Calibration & Tuning - Veeco MS40 Operation And Maintenance Manual

To perform many of the service and/or repair procedures described in this
chapter, the MS-40 will have to be placed into its Service Mode. To place
the unit in Service Mode:
To return to the Standard mode, press the SERVICE pushbutton a second time.
The Service Mode indicator will be extinguished and the MS-40 will return to
its normal operating mode.
4.3
The MS-40 may be tuned and calibrated automatically or manually. The
automatic (computer assisted) procedures follow:
With the unit in "standby" mode, use the following procedure to calibrate the
leak detector:
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1. Open the rear panel of the unit (loosen the 1/4-turn screw at the
top of the panel, then gently lower the door).
2. A circuit board is mounted on the inside of the rear panel. On
the right side towards the top of the board a black pushbutton is
found. Press the pushbutton. The unit is now in Service Mode
and the Service Mode indicator on the unit's front panel is
illuminated.
NOTE: After exiting from the Service Mode, the MS-40 requires
fifteen seconds to accurately acquire background and other system
measurements. During this time, the system computer will prohibit
any testing from occurring and the system will "beep" whenever the
Start switch is pressed. At the end of this fifteen-second time period,
a test cycle may be commenced normally by pressing the Start switch.
Calibration & Tuning
1. Press the CAL CHECK momentary switch. The unit will begin
the "calibration check" sequence.
2. The MS-40's computer will sequence the vacuum system so
that:
a. the internal leak rate standard is connected to the test
port
b. the internal leak standard is then measured by the unit
c. the background helium is then subtracted from the initial
measurement
d. the results of the measurement are then displayed on the
leak rate bar graph and numeric display of the user panel
4-2