Varian 959D, Operation Manual

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959D Leak Detector
2-2
DRAFT
9/13/02
2.1.1 Primary Controls and Indicators
The primary controls are shown in the front panel drawing of Figure 2-2.
\
Figure 2-2 959D Primary Controls and Indicators
➃
VENT button Lights when pressed to vent the test port to atmosphere.
➄
HI VAC OK Green LED lights when operational vacuum is reached in the spec-
trometer tube. Remains lit until vacuum condition is lost.
➅
PRESSURE
indicator Horizontal bar graph that displays test port pressure in milliTorr.
➆
FIL Indicator Green LED indicating that the spectrometer tube filament is turned
on and emission is present.
➇
OVER range LED at top of pressure bar graph indicates an over-scale condition.
See Section 2.4.2 “Out-of-Range Situations” on page 2-10 for
details.
➈
LEAK RATE display Bar graph shows leak rate of the object under test in atm cc/sec.
The mantissa (x10) is on the vertical bar graph; the exponent is
shown in the LCD window.
➀
TEST button Lights when leak detector moves into
TEST after START or when pressed
from HOLD.
➁
START button This initiates test port roughing, which
then automatically transfers into TEST.
Lights while the test port is being
roughed down and when pressed from
HOLD.
➂
HOLD button Lights when power is first applied and
when pressed.
In HOLD, the rough valve is off and
the test port is isolated.
The leak detector moves into HOLD if
spectrometer tube pressure is exces-
sive or if there is an ion source fila-
ment failure.
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