D U N I W A Y S T O C K R O O M C O R P .
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D. Set Pt 1 low
Default Value: OFF
This sets the low limit of the set point. This is the pressure at which the set point relay will be
energized. Operation is similar to that of S
ET
P
T
1 H
IGH
above. The minimum value is
OFF
; this
shuts the set point off. The next increment is 0.1% of the full scale range; for example, if the full
scale range is 1 torr, the increment sequence is:
OFF
, 1.0 mTorr, 2.0 mTorr, etc.
SET
PT
1
LOW
operates in conjunction with
SET
PT
1
HIGH
.
NOTE: The High and Low set point allow the user to set the hysteresis of the
set point operation. As the system is pumped down, the set point relay will
be energized (set point turns on) as the pressure drops below
SET
PT
1
LOW
.
The relay will remain energized until the pressure rises above
SET
PT
1
HIGH
.
It is not possible to adjust the High set point to be lower than the Low set point. If you adjust the
High set point below the pressure previously selected for the Low set point, the 908A will auto-
matically reduce the value for the Low set point so that it is the next increment lower than that of
the High set point.
E. Set Pt 2 High
Default Value: OFF
This operates in the same manner as
SET
PT
1
HIGH
, described above.
F. Set Pt 2 Low
Default Value: OFF
This operates in the same manner as
SET
PT
1
LOW
, described above.
G. Units mTorr/Torr/kTorr -- Bar/mBar/microBar -- Pascal/kPascal -- Arb
Default Value: Torr
This allows selection of the units to be used in display of the pressure. Press either the
RAISE
or
LOWER
buttons to alternate between Torr, mBar and Pascal. You will notice that both the
GAGE
1
and
GAGE
2 indicators will be lit also. This is to let you know that the units of measure apply to
both gauges; it is not possible to select Torr for one gauge and mBar for the other gauge. The
“Arb” value allows arbitrary units to be used; the value displayed is the same as for Torr units,
and can be adjusted using the “Full Scale” and “Calibrate” functions.
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
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