Bird Technologies SA-6000EX - Manual (Page 156)

Bird Technologies
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Markers
Markers are used to show the exact value at one point on the graph. In
Measure Match and Cable Loss modes, the marker displays the fre-
quency and loss (or VSWR). In Fault Location mode, the marker dis-
plays the distance and loss.
Run / Hold
When HOLD is displayed, the unit makes a new sweep every few sec-
onds, and displays the latest sweep.
When RUN is displayed, the unit will only make a single sweep. The
display will not update if the Site Analyzer is disconnected or if the
cable is jiggled. This is usually preferred.
Equations
Fault Location
Resolution
where C = speed of light (300 x 10
6
m / sec) or (9.84252 x 10
8
feet /
sec)
Maximum Distance
Fault Location Distance Tables
The tables on the next pages will help you select the frequency span,
measurable distance, and resolution for fault location measurements.
Select the table for the number of data points you wish measure (238,
475, 949).
Resolution
C
freq span 2 ×
------------------------------- =
Max distance resolution data points 1 – ( ) Ч =