2-in-1 Voltmeter and Ammeter – Cheap Chinese Electronics

During the build of the CNC I decided to cheap out on a lot of the parts and get them from china instead of the UK and save some money. I was in no rush with the CNC so I didn’t mind waiting for the postage which wasn’t actually that bad.

The one great problem with this is the lack of wiring diagrams, schematics and general instructions!

I plan on document a lot of my troubles on my site to try and help other people out with wiring up a lot of these things and save you all the time it has taken me to figure this out!

The first problem I came up against was the 2 in 1 voltage meter and ammeter. It looked nice on the listing on ebay, red and blue display, 0 – 100volts and up to 10 amps measurement – just what I needed.

This is what it looks like:

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It looks nice! Here’s the back:

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I have noticed that there are a couple of different versions of this on the internet differing if you get it from aliexpress or ebay or Amazon and which seller you get it from.

I received mine in the post and they come with nothing!

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If you look closely you can see a few little things with this, the pin is bent and it came like that! There is solder on the outside of the black cable, it looks like it’s dripped in the factory. There is also a plastic clip missing, I think this was from the postage as well as the pin bent. This is only one, I’m yet to unpack the other one to see what condition that’s in. Postage wasn’t that bad, it only took about 15 days to arrive including weekends.

After some searching on the Internet I have found some basic information in Chinese:

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This is the only English information I came across! It seems to sort of make sense. Amp measurement has to come from the negative line otherwise you get the good old magic smoke. I’m not sure about the rest, I’ve still got to experiment with this.

They’ve only just popped through the letterbox so I’ve not had any time to play with them but I’m planning on trying to set something up tomorrow with them.

The input voltage for the meter says between 4v and 30v so I’m going to hook it up to my bench supply and see what it can handle, then I’m going to hook it up to my CNC power supply and a stepper motors, run a few test patterns on the machine and see if I can get it measuring amps.

I’ve ordered a couple more just incase I magic smoke this one. Keep and eye on this post as I will be updating it when I can get things working!

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