Adding an External Fuse to My Multimeter!

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Introduction: Adding an External Fuse to My Multimeter!

About: Update 12 September 2017: A very special thanks to Sam Elder, a manager here at Instructables, who tracked down the cause of my lost publications and fixed the issue. Take a bow Sam!

My trusty fluke multimeter has been with me for 12 years. I love it. It's rugged and reliable. The internal fuses however are expensive and not readily available locally. As a substitute I soldered those glass type fuses into the fuse holders. This approach works well but when the fuse blows due to my muckup, it is quite a task to replace it.

Here is how I added an external fuse and holder to my veteran fluke multimeter.

Step 1: The Fuse and Holder.

I have lots of automotive fuses (which hobbyist doesn't?). These are rated to 32vdc and are perfect for my uses. I typically measure up to 24vdc with this meter so it's just right for me.

Step 2: Accessing the Fluke Fuse Holder.

Removing the battery cover gives access to the fuses. The one I have to replace is the 10A one. I unsoldered the blown fuse and made it ready for the new one.

Step 3: High Current Wiring.

Using heavy gauge wires, I soldered them to the fuse holder terminals.

Step 4: Connection of the Holder.

I soldered the fuse holder and used liquid electrical tape to insulate the exposed conductors.

Step 5: Notching the Battery Cover.

I cut a small notch to allow the wires out of the fluke's internals.

Step 6: Completion!

Now my hardy fluke has an external fuse holder that is easy to access on the field and I plentiful fuses to replace blown ones.

Yes I know the pretty factor is out the window but it works well!

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    4 Discussions

    I think this Fluke fuse has a very small resistor value, it is in serie with the probe and is there to protect against overcurrent. Automotive fuses are known for their lack of precision but small fuses (as the one on the right of your picture) exist in 5x20mm with fuseholders very small as well. Nevertheless, this is a good idea.

    1 reply

    thanks! I don't need high precision for my hobby work.