Advanced Videographic Recorder
SM2000
2 OPERATION
12
IM/SM2000
Issue 11
Use the '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
maximum and minimum samples for each display point.
When 'Configuration Type' is set to 'Basic' (see Section 4.4.1, page 52), 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,
page 64. Unavailable screen intervals are greyed-out.
When 'Configuration Type' is set to 'Advanced' (see Section 4.4.1, page 52), 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 Vertical
and Horizontal Chart views.
Note.
A 'Please Wait' message appears in the status bar 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.
Maximum Screen Interval
Sample Rate Setting
Vertical Chart View
horizontal Chart View
<1 second
Up to 9 minutes/screen
Up to 13 minutes/screen
Between 1 and 10 seconds
Up to 1 hour/screen
Up to 1.5 hours/screen
More than 10 seconds, less than 20 seconds
Up to 12 hours/screen
Up to 18 hours/screen
Between 20 and 40 seconds
Up to 1 day/screen
Up to 1.5 days/screen
Between 40 and 60 seconds
Up to 2 days/screen
Up to 3 days/screen
More than 60 seconds, less than 140 seconds
Up to 3 days/screen
Up to 4.5 days/screen
More than 140 seconds
Up to 7 days/screen
Up to 10 days/screen
Table 2.1 Sample Rates and Screen Intervals
Shorter interval
= more detail
Longer interval =
better overview
