Wednesday, March 23, 2016

Detect defective components using handheld multimeter

Previous part covering methods on how to detect hotspot for potential failure during PCBA troubleshooting can be found here.

Apart from dry joints, defective or out of tolerance components are among common causes of failures on a circuit board. Component checking using a handheld digital multimeter is commonly performed when determining the root cause of failures.

Diode test

Typically, diodes and transistors are checked using the diode test function. The digital multimeter sends a current through the semiconductor junction and measures the voltage drop between the test points of the semiconductor device. For non-defective diodes, the digital multimeter normally shows a value of between 0.3 V to 0.8 V at the forward bias condition, and it shows an open circuit (with O.L. on the display) at the reverse bias condition. Defective diodes will appear as either an open circuit or a short circuit in both directions. Sometimes, diode test reading may vary due to the resistance of other pathways between the test probe tips. When this happens, it is recommended to isolate the component by removing it from the circuit board, and performing the test again.

Resistance and capacitance measurements

In many circumstances, electronic devices that failed in quality assurance testing during the production stage due to components such as resistors or capacitors being out of tolerance. The component accuracy range for resistors and capacitors are relatively large. The accuracy for resistors typically range from ±1% and above, whereas capacitors have an even bigger range normally starting from ±20%. These commonly found components on a circuit board are tested using a digital multimeter to verify if the values fall within the accepted range. These component tests allow the technician to quickly detect the problematic components at the work bench.

The typical capacitance measurement for 4 ½ digit handheld digital multimeter may starts at  10 nF range with 0.001 nF resolution. To test the capacitor value below this range, use a handheld LCR meter with a wider measurement range from 20 pF range with 0.001 pF resolution to 20 mF range.


The Keysight U1730C Series handheld LCR meters perform quick and basic LCR measurements of the components. Coupled with the U1732B SMD tweezer, SMD-type component measurement can be easily made.  By connecting to a power adapter, the LCR meter will operate like a benchtop eliminating the worry about the limited battery life.

Figure 4 Keysight U1732C handheld LCR meter is used at a PCBA debug station
Next posting will discuss about signal probing and other methods technicians use to accelerate troubleshooting tasks.

53 comments:

  1. This is a great post. I like this topic.This site has lots of advantage.I found many interesting things from this site. It helps me in many ways.Thanks for posting this again. Search Engine Optimization Kansas City

    ReplyDelete
  2. Awesome blog. I enjoyed reading your articles. This is truly a great read for me. I have bookmarked it and I am looking forward to reading new articles. Keep up the good work! Hostgator 60 off

    ReplyDelete
  3. hotmail.com Login & Sign in Microsoft Outlook Com is simple to browse Sign in page to type the User ID & Password to login Outlook inbox features instantly.

    ReplyDelete
  4. The article you have shared here very awesome.
    wuxiaworld

    ReplyDelete
  5. Thanks for sharing this valuable information to our vision. You have posted a trust worthy blog keep sharing.
    fun games

    ReplyDelete
  6. Thanks for the detailed instructions on how to detect the defective components using handheld multimeter.
    wings io

    ReplyDelete
  7. This is an well informative blog, thank you so much for sharing with us.
    Buy Essay Writing Service

    ReplyDelete
  8. Do you want to always write a perfect movie review?check this out and you will gain success!

    ReplyDelete
  9. Your topic is very nice and helpful to us.Thank you for the information you wrote.
    facebook baixar gratis

    ReplyDelete
  10. We are the best writing company providing Custom Assignment Writing Service at affordable rates. Our Assignment Online Services are student-oriented, and therefore we price our articles at student-pocket -friendly rates.

    ReplyDelete
  11. Wow you have a great blog here

    21 savage songs
    And I also love this category
    post Malone goodbyes


    Thansk for this information

    ReplyDelete
  12. Keywords are what internet user's type in to Google's search engine when they are looking for a product or service. this site We'd love to chat more about how to bring more views to your website, and then, what to do to keep them there.

    ReplyDelete
  13. Quickbooks is a well-known software for accounting solutions. if you are looking for any kind of assistance to get your issue resolved then you can chat with the agents at Quickbooks Helpline Number. they will help you to fix your issue with the best possible solution out.

    ReplyDelete
  14. Your article brought a lot of useful information to me. superfighters

    ReplyDelete
  15. The essayists also possess impressive How to Write a Nursing Research Paper credentials in their areas of specialization, with further training in creating high standard Already Written Essays.

    ReplyDelete
  16. Things are very open and intensely clear explanation of issues. was truly information. Your website is very beneficial.
    hotmail sign up

    ReplyDelete
  17. Wow, nice blog , I love this blog seriously, and you can follow us @ Fulloaded


    And also Download Latest Naija Music

    Even you can visit our Naija Freebeat

    ReplyDelete
  18. Thanks for Nice and Informative Post. This article is really contains lot more information about This Topic
    gmail login

    ReplyDelete
  19. Siapa yang bakal menyangka bila bermain judi bola online uang asli pakai modal 500 ribu saja mampu berhasil membawa pulang kemenangan 10jt di agen Poker Online.

    ReplyDelete
  20. I will carefully read the issues you just shared, I find there are some places that are not very clear
    atari breakout

    ReplyDelete
  21. Handheld multi meter is basically used to detect the defective components mostly in labs. Electrical engineers consider it as the main tool for checking whether the component is in working condition or not. By: essay help

    ReplyDelete
  22. Your review is very great and useful for me…thank you

    http://bit.ly/2Ipdrqq

    ReplyDelete
  23. Contact us for best price and deals ever

    Weblink:https://www.elightdocumentation.com
    Email: elightdocumentation@gmail.com
    Whatsapp No: +1 (318) 500-3487
    product link:https://www.elightdocumentation.com/grade-aa-fake-euro-for-sale/
    https://www.supercounterfeitbills.com
    https://www.bestqualitynotes.com
    https://www.flymedishop.com
    https://www.buymoneybills.com
    productlink.. https://www.elightdocumentation.com/where-to-buy-the-best-counterfeit-money/
    productlink.. https://www.elightdocumentation.com/grade-aa-fake-euro-for-sale/
    productlink.. https://www.elightdocumentation.com/buy-counterfeit-mexican-peso-online/
    productlink.. https://www.elightdocumentation.com/the-best-counterfeit-money-sale/

    Buy Counterfeit Mexican Peso Online

    Buy Counterfeit Mexican Peso Online. While our counterfeit currency is
    top-notch,
    you shouldn’t risk more than you need to. Don’t use fake money at any place that
    has professionals who can determine whether a banknote is fake or not.
    If you try to pay a fine with counterfeits, there is a high chance you will
    be caught pretty soon.

    What you should do instead is to pay for regular purchases in places
    where no one
    cares enough to check the money. Mix the real and the fake banknotes to lessen
    the chances of being caught even further. The two will look alike, however.
    Place an order now, and you can see it for yourself. Buy Counterfeit Mexican
    Peso Online
    Buy Counterfeit Mexican Peso Online

    Contact us for best price and deals ever

    Weblink:https://www.elightdocumentation.com
    Email: elightdocumentation@gmail.com
    Whatsapp No: +1 (318) 500-3487
    product link:https://www.elightdocumentation.com/buy-counterfeit-mexican-peso-online/
    https://www.supercounterfeitbills.com
    https://www.bestqualitynotes.com
    https://www.flymedishop.com
    https://www.buymoneybills.com
    productlink.. https://www.elightdocumentation.com/where-to-buy-the-best-counterfeit-money/
    productlink.. https://www.elightdocumentation.com/grade-aa-fake-euro-for-sale/
    productlink.. https://www.elightdocumentation.com/buy-counterfeit-mexican-peso-online/
    productlink.. https://www.elightdocumentation.com/the-best-counterfeit-money-sale/

    ReplyDelete
  24. Saat ini Bakarat merupakan salah satu permainan yang populer di Kasino seluruh dunia, termasuk juga casino online. Untuk itulah, mengapa kami memutuskan untuk membuatkan panduan ini, agar bisa memudahkan para pemain ketika ingin cara main baccarat ataupun live baccarat.

    ReplyDelete
  25. I will carefully read the issues you just shared, I find there are some places that are not very clear
    FNAF: Sister Location Custom Night cool math games

    ReplyDelete

  26. I hope this is just begin of your writing. If you want you can check my blog as well. Of course if you want. You have done a great job on this article. It’s very readable and highly intelligent. You have even managed to make it understandable and easy to read. You have some real writing talent. Thank you. NAJ Clearance Sale

    ReplyDelete
  27. The function generator transmits a power through the semiconductor intersection and tests the voltage fall between the measuring points of the solar cell. I am Mister Saad well known for mobile application developer working on the latest technology and create Advanced IOS and Android apps click to know more updates!

    ReplyDelete
  28. Hello! I would like to provide a huge thumbs up for any excellent info you’ve here within this post. I will be coming back to your blog site for more soon. cloud hosting

    ReplyDelete
  29. Excellent blog, it’s really helped me a lot, so keep sharing post like this
    Prioritize Wi-Fi Networks on iOS

    ReplyDelete
  30. i’ve been browsing online more than 4 hours today, yet I never found any interesting article like yours.
    It is pretty worth enough for me.best lyrics website

    ReplyDelete
  31. Using methods such as voltage measurement, short-circuit testing or ... you identify the fault of the Fluke multimeter so there is a way to repair, replace it appropriate

    http://potty-racers3.com/

    ReplyDelete
  32. We appreciate you sharing this blog article. Really looking forward to reading more and more. Great content play cool math games Big thanks for the valuable information.

    ReplyDelete
  33. Nice blog, it’s really helped me a lot, thanks for sharing!!! Android App Development Company

    ReplyDelete
  34. First grade counterfeit money

    Our bills/notes bypass everything, counterfeit pens and machines.- Can be used in banks but can be used else where same like
    normal money- We have the best HOLOGRAMS AND DUPLICATING MACHINES- UV: YES.
    we offer the best international services. we deal with over 200 different currencies, we are one of the best in what we do if not the best,
    our products are 100% guarantee.please contact us through;

    CONTACT US FOR PRICE AND MORE DETAIL
    Email : info@counterfeitmoneyonline.net
    Website: http://counterfeitmoneyonline.net
    Text/call/whats app: +1 213-394-2908

    ReplyDelete
  35. PCBs are more complicated to repair today than even a few years ago. Manufacturing mistakes and in-service component failures have become a fact of life. Circuit boards will be manufactured with errors, Read more at Best Assignment Service websites.

    ReplyDelete
  36. I am very grateful you did share your knowledge here. It is an excellent post. Thank you so much for providing such useful content
    unbreakable mugs

    ReplyDelete
  37. If you have idea or you want to online business then visit Lemon Communications websites. They provides web development cloud hosting services. Visit the website for further details Lemoncomm

    ReplyDelete