General Information Cha
ter Five: O
eration in Leaka
e Mode
126
Code 7: How To Set the Display for
Leakage Mode
,
page 222, to learn how to define the time
base.
Instantaneous leakage is the difference between the current pressure reading, and the base
pressure. The base pressure is the pressure reading on a channel when Leakage Mode was first
entered. For example, if the pressure reading on channel 4 was 900 Torr when Leakage mode
was first entered (the base pressure), and the current pressure reading is 905 Torr, the
instantaneous leakage value is 5 Torr. The base pressure is taken for all channels (not just the
one in the main display) when Leakage Mode is entered. As a result, leakage can be viewed for
any channel by bringing that channel into the main display.
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