990 CLD Autoline™ Leak Detector
DR
AFT 2/2/04
3-3
6. When the spectrometer tube pressure meter indicates two-thirds of the way down in
the green band (from right to left), move the FILAMENT switch on the secondary control
panel to the ON/AUTO position.
When the FILAMENT switch is in the ON/AUTO position, and the needle of the
spectrometer tube pressure gauge reaches two-thirds of the way down the green band,
the filament lights automatically.
If the FILAMENT lamp fails to light, change the position of the FILAMENT 1, FILAMENT
2 switch.
❑
If changing the FILAMENT 1, FILAMENT 2 switch position has no effect, turn off the
MAIN POWER switch and check the connections to the ION SOURCE connector on
the rear panel of the controller.
❑
If changing to FILAMENT 2 results in the FILAMENT lamp lighting, then it is possible
that Filament number 1 is burned out. Replace the ion source during the next
scheduled maintenance period.
7. Ensure that the LEAK RATE display reads upscale.
It the display does not read upscale:
❑
Use the RANGE pushbuttons to select an appropriate scale.
or
❑
Use the ZERO potentiometers on the front panel and on the secondary control panel
might require adjustment to obtain a reading.
If an upscale LEAK RATE reading cannot be obtained:
a. Turn off the MAIN POWER switch.
b. Check the connections to the PRE-AMP connector on the rear panel.
8. Check the tuning and calibration of the leak detector as described in “Tuning
Adjustments and Calibration Check” on page 3-4.
9. Check the functioning of equipment wired to the General l/O and SET POINT
connectors.
If it is desired to use the SET POINT function of the leak detector, refer to “As-Required
Procedures” on page 3-8.
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