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III
Operation
A. Turn Power On
Plug the AC power end of the power cord into an electrical outlet. The loudspeaker will “beep”
and test all indicators while the controller executes its self test. After being turned on, the instru-
ment will go through the following sequence:
• “beeper”
• indicators for
TORR
,
M
B
AR
• 10 LED indicators for set points and other functions
• all four digits will light, including decimal points
• display shows the model number of the instrument,
921
• display shows software version, e.g.
1.01
Following the initial self-test, the display will show
OFF
. This indicates the high voltage for the
anode has not been applied.
B. Front Panel Controls
The Model 921 allows flexible configuration of operation using simple entry from the front panel
buttons labeled
GAUGE
ON
/
OFF
,
SELECT
,
RAISE
and
LOWER
. Parameters which you may adjust are
selected by scrolling through the list which begins with
SET
PT
1
HIGH
. Each time the
SELECT
but-
ton is pushed, the led indicator advances to the next parameter. The
LED
indicators will be lit to
indicate which parameter is being adjusted, and the digital display will flash to indicate the value
of the parameter being adjusted.
Each push of a button will give a short “beep” from the loudspeaker to confirm the button was
pushed. If you have reached the limit of adjustment or if the button push is not allowed, the loud-
speaker will give a long “beep”.
Following is detail description of the parameter selection and adjustment:
1.
Set Pt 1 High
This sets the high limit of the set point. Above this pressure, the set point relay will be de-ener-
gized. Press the
RAISE
and
LOWER
buttons to enter the value desired. The minimum value is
OFF
;
this shuts the set point off. The next increment is to 1.1 x 10
-9
Torr.
When the
RAISE
or
LOWER
buttons are pressed, the display will change slowly at first. If you hold
the button down for a few seconds, the rate of change will increase to allow you to make large
changes more quickly.
SET
PT
1
HIGH
operates in conjunction with
SET
PT
1
LOW
. While the 921 is in this mode, the set
point may be assigned to either
GAGE
1 or
GAGE
2 by pressing the
GAUGE
SELECT
button.
2.
Set Pt 1 low
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
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