Electronics > Beginners
Good multimeter to buy
bob91343:
I easily built a 4 wire Ohmmeter with a normal DMM and a wall wart. I can read, I think, 0.01 Ohm with it.
It's simply a current source with an LM317 or something. Google DIY low resistance meter.
ledtester:
--- Quote from: bob91343 on June 02, 2019, 04:42:53 pm ---I easily built a 4 wire Ohmmeter with a normal DMM and a wall wart. I can read, I think, 0.01 Ohm with it.
It's simply a current source with an LM317 or something. Google DIY low resistance meter.
--- End quote ---
Also search for milliohm meter project on youtube.
ejeffrey:
--- Quote from: mqsaharan on June 02, 2019, 12:15:33 pm ---
--- Quote from: ejeffrey on June 01, 2019, 03:20:12 am ---I really want a handheld dmm with 4 wire ohms mode, but I have never seen one.
--- End quote ---
If you really want one, may I suggest to look at some of Gossen's offerings like:
--- End quote ---
Nice. Too rich for my blood, but I'm glad they exist. I will probably continue to make do with an external current source and the millivolts range unless I find a great deal on such a meter.
n5al:
--- Quote from: german77 on June 01, 2019, 01:41:34 am ---...or a seller of 121GW that will ship to Mexico and not double the price?
--- End quote ---
I share your pain about high shipping costs to Mexico. That's why I always make a list of things to buy during the couple of trips I make to the US every year. :)
Surprisingly, on the EEVBlog store, it shows charges are only about AUD$ 30 to ship a 121GW multimeter to here in Guadalajara. I suppose Aduanas would try to collect the additional 16% IVA before delivery. Maybe I'm missing something here, because I really expected to see a MUCH high shipping cost, like the one you mentioned in your post.
Connecteur:
I was intrigued by the multimeters on AliExpress that sell in the $1.70 range, so I ordered some. They work fine, and accurate as far as I've tested them, but I can't see any reason to buy these things, when for a dollar or two more, you can get a much nicer one.
The last few corners have been cut making these multimeters as cheap to build as possible. The test leads are thin, flimsy and soldered-in. The plastic case has sharp edges that they didn't bother to grind off, and the cover is very difficult to open. Yes, it has a flip-cover for that price. Still not worth buying in my opinion.
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