Chapter Seven: Operation in Setup Mode
Code 12x: How To Adjust the Auto Power Control
231
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Setup Mode.
The system responds by scrolling through modes.
2. Use the arrow keys to scroll to the
CODE
legend.
The system responds by causing the left display to blink.
3. Enter the number 12x (where x represents the channel number for the ion gauge), and
press the [
ENTER
] key.
The system responds by displaying the appropriate parameters for code 12x, and causing
the main display to blink.
4. Enter the switchpoint pressure (the default is 0.001 Torr).
A. If the display is correct, press the [
ENTER
] key.
B. If the display is not correct, enter the correct switchpoint (0 through 35,000 Torr),
and press the [
ENTER
] key.
The system responds by accepting the switchpoint value, and causing the right display to
blink.
5. Select on or off in the right display (the default is off).
When this function is enabled (on), a channel can still be turned off manually. If turned
off manually, a channel must be manually turned back on again before it can be
autopowered.
A. If the display is correct, press the [
ENTER
] key.
B. If the display is not correct, use the [
ON
/
LEAD
] or [
OFF
/
GAIN
] key to enable or
disable the Automatic Power On/Off feature. Press the [
ENTER
] key to select the
action.
The system responds by enabling or disabling the Automatic Power On/Off feature for
the selected ion gauge channel, and causing the center display to blink.
6. Enter the reference channel number (the default is channel 1).
A. If the display is correct, press the [
ENTER
] key.
B. If the display is not correct, enter the correct reference channel number (1 through 4),
then press the [
ENTER
] key.
The system responds by accepting the reference channel number.
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