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8.
ACCURACY AND INTERPRETATION
The accuracy obtainable with the T ester
( a )
The accuracy of the instrument itself.
( b )
The condition and characteristics of the pair under test.
Water in a cable may alter its transmission characteristics and thus give an incorrect reading. Also
the measured length and actual overground cable length may differ due to the lay of the cable
pairs. However, the accuracy of the T ester
( a )
The fault will usually be in the joint nearest to the location given by the T ester
may occur where it is necessary to repeat the location procedure from the joint where the fault
appeared to be in order to achieve a second and more reliable location.
( b )
The accuracy of location is not greatly affected by con ductor s i z e . However, it has been found
that readings are likely to be approximately
approximately
8%
301
B is dependent on:-
301
long on polyethylene aerial cables.
Bis generally adequate for fault location since :-
10%
short when testing on paper core cables and
301
B. Cases
18
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