Video
When detecting leaks, it is important to distinguish between virtual and real ones. Examples of virtual leaks can be: gas desorption, diffusion, trapped volume, and back streaming. Leak-up or rate-of-rise tests can indicate whether a vacuum system's base pressure is limited by virtual or real leaks.
Agilent 2 Minute Tutorial - Identifying Virtual Leaks in UHV Systems
Agilent 2 Minute Tutorial - Measuring Ultrahigh Vacuum Pressure
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Agilent 2 Minute Tutorial - Using Ion Pump Current to Measure UHV Pressure
Agilent 2 Minute Tutorial - Material Preparation and Cleaning for Ultrahigh Vacuum
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