Veeco MS40, Operation And Maintenance Manual, Page: 23 / 169

VENT
Dual function pushbutton. When pressed momentarily, the
MS-40 is interrupted from its current testing cycle and placed
in standby (wait) mode. The green READY indicator will
light. When pressed and held for a preprogrammed time (as
programmed by the user; factory default is 0.5 second) the
pushbutton initiates an AUTO-VENT cycle and returns the
test port to atmospheric pressure. The delay may be
programmed for up to 999.9 seconds.
ON/OFF
Turns the MS-40 ON or OFF.
The following Controls & Indicators are accessible from the Service
Panel (the left half of the panel at the top front of the unit). Items are
listed from left to right, top to bottom (see Figure 2-1 for an illustration
of the Service Panel).
SERVICE MODE INDICATOR
When lit, the MS-40 has been placed in Service Mode. The
unit is placed in Service Mode by pressing the Service Mode
Interlock button located on the upper right side of the “A” circuit
board, mounted on the inside of the unit’s rear door.
AMP GAIN
Amplifier Gain. When this function is selected, the
alphanumeric display indicates the setting of the leak rate
amplifier (1.0 to 10.0).
Five different gains are used on the unit. The first, G1 ,
is used for the unit’s gross flow mode; the second, G2 , is
used for the unit’s reverse flow mode and the third G3 , is
used for the unit’s direct flow mode. G4 and G5 are used
for sniff mode.
The five different gain settings can be displayed using
the SELECT momentary switches when the AMP GAIN
function has been selected. Gain (calibration) of
the MS-40 is changed by the SET momentary switches.
Normally G2 and G3 are set automatically by the
MS-40 during a Tune and Calibration cycle, however
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the G2 and G3 settings can be manually altered in
Service Mode. The actual setting may be viewed in either
1109-186-00 Rev. C 2-6