USER MANUAL Short circuit locator for metallic cables
Contents
1. EXAMPLE Faulted cable is 25000 meters long The value read in position E LE is 24 7 the value LB is 24 7 the cable has only one contact at distance 24 x 25000 6175 100 meters from the Outside end of the cable SPECIFICATIONS Can test cables with a loop resistance gt 5mQ 90 m 300 mm and lt 30 KQ Range gt 100 km 300 O km Basic accuracy 0 1 1 digit Maximum measuring current 1A Maximum applied voltage 70 mV Power supply 7 2 9V 6 x AA size Alkaline or NiCd NiMh batteries Battery life 7000 measur 100 mQ Weight 520 g Dimensions 110 x 204 x 41 mm TROUBLESHOOTING No display Dead battery dim display Instrument failure Unstable Dead battery measurement Cable to test not faulted Measurement carried out immediately after a voltage test Cable to test too short Cable to test not connected Broken test leads Instrument failure CALIBRATION Our instruments are calibrated using the following standards Datron 4705 Autocal Multifunction Calibrator Yokogawa 7563 Precision Digital Thermometer GenRad 1686 Digital Capacitance Meter Agilent 66309D Mobile Communic Source HP 34401 Multimeter HP 34970A Data Acquisition Unit Burster 1424 IEEE488 High Precision Decade Tettex 3200 BU Standard Resistor AOIP 0 01 Q Standard Resistor Tettex Decade Capacitors ARCO Standard Capacitors JBC 5001 Standard Capacitor Lecroy LT264ML Oscilloscop2. e Haefely PU12 Impulse tester Schaffner NSG431 Electr Discharge Simulator Lecroy 9109 Arbitrary Function Generator Norbar 40051 Torque meter HP 3577A Network Analyzer SERVICING INFORMATION lf you have questions or need further assistance please email us at support agmel com Our complete catalog can be viewed printed or book marked from our website www agmel com AGM Elettronica Via Marziale 9 80067 Sorrento NA ltaly Tel 39 3334288922 Fax 39 081 8071249 www agmel com E mail info agmel com USER MANUAL Short circuit locator for metallic cables Mod A9 l 0 AGMel ce Y 2002 95 EC IA910 Rev 2 04 13 3 rn 4 2 1 probes connector 4 battery holder 2 display 5 measure mode select 3 measure switch Lead connections DESCRIPTION The A910 is a short circuit locator for electric telephone and power cables wind on the reel it gives the position of the fault from the inside or outside end of the cable in percentage to the total cable length HOW TO USE IT Ground the cable to be tested from any electrical charges If wire A is short with B connect the crocodile clips to the cable 1 the crocodile clip I to A from the inside end 2 the crocodile clip E to A from the outside end 3 the crocodile clip COM to B from the outside end Perform a calibration test turn the measure mode knob to Ref and pus
3. ed The calibration test is possible only after a cable is connected The crocodile clips and E are special Kelvin clips do not force the opening
4. h the measure switch the display will show 100 0 0 1 otherwise a the cable has a total resistance below 5 mQ b the cable has some electrostatic charges within c the test leads are broken Turn the measure mode knob to E and push the measure switch read on the display the value LE length of the cable in percentage to the total cable length from clip E to the short Switch the crocodile clip COM to wire B from the inside end push the measure switch read on the display the value LB if LE LB 0 1 than the cable has just one short at distance Value LE x total length of cable 100 from the outside end of the cable f LE LB 0 1 the cable has more than one short and the distance to fault is calculated making use of the program supplied with the instrument To measure the distance to fault from the inside end of the cable turn the measure mode knob in position I and push the measure switch To remove the battery door push the two gray plastic tabs Be careful to observe battery polarity during installation WARNINGS AND SAFETY RULES The locator is protected against electrical charges but in some conditions these charges on the wire can accumulate and can be dangerous for the technician therefore always ground the cable before any measurement Do not short the clips I with E for a long time otherwise the battery life will be reduc
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