Veeco MS40 Operation And Maintenance Manual page 24

ANODE VOLT
CAL TEMP
VIC Leak Detection
2099 Ninth Avenue
Ronkonkoma, NY 11779
631.737.0900
1109-186-00 Rev. C
Service or Standard Modes. Note that G1, G4 and G5 are not
controlled by the MS-40 and must be set by the user. G1 may
be set by the user when the MS-40 is leak testing in the Gross
Mode, or when the unit is in the service mode. G4 and G5 can
be set when the unit is in sniff testing mode.
Anode Voltage. When this function is selected, the
alphanumeric display indicates the anode voltage of the unit.
In Service Mode, the anode voltage may be altered
incrementally by pressing either of the SET momentary
switches. Note that the other peak voltages associated with
the mass spectrometer follow the anode voltage setting;
therefore the MS-40 can be manually tuned by changing the
peak voltage.
CAUTION
Only qualified personnel should attempt to alter the anode voltage
setting while the unit is in Service Mode. As stated above, altering
the peak tuning voltages will retune the mass spectrometer. Improper
tuning will greatly effect the accuracy and reliability of the leak
detector.
While the unit is in Standard Mode, pressing either the left or
right SET momentary switches adjusts the unit's peak tuning
voltages either -30 or +30V. This function, unique to
VIC's MS series of leak detectors, is referred to as peak scan
and is used to quickly verify if the mass spectrometer is
properly tuned (refer to Section 2.9 for further information on
the Peak Scan function). Releasing either momentary switch
returns the anode voltage of the unit to its original value.
Calibrator Temperature. When selected in Standard Mode, the
alphanumeric display will indicate the current temperature of
the calibrator. When selected in Service Mode, the
alphanumeric display will indicate the temperature at which
the internal helium reference standard was originally
calibrated. This parameter may be altered in Service Mode
(using the SET pushbuttons), however, this setting should
not be altered unless a new calibrator is installed in the unit.
2-7