Models 947, 948 and 960 Leak Detectors Operations and Service Manual
3-14
3.5 Operating Procedures
The testing parameters vary from one manufacturing environment to another. Appendix G,
“Leak Detection Theory” describes the conditions under which the 947/948/960 Leak
Detectors can be utilized. There are many applications. A Varian Vacuum Technologies
representative is always available for technical assistance.
Whatever the leak detection situation, testing is accomplished in one of the two operating
procedures:
❑
“Auto Ranging” below
❑
Requirements:
❑
After shutdown of a leak detector, a complete startup is necessary as outlined in
Start-up Procedure.
❑
Verify the integrity of the leak detector with the Calibration and Sensitivity Checks
Procedure on a daily basis or as necessary.
3.5.1 Auto Ranging
To use auto ranging for outside-in testing:
1. Press the
VENT
button. Securely attach the new unit under test to the test port while the
947/948/960 is in VENT mode.
❑
The TEST LED goes off.
❑
The VENT LED illuminates.
2. Select the
AUTO
(Figure 3-4) position of the AUTO/MAN MODE switch in the Leak
Rate Range section.
Figure 3-4
Location of AUTO/MAN MODE Switch
