They are inexpensive and easy to connect. These meters calculate current flow by the voltage drop across the shunt resistor.
They have built-in shunts that should withstand measuring as much as 10 amperes. You must see shunt behind your volt- and ammeter. That small bridge bent from a thick wire on PCB. If there is none- this guide is not for you. You need a wiring diagram with an external shunt instead. Also when measuring current that exceeds 10A which can be handled with the internal one. They are basically the same.
There is a connector with thick wires and connector with thin wires. But coloring of wires vary. Amperage measurement is done by passing power through thick wires. Power to the meter itself is fed through thin wires. You can use the same power supply where your measured load gets electricity. I tried this on the first one in the list. It shorted out. If someone has some other info please let me know.
Also important! Wiring dsn-vc makes the most sense to me and seems to be most popular also. It also has clearly marked model name on the PCB which makes it easier to identify.
This exact one was in my original article. I have not tested this one myself. If someone can confirm this is correct I would be very thankful. From the info I found from sellers and one youtube video- this one has a bit tricky coloring. Nice tutorial mate. Regards, Albert. Have you same kind of volt-ammeter? Full morning trying trying, result headache.
Google to your website and bingo!! Thanks a lot!! That is correct. There is no longer voltage on the Blue wire. Any advice truly appreciated mate. I always thought the amp meter should be on the live cable in series with the load? In this case is in series still but on the negative side?!
It is now working mate. Sorry, my mistake. Thanks for taking an interest and trying to help. They just use the negative because it makes it easier to design a circuit that works. Excellent tutorial, with pictures that help in understanding. Thank you very much for providing such useful information. Good to hear. But keep in mind. If shunt is not built in, this diagram would be invalid and missing a shunt.
Mentioning it just in case. Again, thank you very much for the detailed article and the fine clarification. It works like a charm! Thank you very much, once again! Great tutorial. Yes, both. That shold show that you can use this with external power supply since power supply must not be over 30V but measuring range is much bigger.
My dual digital voltameter has red, black and green thick wires not the thin red and black to power the display. Chinese supplier unable to provide any advice or technical data. The display should obviously be in series with the load, but between which two terminals should the load be connected?
The third thick wire is obviously used to measure battery voltage of the circuit, but which wire should this be? Do you know if the ammeter can read both positive and negative current. I am pretty sure it only can measure one way. I would have to test this, but probably not. There is no place for minus sign anyway on the display.
As the one I am about to buy is specified to V and 10A it seems unbelievable. I mean, the amperage. Even the wire cross section looks too small for that, let alone the miniature connector the wires connected to. My seller offers 4 other versions of the meter with different configurations, color, etc. I could not see anything like that on your drawing, neither my seller speaks about, so I am confused. Thanks, Laszlo Budapest, Hungary.
Hi Janar, Thank you for posting the wiring diagram; I need it! I just received one of these fellahs. Purpose is to measure DC volts supplied to my model rail track. It would be nice to get a reading of amps supplied too. I connected up as per your diagram. In my situation the power supply and the load to be read are one and the same, ie the 2 rails of the track.
I get a correct volts reading, but the amps reading is 0. Any suggestions please? No current is flowing trough there. Looks good, but mine came with different wire colors.
Small red and black, then blue nearest the smaller wires , green then yellow. I found different sources with different answers. Looking at your pictures, my blue would be your large red aka positive polarity, but I cannot see the placement of the other 2. I saw one place that said green was voltage detection but when I tried on a battery it sparked and meter went dark. Just to make sure I used just red and black and seems to still work ok, so this is just a pain.
Could you explain how connect all five cables? I bought to of this meters and none are working, I made the connections like your pics. Are you sure they were exactly the same ones as seen on my I photos? If not- I would better not try before knowing right connections for you version. No need for messing with potentiometer in back.
They Show How much percentage battery is left. Introduction: Tutorial for Mini Digital Voltmeter. By mybotic Mybotic Follow. More by the author:. Description Put a voltage meter anywhere with this very handy display.
Specification Operating Voltage : 4. To do this tutorial, you will need to prepare as following below : MS Repeat if necessary until you get a real reading. Read the voltmeter. A digital voltmeter will clearly display the voltage on its electronic screen. An analog voltmeter is a little more complicated, but not too tough once you learn the ropes.
Continue reading for instructions. Part 3. Find a voltage scale on the needle's dial. Choose one that matches the setting you chose on your voltmeter's knob. If there is no exact match, read from a scale that's an easy multiple of the setting. If this isn't available, find one with a max of Estimate the needle's position based on nearby numbers. This is a linear scale just like a ruler.
For instance, a needle pointing halfway between 30 and 40 indicates a reading of 35V. Divide your answer if using a different scale. Skip this step if you are reading from a scale that exactly matches your voltmeter's setting. Otherwise, correct for the difference by dividing the printed scale's max value by your knob setting. Divide the number the needle points to by your answer to get the actual voltage. Where do you place the red and black leads of a voltmeter if you're measuring a typical US wall outlet?
Ricardo Mitchell. On a wall outlet, you have a longer side and a shorter side. Put the red terminal into the smaller hole, which is usually the hot side, and the black terminal into the longer side.
Not Helpful 4 Helpful 8. Include your email address to get a message when this question is answered. The instructions for testing wall outlets assume you are trying to detect the voltage "seen" by the appliance you plug in.
If you are trying to detect wiring problems, you may also wish to measure the voltage between the ground and one other hole. If you get a low result say 2V , that hole is the neutral wire, and you've just measured the voltage drop.
If you get a higher result say V or V , that hole is attached to the hot wire. Helpful 0 Not Helpful 0. If you're testing a wall outlet, test the vertical prongs. If it's a 3-prong plug, the round hole is the ground and doesn't need to be tested. Improper use can destroy the device, cause a severe electrical shock, or create electrical sparking that can start a fire. These are much more likely to occur in a wall outlet or other high-voltage circuit than when testing a low-voltage battery.
Helpful 7 Not Helpful 3. You Might Also Like How to. How to. Expert Interview. More References 1. About This Article. Co-authored by:. Co-authors: Updated: June 16, Categories: Cabling and Wiring Connection. Article Summary X To use a voltmeter, set the device to measure voltage and choose the type of electrical circuit you're working with.
Italiano: Utilizzare un Tester. Deutsch: Ein Voltmeter benutzen. Bahasa Indonesia: Menggunakan Voltmeter.
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