Practice Use Of The Tester 301 B - BT 301B Handbook

7.
PRACTICE USE OF THE TESTER 3018
7.1
Obtain a reel of jumper wire (length marked) with access to both ends, connect the T ester
to one end and leave the other end open circuit.
7.2
Turn the supply switch to ON, adjust the tester to measure the length of the jumper wire (using the
method given in section
approximately the same as marked on the reel. (The marked and measured 'electrical' lengths will
not be the same because the jumper wire is coiled.)
7. 3
Next watch the display and short the ends of the jumper wire together. The fault pulse will invert
(see Fig.
14).
7. 4
T he distance to fault measurement should be the same for both measurements.
7.5
The above exercise may be repeated using more than one reel of jumper wire connected together
in series to simulate faults at various distances.
and note this length. The measured electrical length should be
5)
301 B
16