Veeco MS40, Operation And Maintenance Manual, Page: 48 / 169

Vacuum Instrument Corp.
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4 To display D2 through D7 , continue pressing the same SELECT
momentary switch; the indicator light will not move to the next
function (in this case, EMISSION) until all seven delay
parameters have been cycled. When the desired delay
parameter appears in the alphanumeric display, it can be
adjusted as in
Step 3.
2.8 Setting Additional Parameters
Amplifier Gain
When this function is selected, the alphanumeric display indicates the gain
setting of the leak rate amplifier (from 0.1 to 10.0). The amplifier gain is
the multiplier used by the computer to compensate for changes in
sensitivity of the mass spectrometer. The user will only use this function
when calibrating using a known external leak source or when unable to
otherwise properly calibrate the unit.
Five separate gains are available:
G1 refers to the gain while the unit is in gross flow mode
G2 refers to the gain while the unit is in reverse flow mode
G3 refers to the gain while the unit is in direct flow mode.
G4 refers to the gain while the unit is in sniff mode.
G5 refers to the gain while the unit is in power sniff mode.
To alter the Amplifier Gain settings:
1 While in Service Mode, press either SELECT key on the User
Panel until the indicator light beside AMP GAIN is illuminated.
Continuing to press the same SELECT key will display each
gain parameter (G1–G5) in sequence before the indicator
moves to the next function (in this case, ANODE VOLT).
2 When the desired gain parameter is displayed, press either the
left or right SET key to decrease or increase the Amplifier Gain.
NOTE
G1 (Gross Mode gain) may be set in the Standard mode when
the MS-40 is leak testing in gross and sniff mode range.
1109-186-00 Rev. C 2-31