Veeco MS40, Operation And Maintenance Manual, Page: 49 / 169

Vacuum Instrument Corp.
2099 Ninth Avenue
Ronkonkoma, NY 11779
631.737.0900
G2 and G3 are normally set by the unit’s computer so it may
properly calibrate the unit. When in Service mode, if the
operator changes the gain, the calibration will no longer be
correct. However,
G4 and G5 are always set by the user.
Anode Voltage
Displays the anode voltage of the mass spectrometer source. When this
function is selected while the unit is in Standard Mode, and then
subsequently pressing either SET momentary switch, the Peak Scan
function will be activated (see below). When the unit is in Service Mode,
pressing either of the SET switches alters the unit’s peak voltages and
allows the user to manually tune the mass spectrometer.
Helium/Air Measurement
This toggle switch allows the user to select either air-equivalent or helium
leak rate readings. This function is only available in Service Mode.
Mass 3/4 Helium
This toggle switch allows the MS-40 to switch between Mass 3 and Mass 4
tuning voltages. This function is only available in Service Mode.
2.9 Test Aids & Procedures
Using the Handheld Remote
The controls and indicators of the Handheld Remote include the leak rate
measurement displays, ranging functions, and the Start and Vent
functions. The remote itself is physically attached to the unit, via a coiled
cable that is connected to the Remote Port, located below the rear panel of
the leak detector.
The remote is automatically activated when connected to the Remote Port.
Note that use of the handheld remote does not in any way effect usage of
the User Panel nor the remote computer (if installed).
1109-186-00 Rev. C 2-32