Quantcast
TIME-DOMAIN REFLECTOMETRY

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
5-24 Q-7. When referring to spectrum analyzers, what is meant by the term resolving signals? TIME-DOMAIN REFLECTOMETRY TIME-DOMAIN REFLECTOMETRY is a testing and measurement technique that has found increasing usefulness in testing transmission lines (both metallic and fiber-optic), cables, strip lines, connectors, and other wideband systems or components. Basically, time-domain reflectometry is an extension of an earlier technique in which reflections from an electrical pulse were monitored to locate faults and to determine the characteristics of power transmission lines. You can compare time-domain reflectometry to a closed-loop radar system in which the transmitted signal, a very fast step pulse, is fed into the system and the reflections resulting from discontinuities or impedance deviations in the system are monitored on a crt. The technique used in time-domain reflectometry consists of feeding an impulse of energy into the system and then observing that energy as it is reflected by the system at the point of insertion. When the fast-rise input pulse meets with a discontinuity or impedance mismatch, the resultant reflections appearing at the feed point are compared in phase, time, and amplitude with the original pulse. By analyzing the magnitude, deviation, and shape of the reflected waveform, you can determine the nature of the impedance variation in the transmission system. Also, since distance is related to time and the amplitude of the reflected step is directly related to impedance, the comparison indicates the distance to the fault as well as the nature of the fault. Figure 5-25, view A, view B, view C, and view D, illustrates typical transmission line problems that can easily be identified by using a time-domain reflectometer (tdr). In addition to showing both the distance to and the nature (resistive, inductive, or capacitive) of each line discontinuity, time-domain reflectometry also reveals the characteristic impedance of the line and indicates whether losses are shunt or series. They are also used to locate and analyze connectors and splices. Figure 5-25A.—Time-domain reflectometer display of transmission line problems.


Electrical News
The Big Fat Indian Election
Technology and data analysis have come to play a crucial...
eetimes.com
Are PCB Layout Designers an Endangered Species?
Are PCB layout designers as a group poised to fade...
eetimes.com
Motorola People, Products Remembered
As some of the last big chunks of Motorola going...
eetimes.com
10 Space Exploration Trends to Watch
The machines continue to perform splendidly across the solar system....
eetimes.com
Samsung's Galaxy S5 BOM Tops $250
IHS has estimated that the Samsung Galaxy S5 smartphone carries...
eetimes.com
Current Status of the Robot Apocalypse From EE Live! 2014
Max has supreme confidence that seeing a "genuine counterfeit moustache"...
eetimes.com
How the Heartbleed Bug Performs Its Nefarious Activities
I have to say that this is the clearest explanation...
eetimes.com
Correlated Electron Memory Claims From 4DS
Ron Neale takes a closer look at 4DS Inc.'s reported...
eetimes.com
Google Contact Lens Patent Points to More Wearables
In a filing from the US Patent office, Google is...
eetimes.com
Google Unveils Modular Phone
Mod is back, according to officials from Google's Project Ara...
eetimes.com
Galaxy 5 Shows Innovation Slowing
Samsung's Galaxy 5 shows innovation in smartphones is shifting from...
eetimes.com
Registration Opens for Microchip's MASTERs Conference
This conference is a great chance to meet Microchip's subject-matter...
eetimes.com
AllJoyn: A Common Language for Internet of Things
Open-source lingua franca aims to let IoT devices and services...
eetimes.com
Faster Cryptocurrency Mining With Digital Power
Mining for digital currency has created the latest race for...
eetimes.com
Micron Workers Approve Italian Jobs Deal
The deal between Micron and its Italian workforce will save...
eetimes.com
Networking for the Internet of Things: Not so Fast!
Today's engineers are trained and prepared to tackle the challenges,...
eetimes.com
Faroudja's Bit Rate Reducer Gambit
At the NAB show, Yves Faroudja and his new startup...
eetimes.com
Gartner: Windows XP End Boosted Q1 2014 PC Sales
The ongoing move to tablets and smartphones continues, but the...
eetimes.com
EEVblog #603 – Gas Sensor Teardown – Dräger Multiwarn II
What’s inside a Dräger Multiwarn II gas detection warning system...
eevblog.com
Can Cities Really Be Tech Centers?
It depends on how you define technology. That is, from...
eetimes.com
   


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +