Selecting Full Scale Sensitivity; Adjusting The Vp Value; Determining And Measuring Vp Values - AEMC CA7027 User Manual

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User manual (20 pages)

Table Of Contents

Table of Contents

NOTE: The auto-off function is disabled in Tone Generator mode, so that

the tone can be injected into a cable for an extended period of time while

tracing takes place.

See §4.10 for attaching a cable to the Fault Mapper Pro

4.7

The Fault Mapper Pro

19,000 ft (0.5 to 6000m).

To select a range scale, or scan the cable run, press and hold down the

TDR /

button to increase the range.

4.8

To adjust the Vp, press and hold the

button to enter the setup mode. Release both buttons. Press the

button until the pointer (>) is next to Vp.

Next use the and buttons to adjust the Vp to scroll between v/2, M/Ms

or Vp % UC.

Press the

4.9

Vp, or Velocity of Propagation, values are characteristic of each cable

type and brand. The Vp is used to measure the length of a cable and to

measure a fault location. The more accurate the Vp, the more accurate the

measurement result will be.

The cable manufacturer may list the Vp on their specification sheet or may

be able to provide it when asked. Sometimes this value is not readily avail-

able, or the user may wish to determine it specifically to compensate for

cable batch variations or for special cable applications.

1. Take a cable sample of exact length increments (ft or m) longer than

300 ft (100m).

2. Measure the exact length of the cable using a tape measure.

Fault Mapper Pro

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