Code 16x: How To Set the HC Shutoff Features
Chapter Seven: Operation in Setup Mode
240
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 16x (where x represents the hot cathode channel number), and
press the [
ENTER
] key.
The system responds by displaying the appropriate parameters for code 16x, and causing
the main display to blink.
4. Enter the hot cathode high pressure shutoff value.
The default value is 1 x 10
-3
Torr and the range is 1.001 x 10
-5
Torr to 1 Torr.
A. If the display is correct, press the [
ENTER
] key.
B. If the display is not correct, enter the correct high pressure shutoff value, then press
the [
ENTER
] key.
The system responds by accepting the high pressure shutoff value.
5. Set the internal fast rate-of-rise shutoff feature. The factory configuration has this feature
disabled. To enable the feature, press the [
ON
/
LEAD
] key.
Note
Only enable the internal fast rate-of-rise shutoff feature if your pressure
signal is stable. A noisy pressure signal may exceed the rate-of rise-value
momentarily causing the 146 unit to turn off the hot cathode gauge
Caution
Enabling the internal fast rate-of-rise shutoff feature will make the
146 unit more sensitive to electrostatic discharge (ESD). Transient
signals may be interpreted as a fast pressure change that would cause
the 146 unit to turn off power to the hot cathode gauge. When this
feature is enabled, the 146 unit DOES NOT COMPLY with the
Low-Voltage Directive (EN61010-1: 1993) requirement for CE
certification.
The 146 unit is configured at the factory with this feature disabled.
A. If the display is correct, press the [
ENTER
] key.
B. If the display is not correct, press the [
ON
/
LEAD
] key to enable or the [
OFF
/
GAIN
]
key to disable the feature.
The system responds by enabling or disabling the internal fast rate-of-rise shutoff feature.
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