Chapter 8 Measure Mode – Basic Tab
FDR
182 DSAM Help User Guide Rev. 001
A reflection is displayed on the graph as a peak in amplitude located
at the distance where the impedance has changed. The amplitude of
the reflection indicates the severity of the impedance change. For
example, a large reflection results if the cable is broken or un-termi-
nated.
Measurement
Information Area
This area displays the following information:
VOP – (Velocity of Propagation) is the speed at which signals travel
the length of a cable. VOP is determined by the dielectric material
used to separate the two conductors and is usually specified by the
manufacturer.
Max Precision – The maximum precision is the cable attenuation.
Resolution of
Measurement
The resolution of measurement determines the number of data points,
maximum distance of, and distance resolution/accuracy of the
measurement. This setting affects the time per measurement cycle,
with LOW being fast (least accurate) and ULTRA being slow (most
accurate). Valid options are:
– LOW (64pts) = 1 bar
– MEDIUM (128pts) = 2 bars
– HIGH (256pts) = 3 bars
– ULTRA (512pts) = 4 bars
Figure 166 Measure Mode – FDR Locate
Measurement
Information Area
Graph
Vertical
Distance Marker
Progress Bar
Status
Sensitivity
NOTE
For information about how to read the graph, see “Reading Mea-
surement Graphs” on page 196.
21128026 R001 DSAM Help User Guide.book Page 182 Thursday, February 5, 2009 2:02 PM
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