Vacuum Instrument Corp.
2099 Ninth Avenue
Ronkonkoma, NY 11779
631.737.0900
HIGH VACUUM
The alphanumeric display indicates pressure in the high-
vacuum section (the area surrounding the filament within the
spectrometer housing). If the unit’s filament has been turned
off, the display will state OFF, otherwise the display
indicates the high vacuum pressure in either Torr or bar. The
selection of units to be displayed is made by a blue toggle
switch located underneath the Service Panel. The switch is
accessed by opening the front panel and is mounted on the
circuit board located directly under the Service Panel. If the unit is in
Standby mode, the alphanumeric display will occasionally display
“MS-40”. When this occurs, the unit is checking system offsets and
not measuring Hi-Vac pressure.
INT CALIBRATOR
Internal Calibrator. In Service Mode the alphanumeric display
indicates the leak rate value stored in the unit’s computer for
the internal calibrator. This parameter may be altered only in
Service Mode, by using the SET momentary switches. This
parameter should only be changed when the internal calibrator
has been replaced. Note that when the unit is in Standard
Mode, this function will display the current temperature-
compensated value of the internal calibrator. This parameter
may not be changed, since this value is derived from the leak
rate value of the internal calibrator.
LEAK RATE
The alphanumeric display indicates the actual current leak
rate. Measurement is in either std cc/sec or millibar liter/sec.
REJECT POINT
The alphanumeric display indicates the programmed leak rate
value for the Reject/Accept indicator (the set point that
indicates if the test object is below the maximum acceptable
leak rate). This parameter may be altered only in Standard
Mode, by using the SET pushbuttons. In Service Mode, this
function is used to indicate the speed of the turbo-molecular
pump (the alphanumeric display indicates the percentage of
the pump’s rated speed).
1109-186-00 Rev. C 2-11
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