At last a clear and very concise description of the wiring of this meter. Its a shame that the multiple sellers of these meters don't supply similair instructions. Perhaps they should all provide a link to your instructions?
Amazing content. I designed an enclosure that used this module before I ever had a chance to play around with it. When it arrived, I had no idea what I was doing, now I do, and I don't have to 3D print another enclosure!
Wow this really is the best overview of this little DC volt/ammeter. Above and beyond, man. You even measured the dimensions (there are tons of schematics out there but are vague on where they are measuring).
One thing you did not mention was how to zero current meter. These meters do not read negative current. I had one of these units which had a bad zero! i.e. It needed about 1 amp to before the meter started to read. If you had 2 Amp then meter read 1.00 Amp i.e. 1 amp zero error. 1. To fix this link the 2 pads just above the main chip where it says ADJ-Z (see 15:42). 2. Apply power to meter for 1 second. 3. Remove link and re-power meter This zeros current meter and meter then measures current correctly. BTW your zero was OK so you did not need to adjust zero.
When you say 2 pads just above main chip near the I ADJ-Z are you able to explain a little more. I believe mine needs zeroing but don't know where to short across
@@justinryan3365 Hi Justin: At 15:42 you can see 2 unsoldered pads. (3mm above main chip towards edge of PCB) 1. Unplug current lead to force zero amps 2. Short out these 2 pins then turn power ON. 3. Turn power OFF. 4. Remove short. 5. Re-power meter. 6. Meter Zero should be reset. Peter
If you are 3D printing, I have found that the cutout needs to be 26.8 x 45.4 (thickness of 2.5mm worked well for me) - I also chamfered the inside cutout by 1mm or so. Hope that helps
There is many version of this madule.the best kind has three thick wire and 2 thin wire.but most has 2 thick wire and 3 thin.and some of them has 4 digit and more percise
Excellent tutorial, it is so amazing to see you selflessly make these videos so that people can learn from it without any doubts. What amuses me more is that you take care of the minute details while explaining as if you are reading the viewers mind. Really wonderful. Thanks a ton for these tutorials. I am from India and I have become a fan of your tutorials.
@@robojax Agreed!! Your videos are very helpful!! I have both this 10A meter and the same one but with a pcb ontop with built in shunts for 20A. It did not come with termination instructions so I am lost how to connect it!...it seems to be a great little meter and rated for both 20A and 30A...either way...thank you for the videos!
Have you sen these? SDENSHI 2 in 1 LED Voltmeter Ammeter, Digital Multimeter Display Voltage Current Tester, DC 30V 20A/30A Voltage Amperage Meter Panel Gauge - Red-Red, 30V30A
Thanks for the Shunt calculation. Were you by any method able to determine what the digital ammeter impedance is. Is this a 100 mA or is it actually a micro A actual reading, I am looking for a meter with 1 mA range to replace an analog meter in a tube tester and need some more info to calculate if I need an additional series resister to match the analog meter resistance. Thanks
You are welcome. this module won't work for you as the resolution is about 50mA so. I have review of a product th-cam.com/video/Mmxw7T29Z6k/w-d-xo.html that has different displays at milliampere. So get from the same manufacturer on AliExpress.
Hi, do you have a schematic for wiring a 50a 75mV shunt to volt/ammeter when using 4v to 30v power to supply meter but measuring load from another source?
Nice and informative video thanks for the same to guide people interested in electronics, When you use a common power below 30 volts DC to power the Voltamp meter the thin black wire should not be connected to the negative along with the thick black wire as it will burn and damage the meter at higher current , for using the meter for voltage higher than 28/30 volts a separate power for the meter using the thin red and thin black wires to be used I have a couple of meters 3 digits & 4 digits on my variable bench power supply & also for my auto cutoff battery chargers, very nice meters from Amazon & Ali Express It has an accuracy correction factor of 0.8 to 1% plus 2 digits for voltage, the amps usually is almost correct but can be adjusted with the “ I ADJ “ pot as explained in this nice video All the best to you
Hi, what happens if you have the ammeter set up to measure the current going out of a 12V battery and then you charge the battery so the current flows in the opposite direction. Will the ammeter drop to 0 or will it show that the current is reversed ?
Thank you sir! The ammeter connection was confusing me because of the common negative for both the volt meter and ammeter parts. I didn't realize that you are only able to measure the amps on the negative size of the load when using a single power supply. Great explanation!
Hi, I have made the video to answer such questions. by asking such question you made me watch my video. I have peroperly shown the wiring digram and explained every wire. please watch.
Dear Sir, I'm writing to you from Belgium and my home language is not English, so plse be indulgent with my grammatical faults. Many thanks for your interesting and well presented video about the installation of your digital 10 Amp meter and in combination with a voltmeter. If you could spend some time to read me, it would be great. I already have since 40 years an analogue -50/0/+50 Amp gauge from Smiths in use. This was already used in different cars. Now it is installed in a VW Golf MK2 GTI 16V of 1988. It is a gauge functioning with a shunt build inside of it. Now the gauge is becoming a little bit tired and it is not anymore as sensitive as before in order to indicate the uses of small amounts of amperages! This gauge is indicating the consumption of the total amp's of the loads used and also if the alternator is strong enough to produce some extra current to the battery in order to compensate the used Amps by the loads, but also to load some extra amp's into the battery, if necessary. I heard that even when the battery is fully loaded, there is still about 0,5 Amps of current loading the battery? Of course the Amp meter is registering the total electricity consumption of the car, but the starting motor, which is consuming too much amp's, (and would destroy the amp meter), is excluded from the circuit. Now come's finally my questions. Please tell me if I'm wrong or not!? Is it possible to use a digital Amp meter together with an analogue Amp meter? Because, how ever I would like to keep my analogue Smiths Amp meter. Is it possible to connect a digital AMP meter with a shunt in parallel to the two connecting points of my Smiths amp meter (one connecting point has two big wires coming together and the other one has only one big wire), or do I have to use separated (smaller) wires coming from the fuse box or battery or from the alternator? I do not think personally that it will be possible to realize this, as when I want to measure the Amp's with my digital portable Amp meter, I first have to disconnect all the big wires from my Smiths Amp meter gauge, as otherwise I can't measure any amp's at all. Also If I disconnect the big wires from the connecting points of my analogue Smiths Amp meter, the car will not start nor provide any electricity anymore, as the circuit is interrupted! It must be in this case a serial connection, because parallel is only for the volts, isn't it? But in all this I don't have any knowledge at all. Can they possibly work together in harmony or not? Do a digital Amp meter needs a shunt above 10 Amps? But an analogue meter is still working with an internal shunt till 60 Amps, or maybe even above it? My digital portable Amp meter can register amperage's till 20 Amps but only for a short time? Nevertheless the shunt inside of the portable Amp meter seems to be as thick in diameter as the one installed inside of my Smiths gauge, with a bigger reading of 50 Amp instead of the 20 Amp? And also what do you think about a digital Amp meter with a hall sensor? Is this a better and easier solution? Is it less accurate than a shunt, or can't he read the consumption of electricity and the load of the alternator together? So dear Sir, I don't know if my logic is totally correct, but I would like to receive some additional help and expertise from you about the connection and possibilities with a separated shunt and his digital meter (with a more precised Amp's reading), and in combination of still using my old analog Smiths gauge? Sorry for beeing so long, with my questions, explanations and comments. Many thanks in advance for giving me (if possible), an answer! Best regards, Christian.
Hi Christian, Thank you for your comment and detailed explanation. Your English is perfectly clear. 1) Is it possible to use a digital Amp meter together with an analogue Amp meter? Yes you can use it BUT in series. So both metes can read. 2) And also what do you think about a digital Amp meter with a hall sensor? Hall is better because we don't needs shunt resistor and it is ALWAYS the best way here are my videos on current sensors th-cam.com/channels/kcBSig_Iu4ZnAIeCeG1TVg.htmlsearch?query=current and here are my power meter videos th-cam.com/channels/kcBSig_Iu4ZnAIeCeG1TVg.htmlsearch?query=power+meter
How can we set current limit while using this display. Short circuit on buck but it's not being displayed when red wire for load from display and positive from buck is shorted. It seems wrong my since these are technically our outputs, how can we display Current limit while adjusting for CC??
this module just shows the current. If your power module has CC, then you can short cercuit the output. So do it like this. I assume your power supply can't output more than 10A. 1-connect this meter at the output of your poower module 2- set the CC to minimum. 3-shoort circuit the output of the meter and keep it short cuircuitted 4-Adjust the current. and you will get the limit.
Great Video! Question, I am using a single power source for my meter but I want to be able to turn off the meter while leaving the line power on. Do I interrupt the yellow wire for a switch? Thanks
As I shown inside this meter we have a think wire as shunt resistor so it does not matter if you connect the yellow wire or not. It will pass the power through.
si pudieras hacer un video de como regular lo que marca el display y a quien hacerle caso si a la fuente de alimentacion que marca un voltaje y corriente o hacerle caso a lo que muestra el display del medidor osea quien da las mediciones mas verdaderas?
Hi, can It read negative current? I have a task to Control a single lipo battery powering a Power bank module, the forward current would be a phone being charged, and the reverse current would be the Power bank module charging The lipo.
Dear i have question please help i use to power it up with invertor battery it may have some time 14.5 volt while one charging so will work or it may be burn?
Hi, I need to check the battery charging amp using a solar panel. Can I use this meter to check how much current the solar is pumping to charge a 12volt battery? Thanks
Thank you. I have not tested it. But I would advise against it. The higher the current, the higher the voltage appear across the shunt and I don't know if there is prevention mechanism there.
Could a 100w 2ohm load resistor be use in this same circumstance? For testing purposes I mean? I'm currently designing a 24v 10amp project and only have a 100w 2ohm load resistor at my disposal!
you may start with this project using Arduino th-cam.com/video/9jwCc7uPGoc/w-d-xo.html then we have tutorial showing you how to use it with LCD dispaly. If you are not familiar with Arduino, Here is $200 Arduino course for free Arduino Step by Step Course (over 100 video lectures) Starts here robojax.com/L/?id=338
how to adjust ammeter reading. describe tool and procedure more clearly. i see a small flat screwdriver but i am guessing how much to push, use the corner?, please thank you
I must have shorted the thin black wire (it got hot) and now the Amperes stay at 000 all the time. Do you have any idea how I could test or fix this ? Thank you.
The current is measured from shunt which is about 50mV which I have shown in video. if you miss up the wiring, it is possible that higher voltage gets into the circuit and might have killed the resistors that are protecting the module. Now it is very hard to repair it unless you have exact module, using multimeter check all resistors close to the shunt and compare it with the good one and if you are lucky you might find it. There is another possibility one of the chips reading the voltage is dead. good luck
Excellent video, i have a question please help me , i have a yellow cheap multimeter dt830d i want to check measure current between 6 to 8 amps continuously in series while charging the battery is that possible ? please help how to do it also if not possible let me know how much maximum current ampere i will check continuously on that multimeter for hours thank you in advance
@@robojax ok if i will continously connected without shunt on 1 amp 2mp or 3 amp is that ok, means how much max current i can check without shunt for long time period thanks friend
@@robojax Well I tried it and it worked. I am not using an independent source to power the meter. I attached the thick black wire to the negative side of the source, the thick red to the negative side of load, the ground terminal (source) to the positive side of the load, and the combined thin red and yellow wires to the positive side of the load. Of course it does not display a negative sign but DOES display the magnitude of the negative voltage which is really all you need. Just label the AV meter as negative voltage.
Excelente tutorial es muy instructivo,seria muy bueno que todos los demás yotuber en sus vídeos de reparación le pusieran la opción de subtitulos.Saludos desde la Isla.
I got a question plz tell me if these meter are protected against short circuit in the output or not?can i use it with battery source without relay protection?
this can handle 10A and about 12A for few seconds. Short circuit means ∞A and of course it can't handle it. this is should always be in series with the load.
@@robojax tnx so what do you advise for me to make and protect my battery pack with this meter ?ive tried relay but it doesnt cut off when im shorting leads
Nice video. I have a question. What is wrong if I have it connected right(like iit is shown in original schematic), but it is not showing the current. It displays just 0,00A
@@robojax it shows current just in one direction? I tried both directions and it didn't work but now it works in one direction. It shouldn't be because of the overload.
Hi. Thanks a lot for making this detailed video. I watched a ton of other videos and none of them helped until I watched this one. One question that I hope you can answer, what would happen if I were to draw more than 10 amps? I have this connected to a 12v power bank which also has a 220w inverter attached to it. Will it survive a 220w load or will it blow?
Hi, you are welcome. I have not tested it but higher current perhaps there will be 1A or more tolerance but for 5 or 10 seconds. This is what I have tested but longer than that I am not sure and not advised.
There are many versions, and can have problems because of badly written firmware. The display refresh can be much slower than advertised such as 800mS instead of 300ms. The voltage and/or current can have bad tracking accuracy despite being zeroed and the gain trimmers adjusted. The ones that have poor current tracking will also jump over the "0.01"amp reading. The meters I got from Banggood have good current accuracy but poor voltage tracking. If I calibrate at 5V, they will display "31.1" when I apply 30V. And I am powering the meters from constant 5V to the thin red wire.
Anything that is sold should meet advertised specifications regardless of price. The problems are unnecessary and easy for the manufacturer to correct. Most annoyingly, they used to be good. I can fix the voltage problem by putting a 4.7M resistor from 3.3V to the voltage ADC input pin on the micro but the slow refresh makes them useless to me. Example, drive.google.com/open?id=18-L6NMsQPRj__3B3tpa6mP_4cYvvMNtz
It was a very useful video, I have a question about my problem, I would appreciate it if you could answer it. If possible I need the model number of the diode next to the 7133-1.
I don’t have this on hand now. Do google image search I am sure you will find high ready image. Besides I am sure it should be a regular or a schottky diode
Hi I've got a quastion. Is it possible to use this volt and ampere meter to check voltage and current from 3 different power sources? I'm thinking of using some kind of switch with 3 inputs and 1 output. Please help me
Hi, making such thing is possible but not easily possible with this display. this is your best option th-cam.com/video/3C33DpcSwIw/w-d-xo.html with TMS1637 th-cam.com/video/DuamjlstOKM/w-d-xo.html
Thanks for the video. Mine was a little different with a two lead small red and black, and three thick black,red and yellow. It powered on with the small red and black attached to 12v. I put the big yellow onto the 12v and got a magic puff of smoke. This surprised me as I though if yellow was the voltmeter line it would read 12v else if part of teh ammeter circuit it would not read. I would appreciate anyone telling me how mine worked, what caused the problem, and potentially how I could fix it.
Thank you very much. I though the device could be used as panel meter so I supplied 15Volts to it last night and it vent off, burnt. Mine is PZEM-050 with a specification: DC 5.6 - 100v the current is : 0-100A it came from kikuu with 100A shunt resistor. Please is it good for panel meter??? to measure both voltage and current as well as wattage ?? you are now my teacher so i want to know. Have a nice weekend.
Great video I was confused now I'm going to have another go. My question what happens if the power supply is reversed will it show a negative or will it fail?
You can zero the current range by jumping the "I-ADJ-Z" holes while powering up. Use the "I-ADJ" trimmer to correct the span. It may not be possible to get it perfect depending on what version you get sent.
@@robojax Hi thanks. I have one of these. I just need to work out the amount of copper plate to use. www.ebay.co.uk/itm/DC-100V-100A-Voltmeter-Ammeter-Blue-Red-LED-Dual-Digital-Volt-Amp-Meter-Gauge/283621092127?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 I'm not sure which one to watch.
Excelente tutorial. Gostaria de saber se este produto mede tensão invertida assim como o multímetro e indica a inversão com algum símbolo no multímetro quando se mede uma tensão negativa ou se equivoca na ligação da polaridade o multímetro indica com um sinal negativo, no meu projeto gostaria de usar um desses em linha com um pack de bateria o que indicaria o quanto de tensão e corrente está saindo e em carga o quanto esta entrando negativamente...Grato...e viva o compartilhamento...
Imaginei, tinha essa dúvida pois ele tem uma linha de alimentação separada da linha de medição... posso por uma ponte de doidos polarizando corretamente a entrada e ajustando o medidor compensando a perda de tensão na fonte o problema tende a ser o amperímetro que usa um shunt... muito obrigado... terei que fazer testes, ou procurar um que aceite inversão... grato pelos seus esforços...e viva o compartilhamento...
I have very similar (same) volt/amp meter units, but they are way off when measuring current. I set the ammeter trimmer at 1.00A but when the measured current goes higher, the ammeter shows much higher. For example, at 2A it will show about 2.50A, at 5A it will show about 6.5A, and so on. Same but opposite if I go below 1A: at 0.5A it shows maybe 0.3A. It is very non-linear. I was surprised to see that yours is accurate/linear over a range of currents. Do you know what could be the problem?
Hello Edin, I am not sure what is the difference bewtween yours and mine. this has no brand name. And that is the problem with most chinese modules. If they had a brand you could track it and find the issue. Now everyone produces them and have no standard or design rule.
Hi, This type of meter uses a shunt to measure the current in the ground wire. The thin black wire is also ground. You must NOT connect the thin black wire unless you are powering it from a separate isolated supply such as a battery. The video is misleading. Simply disconnect the thin black wire and it should read correctly.
@@steve6375 Thank you, Steve! The thin black wire IS disconnected, so that doesn't help. I actually tried this unit with a separate power source and it is then accurate. So, the designer/maker of my particular module didn't solve the problem of shared supply and measuring lines, and I will have to find a way around it, either by using an isolated DC-DC supply, or somehow taking differential measurements.
@@edinfific2576 Edin Fifić yes, my measurements have this problem too. when the power supply and measurement are the same, the ampermeter is show higher. I had to put 2 cellphones batteries to power the measurement. and now this accurate. and I'm not worried about drain the batteries. Its measurement works at very low power, and batteries are not necessary for a month's charge.
@@edinfific2576 If the thin black wire is disconnected then it should measure current accurately unless you have also connected a different gnd\0V to the same circuit. e.g. If you have a +5V and a +12V output with a meter on each output and you connect it to the same circuit it will not read correctly. These types of meter measure current in the 0V line and so you can only have one meter in the 0V line.
NB - On the ones I use the two black wires are connected together on the PCB. TIP - removing the PCB makes it easier to fit the unit in a panel. If you reverse the current the unit reads zero amps, I have two of these connected back to back in a PV solar setup, one reads current into the battery, the other current out.
Your explanatio??is good. One doubt. If the operating voltage is not steady, will it not affect the functioning of the meter ? How about providing a steady voltage with the help of any 78 series (7805, 06 or 09) ?
it can't be of the same type when it comes to 100A. for 100A you will need an external shunt resistor. See meeters th-cam.com/users/robojaxTVsearch?query=meter
you might have changed the shunt resistor to half size and it produces half the voltage which the current value. if you have not changed it, then, some resistor on the path from shunt has been damaged and now it dropping the voltage to half. So check a few resistor be comparing them to the written value. it would be hard to measure which they are in circuit. for proper reading they should be remove and measured. I am not sure if this is what you would do.
My current measurement is wrong .it is 2-3 amps higher and it also varies (sometimes 2 amp higher ,sometimes 2.5amp higher when voltage changed etc).I checked with multimeter.i also tried adjusting trim pot but amp is too inaccurate to correct with pot .how can I fix it
Thank you for the video very interesting I have this meter but would like to use it to measure a lower amperage I would like to measure 0-5ma is there an easy way to convert the meter please Thanks if you can help Bob in the Uk
You are welcome Bob. No it is not possible because this device has been set with fixed value of shunt resistor. in order for you to measure lower current, then you will need much smaller resistor. You would have to use other types of devices such as current sensor using Arduino and I have a videos on that topic th-cam.com/users/robojaxTVsearch?query=current_sensor Ahmad from Canada
what for at which part? I have posted 300 videos and don't know exactly what you are talking bout. please type the time like 5:31 or something so I can click and see. I will replay if I understand the question. Thanks. Ahamad from Canada
I just watched the video. You can see that it show only 2 decimal place. so smallest value for the current is 10mA. I have added a page for this with links and resources in the description.
I dont know why, but the same type meter that I bought can mesure up to 10+ amperes, may be max to 20A. I use it to mesure my solar panel, and it show the curent is 16a.
This type of meter uses a shunt to measure the current in the ground wire. The thin black wire is also ground. You must NOT connect the thin black wire unless you are powering it from a separate isolated supply such as a separate battery. The video is misleading. If you connect the thin black wire it will affect the current reading. Simply disconnect the thin black wire and the Amps reading will be correct.
which part is misleading? it perfectly works and correctly shows . Perhaps you don't understand how current is measured. Watch the video again and do not escape.
yes. my meter has this problem too. when thin black wire is connected the ampers are double. but when disconnected ampers are correct but voltage shows lower😫
@@robojax It works for you because you are using a *battery* which provides an isolated power source. But in the real world, people don't connect isolated power sources to the meter, they use the same power source to power the meter. In this case, you must NOT connect the thin black wire. rmprepusb.blogspot.com/2019/11/everyone-is-wiring-up-their-power.html
@@robojax Yes, @steve6375 is correct. If you don't have two isolated power sources, you must disconnect the thin black wire. This is documented in product reviews as well as Q&A. I did not get double readings as some have stated. I got about half of actual and I broke the trim pot trying to adjust, which is impossible. Your video is excellent, but you only did one of the wiring scenarios.
bueno no entendi que quisiste hacer ya que esta editado el video se notaba al medir el shunt y porque midio 48.7 y en el display solo 3.3 no entendí la exposicion del tema.
Hi, because may be you did not turn ON the subtitle in your language. that 48.7 is 48.7mV. There is a relationship between the shunt voltager and the current.
I need to measure approx 30 Amp Is it possible to measure by this 1. Can use as another shunt resistance externally to measure ampere not exactly same ampere but at least a scale value of current so that we understand current. In normal multimeter we did like this to measure current, we measure current in externally thik wire by just putting our meter prod any 2 points at gap of 1 meter and it shows ampere in miliamps we just understand calibration that how much miliamps shows during actually known 1 ampere nd then we do multiplication nd here we get actual ampere, so like this is it possible in this meter
Hi, the it is very clear from the title "10A" is the limit. you can use this meter th-cam.com/video/Mmxw7T29Z6k/w-d-xo.html or all other meters that I have done the reviews here th-cam.com/users/robojaxTVsearch?query=meter
Hi, can u do a video on arduino flowmeter, which has a LCD display. It is also link to a bluetooth, which can be view on mobile phone. I very interested to learn from you how to do it. Thanks
Hi, this is quite a project. first flow-meter, then LCD, then Bluetooth and viewing on phone. so it is 3 project in one. I don't have the flow-meter either. so won't be able to make it. :-(
Thanks for this, I had one die, a 4 bit version (4 digits) I wonder what happened i had a lithium cell + tp4056 charge/discharge module on it. I never had issues with this setup then recently it wouldnt power on, after some investigating (i had it wrapped in heat shrink) I noticed the tp4506 module getting supper hot, it was going to blow! i scambled for a set of plier to cut the battery and managed to do it before it blew up in my face... after taking off the heatshrink i noticed the output of the battery on the t4056 module had lots of extra wire comming off it, which got squished up against an IC creating some kind of short I believe. Then i remember i remounted the display with hot glue and that could of brought that wire into contact, clip your wires after you you solder them on i suppose, there is a chance they can find a way and touch something they shouldnt.
@@robojax Maybe...but if they only want to measure voltage, they wouldn't be buying a volt/ammeter, would they? Also, if you do some research on these units you find single-supply circuits that have the thin black wire disconnected - that confuses people who have seen your connection! BTW There is an internal connection between the negatives.
In product reviws, reveal, on some of this units, can be celebrated, because the calibration components, don't have the necessary range, to do so. Of course there are ways to wotk around that, but I though people should be aware of that before spending their money. Particularly if they don't have the knowledge or skill, to repair something delivered to the defective.
I was just looking at these, I needed more than 10amps, like 20aor so, for a battery charger/power supply project, I settled for a amp meter only, I will use a separate volt meter, the amp meter, is 100amp, with a shunt, 100a, 75mv , I wish it was all in one, the shunt is a bit large for the project, on the up side, I do have another use for it, if I decide to not use it, I am converting an old lead acid charger, to also have a power supply to charge lithium batteries, up to 24v 6s, or power any thing reasonable, also shut off when battery voltage reaches a programmable voltage, crazy idea, but I need it, and it is in need of repair!!
Great video, i have the exact volt amp meter :) Also, i am building an app with MIT to control relay boards (12 relays... 8 relay board plus 4 relay board, all 5v, all low level) with arduino, in a car (12v)! do you have any help you can give? any videos regards
Thanks. I have got some videos on relay modules. Here is one where you can control 8 channel relay th-cam.com/video/dkESWpdDBYk/w-d-xo.html and you can use your command instead of the keypad. Or 4 channel with push button th-cam.com/video/3EZecphNdAI/w-d-xo.html or 16 channel th-cam.com/video/Q9aBI4ELKC4/w-d-xo.html
At last a clear and very concise description of the wiring of this meter. Its a shame that the multiple sellers of these meters don't supply similair instructions. Perhaps they should all provide a link to your instructions?
Amazing content. I designed an enclosure that used this module before I ever had a chance to play around with it. When it arrived, I had no idea what I was doing, now I do, and I don't have to 3D print another enclosure!
Wow this really is the best overview of this little DC volt/ammeter. Above and beyond, man. You even measured the dimensions (there are tons of schematics out there but are vague on where they are measuring).
One thing you did not mention was how to zero current meter.
These meters do not read negative current.
I had one of these units which had a bad zero! i.e. It needed about 1 amp to before the meter started to read. If you had 2 Amp then meter read 1.00 Amp i.e. 1 amp zero error.
1. To fix this link the 2 pads just above the main chip where it says ADJ-Z (see 15:42).
2. Apply power to meter for 1 second.
3. Remove link and re-power meter
This zeros current meter and meter then measures current correctly.
BTW your zero was OK so you did not need to adjust zero.
Thank you.
thanks. my ampere meter is the same.
When you say 2 pads just above main chip near the I ADJ-Z are you able to explain a little more. I believe mine needs zeroing but don't know where to short across
@@justinryan3365 Hi Justin:
At 15:42 you can see 2 unsoldered pads. (3mm above main chip towards edge of PCB)
1. Unplug current lead to force zero amps
2. Short out these 2 pins then turn power ON.
3. Turn power OFF.
4. Remove short.
5. Re-power meter.
6. Meter Zero should be reset.
Peter
This is the best explanation of how to wire these I have found thanks it made it super clear keep up the good work
If you are 3D printing, I have found that the cutout needs to be 26.8 x 45.4 (thickness of 2.5mm worked well for me) - I also chamfered the inside cutout by 1mm or so. Hope that helps
Thank you for sharing.
I've watched a few different videos about these little meters and I have to say, yours is the best! Very clearly detailed and explained well. Liked.
Thank you .
@@robojax Very welcome sir. I have watched a few of your other videos in the past and they have been helpful.
I am glad you found it useful . Cheers/
There is many version of this madule.the best kind has three thick wire and 2 thin wire.but most has 2 thick wire and 3 thin.and some of them has 4 digit and more percise
9:42 I thought you were NOT supposed to connect the little black wire when the amp black wire is connected.
Yes you should connect it as shown. Thanks.
You only need the thin black wire if you use an independent supply to power the unit (eg a PP3 battery)
Excellent tutorial, it is so amazing to see you selflessly make these videos so that people can learn from it without any doubts. What amuses me more is that you take care of the minute details while explaining as if you are reading the viewers mind. Really wonderful. Thanks a ton for these tutorials. I am from India and I have become a fan of your tutorials.
That’s very kind of you. I am glad I could help.
@@robojax Agreed!! Your videos are very helpful!! I have both this 10A meter and the same one but with a pcb ontop with built in shunts for 20A. It did not come with termination instructions so I am lost how to connect it!...it seems to be a great little meter and rated for both 20A and 30A...either way...thank you for the videos!
Have you sen these? SDENSHI 2 in 1 LED Voltmeter Ammeter, Digital Multimeter Display Voltage Current Tester, DC 30V 20A/30A Voltage Amperage Meter Panel Gauge - Red-Red, 30V30A
Excellently explained. Can't have questions ...
I'm glad you found it helpful!
Great tutorial! if I change the shunt resistor to read up to 20A what value must the resistor be? Thanks
For 20A , get a shunt that gives you 50mV at 20A. Then whatever you , multiply it by 2. For 20A you will read 10 and for 20A you will read 5A.
Thanks for the Shunt calculation. Were you by any method able to determine what the digital ammeter impedance is. Is this a 100 mA or is it actually a micro A actual reading, I am looking for a meter with 1 mA range to replace an analog meter in a tube tester and need some more info to calculate if I need an additional series resister to match the analog meter resistance.
Thanks
You are welcome. this module won't work for you as the resolution is about 50mA so. I have review of a product th-cam.com/video/Mmxw7T29Z6k/w-d-xo.html that has different displays at milliampere. So get from the same manufacturer on AliExpress.
Hi, do you have a schematic for wiring a 50a 75mV shunt to volt/ammeter when using 4v to 30v power to supply meter but measuring load from another source?
Wonderful explanation,this is the best video I have ever seen. Fabulous 👍👍👍
Thank you so much 😀
@@robojax welcome
Nice and informative video thanks for the same to guide people interested in electronics,
When you use a common power below 30 volts DC to power the Voltamp meter the thin black wire should not be connected to the negative along with the thick black wire as it will burn and damage the meter at higher current , for using the meter for voltage higher than 28/30 volts a separate power for the meter using the thin red and thin black wires to be used
I have a couple of meters 3 digits & 4 digits on my variable bench power supply & also for my auto cutoff battery chargers, very nice meters from Amazon & Ali Express
It has an accuracy correction factor of 0.8 to 1% plus 2 digits for voltage, the amps usually is almost correct but can be adjusted with the “ I ADJ “ pot as explained in this nice video
All the best to you
Hi, what happens if you have the ammeter set up to measure the current going out of a 12V battery and then you charge the battery so the current flows in the opposite direction. Will the ammeter drop to 0 or will it show that the current is reversed ?
I have exactly the same question!!Mine had weird behavior with opposite current... It read something but I don't know if it's correct
It shows zero if you reverse the current, I use 2 back to back, one shows charging current, the other discharge current.
Thank you sir! The ammeter connection was confusing me because of the common negative for both the volt meter and ammeter parts. I didn't realize that you are only able to measure the amps on the negative size of the load when using a single power supply. Great explanation!
You are welcome. I am glad you found it helpful.
Please, which of the ammeter (thick) wires connect to the source and to the load? Thanks ...
Hi, I have made the video to answer such questions. by asking such question you made me watch my video. I have peroperly shown the wiring digram and explained every wire. please watch.
Dear Sir,
I'm writing to you from Belgium and my home language is not English, so plse be indulgent with my grammatical faults.
Many thanks for your interesting and well presented video about the installation of your digital 10 Amp meter and in combination with a voltmeter.
If you could spend some time to read me, it would be great.
I already have since 40 years an analogue -50/0/+50 Amp gauge from Smiths in use.
This was already used in different cars.
Now it is installed in a VW Golf MK2 GTI 16V of 1988.
It is a gauge functioning with a shunt build inside of it.
Now the gauge is becoming a little bit tired and it is not anymore as sensitive as before in order to indicate the uses of small amounts of amperages!
This gauge is indicating the consumption of the total amp's of the loads used and also if the alternator is strong enough to produce some extra current to the battery in order to compensate the used Amps by the loads, but also to load some extra amp's into the battery, if necessary.
I heard that even when the battery is fully loaded, there is still about 0,5 Amps of current loading the battery?
Of course the Amp meter is registering the total electricity consumption of the car, but the starting motor, which is consuming too much amp's, (and would destroy the amp meter), is excluded from the circuit.
Now come's finally my questions.
Please tell me if I'm wrong or not!?
Is it possible to use a digital Amp meter together with an analogue Amp meter?
Because, how ever I would like to keep my analogue Smiths Amp meter.
Is it possible to connect a digital AMP meter with a shunt in parallel to the two connecting points of my Smiths amp meter (one connecting point has two big wires coming together and the other one has only one big wire), or do I have to use separated (smaller) wires coming from the fuse box or battery or from the alternator?
I do not think personally that it will be possible to realize this, as when I want to measure the Amp's with my digital portable Amp meter, I first have to disconnect all the big wires from my Smiths Amp meter gauge, as otherwise I can't measure any amp's at all.
Also If I disconnect the big wires from the connecting points of my analogue Smiths Amp meter, the car will not start nor provide any electricity anymore, as the circuit is interrupted!
It must be in this case a serial connection, because parallel is only for the volts, isn't it?
But in all this I don't have any knowledge at all.
Can they possibly work together in harmony or not?
Do a digital Amp meter needs a shunt above 10 Amps?
But an analogue meter is still working with an internal shunt till 60 Amps, or maybe even above it?
My digital portable Amp meter can register amperage's till 20 Amps but only for a short time?
Nevertheless the shunt inside of the portable Amp meter seems to be as thick in diameter as the one installed inside of my Smiths gauge, with a bigger reading of 50 Amp instead of the 20 Amp?
And also what do you think about a digital Amp meter with a hall sensor?
Is this a better and easier solution?
Is it less accurate than a shunt, or can't he read the consumption of electricity and the load of the alternator together?
So dear Sir, I don't know if my logic is totally correct, but I would like to receive some additional help and expertise from you about the connection and possibilities with a separated shunt and his digital meter (with a more precised Amp's reading), and in combination of still using my old analog Smiths gauge?
Sorry for beeing so long, with my questions, explanations and comments.
Many thanks in advance for giving me (if possible), an answer!
Best regards,
Christian.
Hi Christian, Thank you for your comment and detailed explanation. Your English is perfectly clear.
1) Is it possible to use a digital Amp meter together with an analogue Amp meter?
Yes you can use it BUT in series. So both metes can read.
2) And also what do you think about a digital Amp meter with a hall sensor?
Hall is better because we don't needs shunt resistor and it is ALWAYS the best way here are my videos on current sensors th-cam.com/channels/kcBSig_Iu4ZnAIeCeG1TVg.htmlsearch?query=current
and here are my power meter videos th-cam.com/channels/kcBSig_Iu4ZnAIeCeG1TVg.htmlsearch?query=power+meter
Shut up
How can we set current limit while using this display. Short circuit on buck but it's not being displayed when red wire for load from display and positive from buck is shorted. It seems wrong my since these are technically our outputs, how can we display Current limit while adjusting for CC??
this module just shows the current. If your power module has CC, then you can short cercuit the output. So do it like this. I assume your power supply can't output more than 10A. 1-connect this meter at the output of your poower module 2- set the CC to minimum. 3-shoort circuit the output of the meter and keep it short cuircuitted 4-Adjust the current. and you will get the limit.
This is the best tutorial on TH-cam ever !
Thank you. I am glad you found it useful.
Like again
Your the best
man i love it. but mine not reading amps do you know how to fix it? thanks
There is a resistor close or connected to shunt. Check that and see if it is open.
Excellent tutorial. is there any way to troubleshoot it? I bought a new one and the screen does not work!
The analog ammeter has failed in my 6/12V 2 amp trickle 6 amp max charger. Do you suppose this would wire right in and work well?
Great Video!
Question, I am using a single power source for my meter but I want to be
able to turn off the meter while leaving the line power on. Do I
interrupt the yellow wire for a switch?
Thanks
As I shown inside this meter we have a think wire as shunt resistor so it does not matter if you connect the yellow wire or not. It will pass the power through.
si pudieras hacer un video de como regular lo que marca el display y a quien hacerle caso si a la fuente de alimentacion que marca un voltaje y corriente o hacerle caso a lo que muestra el display del medidor osea quien da las mediciones mas verdaderas?
sorry when I used Google to trasnlate this, it doesn't give me any meaning. So use very basic language to allow translating software to work better.
Hi, can It read negative current? I have a task to Control a single lipo battery powering a Power bank module, the forward current would be a phone being charged, and the reverse current would be the Power bank module charging The lipo.
Did I miss the part where the meter could mesaure any voltage below 3.3V (or, below dimmer point)?
Nice instructional video! I am wondering what is the load your are using in this video?
I have an electronic load where I can set to to acct to draw constant current, power or. resistance
Exactly what I was searching for thanks!
Glad I could help!
Dear i have question please help
i use to power it up with invertor battery
it may have some time 14.5 volt while one charging so will work or it may be burn?
Thank you for your time and video, help me a lot. I've got the voltage showing but my amps are lit up with 0.00
either current reading wire is not connected or internally it is damaged.
good job sir from philippines.your new subscriber..
Welcome aboard! Thanks.
You are a very good presenter.
I try
Hi,
I need to check the battery charging amp using a solar panel. Can I use this meter to check how much current the solar is pumping to charge a 12volt battery?
Thanks
Yes, you can
VERY NICE AND CLEAR VIDEO, I HAVE ONE QUESTION ¿WHAT WOULD HAPPEN IF 15 AMP PASSES THROUGH THE INSTRUMENT?
Thank you. I have not tested it. But I would advise against it. The higher the current, the higher the voltage appear across the shunt and I don't know if there is prevention mechanism there.
Hi . how to make the 10amps up to 15 amps reading? add more shunt
you can't.
thank you
does anybody know which is the model of the main IC?, does it have SPI or i2c?
Could a 100w 2ohm load resistor be use in this same circumstance? For testing purposes I mean? I'm currently designing a 24v 10amp project and only have a 100w 2ohm load resistor at my disposal!
I measured the shunt resistor value which I don't remember the value. but if you change it to different value, all the reading will be incorrect.
you may start with this project using Arduino th-cam.com/video/9jwCc7uPGoc/w-d-xo.html then we have tutorial showing you how to use it with LCD dispaly. If you are not familiar with Arduino, Here is $200 Arduino course for free Arduino Step by Step Course (over 100 video lectures) Starts here robojax.com/L/?id=338
Mr shamshiry what happens if we try to measure voltage with reverse polarity?does shows values or meter burns?
I have not tested it but I believe it will die.
how to adjust ammeter reading. describe tool and procedure more clearly. i see a small flat screwdriver but i am guessing how much to push, use the corner?, please thank you
I must have shorted the thin black wire (it got hot) and now the Amperes stay at 000 all the time. Do you have any idea how I could test or fix this ? Thank you.
The current is measured from shunt which is about 50mV which I have shown in video. if you miss up the wiring, it is possible that higher voltage gets into the circuit and might have killed the resistors that are protecting the module. Now it is very hard to repair it unless you have exact module, using multimeter check all resistors close to the shunt and compare it with the good one and if you are lucky you might find it. There is another possibility one of the chips reading the voltage is dead. good luck
Excellent video, i have a question please help me , i have a yellow cheap multimeter dt830d i want to check measure current between 6 to 8 amps continuously in series while charging the battery is that possible ? please help how to do it also if not possible let me know how much maximum current ampere i will check continuously on that multimeter for hours thank you in advance
Hello, you can use it continuously as there is a shunt resistor a string wire. So no worries.
@@robojax ok if i will continously connected without shunt on 1 amp 2mp or 3 amp is that ok, means how much max current i can check without shunt for long time period thanks friend
How can increase current measurement range this circuit?
no possible. buy another meter.
Anyway to get this to read negative voltages?
no.
@@robojax Well I tried it and it worked. I am not using an independent source to power the meter. I attached the thick black wire to the negative side of the source, the thick red to the negative side of load, the ground terminal (source) to the positive side of the load, and the combined thin red and yellow wires to the positive side of the load. Of course it does not display a negative sign but DOES display the magnitude of the negative voltage which is really all you need. Just label the AV meter as negative voltage.
This is a great instructive tutorial very well presented thank you
Super cool detailed explanation - I learned a lot! Muchas gracias!
Glad it was helpful!
very interesting, thanx, I use the same one for (only) measuring voltage in projects , but did not know about the adjustments!
You are welcome. yes and it becomes very accurate.
Excelente tutorial es muy instructivo,seria muy bueno que todos los demás yotuber en sus vídeos de reparación le pusieran la opción de subtitulos.Saludos desde la Isla.
I have this same meter and ampere reading wasn't correct... Now i can easily make it correct thank u
You are welcome
Thank you for an excellent tutoriel Greitings from Norway
you are welcome. Greetings from Canada. Stay safe.
I got a question plz tell me if these meter are protected against short circuit in the output or not?can i use it with battery source without relay protection?
this can handle 10A and about 12A for few seconds. Short circuit means ∞A and of course it can't handle it. this is should always be in series with the load.
@@robojax tnx so what do you advise for me to make and protect my battery pack with this meter ?ive tried relay but it doesnt cut off when im shorting leads
to protect battery use this module th-cam.com/video/0mOqpCfAdy4/w-d-xo.html I have explained it fully
Nice video. I have a question. What is wrong if I have it connected right(like iit is shown in original schematic), but it is not showing the current. It displays just 0,00A
If you know your load gets current and wiring is correct then it might have been overloaded and something has burned or died.
@@robojax it shows current just in one direction? I tried both directions and it didn't work but now it works in one direction. It shouldn't be because of the overload.
sir how can we use same digital voltmeter ammeter for measurement of 50 to 100 A of current using shunt
what changes we have to do in meter
You can’t change it. Use this th-cam.com/video/tgneN2hzRe0/w-d-xo.html or modules
Hi. Thanks a lot for making this detailed video. I watched a ton of other videos and none of them helped until I watched this one. One question that I hope you can answer, what would happen if I were to draw more than 10 amps? I have this connected to a 12v power bank which also has a 220w inverter attached to it. Will it survive a 220w load or will it blow?
Hi, you are welcome. I have not tested it but higher current perhaps there will be 1A or more tolerance but for 5 or 10 seconds. This is what I have tested but longer than that I am not sure and not advised.
@@robojax thank you!
There are many versions, and can have problems because of badly written firmware.
The display refresh can be much slower than advertised such as 800mS instead of 300ms.
The voltage and/or current can have bad tracking accuracy despite being zeroed and the gain trimmers adjusted.
The ones that have poor current tracking will also jump over the "0.01"amp reading.
The meters I got from Banggood have good current accuracy but poor voltage tracking.
If I calibrate at 5V, they will display "31.1" when I apply 30V.
And I am powering the meters from constant 5V to the thin red wire.
I agree with your statement. These are cheap and what can't expect much from it.
Anything that is sold should meet advertised specifications regardless of price. The problems are unnecessary and easy for the manufacturer to correct. Most annoyingly, they used to be good.
I can fix the voltage problem by putting a 4.7M resistor from 3.3V to the voltage ADC input pin on the micro but the slow refresh makes them useless to me. Example,
drive.google.com/open?id=18-L6NMsQPRj__3B3tpa6mP_4cYvvMNtz
It was a very useful video, I have a question about my problem, I would appreciate it if you could answer it. If possible I need the model number of the diode next to the 7133-1.
I don’t have this on hand now. Do google image search I am sure you will find high ready image. Besides I am sure it should be a regular or a schottky diode
@@robojax Thank you for your answer. When I look through the microscope, I only see B3 written on it.
Best tutorial sir!
Hi I've got a quastion. Is it possible to use this volt and ampere meter to check voltage and current from 3 different power sources? I'm thinking of using some kind of switch with 3 inputs and 1 output. Please help me
Hi, making such thing is possible but not easily possible with this display. this is your best option th-cam.com/video/3C33DpcSwIw/w-d-xo.html with TMS1637 th-cam.com/video/DuamjlstOKM/w-d-xo.html
Thanks for the video. Mine was a little different with a two lead small red and black, and three thick black,red and yellow. It powered on with the small red and black attached to 12v. I put the big yellow onto the 12v and got a magic puff of smoke. This surprised me as I though if yellow was the voltmeter line it would read 12v else if part of teh ammeter circuit it would not read. I would appreciate anyone telling me how mine worked, what caused the problem, and potentially how I could fix it.
I have one that doesn't has a shunt resistor, and it doesn't measure current, how can I fix it? I have no shunt resistor around me so what can I do?
it would be very hard to fix this then. buy another one and don't waste your time on this.
@@robojax thanks
How to measure current of dc motor from this meter. Motor operates in both direction.
Can’t. Only one is possible for this
Thank you very much. I though the device could be used as panel meter so I supplied 15Volts to it last night and it vent off, burnt. Mine is PZEM-050 with a specification: DC 5.6 - 100v the current is : 0-100A it came from kikuu with 100A shunt resistor. Please is it good for panel meter??? to measure both voltage and current as well as wattage ?? you are now my teacher so i want to know. Have a nice weekend.
You are welcome. Yes this is exactly made for panels. Please subscribe. It is appreciated.
Great video I was confused now I'm going to have another go. My question what happens if the power supply is reversed will it show a negative or will it fail?
it will burn.
How to calibrate to accurate reading in amps. How to adjust at the back
You can't change it. There is nothing to adjust. Here is another current meter: ;th-cam.com/video/2FzceyhG37M/w-d-xo.html
You can zero the current range by jumping the "I-ADJ-Z" holes while powering up. Use the "I-ADJ" trimmer to correct the span. It may not be possible to get it perfect depending on what version you get sent.
@@xavieraxiak6866 how to use the I_ADJ trimmer bro.
Hi please help. I bought the 100A version and it has no shunt. I want to make one. What specs do I use?
I am a bit confused.
Hi, just search my channel for "shunt" and you will get a lot of videos. here is the search result th-cam.com/users/robojaxTVsearch?query=shunt
@@robojax Hi thanks.
I have one of these. I just need to work out the amount of copper plate to use.
www.ebay.co.uk/itm/DC-100V-100A-Voltmeter-Ammeter-Blue-Red-LED-Dual-Digital-Volt-Amp-Meter-Gauge/283621092127?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
I'm not sure which one to watch.
@@robojax What resistance and voltage drop do I need across it?
this module doesn't work with external shunt. I provided all shunt related videos you may watch them.
@@robojax There is no internal shunt. The picture in the advert is incorrect.
Excelente tutorial. Gostaria de saber se este produto mede tensão invertida assim como o multímetro e indica a inversão com algum símbolo no multímetro quando se mede uma tensão negativa ou se equivoca na ligação da polaridade o multímetro indica com um sinal negativo, no meu projeto gostaria de usar um desses em linha com um pack de bateria o que indicaria o quanto de tensão e corrente está saindo e em carga o quanto esta entrando negativamente...Grato...e viva o compartilhamento...
Oi, se você conectar a polaridade ao contrário, vai queimar. embora eu não tenha testado.
Imaginei, tinha essa dúvida pois ele tem uma linha de alimentação separada da linha de medição... posso por uma ponte de doidos polarizando corretamente a entrada e ajustando o medidor compensando a perda de tensão na fonte o problema tende a ser o amperímetro que usa um shunt... muito obrigado... terei que fazer testes, ou procurar um que aceite inversão... grato pelos seus esforços...e viva o compartilhamento...
How do I wire it just as a volt meter without a load no mesure of amp
I have shown full wiring . I mentioned what each wire does.
I have very similar (same) volt/amp meter units, but they are way off when measuring current. I set the ammeter trimmer at 1.00A but when the measured current goes higher, the ammeter shows much higher. For example, at 2A it will show about 2.50A, at 5A it will show about 6.5A, and so on. Same but opposite if I go below 1A: at 0.5A it shows maybe 0.3A. It is very non-linear. I was surprised to see that yours is accurate/linear over a range of currents. Do you know what could be the problem?
Hello Edin, I am not sure what is the difference bewtween yours and mine. this has no brand name. And that is the problem with most chinese modules. If they had a brand you could track it and find the issue. Now everyone produces them and have no standard or design rule.
Hi, This type of meter uses a shunt to measure the current in the ground wire. The thin black wire is also ground. You must NOT connect the thin black wire unless you are powering it from a separate isolated supply such as a battery. The video is misleading. Simply disconnect the thin black wire and it should read correctly.
@@steve6375 Thank you, Steve!
The thin black wire IS disconnected, so that doesn't help. I actually tried this unit with a separate power source and it is then accurate. So, the designer/maker of my particular module didn't solve the problem of shared supply and measuring lines, and I will have to find a way around it, either by using an isolated DC-DC supply, or somehow taking differential measurements.
@@edinfific2576 Edin Fifić yes, my measurements have this problem too.
when the power supply and measurement are the same, the ampermeter is show higher.
I had to put 2 cellphones batteries to power the measurement. and now this accurate. and I'm not worried about drain the batteries. Its measurement works at very low power, and batteries are not necessary for a month's charge.
@@edinfific2576 If the thin black wire is disconnected then it should measure current accurately unless you have also connected a different gnd\0V to the same circuit. e.g. If you have a +5V and a +12V output with a meter on each output and you connect it to the same circuit it will not read correctly. These types of meter measure current in the 0V line and so you can only have one meter in the 0V line.
NB - On the ones I use the two black wires are connected together on the PCB.
TIP - removing the PCB makes it easier to fit the unit in a panel.
If you reverse the current the unit reads zero amps, I have two of these connected back to back in a PV solar setup, one reads current into the battery, the other current out.
Very useful thank you
Glad it was helpful!
Your explanatio??is good. One doubt. If the operating voltage is not steady, will it not affect the functioning of the meter ?
How about providing a steady voltage with the help of any 78 series (7805, 06 or 09) ?
Sorry. read as explanation
it just displays. This is NOT energy meter. if voltage is not steady it SHOULD display it as it is.
Do you know
What is 6228A
1948/33
How can I fix it
What are these numbers? Are they the metre or transistor
@@robojax written on he item
Great vedio
sir , will 100v,100A DC volt/ammeter of same type will give accurate readings.will calibration in 100A,100V meters will give accurate readings
it can't be of the same type when it comes to 100A. for 100A you will need an external shunt resistor. See meeters th-cam.com/users/robojaxTVsearch?query=meter
mine always shows only half the ampere. any idea where the error could be?
you might have changed the shunt resistor to half size and it produces half the voltage which the current value. if you have not changed it, then, some resistor on the path from shunt has been damaged and now it dropping the voltage to half. So check a few resistor be comparing them to the written value. it would be hard to measure which they are in circuit. for proper reading they should be remove and measured. I am not sure if this is what you would do.
Epic video as always. Thank you
You are welcome.
Great video. Can this really measure 10A? I heard this blows when passing more than 5Amps.
I belie I tested and presented it to you. It is very strong shunt. even it can handle 2 or 3 more ampere for few seconds or minutes.
Robojax is this suitable for a car charger drawing nearly 10Amps for hours? Using of shunt is mandatory for less than 10 amps?
My current measurement is wrong .it is 2-3 amps higher and it also varies (sometimes 2 amp higher ,sometimes 2.5amp higher when voltage changed etc).I checked with multimeter.i also tried adjusting trim pot but amp is too inaccurate to correct with pot .how can I fix it
it must be damaged. 2-3A is very large.
@@robojax is the micro controller damaged or lm358 or anything else?
not sure. not worth repairing. the opamp will cost almost the the same as the meter if you pay for the shipping.
Thank you for the video very interesting I have this meter but would like to use it to measure a lower amperage I would like to measure 0-5ma is there an easy way to convert the meter please Thanks if you can help Bob in the Uk
You are welcome Bob. No it is not possible because this device has been set with fixed value of shunt resistor. in order for you to measure lower current, then you will need much smaller resistor. You would have to use other types of devices such as current sensor using Arduino and I have a videos on that topic th-cam.com/users/robojaxTVsearch?query=current_sensor Ahmad from Canada
@@robojax Thank you for your reply I will have a look at your other video
Love the channel its nice to get a reply Bob
You are welcome. I try to read comments and reply.
Nice. Thanks for the interesting video. Please continue!
You are welcome. Will try to do that.
Can I use 5w 5ohm resistors
what for at which part? I have posted 300 videos and don't know exactly what you are talking bout. please type the time like 5:31 or something so I can click and see. I will replay if I understand the question. Thanks. Ahamad from Canada
@@robojax 6:45 I have 2 resistors of 5w 5ohms can I connect them in parallel and then use as a load to measure the ampere
What is the minimum current that this display can read?
I just watched the video. You can see that it show only 2 decimal place. so smallest value for the current is 10mA. I have added a page for this with links and resources in the description.
@@robojax Thank you for the help!!
I dont know why, but the same type meter that I bought can mesure up to 10+ amperes, may be max to 20A. I use it to mesure my solar panel, and it show the curent is 16a.
Very good explanation keep it up ^ ^
U helped me a lot thx ; )
Glad to hear that!
This type of meter uses a shunt to measure the current in the ground wire. The thin black wire is also ground. You must NOT connect the thin black wire unless you are powering it from a separate isolated supply such as a separate battery. The video is misleading. If you connect the thin black wire it will affect the current reading. Simply disconnect the thin black wire and the Amps reading will be correct.
which part is misleading? it perfectly works and correctly shows . Perhaps you don't understand how current is measured. Watch the video again and do not escape.
yes. my meter has this problem too. when thin black wire is connected the ampers are double. but when disconnected ampers are correct but voltage shows lower😫
@@robojax It works for you because you are using a *battery* which provides an isolated power source. But in the real world, people don't connect isolated power sources to the meter, they use the same power source to power the meter. In this case, you must NOT connect the thin black wire. rmprepusb.blogspot.com/2019/11/everyone-is-wiring-up-their-power.html
@@robojax Yes, @steve6375 is correct. If you don't have two isolated power sources, you must disconnect the thin black wire. This is documented in product reviews as well as Q&A. I did not get double readings as some have stated. I got about half of actual and I broke the trim pot trying to adjust, which is impossible. Your video is excellent, but you only did one of the wiring scenarios.
bueno no entendi que quisiste hacer ya que esta editado el video se notaba al medir el shunt y porque midio 48.7 y en el display solo 3.3 no entendí la exposicion del tema.
Hi, because may be you did not turn ON the subtitle in your language. that 48.7 is 48.7mV. There is a relationship between the shunt voltager and the current.
Thank you 😊 best tutorial
I need to measure approx 30 Amp
Is it possible to measure by this
1. Can use as another shunt resistance externally to measure ampere not exactly same ampere but at least a scale value of current so that we understand current.
In normal multimeter we did like this to measure current, we measure current in externally thik wire by just putting our meter prod any 2 points at gap of 1 meter and it shows ampere in miliamps we just understand calibration that how much miliamps shows during actually known 1 ampere nd then we do multiplication nd here we get actual ampere, so like this is it possible in this meter
Hi, the it is very clear from the title "10A" is the limit. you can use this meter th-cam.com/video/Mmxw7T29Z6k/w-d-xo.html or all other meters that I have done the reviews here th-cam.com/users/robojaxTVsearch?query=meter
Very good video, Thank you very much
Thank you too
Hello I connected it with 50v and it is no more working what could be burned can i fix it
i believe the main chip should be dead and it is done. get another one.
Best tutorial 💞
Glad you think so!
Hi, can u do a video on arduino flowmeter, which has a LCD display. It is also link to a bluetooth, which can be view on mobile phone. I very interested to learn from you how to do it. Thanks
Hi, this is quite a project. first flow-meter, then LCD, then Bluetooth and viewing on phone. so it is 3 project in one. I don't have the flow-meter either. so won't be able to make it. :-(
Thanks for this, I had one die, a 4 bit version (4 digits) I wonder what happened i had a lithium cell + tp4056 charge/discharge module on it. I never had issues with this setup then recently it wouldnt power on, after some investigating (i had it wrapped in heat shrink) I noticed the tp4506 module getting supper hot, it was going to blow! i scambled for a set of plier to cut the battery and managed to do it before it blew up in my face... after taking off the heatshrink i noticed the output of the battery on the t4056 module had lots of extra wire comming off it, which got squished up against an IC creating some kind of short I believe. Then i remember i remounted the display with hot glue and that could of brought that wire into contact, clip your wires after you you solder them on i suppose, there is a chance they can find a way and touch something they shouldnt.
When powering from the same source, you DO NOT need to connect the thin black wire.
Try disconnecting it.
it will make people confused. For example if they need to measure voltage only, then they will have issue.
@@robojax Maybe...but if they only want to measure voltage, they wouldn't be buying a volt/ammeter, would they? Also, if you do some research on these units you find single-supply circuits that have the thin black wire disconnected - that confuses people who have seen your connection!
BTW There is an internal connection between the negatives.
In product reviws, reveal, on some of this units, can be celebrated, because the calibration components, don't have the necessary range, to do so. Of course there are ways to wotk around that, but I though people should be aware of that before spending their money. Particularly if they don't have the knowledge or skill, to repair something delivered to the defective.
thank you for sharing.
Thanks for educating.
I was just looking at these, I needed more than 10amps, like 20aor so, for a battery charger/power supply project, I settled for a amp meter only, I will use a separate volt meter, the amp meter, is 100amp, with a shunt, 100a, 75mv , I wish it was all in one, the shunt is a bit large for the project, on the up side, I do have another use for it, if I decide to not use it, I am converting an old lead acid charger, to also have a power supply to charge lithium batteries, up to 24v 6s, or power any thing reasonable, also shut off when battery voltage reaches a programmable voltage, crazy idea, but I need it, and it is in need of repair!!
Great video, i have the exact volt amp meter :)
Also, i am building an app with MIT to control relay boards (12 relays... 8 relay board plus 4 relay board, all 5v, all low level) with arduino, in a car (12v)! do you have any help you can give? any videos regards
Thanks. I have got some videos on relay modules. Here is one where you can control 8 channel relay th-cam.com/video/dkESWpdDBYk/w-d-xo.html and you can use your command instead of the keypad. Or 4 channel with push button th-cam.com/video/3EZecphNdAI/w-d-xo.html or 16 channel th-cam.com/video/Q9aBI4ELKC4/w-d-xo.html
There is no shunt resistor instead there is r18 resistor I have the same voltmeter can I add shunt resistor
when you have a resisterr in series with power, it is called shunt resistor.