Model 990 dCLD II Component Leak Detector
4-8
Digital Leak Rate
The Digital Leak Rate displayed on the touch panel Home screen
correlates directly with the bar graph leak rate display when the
mantissa value of the leak rate is greater than one. Leak rate read-
ings with a mantissa value of less than one are shown on the touch
panel Home screen with an exponent that is one decade below the
bar graph display exponent. The units are user selectable from the
Units Set-Up screen (see Section 4.6.3 “Units Set-Up” on
page 4-15).
For example, the bar graph displays 0.8 x 10
−
09 atm cc/sec
(Figure 4-5), then the leak rate displayed on the touch panel Home
screen is 8.0E-10 (8.0 x 10
−
10) atm cc/sec (Figure 4-6). This fea-
ture provides exceptional leak rate resolution.
Figure 4-5 Bar Graph Display: 0.8 x 10
−
09 atm cc/sec
Figure 4-6 Touch Panel Digital Display: 8.0E
−
10 atm cc/sec
Reject Status Indicator A REJECT status indicator displays below the Leak Detector Condi-
tion on the left-hand center of the Home screen when any of the
four independent set points are enabled and have been activated
(see Section 4.6.2, “Reject and Audio Set Points”). If all set points
are disabled or are not active, then this indicator is not present.
Leak Detector
Operating States
This line displays the current operating state. See Table 4-1 on
page 4-9 for a listing and description of the messages that can
appear here.
Leak Detector Status
This line displays the current operating state of the 990 dCLD II.
Under normal operating conditions, this line reads SYSTEM
READY. See Table 4-2 on page 4-9 for a listing and description of
the messages that can appear here.
Leak Detector
Condition States
Under normal operating conditions, this line is blank. If a problem
occurs, it displays the condition that needs attention. See Table 4-3
on page 4-10 for a listing and description of the messages that can
appear here.
0
1 2
3 4
5
6
7
8
9 1
0
-
0
9
L
I
N
X
1
0
L
E
A
K
R
A
T
E
:
8
.
0
E
-
1
0
a
t
m
c
c
/
s
e
c
Summary of Contents for 990 dCLD II
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