Instructables

How To Fix Your Missing Multimeter Battery Pack And Cable Testers

Picture of How To Fix Your Missing Multimeter Battery Pack And Cable Testers
תמונה 005.jpg
The other day while I was visiting a friend, I showed him some purchases I made on eBay. Realizing that I had purchased something that he had just laying around the house, something he claimed he didn't need anymore,  he offered to give it to me. The item was his old multimeter. He gave it  to me thinking that it was missing its batteries and didn't have its testing cables.
When I got home, I started checking it out and trying to add batteries to it. It was then that I realized that it not only was missing the batteries but also the battery pack. All that was left were two cut wires; so I found a few broken down electronics items that I could use to fix this multimeter device and restored it to working order. The following is a detailed explanation of how I did it.
 
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Step 1: Materials

two-sided tape
duck tape
thin piece of sponge
small piece of foamed plastic
broken remote control from a toy for the battery connections
some wires from an old PC power supply
a wall wart
soldering iron and soldering wire
shrinking sleeve

Step 2: Disassembling The Multimeter And Getting Some Parts From Broken Toys

Picture of Disassembling The Multimeter And Getting Some Parts From Broken Toys
Opening the multimeter :  My multimeter has two screws in the back of it and two clips on the top of the back piece.

Toy remote control :  This has metal springs and plates where the batteries sit which I used for my project.  I used a screwdriver to free the metal plates and spring with a little bit of force.
pfred22 years ago
Nice you got that meter working again. I'm curious how you knew what kind of batteries to put into it? By the looks of it I'd have guessed someone chopped out a 9 volt clip, if there were no other clues. With the Internet today I'd download the manual for it off the manufacturer's website. I always try to do that with stuff I get, that I don't get new. Hint, hint.

For probe leads go with clamps of some sort. If you need to probe you can always stick a little piece of wire into an alligator, or hook clip. Clamping straight probes to anything is hard. I find right angle probing a bit more comfortable anyways.

I think the only reason they make straight probes is well, because they're cheap. They have to throw you something when you buy a meter. Unless I'm checking something like a wall outlet I hardly ever use straight probes though. They're kind of clumsy.

Some of the meters I've picked up over the years:

http://i.imgur.com/8dalX.jpg

It is safe to say I've something of a meter fetish. I've more, I just didn't feel like digging those up for the group shot. You know, the deep storage stock. That is just my surface meters I have kicking around.
benji.abrams (author)  pfred22 years ago
Well the batteries I basically went with my instincts and use whatever I had laying around at home, But thank you for your great tip,
For the alligators and tester probes.

this is my solution : I took 2 alligator clips and 2 short pieces of wire red and black,shrinking sleeve and another 2 pieces of metal from a PC power supply power connection(which actually fits perfect with the probes).

soldered it all together and put the shrinking sleeve on the edge with the metal piece to insulate. that's it you have extensions with alligator clips 

PC power connection
Multimeter and extensions
When I make clip leads I hook the wire right up to the clips. I find the addition of probe handles a bit cumbersome? I've commercial clips that attach somewhat like yours do but they fall off a lot. What you've made is different though, with the little whip lead wire, so maybe it'll work out better for you?

Your idea is very inventive though. Gives me an idea to use those PC power connectors as mini jacks in other projects.
benji.abrams (author)  pfred22 years ago
The idea of using the connection came to me from my other projects which I used the PC power connections as mini jacks.
By the way my connections never fall off they fit like a really tight glove.

I'd like to see how you use the PC power connections in your projects
The last time I went into a Radio Shack and asked the kid working there if they had any banana jacks he looked at me like I was bananas. They did, I found them myself, but it got me thinking maybe I'd better find new sources for supplies.

The last electronics project I worked on was an ESR meter, I haven't gotten it to work yet, but when I do and box it up it might be nice to use some jacks with it.

I have a couple nice meter movements here and I need to do something with them. Whatever that ends up being I think there might be jacks involved.
benji.abrams (author) 2 years ago
P.s.
Really cool collection
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