I’d expect a separate current shunt for such amperage, but also for 10A. I always thought the amp meter should be on the live cable in series with the load? I do not understand why, as it is still the same current that flows? more information Accept. All the diagrams were somehow too technical for me. In this article we learn how to build a digital voltmeter and a digital ammeter combined circuit module for measuring DC volts and current through different ranges, digitally. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. I am pretty sure it only can measure one way. However, most power supplies don't include power monitoring systems in them, meaning the units don't incorporate voltage or current meters for displaying the relevant magnitudes. Just to make sure I used just red and black and seems to still work ok, so this is just a pain. They all can be wired such way that you don’t need a separate power supply for the electronics part. I have not shorted mine so I am not sure. Your email address will not be published. I have mentioned that in “Wiring basics” paragraph. Will see about that later. The digital multimeter is convenient handheld design, can clearly display the datas for its backlight. S1 which is a DPDT switch is used for selecting either the voltage or the current reading as per the users preference. There is no memory function and no automatic calibration. Later when in service with a grid tie micro-inverter I can look at the Vmpp and Impp as the sunlight changes angle or clouds roll in. Yellow line and black line will be switched to the measurment circuit. Small red and black, then blue (nearest the smaller wires), green then yellow. But keep in mind. P1 helps to compensate the regulator operating quiescent current consumption value, which results in a minor negative deviation across their voltage range, which is in turn effectively compensated by P3. I tried this on the first one in the list. Privacy Policy I was using RED with RED and BLACK to Black with the BLUE serving the load as negative. Hola, mi consulta es la sgte. Hi. I connected up as per your diagram. I am wanting to insert this DVM into several power supplies, none or which exceed 30v, to measure both voltage and current. Hi again.. im wondering its ony 3x 7 segment. It’s like the ground (black wire) goes “through” ammeter and + is connected directly. Free from Parallax errors, has automatic range selection and high input impedance. Fit for schools, factories, families and amateur cordless lovers. SIMPLE CONNECTION AND EASY TO USE - Handheld, portable, small, exquisite workmanship and long service life. i don’t want to read the load ampere - Should measure flowing current 0 to 10 amps. You must see shunt behind your volt- and ammeter. This button opens a dialog that displays additional images for this product with the option to zoom in or out. Your email address will not be published. I like t:his type of circuit,and i did build several 30 years ago and they are still working well, so they are simple an reliable.For the Fun but also because of nostalgie,i want build now 2 module based on your circuit for Volt and Amp. In that case the bridge rectifier B1 can be eliminated. Correct? Do you know if the ammeter can read both positive and negative current. Smaller in size and cost-effective. A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current. 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). The displays are powered by individual transistors which make sure that the displays are lit brightly. Can you explain that? Then the small Yellow wire, if I also connected it to the + battery terminal caused the top display to register 9.2 volts. Manufacturers, But then you can only use a maximum of 30V since it’s the maximum operating voltage for the meter itself. No current is flowing trough there. It shorted out. There is no place for minus sign anyway on the display. If you order digital 100V/10A volt- and ammeter gauge from China or other markets – it’s most likely one of the following. Do you have load connected between + side and ammeter’s blue line? Your picture shows 2 power sources (I think) in that you have the small red and small black going to a 9v battery and the small yellow in that bundle going to the power supply positive but the pictures is not clear. Albert. But coloring of wires vary. 10A / 100V volt- and ammeter wiring with thick red, black and yellow wires and thin black and red, 10A / 100V volt- and ammeter testing, DSN-VC288, Hi. Please could youg guive me an way reliable where i will buy these components at a resonable price ? Sorry Rikseng, I don’t have the design with me at this moment…. Select Option. Any hope to fix? And minu pole goes trough meter – fat black in and fat blue out. From the info I found from sellers and one youtube video- this one has a bit tricky coloring. They are joined indeed together and mystery object is insulation tape that joins them. Hi Swagatam I am trying to measure Ac Voltage and current using Atmega32 and send the corresponding values to a remote user via SMS using a GSM module can you provide some assistance in this, I am stuck at voltage and current measurement part. Its uses is limited to voltage measurements in low impedance voltage sources (ex. It would be nice to get a reading of amps supplied too. I have a question tho that has been asked before but I still dont quite understand the awnser. When you say “Black wire (ground) is not needed. To ensure we are able to help you as best we can, please include your reference number: Can be used to measure AC/DC voltmeter, ohmmeter, diode. Do you like my posts? 2) You don’t need 2 power sources if the voltage is not exceeding much over 30V. Thanks for the guide. Would have to pick the right values po protection components to minimize the distortion to the accuracy of the reading, and still provide enough power for the meter. P4: For enabling full scale calibration of the voltage range. Thanks. Notify me via e-mail if anyone answers my comment. Wrong place to ask this. 2. With the selection switch held towards the Amp range, the voltage drop acquired across the sensing resistor is applied straight over to the points of the Hi-Low inputs of IC1 which is the DAC module. I also see there is a volts trimmer there too, in case calibration drifts. Does it mean that i have burned it? 600. These meters calculate current flow by the voltage drop across the shunt resistor. Sorry, my mistake. Yes, the instrument I’ll buy has a build-in shunt, as you mention in the second sentence of your article. Last Updated on July 8, 2019 by Swagatam 25 Comments. Best regard and thank for your clear article. Thanks, Yes, both. I made a quick test on opening the packet, using a 9V battery connected with the small black wire connected to negative side and the red one to the positive. I will cover wiring for all of them in this post. The trouble begins because the positive of the negative part shares connection with the negative of the positive part (they have a common ground). The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. I don’t understand the intent of your question. With your diagrams I verified my connection and finally found that load was simply too low. Chinese supplier unable to provide any advice or technical data. I found different sources with different answers. No need for messing with potentiometer in back. Electrical parameters like voltage and current are inherently associated with electronics and with electronic engineers. It’s probably because they have common ground for measuring etc. Send me an email when my question is answered, We're committed to providing low prices every day, on everything. . There are basically two methods to defeat this disorder. 75V would fry the meter. But I assume you will use this right. Important! How can I wire these kind of voltage/current meters?? My seller offers 4 other versions of the meter with different configurations, color, etc. 1 – Digital Voltmeter and Multimeter See more details at. As you can see I have included 3 different types of meters here. | Wouldn’t be able to measure low voltages very well if I used the panel itself in place of a battery. Hi, how would I measure a power source with no load with this device? The circuit employs IC 3161 and 3162 for the required processing of the input voltage and current levels. forty five + = forty six. 1) Interesting. I don’t fully understand your question. Please could you give me on way reliable where i can purchase these components at areasonable price?
Can be used to measure AC/DC voltmeter, ohmmeter, diode. That was comment about powering chip/volt- and ammeter itself. i just wan to read the rest ampere left in my battery When looking for this device, it isn’t very clear what the voltmeter displays when voltage is < 10V : merchant photos often shows 3 digits but some user photos shows only 2 digits. Not very popular anymore I guess since can’t find many offers for these. take voltage and amperage readings and pass them to an Arduino or any microcontroller)?? I bought one of these ages ago with the blue and red wires and was really struggling with the wiring. always possible to unsubscribe. I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. Consider signing up for e-mail updates. I saw two little bolts in the back, do you adjust this bolts before turn on your volt/amp meter? This limitation only applies when using the same power source what you are measuring. Although digital voltmeters do not fully replace analog voltmeters, still there are many places where analog voltmeters are preferred over digital voltmeters. In France all suplyers consider these components OBSOLETE it’s very shame!! 100V / 10A DC volt- and ammeters with differently colored wires. I needed to put the meter between power supply + and LOAD, and not between LOAD and power supply – , as is always shown in the circuits, but this does not work.

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