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...2 OPERATION
...2.3 Chart View
Screen Interval
18 Seconds/Screen
90 Seconds/Screen
1 Minute/Screen
3 Minutes/Screen
7 Days/Screen
S
a
m
p
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R
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S
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B
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0
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M
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12
Use 'Screen Interval' to change the amount of data displayed on the screen. A longer
screen interval displays more data, a shorter screen interval displays data over a shorter
time period, but in more detail. In both cases, the full trace is preserved by plotting the
maxiumum and minimum samples for each display point.
Longer interval =
better overview
When 'Configuration Type' is set to 'Basic' (see Section 4.4.1), the screen intervals
available in the menu are determined by the faster of the primary and secondary sample
rates set for the process group during configuration – see Section 4.5.1. Unavailable
screen intervals are greyed-out.
When 'Configuration Type' is set to 'Advanced' (see Section 4.4.1), all screen intervals are
available.
Note. The time taken for the screen to refresh after changing the screen interval setting is
dependent on the sample rate and screen interval selection, e.g. fast sample rate + long
screen interval = slow refresh rate.
Table 2.1 shows the relationship between sample rate and screen interval for the two chart
types.
Notes.
• A 'Please Wait' message appears while the instrument retrieves data from storage.
• Selecting a different screen interval does not affect the rate at which data is sampled.
• When in historical review mode, changing the screen interval causes the time at the
cursor position to change.
V
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c i
<
s 1
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d
1
s 0
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p
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4
s 0
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p
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6
s 0
U
p
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n a
1
4
s 0
U
p
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n a
1
4
s 0
U
p
o t
Table 2.1 Sample Rates and Screen Intervals
M
a
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m
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S
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C
h
a
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9
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d
a
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d
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7
d
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Shorter interval
= more detail
c
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d
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3
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4
5 .
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a
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c s
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c s
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c s
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c s
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