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The figure shows an overall schematic diagram of my twin coaxial cable tester for finding open conductors and shorts as well as determining whether the polarity at the end of the cable is correct.
English (United States)
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Twin Coaxial Cable Tester
The figure shows an overall schematic diagram of my twin coaxial cable
tester for finding open conductors and shorts as well as determining whether the
polarity at the end of the cable is correct.
A six-position rotary switch SW1 is provided for selecting the test to be
performed when a twin coaxial cable 20 is connected to connector J1. At
position P1, all power is off.
Position P2 is for checking A to B conductors for shorts. Three volts are
applied to light-emitting diode (LED) D1, and since the diode is forward biased,
LED D1 should light up. If there is a short between conductors A and B, LED D1
will not be illumined. Resistor R6 provides limiting drain current protecting battery
B1 during a short.
Position P3 is for checking for a short between conductor A and the shield 22
of the twin coaxial cable. Three volts are applied to shield 22 through connector
J1. Current flows through shield 22. If a short exists, current will return via
conductor A through LED D2 back to the negative terminal of the B1 battery.
Since LED D2 is forward biased, it is lighted.
At Position P4, the same condition exists, but the check is for a short
between conductor B and shield 22. Current returns via conductor B, through
LED D3 back to battery B1. R1, R2 and R3 are current-limiting resistors.
At Position P5, conductor A is checked to ascertain good continuity at both
ends of the cable under test. Diode D4 is forward biased at three volts. Current