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Page 18
Set the Ion Gauge overpressure trips (OVP) to suit the filament
material and your customary practice. The OVP will
automatically restrict the maximum trip pressure of any relay
assigned to that gauge to half the OVP.
A maximum OVP of 1E-3 mB/Torr is recommended for an
AIG17G with Tungsten filaments or 1E-2 mB/Torr with coated
filaments.
Define whether you require the instrument to change emission
current automatically. If set to ‘No’ the instrument will suggest
when a manual change in emission current is appropriate.
Refer to section 8.2 for Ion Gauge emission details.
Define whether you wish to add ion current to the Gauges
Display Sequence. Ion current in Amps will be displayed
following numeric Ion Gauge pressure.
Pirani Gauges can be switched on or off. Switching off
suspends the operation of Interlock and Autostart functions
when Pirani 1 is selected as the Interlock or Autostart gauge.
Define whether you have an Active Gauge connected. Selecting
‘N
o
’
suspends the operation of Interlock and Autostart
functions when Active Gauge is selected as the Interlock or
Autostart gauge.
Then, choose the analogue input format of the Active Gauge.
The options are:
•
Linear
, in which 0 to 10 V is mapped to a range of 0
to a selectable full-scale pressure value.
Specify the full-scale units, either mB or Torr, and the
full-scale value, either 1, 10, 100 or 1000.
•
Log
, in which 0 to 10 V is mapped to pressure
according to:
𝑃 = 10
𝑈−6.5
Where
𝑃
is the pressure in mB, and
𝑈
is the voltage.
Use this mode for the AML APG-1 Pirani Gauge.
Summary of Contents for NGC3
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