i - Input Board Calibration

Operation
Service Menu
Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-87
Input Board Calibration The Input Board Calibration menu is used to initiate a calibration of the
input A/D stages. The input board calibration menu is visible only when
the instrument is in service mode. For more information on the service
mode, see “Service Mode” on page.
• In the Main Menu, choose Service > Input Board Calibration.
Manual Input Calibration The Manual Input Calibration screen is used to do a manual calibration of
the input board A/D stages.
Note The measurement system and the PMT are both shut off inside this
screen.

• In the Main Menu, choose Service > Input Board Calibration > Manual
Input Cal.
• Press to leave warning screen.
• Make a note of the frequency at gain of 1.
•Use
and to change the gain between 10 and 100.
• Use and to increment or decrement the D/A counts so
the frequency at gain 100 is equal to the frequency at gain 1.
WARNING This adjustment should only be performed by an instrument
service technician. 
INPUT BOARD CALIBRATION:
>MANUAL INPUT CAL
AUTOMATIC INPUT CAL
INPUT FREQUENCY DISP
RANGE AVG DIAGS ALARM
WARNING This adjustment should only be performed by an instrument
service technician. 