Agilent Technologies Helium User Manual page 76

Technical Information
The firmware initially starts at a large time interval, but recalculates the required
NOTE
time as the pumping continues. The new time is reflected on the timer.
The new Applications Setup Menu (Test Confutations Menu) helps guides you
through the process - Select High Sensitivity.
Figure 32 Helium Background Timer
76 Agilent Helium Leak Detector User Manual