4-4 INITIAL OPERATION
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4.3.1.6 Standby
Press and release the white Enable/Standby button on the front panel of
the Auto Controller. Notice that the yellow Standby LED under the button
turns on and the green Enable LED above the button turns off. The same
LED transition from Enable to Standby also happens on the Filament
Power Supply and the Discharge Power Supply as the Auto Controller
sequences them off.
The auto controller updates the program and saves a new starting gas
fl
ow so the anode parameters will be reached more quickly the next time
the program is run.
4.3.1.7 Setpoint Adjustment
Wenn the Auto Controller is in the Auto Gas mode, the starting gas
and the discharge voltage and current can be adjusted before the auto
controller is enabled as described above.
Once the controller is enabled, the discharge voltage and current can
be adjusted. Adjusting the discharge current when the auto controller
is enabled also adjusts the emission current. In this case, the emission
becomes a
fi
xed ratio of the emission current to discharge current based
on the emission and discharge current setpoints before the Auto Controller
is enabled. For example: The discharge current and emission current are
set to 4.0 amps and 4.4 amps before enabling the auto controller; after
enabling, the discharge current is adjusted to 5.0 amps and the emission
current will automatically be adjusted to 5.5 amps.
Making any adjustment to the setpoints will cause the program number
indicator to
fl
ash indicating that the new setpoints have not been saved.
This is called the Scratchpad. The scratchpad is a temporary memory
storage for programs that have not yet been saved.
4.3.1.8 Scratchpad
The scratchpad becomes active whenever a setpoint is adjusted and is
indicated by a
fl
ashing program number LED. It is used for setting up
new programs. The scratchpad setpoints act as an additional program
until the Acquire Setpoints button is pressed. If the power switch on
the Auto Controller is switched off when the scratchpad is active and
then switched back on the scatchpad setpoints will be lost. If another
program is selected and allowed to run while the scratchpad is active, the
