User Interface Basics - Instrutech The Hornet IGM402 User Manual

Instruction Manual IGM402 Hornet
accidental system vents or if considerable quantities of water vapor are outgassed during pump-down and bake-
out. It is very important to make sure the tungsten filament is turned off before bringing the chamber up to
atmosphere, especially if air is being used to vent the chamber. The use of pure N gas is highly recommended
2
to vent or purge your vacuum chamber. Testing has shown that tungsten filaments can withstand limited high
pressure excursions when only N is present.
2
Venting with air or other oxygen containing gases can damage the tungsten filaments. If you try to turn on an
ion gauge with tungsten filaments while it is sitting on your desk exposed to room air, you will immediately
damage or destroy the filament beyond repair.
NOTICE
Do not use another gauge to automatically turn off the ion gauge when the Ion gauge filament
in use is constructed of tungsten (yttria coated filament is ok). The response time of other gauges may not
allow for timely turn off of the tungsten filament leading to filament damage. Always turn off the IG filament
-3
manually before pressure is to rise above 1.00 x 10 Torr.
Note - Both types of filaments will suffer eventual damage if operated at high pressures. The type and amount
of damage at high pressure is dependent upon the length of operating time, the pressure and the gas present.

User Interface Basics

5.6
The user interface is designed for easy operation and a natural progression of setup parameters and control
functions. This section gives a brief explanation of device operation for added clarity.
There are four soft-keys located on the front panel,
below the display. These keys are used to select and
program the various parameters and control functions
available. During programming of the IGM402, the
display will identify what each function key represents.
To begin programming, press the MENU key. Press
either the UP or DOWN key to choose (highlight) the
desired menu. Press the ENTER key to access the
menu choice, change parameters and save the new
settings.
Press the MENU key to return to the previous menu
or, if necessary, press repeatedly to return to the main
pressure measurement display screen. To continue
Programming soft-keys
setting additional parameters, scroll with the UP and
DOWN keys until you reach the desired parameter.
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