HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
REGISTER   |   LOGIN   |   HELP
<<  <  Page 2/2
Cliff Harris
User Rank
Iron
Re: Separate Grounds
Cliff Harris   8/28/2013 3:17:02 AM
NO RATINGS
The PC boards were laid out by a consultant. He had almost no communication with the engineer. He autorouted everything and did minimal checking. Understandable, as "time is money".

tekochip
User Rank
Platinum
Separate Grounds
tekochip   8/27/2013 6:07:12 PM
NO RATINGS
 This can be a bit of a pain with some software and and the typical solution is to create a component that is nothing more than copper attaching the grounds.  I had an engineer that created such a part, and placed the copper joining all the grounds on a new layer.  This was a great idea, but after he left the company the next engineer didn't know that the Gerber files needed to have that extra layer included.  That was a darn expensive mistake.


Nancy Golden
User Rank
Platinum
Potential for Unwanted Ground Loops
Nancy Golden   8/27/2013 1:22:51 PM
NO RATINGS
Grounding can be a tricky beast - Avoiding unintentional ground loops is often conceived and avoided at the design level. Looks like that software needs an additional library!

bob from maine
User Rank
Platinum
Re: cuaght by the software
bob from maine   8/27/2013 10:49:22 AM
NO RATINGS
From a design standpoint, separating anlog, digital, and different power supply gnd/returns is vital to the integrity of the circuit and isolation from noise. Measuring voltage on a 12V line requires you connect the scope-probe ground to the 12V return, likewise the 5V and 24V busses. If the designer isolated those lines, there is good reason to believe they should stay isolated. I can't argue with your success, but I'd guess that the problems you were trying to fix still exist and will evidence themselves in degraded performance and/or damaged components.

naperlou
User Rank
Blogger
cuaght by the software
naperlou   8/27/2013 9:23:43 AM
NO RATINGS
Cliff, this is an interesting situation.  The engineer was trying to keep track of the different grounds, but the software didn't know that.  What he did made sense, but then again, so did what the software did. 

<<  <  Page 2/2


Partner Zone
Latest Analysis
Eric Chesak created a sensor that can detect clouds, and it can also measure different sources of radiation.
Festo's BionicKangaroo combines pneumatic and electrical drive technology, plus very precise controls and condition monitoring. Like a real kangaroo, the BionicKangaroo robot harvests the kinetic energy of each takeoff and immediately uses it to power the next jump.
Practicing engineers have not heeded Yoda's words.
Design News and Digi-Key presents: Creating & Testing Your First RTOS Application Using MQX, a crash course that will look at defining a project, selecting a target processor, blocking code, defining tasks, completing code, and debugging.
Rockwell Automation recently unveiled a new safety relay that can be configured and integrated through existing software to program safety logic in devices.
More:Blogs|News
Design News Webinar Series
3/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
2/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
12/18/2013 Available On Demand
11/20/2013 Available On Demand
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Apr 21 - 25, Creating & Testing Your First RTOS Application Using MQX
SEMESTERS: 1  |  2  |  3  |  4  |  5


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: April 29 - Day 1
Sponsored by maxon precision motors
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service