AEMC instruments 2127.84 Manuale d'uso - Pagina 13
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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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Selecting Full Scale Sensitivity
has 11 range scales covering the range of 1.5 to
®
button, then press the
Adjusting the Vp Value
button to exit the set up mode.
TDR /
Determining and Measuring Vp Values
Model CA7027
®
GlobalTestSupply
www.
button to decrease the range or the
button and press the
TDR /
.com
®
TEST /
TEST /
11