Veeco MS40 Operation And Maintenance Manual page 21

REJECT
READY
AUTO/MANUAL
RANGING
AUDIO
Vacuum Instrument Corp.
2099 Ninth Avenue
Ronkonkoma, NY 11779
631.737.0900
1109-186-00 Rev. C
During leak testing, this indicator will illuminate when the leak
measured is greater than or equal to the programmed reject
rate (or maximum acceptable leak rate). The reject rate is
set by the user from the Service Panel (see Section 2.7).
When lit, the unit is in standby mode (all valves except the
Fore-line valve are closed). Pressing the START pushbutton
commences a test cycle.
Automatic/Manual Ranging. Prior to and during leak testing,
this momentary switch allows the user to toggle between
Automatic and Manual Ranging modes.
While leak testing in Manual Ranging mode, each press of
either the up or down arrow buttons will cause the unit to leak
test in the decade (or range) above or below the current
decade being tested (pressing and holding either arrow button
will cause the unit to sequentially pass through one or more
decades). The numeric display (the exponent of the leak rate)
will indicate the change. Also, when leak testing in the
automatic ranging mode, pressing either arrow button will
force the unit to test in manual ranging mode, at a decade
higher or lower than the decade previously being tested
(corresponding to the arrow key pressed).
During actual testing and while in service mode, the audio
signal of the unit is always turned on. The arrow keys
dedicated to the Audio section of the panel control the
volume. Pressing the down arrow key several times (or
pressing and holding the down arrow key) reduces the volume
to an inaudible level. Note that this function is also available
when using the optional headphones. A connector for a set of
headphones is located under the bottom rear panel of the unit.
2-4