Is there a way to test coaxial cable?

TESTING COAX CABLE WITH OHMMETER



You could measure how much resistance the circuit has with an ohmmeter. Connect the ohmmeter to the cable. If it’s working, there should be a low-to-moderate resistance reading of 75-100ohms. If the reading is outside of this range, it may be time to replace your cables.
 

How do I know if my coax cable is active?

You can test your coax outlet’s signal by taking your cable modem from cable outlet to cable outlet manually, and plugging it in to each coax outlet to verify a signal and connectivity. If your internet modem connects like normal, that means a signal was detected. If it doesn’t connect, then you have no signal.

How do I know if my coaxial cable is bad?

One way that you can check if your coax cables go bad is by using an electrical multimeter. An electrical multimeter can measure the abilities of multiple pieces of electronic equipment using many different calculations. First off, you can use your electronic multimeter to do a resistance check on your coax cable.