简介
你所需要的
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电路连通性测试可以告诉我们两个元件之间的电路是否连通:如果两个元件直接是连通的,那么电流可以自由的从两个元件之间通过。
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如果电路不连通,这意味着在这个电路中的某一点断开了。这可能表示保险丝熔断或者元件虚焊。
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将黑色表笔插入您的万用表上标有COM字样的插孔
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将红色表笔插入您万用表上标有VΩmA字样的插孔
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?
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.
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打开您的万用表,并且将拨盘转动到连通性测试模式(是一个看起来像声波的图标)
I want to search the resistance of gold and see if I have some
What does a sound wave look like?
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.
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万用表通过其中一支表笔输出一个微小的电流,然后确认另外一支表笔收到了多少电流来确定阻值
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如果两支表笔之间是连通的——不论是通过电路连通或是直接触碰两支表笔——都表示测试的电路是连通的。屏幕会显示一个0的值(或者接近于0——在这只万用表上的值为0.8)。得到一个非常低的电阻值即表示该电路是连通的。
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如果电路不连通,这表示电路是开路。屏幕会显示1或者OL(开路)
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..
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?
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.
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要完成一次连通性测试,只要将两支表笔碰触需要测试的电路或者元器件两端即可
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如之前提到的一般,如果您要测试的电路是连通的,屏幕会显示一个0的值(或者接近于0)
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如果屏幕显示1或者OL(开路),那就表示这个电路不连通——这意味着电流无法从一端流至另一端
What does it mean when I first get 1 then the meter jumps to all kinds of numbers and there is no beeping?
Most likely you have bad contact with whatever you are measuring.
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开始之前,请确认你要测试的电路处于非工作状态。请先将设备关机,拔掉电源插头并且卸下所有电池。
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将黑色表笔插入您的万用表上标有COM字样的插孔
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将红色表笔插入您万用表上标有VΩmA字样的插孔
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.
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1004等其他人完成本指南。
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132条评论
EASy and helpful indeed
Iwant to know hw to test caperstas
Thank you. Very easy and good training
Badar Omar - 回复
Very helpful for beginners, thanks for these clear instructions!
AndyBlaser - 回复
great article. thanks
thank you !!! for this info!!!
Thanks a lot this is very clear and helpful!
Thanks Jeff. I just purchased a cheap mm. All instructions were in Chinese. Your help made sense of it all, so easy.
Iwant to knw hw to test power suply
Brilliant thank you
Liam Breen - 回复
It truly does.
so nice Bro...Thanks a lot...
Thanks a lot
Love the resources on the Pro site.
Very good instructions
Nice guide.pl add some additional examples to have better understanding for beginners.Thank you
Nice guide. Pl add some additional practical examples. Thank you.
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?
Thank you, Haven't used one of these is ages; this was a great refresher!
thanks for a very easy tutorial, it is very helpful!
The basics. Soooo important. Well done, short and concise.
Most helpful thank you!
Had multimeter for a couple years, never knew how to make it beep!
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.
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.
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 - 回复
Beautifully put. I truly appreciate the lesson. I've learned something of impirtance. Thank you.
rickeybenn - 回复
it really useful for begginer
Thanks you for the lesson :)
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
Thanks you for the lesson :)
mrmannan05 - 回复
Thanks and had help me a lot
sinoncesar - 回复
Had help me a lot. Many Thanks
sinoncesar - 回复
Thanks , sometimes need too refresh with the basics.
Very informative! Easy to understand.
Well written.
Simple and easy thanks
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 !!!!!!
Thank you. This was very helpful to me. Very clear and easy to understand....
Thanks for supportive/useful post
Very Helpful.,thanks
Rey Mombay - 回复
Excellent please give us more of the same, primarily to help with understanding of the subject matter at a basic level.
mike payne - 回复
Excellent and elegantly simple guide.
Thanks you so much for this.For me as a beginner,I didn't find difficulties in reading this but its fruitful one.
thanks a million
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.
Awesome thanks.. I knew you could use this for a lot of things but not this much.
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
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.
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...
Following the KISS method of instruction!
Very well done!
JD Stewart - 回复
marvellous explanation for a layman good luck& thanks
Excellent guide. Very well explained and easy to use.
Dead easy. Very impressed.
Thanks a lot. :) My fear with multimeter is gone now. I am able to measure with confidence.
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.
Simple, easy to understand, well presented. Very helpful thanks.
Tanks very much….Its really
Thank you. Very clear and thorough.
Very helpful :) Thank you.
Helpful thanks
Cool keep up the good work and thanks
thanks for a very easy tutorial, it is very helpful! pl add some additional examples to have better understanding for beginners.Thank you
sateesh
Thank u for the precise description,very very useful for beginners.
A MAZUMDER
thanku for guide!!!
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.
Very good explained well. Thank you.
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 :)
We thank you for the information
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.
thanks for the lucid description of the three phases of testing an electronic item; good job!
An excellent guide. Thank you.
Kevin Dyck - 回复
Thanks, that's helpful to me
Congrats for showing us the best way use it
Excellent guide Thank you!!!!
Well. .. thank you, this is awesome
thank you very much
Well done. You've explained it in detail and was completely understandable. Tm
Good Content …………..Easy to Learn!
Shah Jahan - 回复
When testing a Tweeter the multimeter reads OL on the resistance scale. What does this mean?
Really helpful
Very simple and easy to understand. Thank you very much for your help, now I can use a multimeter now.
Very informative ; Thank you ?
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
Very good explained! Thanks.
easy to understand
Thanks for teaching me
Thanks very helpful
Thanks. Very Helpful
Thank you so much easy and healpful
Thank you! Great how to advice for a beginner!
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.
Hi how can I test a signal transmission through an ffc or fpc cable using a multimeter
That was a really clear and concise tutorial. Thanks.
Just one request. Could you do ones on other capabilities of a DMM, please? For example, measuring ampage, testing doids and LEDs.
Cheers Wal