Gamma Vacuum SPCe - Figure 11: Voltage; Figure 12: Current; Figure 13: Foldback Pressure

Figure 11. Voltage
Current
The Current parameter sets the output current. The maximum current
output is limited based on the size of the ion pump programmed into the
controller. The default is 2 mA per l/s.
Figure 12. Current
Foldback Voltage Feature
With the Foldback feature enabled, the SPCe will reduce the voltage once a
specied pressure is reached. The specied pressure can be set in the range
of 1x10
-5
to 1x10
-12
Torr. The default is 9x10
-9
Torr. The Foldback voltage
can be programmed in the range of 3000 V to 6900 V, done in 100 V
increments. The default voltage is 3500 V.
Figure 13. Foldback pressure
Pressure or Current Output Setting (Monitor)
The SPCe can be monitored via the miscellaneous I/O port (J1). This
parameter determines the pressure or current output. Selectable values are:
▪ Pressure: Logarithmic
▪ Current: Logarithmic
▪ Current: 1VDC per 1nA
▪ Current: 1VDC per 10nA
▪ Current: 1VDC per 100nA
▪ Current: 1VDC per 1uA
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