990 CLD Autoline™ Leak Detector
3-8
DRAFT 2/2/04
To peak and calibrate the leak detector for a strong helium signal:
NOTE
Only use this procedure if the standard procedure above fails.
1. Follow the normal peaking procedure.
2. Set the CALIBRATE potentiometer at minimum (fully counterclockwise).
3. Adjust the EMIS potentiometer (with the alignment tool provided with the leak detector)
to bring the unit into calibration.
4. Check the emission current with a voltmeter between TP12 and TP13 on the leak
detector main electronics PCB. The voltage reading should be between 0.2 V and 1.5 V.
If calibration cannot be achieved with emission current in this range, then the scaling of
the leak detector must be changed by the:
a. Position of the SENSITIVITY switch located behind the door of the leak detector.
b. Setting of the red RANGE SELECT switch which is accessible through the top
cover of the leak detector.
The calibration procedure (but not necessarily the peaking procedure) must be
performed after changing either of these parameters.
This completes detector calibration.
As-Required Procedures
These include:
❑
“Set Point Operation” on page 3-9
❑
“Leak Rate Display RANGE SELECT Pushbutton Operation” on page 3-9
❑
“RANGE SELECT Switch” on page 3-10
❑
“Auto Filament Toggle Switch” on page 3-10
❑
“Remote Filament Control” on page 3-10
❑
“Remote Exponent Control Operation” on page 3-11
❑
“Gain-Selective Amplifier” on page 3-14
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