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1.
INTRODUCTION
1.1
The T ester 301 B uses Time Domain Reflectometry (pulse echo principle) to locate disconnection
(DIS) and short circuit (S/C) faults in a local cable network. Electrical pulses are transmitted along
the pair by the Tester 301 B and relfected back to the sending end by a fault on the pair. The
reflected pulse is detected by the Tester 301 Band displayed on a cathode ray tube (C.R.T.) screen.
T he time taken for the pulse to travel to the fault point and return again is a measure of the distance
to the fault. The distance (in kilometres) is read from a liquid crystal display after a narrow cursor
line on the screen has been moved to coincide with the break point of the fault pulse.
1.2
The T ester is housed in a plastic moulded box and supplied in a shower-proof carrying bag. It is
intended to be used for the location of DIS and S/C faults in local network cables up to a maximum
distance of 2.5 km in two overlapping ranges. It is not suitable for locating low insulation and
battery or earth contact faults for which other equipment should be used.
1.3
The Tester is powered from internal rechargeable cells which maybe charged from either a vehicle
charging point (Rectifier 162A), or a mains charger unit (Rectifier 161 A).
1.4
External supply facility is provided for use by the Training Schools only. For further details
contact:-
Telephone: 0727 819025
2
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