Solved

surface mount resistors

Posted on 2016-07-24
7
118 Views
Last Modified: 2016-07-24
I am trying to repair a circuit board where several of the surface mount resistors have come lose.
I am trying measure the resistance, but the measured values don't quite match what is stamped on top.

The resistors that have "180" on top, almost exactly have that as a measured resistance ohms.

The resistors that have a value of "510" stamped on top, have a measured value of "50".
Is there a implied decimal point ??
0
Comment
Question by:sidwelle
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
7 Comments
 
LVL 94

Expert Comment

by:John Hurst
ID: 41726835
Is there another resistor of the same stated value to measure?  Unless there is a K or M or some other marking, you would expect the resistor in question to be 510 ohms, just like the 180 ohm resistor. There is not a standard for printed values but markings usually make it clear.

You need either a comparable resistor or manufacturer spec sheet to be sure.
0
 
LVL 12

Expert Comment

by:funwithdotnet
ID: 41726851
Ignoring measurement technique- a number may match or be totally unrelated to resistance. You can't count on it. Even a match can have quite a bit of tolerance.  *If the package is not charred or damaged and is connected properly, there is a 99%+ chance that it will work properly, regardless of the measurement. *A rule of thumb from way back in my circuit component troubleshooting & repair days.
0
 
LVL 94

Expert Comment

by:John Hurst
ID: 41726853
Mostly today, numbers on a component have meaning. This is true for the stuff in my shop downstairs..
0
Enterprise Mobility and BYOD For Dummies

Like “For Dummies” books, you can read this in whatever order you choose and learn about mobility and BYOD; and how to put a competitive mobile infrastructure in place. Developed for SMBs and large enterprises alike, you will find helpful use cases, planning, and implementation.

 
LVL 12

Accepted Solution

by:
funwithdotnet earned 250 total points
ID: 41726855
I forgot ... 510 = 51 ohms.
1
 
LVL 94

Assisted Solution

by:John Hurst
John Hurst earned 250 total points
ID: 41726858
So then why is the "180" ohm resistor measuring 180 ohms. A given manufacturer would use the same numbering technique (which may not be standard).
1
 

Author Closing Comment

by:sidwelle
ID: 41726864
0
 
LVL 94

Expert Comment

by:John Hurst
ID: 41726872
Thanks. It is always the spec sheet that will tell you.
0

Featured Post

Connect further...control easier

With the ATEN CE624, you can now enjoy a high-quality visual experience powered by HDBaseT technology and the convenience of a single Cat6 cable to transmit uncompressed video with zero latency and multi-streaming for dual-view applications where remote access is required.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
HP Probook 4555b WWAN Card 2 39
assignment of laptops - risks 6 86
What does Windows SKU stand for? 7 30
Advantages of using Mac Outlook vs Mac Mail 2 53
I've been asked to discuss some of the UX activities that I'm using with my team. Here I will share some details about how we approach UX projects.
In the modern office, employees tend to move around the workplace a lot more freely. Conferences, collaborative groups, flexible seating and working from home require a new level of mobility. Technology has not only changed the behavior and the expe…
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question