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Grouped to the right of the Service Mode Indicator are a series of LED
indicators. The Service Mode allows the setting of the unit's Amplifier
Gain, Anode Voltage, Calibration Temperature and Internal Calibration
Value in conjunction with the arrow buttons and LED alphanumeric
display to the right of the indicators. Additionally, the user may view the
unit's calibration temperature, the emission current of the filament within
the unit's spectrometer, the error code present (indicating a possible fault
within the unit), the current supplied to the filament in the
-8
mass spectrometer, the calibration standard (e.g., 2 x 10
std cc/sec @
24°C) of the internal calibrator, the leak rate of the test object (a numeric
value - the same leak rate as displayed by the bar graph on the User
Panel), the pressure measured at the test port and the total number of
hours the unit has been in operation.
Below the indicators and to the right of the valve controls are two sets of
momentary switches. In either Standard or Service Modes, they allow the
User to turn on/off the filament within the mass spectrometer, choose
between two different filaments within the spectrometer, and perform an
actual test on the calibrator or optimize the mass spectrometer. When
strictly in Service Mode, the User is also able to choose between either a
helium or air standard for leak rate measurement or choose whether the
MS-40 will measure either with Mass 3 or 4 helium.
Vacuum Instrument Corp.
2099 Ninth Avenue
Ronkonkoma, NY 11779
631.737.0900
1109-186-00 Rev. C
1-13
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