990 CLD Autoline™ Leak Detector
4-12
DRAFT 2/2/04
4. Measure the repeller voltage between TP2(+) and TP4(-). Then move the RESIDUAL
BACKGROUND switch to the RUN position.
The following readings should be obtained (± 10%):
5. Measure the focus voltage between TP3(+) and TP4(-). Then rotate the FOCUS control
fully clockwise and measure the voltage again.
The following readings should be obtained (± 10%):
If all the voltages are within the designated ranges, the ion source should be working
properly. It may then be necessary to readjust the ION and FOCUS controls in order to
properly tune the spectrometer tube.
Overpressure Protection Adjustment
This adjustment is made with the cover of the leak detector and the main electronics safety
shield removed.
To adjust the overpressure protection:
1. Set the MAIN POWER switch to the OFF position.
WARNING
The high-voltage lead has a potential of 2000 V when the
MAIN POWER switch is ON. Be sure the switch is off before
making the following connection.
2. Remove the plug from the cold cathode gauge SHV connector on the rear panel and
connect a 50 MOhm, 2 W (minimum) resistor between the center pin and ground of the
SHV receptacle.
3. When the resistor is properly positioned, set the MAIN POWER switch to the ON
position.
The SPECTROMETER TUBE pressure meter should indicate two-thirds of the way down
the green band (from right to left).
TP3 -TP4
Repeller Voltage CHECK = 330 VDC
RUN = 430 VDC
Leave the switch in RUN position.
TP3 -TP4
Focus Voltage
ccw = 310 VDC
cw= 250 VDC
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