GE PT878GC Manual do Utilizador Página 93

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April 2004
4-32 Programming Site Data
Entering Skan/Correlation Parameters
To open the Skan/Correlation window in the Skan/Measure
option, press the [X] arrow key three times (from the All tab) to
reach the Correlate tab, and press
[ENTER]. The screen appears
similar to Figure 4-14 below.
Figure 4-14: The Correlate Window in the Skan/
Measure Option
To identify the peak of the received signal, the PT878GC uses the
“Threshold” method, in which the peak is identified as the point
where the signal crosses a threshold that is a percentage of the
maximum signal detected.
1. The first prompt, Min Threshold, asks for the minimum
percentage of peak used to measure transit time.
a. Press
[ENTER] to enter the text box.
b. Use the numeric keys to enter the recommended value.
c. Press
[ENTER] to confirm the entry.
Integrate
Skan/Measure
Cancell OK
All
Min Threshold
Percent Peak
%
Count
Correlate
-100
Measure Only
100
-40
%
%
Max Threshold
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