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Chapter 2
Setup
25
Figure 2-7
EXIT
Press Exit to return to the Select Cable main screen.
Cable Test
Cable Test determines the VOP of a cable if the length of the
cable is known. This simple method only requires knowing the
length of cable. The length of the cable is entered into the
CE4000 and the unit calculates the appropriate VOP for that
length of cable under test.
Since the VOP is directly proportional to the distance
measurement, a 1% error in the VOP will project a 1% error in
the distance measurements. Determining an accurate VOP is
critical to the accuracy of the distance measurements. When
possible, choose a test cable of at least 100 feet (30m) to reduce
calculation errors. Longer cables increase the accuracy, but may
be difficult to measure accurately. Also avoid cable on reels,
since the coiling slightly affects the VOP. Lengths marked on
spools are often inaccurate.
To determine the VOP of a cable using the CE4000, select the
Setup icon from the Main Menu or press the Setup key. Next,
select the Cable Test icon and press enter. The screen shown in
Figure 2-8 is displayed.