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Making Distance-Domain Measurements
Distance domain measurements—commonly known as distance-to-
fault (DTF)—are made over a selectable distance range. They return in-
formation that can help locate discontinuities in a transmission line.
Selecting a Frequency Range
NOTE:
The maximum distance range is determined by the
frequency span, number of data points, and relative
propagation velocity:
Maximum Unaliased Range
V
F F
f
=
´
-
( . ) ( ) ( ) 1 5 10 129
2 1
8
Where: F1 is start frequency
F2 is stop frequency
Vf is relative propagation velocity
maximum unaliased range is in meters.
Refer to Figure 2-10, page 2-38, for a plot of maximum
distance range versus frequency span.
Step 1.
Press the FREQ soft key, from the Main Menu
(page 2-8).
Step 2.
Press the F1 soft key from the ensuing soft key menu.
Step 3. Enter the desired numerical value using the keypad or
the Up/Down Arrow key (Figure 2-1, page 2-0).
Press
ENTER when data entry is complete.
Step 4.
Press the F2 soft key.
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Chapter 2 Operation