Chapter Four: Operation in Normal Mode
How To Start Hot Cathode High Power Degassing
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How To Start Hot Cathode High Power Degassing
During a high power degas, the filament inside the hot cathode is turned off, and all power is
delivered to the grid inside the tube. Pressure readings are not obtained during a high power
degas.
Caution
Only perform a high power degas procedure on a high power hot
cathode gauge. Performing a high power degas procedure on a low
power gauge may damage the grid within the gauge.
Note
1. The 146 unit can only perform the degassing procedure on one hot
cathode gauge at a time. All other channels will continue to function
during the degassing procedure.
2. A hot cathode must be on (channel on) in order to degas it.
The front panel display for the degassing hot cathode displays dG (the degas code)
continuously for a high power degas. A hot cathode must be on (channel on) in order to degas it.
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Normal Mode.
The system responds by scrolling through modes.
2. Press the [
DEGAS
/
SET POINT
] key, followed by [1], [2], [3], or [4].
The system responds by turning on the high power degas of the hot cathode on the
selected channel, and causing that channel’s display to change to dG .
Caution
Damage to a hot cathode gauge can occur if pressure is allowed to get
too high. Monitor the pressure, and control it within the
specifications stated for the hot cathode gauge.
Degas is only effective if the pressure remains less than 1 x 10
-5
Torr.
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