
OPERATION
MULTI GAUGE CONTROLLER
•
Degassing voltage
- May be set between
and
V. The MG is used during degassing
the electron bombardment method. It is recommended to carry out degassing at the highest
voltage admissible by the gauge. At a higher voltage a lower emission current is required to
obtain the same degassing power, which affects positively the life of the ilament.
. . .
ACTIVE GAUGE SETTING
To obtain correct indications choose a gauge compatible with the physically connected one. For
that purpose click on
Setup menu →Sensor →IG or CH or CH
and select the required gauge.
The user can select one of the standard gauges or a gauge named as
De ined
, which enables any
gauge of a logarithmic character with - V output to be connected (details in . . . ).
A linear gauge de ined by the user can also be added. For that purpose
Baratron
gauges have the
FS De ined
item. This item enables any
Full scale
parameter in Torrs to be introduced.
The MG enables also automatic detection of a connected gauge if it has an in-built identi ication
resistor. To activate automatic detection of active gauges enter the
Setup menu →Sensor →Auto
identi ication
and activate this option for the chosen vacuum channel. If the connected gauge has
been successfully identi ied its name will be displayed in the Sensor menu and on the main window
by the relevant vacuum channel.
GAUGE
IDENTIFYING RESISTANCE
CTR /
, k
Ω
TTR / /
k
Ω
PTR
k
Ω
PKR
, k
Ω
PCT
, k
Ω
PTR
k
Ω
ITR
k
Ω
Table . : Identifying resistances for supported gauges
For
CTR /
gauges, if they are successfully auto-identi ied, specify also the Full scale factor. It
can be done analogically to the manual selection of a gauge type.
Note
If the active gauge cannot be manually set (empty selection list), it means that
the Auto-identi ication option is active.
. . .
USER-DEFINED ACTIVE GAUGE
The option enables the user to de ine his own gauge. The condition is that it is a logarithmic active
gauge ( - V).
To de ine a gauge for the selected channel enter
Setup menu →Sensor →IG or CH or CH →De-
ined
and set accordingly the equation factors characterising the gauge:
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�[ �� ] =
⋅
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