How To Stop Hot Cathode Degassing
Chapter Five: Operation in Leakage Mode
150
How To Stop Hot Cathode Degassing
When a low power degas is turned off, power to the grid inside the tube is discontinued. The
filament remains on and the front panel display shows the pressure reading.
When a high power degas is turned off, power to the grid inside the tube is discontinued (as with
a low power degas). The channel re-initializes and the hot cathode filament turns on. The front
panel display shows a pressure reading during initialization but this reading should not be
considered valid until the display stops flashing (within 1 to 2 seconds).
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Leakage Mode.
The system responds by scrolling through modes.
2. Press the [
DEGAS
/
SET POINT
] key, then the [
OFF
/
GAIN
] key, followed by [1], [2], [3], or
[4].
The system responds by turning off the degas of the hot cathode on the selected channel.
A. If the hot cathode had been undergoing a low power degas, its display shows a
continuous, valid, pressure reading.
B. If the hot cathode had been undergoing a high power degas, the gauge re-
initializes and its display flashes until initialization is complete (within 2
seconds). The display then shows a continuous, valid, pressure reading.
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