Einleitung

Jeder Heimwerker sollte mit einem Vielfachmessgerät auskennen, mit dem man ungefähr tausend verschiedene Sachen messen kann. Lerne hier die drei Basisfunktionen eines Vielfachmessgerätes.

Teil 1: Überprüfe den Stromfluss

Teil 2: Überprüfe die Spannung

Part 3: Überprüfe den Widerstand

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    • Anhand einer Stromüberprüfung wird festgestellt, ob zwei Dinge elektrisch miteinander verbunden sind, d.h. ob ein elektrischer Strom ungehindert fließen kann.

    • Wenn kein Stromfluss vorhanden ist, bedeutet das, dass der Kreislauf irgendwo unterbrochen ist. Dies kann auf eine durchgebrannte Sicherung oder eine schlechte Lötverbindung hinweisen.

    • Die Überprüfung des Stroms ist eine der hilfreichsten Tests für elektronische Reparaturen.

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    • Stelle sicher, dass kein elektrischer Strom durch den Stromkreis oder die Komponenten, die du testen willst, fließt.

    • Stecke die schwarze Messleitung in den COM Port an deinem Multimeter.

    • Stecke die rote Messleitung in den VΩmA Port ein.

    Why only in VΩmA not in 10A

    Geetha -

    Great question! The VΩmA port is rated up to 200 milliamps (mA), which is the correct range for this demonstration. If you're not sure how much current you're dealing with, go ahead and start with the red probe in the 10 A port instead—it's less sensitive, but can take up to 10 A without blowing a fuse.

    Jeff Suovanen -

    Why do we need to make sure that no current is running through the circuit?

    When there is another parallel branch with 24VDC power and 4-20mA output, the value of the resistance measured comes as zero. Whats the reason?

    Fraz -

    The way that a meter measures resistance is by sending a small current across the probes and then measuring the resulting voltage. So, another current will disturb your digital multimeter's (DMM) reading.

    nicO Gurney -

  3. RfDoM1gPDKP1raaV
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    • Schalte dein Multimeter ein und stelle den Drehschalter auf die Einstellung für den Stromdurchgang (zu erkennen an einem Zeichen, das wie eine Schallwelle aussieht).

    • Nicht alle Multimeter haben diesen Modus. Wenn er bei deinem fehlt, ist das auch okay! Gehe in diesem Fall einfach zu Schritt 6, um den Stromdurchgang zu messen.

    I want to search the resistance of gold and see if I have some

    Joel Stegner -

    What does a sound wave look like?

    Greg Janssen -

    Gold is highly conductive near zero resistance which is why they use it in conducters. Use "specific gravity" type tests or "mass spectromatry" type tests for elements.

    Sound looks like sine waves with various amplitudes and cycles per unit of time.

    MidnightWolf -

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    • Das Multimeter testet den Stromdurchgang, indem es kleine Strommengen durch eine Messleitung schickt und überprüft, ob die andere Messleitung sie empfängt.

    • Wenn die Messleitungen miteinander verbunden sind - entweder durch einen geschlossenen Kreislauf, oder durch direkte Berührung - fließt der Teststtom hindurch. Das Display zeigt den Wert 0 (oder einen Wert nahe 0) an und das Multimeter piepst. Der Strom fließt!

    • Wenn kein Teststrom erkannt wird, heißt das, dass kein Strom fließt. Das Display zeigt 1 or OL (open loop) an.

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    • Um deinen Stromdurchgangstest durchzuführen lege die Messleitungen an den Enden der Schaltung oder der Komponente an, die du testen möchtest.

    • Gleiches Phänomen wie vorher, wenn ein Strom fließt, wird 0 anzeigt und ein Piepsen ertönt.

    • Wenn 1 oder OL (open loop) gezeigt wird, ist kein Stromdurchgang vorhanden – das heißt, der Stromfluss von einer Messleitung zur anderen ist unterbrochen.

    • Normalerweise ist die Richtung des Stroms egal, d.h. es ist egal, wie man die Messleitungen anschließt. Es gibt eine Ausnahme: eine Diode ist ein Ventil für den Strom, also ist ein Strom nur in eine Richtung zu erkennen.

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    • Wenn dein Vielfachmessgerät keinen speziellen Modus für den Stromdurchlauftest hat, kannst du trotzden einen Durchlauftest durchführen.

    • Stelle dafür den Drehschalter auf die kleinste Einstellung im Widerstandsmodus.

    • Widerstand wird in Ohm gemessen und durch das Symbol Ω ausgedrückt.

    How do I test Amps ( ouput from a battery charger)

    jpretorius10 -

    Thank u so much

    Kademe Eric -

  7. K4RaLeyw6cJRZPUj
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    • In dieser Einstellung sendet das Multimeter kleine Strommengen durch eine Messleitung und misst, ob und was durch die andere Messleitung empfangen wird.

    • Wenn die Messleitungen verbunden sind - entweder durch einen Stromdurchlauf oder durch direkte Berührung, fließt der Teststrom hindurch. Das Display zeigt einen Wert von 0 (oder nahe 0, in diesem Fall 0,8). Ein sehr geringer Widerstand sagt aus, dass ein Stromdurchlauf stattfindet.

    • Wenn kein Strom festgestellt wird, heißt es, dass kein Durchlauf stattfindet. Das Display zeigt 1 an.

    You mentioned that if your meter screen displays 1 or OL

    But what happen if it shows other numbers

    Like 5.5 or somewhat?

    ddplc -

    It means you have current flowing which would indicate a good path or circuit. Also means you have a power supply connected which I think was mentioned earlier in the article to disconnect all power supplied, as in a.c., d.c. Especially in a vehicle as running tests on computer module circuits with the vehicle battery connected can damage a computer module circuit..

    Henry DeVito -

    I'm very pleased to have discovered these directions. Interestingly, I tried the two probes on different sections of a screwdriver – resistance showed very high. Is that possibly because of chrome coating on the screwdriver?

    James O'Neil -

    May not be a chrome coating at all even if it looks like it. The screw drivers "resistence" is the result of what alloys are used in the shank of the screw driver ... ie ... tin, zinc, carbon, etc.

    MidnightWolf -

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    • Um die Durchgangsprüfung zu vervollständigen, platziere je eine der Messleitungen an jedem Ende der Schaltung oder der Komponente, die du testen möchtest.

    • Es ist unerheblich, welche Messleitung wo anliegt.

    • Gleiches Phänomen wie vorher, wenn ein Strom fließt, wird 0 anzeigt.

    • Wenn 1 angezeigt wird, ist kein Stromdurchgang vorhanden - das heißt, es gibt keinen Weg für elektrischen Strom von einer Messleitung zur anderen.

    What does it mean when I first get 1 then the meter jumps to all kinds of numbers and there is no beeping?

    Choymae Huie -

    Most likely you have bad contact with whatever you are measuring.

    MidnightWolf -

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    • Schließe die schwarze Messleitung am COM Port des Multimeters an.

    • Schließe die rote Messleitung am VΩmA Port an.

  10. HNqkSTNZXWQMYQyU
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    • Schalte dein Vielfachmessgerät ein und stelle den Drehschalte auf den DC Spannungsmodus (erkennbar durch ein V mit einem gerade Strich oder dem Symbol⎓).

    • Alle Unterhaltungselektronikgeräte werden mit Gleichspannung betrieben. Wechselspannung, die durch die Leitungen bei dir zuhause läuft, ist beträchtlich gefährlicher und nicht Thema dieser Anleitung.

    • Die meisten Vielfachmessgeräte stellen sich nicht automatisch auf eine Spannung ein, was heißt, dass du einen ungefähren Bereich für die Spannung einstellen musst, die du erwartest.

    • Jede Einstellung auf der Skala zeigt die Maximalspannung an, die gemessen werden kann. Wenn du zum Beispiel erwartest mehr als 2 Volt, aber weniger als 20 zu messen, verwende die 20 Volt-Einstellung.

    • Wenn du dir nicht sicher bist, starte mit der höchsten Einstellung.

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    • Platziere die rote Messleitung am Pluspol, die schwarze Messleitung am Minuspol.

    • Wenn der eingestellte Bereich zu hoch eingestellt war, kriegst du möglicherweise keine sehr genauen Angaben. Hier zeigt das Gerät 9 Volt an. Das ist bereits aussagekräftig, aber wir können noch einen kleineren Bereich einstellen, um eine noch genauere Zahl zu bekommen.

    • Wenn du den Bereich zu klein einstellst, zeigt das Multimeter einfach 1 oder OL an, was bedeutet, dass der Wert außerhalb des Bereiches liegt. Das schadet dem Multimeter nicht - in dem Fall wird einfach ein größerer Bereich eingestellt.

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    • Mit einem korrekt eingestellten Bereich, erhalten wir einen Wert von 9,42 Volt.

    • Vertauschte Messleitungen richten keinen Schaden an - in dem Fall erhälst du einen negativen Wert.

  13. 3F3GHCbaSTBIFulk
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    • Stelle zu Beginn sicher, dass kein Strom durch den Kreislauf oder die Komponente fließt, die du überprüfen möchtest. Schalte etwa Geräte aus, stecke es aus und entferne sämtliche Akkus.

    • Denk daran, dass du Widerstand des gesamten Stromkreislaufs testest. Wenn du eine einzelne Komponente, wie etwa einen Widerstand, überprüfen möchtest, teste es einzeln - nicht angelötet.

    • Schließe die schwarze Messleitung am COM Port des Multimeters an.

    • Schließe die rote Messleitung am VΩmA Port an.

    Be careful when testing ohms on the circuit board, the best test is to remove the part so you are only testing the part not the circuit around the part. Transistors, resistors, caps need to be removed or at best one leg of the part. One time I had a burn open resistor, then I tested the resistor with my Ohms test I got some resistor reading. This was caused by back feed in the circuit.

    John E Reese -

  14. UpqSFJBmlROKRjL2
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    • Schalte das Multimeter an und stelle den Drehschalter auf den Widerstandsmodus.

    • Widerstand wird in Ohm gemessen und durch das Symbol Ω ausgedrückt.

    • Die meisten Vielfachmessgeräte stellen sich nicht automatisch auf eine Spannung ein, was heißt, dass du einen ungefähren Bereich für die Spannung einstellen musst, die du erwartest.

    Attention, une petite erreur dans la description ci-dessus : il faut remplacer “plage correcte de voltage” par plage correcte de résistance

    Jean Bertrand -

  15. pG6HGBHLnTHnf2rZ
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    • Platziere eine Messleitung auf jeder Seite der Komponente, die du überprüfen möchtest.

    • Es ist unerheblich, welche Messleitung wo anliegt.

    • Wenn dein Multimeter einen Wert nahe Null anzeigt, ist der Bereich zu groß für eine gute Messung eingestellt. Stelle den Drehschalter auf eine kleinere Einstellung ein.

    • Wenn du den Bereich zu klein einstellst, zeigt das Multimeter einfach 1 oder OL an, was bedeutet, dass der Wert außerhalb des Bereiches liegt. Das schadet dem Multimeter nicht - in dem Fall wird einfach ein größerer Bereich eingestellt.

    • Eine andere Möglichkeit ist, dass der Stromkreis oder die Komponente keinen Stromdurchgang erfährt - d.h. der Widerstand ist unendlich. Wenn ein nicht durchgehender Stromkreis vorliegt, wird das Ergebnis eines Widerstandstests immer 1 oder OL sein.

    Ici aussi petite erreur : remplacer “le multimètre indique 9 volts.” par le multimètre indique .001 Ω

    Jean Bertrand -

  16. OQ26IKiknfUSXjSf
    • Mit einem ideal eingestellten Bereich, erhalten wir einen Wert von 1,04 Ohm.

    Easy to understand for a none electrician. Good.

    ctsatph -

    Good tutorial ! Why was measuring AC and diodes not included ?

    Andrew Azariah -

    Very good why can't the manufacturer write these instructions thank you

    Brian ottewill -

    Yes it would be sweet if manufactures instructions were this clear. Excellent job

    freeportcowboy -

    All of this is great but what are people going to do with this information? Nothing tells them how to check components for shorts, probably the most common test when looking for failures in electronics.

    If this information were coupled with material explaining how to trouble shoot electronic circuits for basic information everyone would have gained a use for their meters. If information went a bit more in depth they would learn to identify failed components. Most of the time anyone can troubleshoot and repair a HDTV set using a multi-meter alone.

    Add to your already good work and help people get through the maze of what to do when troubleshooting electronics. Nothing about troubleshooting most electronics is hard to learn. It normally takes a minimal understanding of components to enable anyone to fix something.

    monthow -

    The name of the tutorial was “How to Use a Multimeter", so it was mesnst to be an introductory glimpse into how to use a Multimeter. Specific testing of electronics, PCBs, and the like is outside of the scope of this article. However, given the basic understanding of how a mtimetsr works it would be reasonable to expect someone to be able to figure out how to test the circuit board.

    Sometimes it's better to send two separate than overly complicated one.

    mbrulla -

    He’s not teaching an electrical engineering course here, simply telling us how to use a multimeter. For me, this instruction told me exactly what i needed to know. Whoever wrote it, great job. For those of you complaining that it doesn’t go far enough, well, in the immortal words of David Letterman, “why don’t YOU try a little harder?”

    Brad mellor -

    Very easy to understand tha

    Jerry Allen -

    Thank you thank you for doing this!! This is all new to me and your posting was sooooo helpful , easy to follow and you went step by step . Your the only place that said some multimeters may not be marked for continuity!!! I was losing it

    thanks again for explaining in layman terms .

    msgra2ity1 -

    Thank you verymuch indeed.habib Abolfathi.

    habibabolfathi -

    and what if the meter has NO symbol (selection) that looks like a sound wave at all ? You didn’t explain that some meters do NOT have that selection … so how would one do the test in another way ordinary in even cheap meters?

    ourearthlyangels -

    I was thinking that using a Multimeter is very complicated. I was wrong! Now I understand how to use it, thank you so much!

    Christ Jade Espino -

Jeff Suovanen

Mitglied seit: 06/08/13

407156 Reputation

130 Kommentare

EASy and helpful indeed

Trever Mazibuko -

Thank you! Never find instructions so easy to follow.

kuruvar -

Iwant to know hw to test caperstas

kapambwe sikazwe -

Great stuff!! Thank you.

warwick -

Super guide, many thanks for posting!

Alan -

Thank you. Very easy and good training

Badar Omar -

Very helpful for beginners, thanks for these clear instructions!

AndyBlaser -

great article. thanks

James Magenga -

thank you !!! for this info!!!

Sufian Hamouda -

i did not know i can do this.

jeez -

Thanks a lot this is very clear and helpful!

dillinger0893 -

Thanks Jeff. I just purchased a cheap mm. All instructions were in Chinese. Your help made sense of it all, so easy.

David Bennet -

Iwant to knw hw to test power suply

kapambwe sikazwe -

great, thank you for good description.

hzaim2001 -

Brilliant thank you

Liam Breen -

It takes an intelligent person to write simple instructions. BRAVO !

dave -

It truly does.

Shane Blanchett -

so nice Bro...Thanks a lot...

akramul haque apollo -

Love the resources on the Pro site.

Shane Blanchett -

Very good instructions

Md Kamruzzaman -

Nice guide.pl add some additional examples to have better understanding for beginners.Thank you

sugashankar -

Nice guide. Pl add some additional practical examples. Thank you.

sugashankar -

I'm doing exactly this and mine won't read any voltages, but it will read resistance. I've tested it with multiple batteries that I know work, but I only get a read of 0. What might be the problem?

Juan Partida -

Very good lesson, helped a lot. Thankyou

mark cole -

This is the best and easiest lesson on using multimeter. Thanks a lot!

Seong Lee -

Thank you, Haven't used one of these is ages; this was a great refresher!

GON Compactor -

thanks for a very easy tutorial, it is very helpful!

bonjie montaflor -

The basics. Soooo important. Well done, short and concise.

chris teter -

Nice and straightforward guide - thanks buddy.

Mel Gavin -

Most helpful thank you!

jodianderson34 -

Had multimeter for a couple years, never knew how to make it beep!

Mike Weatherl -

Thank you for these great instructions. The instructions that came with the multimeter were not helpful for a beginner, and these really helped us diagnose our problem.

Roger Lemaster -

Thank you for the great instructions. My question and the reason for my looking online for info on using a multimeter was to find out what the various resistance readings mean on a digital tester. I am checking out a defrosting element in my refrigerator and got a reading of 12 or 15 ohms. The information I was reading said a 15-100 ohms meant the element was OK, another book said if medium resistance was found it was OK.

By going online I was looking for the answer as to what is low, medium and/or high resistance ranges are.

I did enjoy your instructions, they were easy to understand.

JM -

I have used a meter for a long time. Never had instructions so clear and easy to follow. Thank you very much.

The pictures are also very clear and helpful.

Rick Lewis -

Beautifully put. I truly appreciate the lesson. I've learned something of impirtance. Thank you.

rickeybenn -

it really useful for begginer

erwin torres -

Thanks you for the lesson :)

Mark Diamond -

Hi,

das ist wirklich sehr anschaulich aufgebaut und benutzerfreundlich, vielen Dank dafür!

Wer jetzt noch genau wissen möchte wie Multimeter funktionieren und worauf Sie beim Kauf achten sollte der kann gerne noch auf https://multimeter-tester.de schauen und weiter lesen.

Ich wünsche euch noch einen schönen Abend und einen bestmöglichen Start ins neue Jahr.

LG

multimeter_tester -

Thanks you for the lesson :)

mrmannan05 -

A great introduction for a beginner like me.

Joe -

Hello . and thank you good read.

conrad -

Easy to understand...thank you

chip -

Thanks and had help me a lot

sinoncesar -

Had help me a lot. Many Thanks

sinoncesar -

Thanks, I think I've got it.

rama jama -

Simple and precise. A life saver as I couldn't find the "manual" - one page sheet. Greatful!

rudy2828 -

Wow I love this I can now read a resistor thanks keep on the good work

Adeyefa -

Great stuff this was helpful.

joel7269 -

Thanks , sometimes need too refresh with the basics.

Kurt Webster -

It is very nice demostration

Lokesha -

Sir can i get a book about basics of auto electrical and electronics or soft copy.

Lokesha -

Very informative! Easy to understand.

David Flatt -

Well written.

Neville Amaral -

Simple and easy thanks

kudakwashekatena -

I have been searching a tutorial on getting started with trouble shooting an automotive parasitic draw. I have no background in different types of functions of a mmeter such as continuity, voltage, and resistance, your tutorial was a must have. It gave me an understanding of just the basic terminology of the more advanced tutorials. I give it a major thumbs up, excellent tutorial thanks a million !!!!!!

camotrucker87 -

Easy to follow description. However, I am having trouble diagnosing a microwave diode. Seems I can't do that directly with a multimeter. Is that correct?

Rose - May 9, 2017

rakile -

Thank you, the instructions that came with my multi meter were clear as mud. Your mini course was very clear and concise.

t_wellman -

Thank you. This was very helpful to me. Very clear and easy to understand....

John Cascella -

Thank you so much, it is so easy to understand the way you explain.

nodzgreat -

thankyou very much.

keith -

Thanks for supportive/useful post

Suman Ponmathan -

Very Helpful.,thanks

Rey Mombay -

Excellent please give us more of the same, primarily to help with understanding of the subject matter at a basic level.

mike payne -

Excellent and elegantly simple guide.

Stewart Shackleton -

Thanks you so much for this.For me as a beginner,I didn't find difficulties in reading this but its fruitful one.

Jhed Saldavia -

thanks a million

claude.staples -

It was just awsome.Before your tutorial it just was looked like some alien device to me and now I think it's having very simple working principle. I am now pretty confident to work with it. A very big thanks.

Biswarup Majumdar -

Indeed awesome. Lots of thanks for such a generous sharing of knowledge. Be blessed

prince -

very helpful,thanks

silvester -

very simple and accurate

daniel -

Awesome thanks.. I knew you could use this for a lot of things but not this much.

Lynn Comstock -

I have a problem with my multimeter (Mastech MY74), the first thing I did was stupid, haven't read the user manual and tried it on a live socket and now it doesn't want to work. I have changed the fuses (600V, 0,4A and 10A), but it still doesn't work. Does anyone have an idea what else could have went wrong and how to test it?

Best regards

Rebius Noir -

Very useful. I liked the statements like ‘this will not harm the multimeter but will show negative reading ‘. For non science folks like me, these questions crop up often so this guide takes away the anxieties.

Ninad Kajale -

Nice article with great illustrations.

Apart from measuring DC voltage, resistance and continuity, they can also measure AC voltage, DC current, transistor and Diode checking, which I learnt from here https://circuitdigest.com/article/how-to...

merchan -

Following the KISS method of instruction!

Very well done!

JD Stewart -

marvellous explanation for a layman good luck& thanks

Ajmeet kaur -

Excellent guide. Very well explained and easy to use.

Simon Watts -

Dead easy. Very impressed.

Mark Sanders -

What to say except that you are the best !!!

Samir -

Good information. Thank

Masthan S -

Thanks a lot. :) My fear with multimeter is gone now. I am able to measure with confidence.

Jaya Saxena -

Can multimeters be used to measure salinity in water?

Ella Post -

Jeff, thanks for your step by step multimeter guide. I have also written https://bestmultimeterreviews.org/ similar article in my blog. But, your article is much better than me.

Ciffakla Notam -

Simple, easy to understand, well presented. Very helpful thanks.

Nicholas Topley -

Literally helped me passed my physics test; thank you!

KATE HUT -

Thank you very much !! Nicely explained and very easy to read with the pictures provided

larykir -

Tanks very much….Its really

Austine Taiwo -

you put a lot of effort in making this tutorial. I appreciate it.

hurshell -

Thank you. Very clear and thorough.

Choymae Huie -

Thank you for the helpful information, simple for novice to understand.

mark long -

Very helpful :) Thank you.

john schulz -

Very helpful… Thank you

Rhon -

Very helpful, thanks.

Daniel -

Cool keep up the good work and thanks

Pete Garcia -

Great for beginners, thanks

Mark -

thanks for a very easy tutorial, it is very helpful! pl add some additional examples to have better understanding for beginners.Thank you

sateesh

Challa. Sateesh -

Thank u for the precise description,very very useful for beginners.

A MAZUMDER

Arunava Mazumder -

thanku for guide!!!

sencotech khan -

I studied multimeter in my 11th grade and since then, haven’t been around these things for a long time! I was glad to go through the above instructions and as my nephew has been studying physics as well, I was able to guide him through some subjects which really gave me a good day and made my nephew happy. Thanks a lot.

Charles Brown -

thanks for this info.

daud john -

Very good explained well. Thank you.

Colm Gibson -

Exceptional directions and explanations for each step. Even an inexperienced user (such as myself) can understand and follow the instructions. So hard to find such detailed instructions for those that “want to be in the know”!! Kudos! You deserve 4+ Stars :)

Elaine Shapiro -

We thank you for the information

zenyao masilela -

I was always confused about electricity and how to test it but your instructions have given me a better understanding of it. I now have a place to go to for future reference. Thanks.

davidleithead -

thanks for the lucid description of the three phases of testing an electronic item; good job!

Jayaraman Raju -

An excellent guide. Thank you.

Kevin Dyck -

Thanks, that's helpful to me

Congrats for showing us the best way use it

Abdul Ndove -

Excellent guide Thank you!!!!

Hubulaoo kunafufafaaa -

Easy and simple to understand!! Thank you

John -

Show us the hard stuff like MX10 android box main board how to test thank u

alf -

Well. .. thank you, this is awesome

protyp Kariba -

thank you very much

Sisay alemayehu -

Well done. You've explained it in detail and was completely understandable. Tm

Todd Martens -

Good Content …………..Easy to Learn!

https://www.multimeter-uses-hindi.com

Shah Jahan -

When testing a Tweeter the multimeter reads OL on the resistance scale. What does this mean?

walkad@internode.on.net -

Really helpful

Richie boateng -

Very simple and easy to understand. Thank you very much for your help, now I can use a multimeter now.

Lala Hetman -

Very informative ; Thank you ?

Abdus van harte -

Thank you so much for making it so simple to follow. Because before I new what I was doing I got the all wires mixed up on my car battery. And I nearly melted my fingers to the wires. So thanks again c foley… craigfol659@gmail.com

Craig Foley -

Very good explained! Thanks.

Ove Aarstad -

easy to understand

Adriaan Cooke -

Thanks for teaching me

mokatsi phalamotse -

Thanks very helpful

Kenny Miller -

Thanks. Very Helpful

Kenny Miller -

Thank you so much easy and healpful

Goodluck Minja -

Thank you! Great how to advice for a beginner!

bobtruck7140 -

Knowing how to test continuity safely and quickly will both increase confidence near electronics — is that circuit LIVE? — and significantly decrease repair time.

nicO Gurney -

Thanks for the very detailed guide, good content and quality pictures.

AC is not dangerous, even V's aren't. Everyone must get worried about A's.

Sadly, you didn't include how to measure A (amperage or current), which always causes troubles to measure, to learn and understand.

Nicolas Pascual -