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How To Test 75 Ohm Coaxial Cable

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Testing a 75 ohm coaxial cable is essential to ensure that it delivers the best possible signal quality. This testing process can be done using several different types of equipment, which will accurately check a range of key parameters. In this guide, we’re going to explore how to test a 75ohm coaxial cable.

Tools Required:

To test a 75 ohm coaxial cable, there are several tools and pieces of equipment required, including:

• Digital MultiMeter

• Cable Tester

• A calibrated reference cable/coupler for the connectors to avoid inaccurate measurement due to the impedance mismatch.

• A signal generator-should cover the frequency range of the cable

• A power meter or oscilloscope to measure the downstream signal quality

Steps to Follow:

Step 1: Begin by identifying the connector type at both ends of the 75 ohm coaxial cable you plan to test. For example, the most common connector types associated with a 75ohm coaxial cable are BNC and F-type connectors.

Step 2: Proceed by cleaning the connectors using alcohol and cotton wipes. This is done to ensure that the connectors are free of dirt, dust, or any other contaminant that could potentially affect the signal quality.

Step 3: Connect the calibrated reference cable or coupler at both ends of the 75ohm coaxial cable. This is done to avoid inaccurate measurement due to impedance mismatch.

Step 4: The next step is to test the continuity of the cable using a digital multimeter. The digital multimeter should be set to the continuity mode, and the two probes from the meter should be connected to the respective ends of the cable. If the digital multimeter registers a solid connection, this indicates that the cable is continuous.

Step 5: Use a cable tester to detect any shorts, resistance imbalance, or open circuits. The tester should be connected to the cable, and the status of each conductor should be verified using the tester.

Step 6: Using the signal generator set to the range of the cable frequency, transfer a signal through the cable. Measure the downstream signal quality using either a power meter or an oscilloscope.

Step 7: The final step is to verify the signal quality against industry standards for a 75ohm coaxial cable. If the signal quality is within the acceptable range, the cable is considered to pass the test.


Testing a 75 ohm coaxial cable is essential to ensure that it complies with industry standards and provides the best possible signal quality to any connected devices. The testing process involves steps such as testing continuity and resistance and verifying the signal quality using a power meter or oscilloscope. With the right tools and equipment, anyone can test their 75ohm coaxial cable, ensuring that they experience the full benefits that the cable can provide.

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