Testing a cable with a cable tester is a straightforward process to verify its continuity and proper wiring. Here's how you do it:
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Power On the Tester: Ensure your cable tester has fresh batteries or is properly plugged in and turned on.
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Connect the Cables: Plug one end of the cable into the corresponding jack on one side of the cable tester, and the other end of the cable into the corresponding jack on the other side of the tester. Most cable testers have jacks for different cable types (e.g., RJ45 for Ethernet, RJ11 for telephone).
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Initiate the Test: Select the appropriate test setting on the cable tester. This often involves turning a knob or pressing a button. The specific settings will depend on the type of cable you are testing (e.g., Ethernet, coaxial).
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Observe the Results: The cable tester will then run a series of tests to check the continuity and wiring of each conductor in the cable. LEDs or a digital display will indicate the results.
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Interpret the Readings: Here's a general breakdown of what the readings might indicate:
- All LEDs light up in sequence: This typically indicates that all wires are correctly connected and there are no shorts or opens.
- Missing LED(s): A missing LED indicates an open circuit or a broken wire.
- LEDs light up out of sequence: This suggests a crossed wire or miswiring.
- Multiple LEDs light up simultaneously: This may indicate a short circuit.
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Consult the Tester's Manual: Different cable testers may have slightly different display methods and error codes. Always refer to the tester's user manual for specific instructions and troubleshooting information.
Example: Testing an Ethernet Cable (Cat5e, Cat6)
- Connect both ends of the Ethernet cable into the RJ45 jacks on the cable tester.
- Set the tester to the "Ethernet" or "RJ45" test mode.
- Observe the LEDs. A properly wired Ethernet cable should show LEDs 1 through 8 lighting up in sequence on both sides of the tester.
Common Cable Tester Types:
- Basic Continuity Testers: These simple testers primarily check for continuity – whether a signal can pass through each wire.
- Advanced Cable Testers: More advanced testers can identify shorts, opens, miswires, and even measure cable length and signal loss. Some can even certify cables to industry standards.
Troubleshooting Tips:
- If you get a "fail" reading, first double-check that the cable is securely plugged into both the tester and the device you're connecting.
- Try testing a known-good cable to ensure the tester is working correctly.
- If the cable is faulty, try re-terminating the connectors or replace the cable.
