Chapter 7 Retrieving Information
248
Figure 115 The Monitor Time vs. Background Time Sum Zone Screen
Note: CTRL+HOME brings up Dete
ctor 1; CTRL + END brings up “All” (background) sum zone.
The screen above is used to aid setting the Background Average Period. To determine
the settings examine all zones to find maximum Background Average Period, such
that it is greater than the largest black circle (3 s more than T
m
when T
b
= ∞) shown
in the figure above.
• Red vertical line is minimum allowed value for Background Average
Period in seconds.
• Green vertical line is current for Background Average Period in seconds.
• Red horizontal lines are Count Time Minimum and Maximum settings
• Smallest black circle is Monitoring time (T
m
) that is 1 s more than T
m
when
Background Time (T
b
) = ∞
• Middle size black circle is T
m
that's 2 s more than T
m
when T
b
= ∞
• Largest size black circle is T
m
that's 3 s more than T
m
when T
b
= ∞