DIY Emergancy BNC Cable

Sometimes when working with electronics, you may need a BNC cable to connect different test equipment together. If you are in a pinch and don't have a BNC cable but an oscilloscope probe, here's how to make one.

Note: This does not work on all probes, only ones where the cable and probe separate, and even then it depends on what connector they connect with.

Step 1: The Probe

This is the probe we will be using. As mentioned before, this will not work on all probes.

Step 2: Here's What to Do.

If the probe is detachable from the cable, unplug the probe from the cable as shown in the pictures.

Step 3: Connecting the New Connector

As you can see, the new connector is quite different from a regular BNC connector. Instead of going on the outside of the female connector and locks in place by twisting. This connector goes on the inside of the cable to make the probe less bulky. The disadvantage of this being it does not lock into place like a regular BNC cable.

Step 4: Does It Work?

As you can see from the pictures, this does in fact work. Do to the way the CRT works on the oscilloscope, you cannot see the full wave form on camera as the screen was flickering.

I hope this helps and thanks for viewing my first instructable!



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    3 Discussions


    2 years ago

    Nice idea, you should be aware though that oscilloscope probes don't use just regular pieces of coax, they use lossy transmission lines. That means your signal is going to get attenuated depending on the resistance of the cable, which can be several hundreds of Ohms. And that is actually the reason why 10x probes when set to 1x typically have such a low bandwidth.

    1 reply

    Reply 2 years ago

    Ah ok thanks for the info, this is important for people to know!