Search RFCafe.com                           
      More Than 17,000 Unique Pages
Please support me by ADVERTISING!
Serving a Pleasant Blend of Yesterday, Today, and Tomorrow™ Please Support My Advertisers!
   Formulas & Data
Electronics | RF
Mathematics
Mechanics | Physics
     AI-Generated
     Technical Data
Pioneers | Society
Companies | Parts
Principles | Assns


 About | Sitemap
Homepage Archive
        Resources
Articles, Forums Calculators, Radar
Magazines, Museum
Radio Service Data
Software, Videos
     Entertainment
Crosswords, Humor Cogitations, Podcast
Quotes, Quizzes
   Parts & Services
1000s of Listings
 Vintage Magazines
Electronics World
Popular Electronics
Radio & TV News
QST | Pop Science
Popular Mechanics
Radio-Craft
Radio-Electronics
Short Wave Craft
Electronics | OFA
Saturday Eve Post

Software: RF Cascade Workbook
RF Stencils Visio | RF Symbols Visio
RF Symbols Office | Cafe Press
Espresso Engineering Workbook

Aegis Power  |  Alliance Test
Centric RF  |  Empower RF
ISOTEC  |  Reactel  |  RFCT
San Fran Circuits

Noisecom

Innovative Power Products Cool Chip Thermal Dissipation - RF Cafe

Anritsu Test Equipment - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low-priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads

These Are Available for Free

Espresso Engineering Workbook™

Smith Chart™ for Excel

Innovative Power Products Cool Chip Thermal Dissipation

Scope-Trace Quiz
March 1965 Popular Electronics

March 1965 Popular Electronics

March 1965 Popular Electronics Cover - RF Cafe  Table of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from Popular Electronics, published October 1954 - April 1985. All copyrights are hereby acknowledged.

Just yesterday I posted an article titled "Understanding Your Triggered Sweep Scope," that appeared in the May 1973 issue of Popular Electronics, so I figured this "Scope-Trace Quiz" would make a good compliment. It is from a 1965 issue of Popular Electronics. Driver circuits all include a sinewave source in parallel with a series resistor and diode, connected to the vertical and horizontal o-scope inputs. The resulting Lissajous waveforms resemble hands on a clock face thanks to the diode. Shamefully, I only scored 70%, but in my own defense I'll say I didn't take the time to draw them out on paper. Pay careful attention to the scope connections.

Scope-Trace Quiz

By Robert P. Balin

Scope-Trace Quiz, March 1965 Popular Electronics - RF CafeHow are you at vectors? Here's a chance to get some practice and test your scope sense. The vertical and horizontal input signals to an oscilloscope combine to form Lissajous patterns whose appearance depends on the waveform, frequency, and relative phase of the two signals. Knowing how these patterns are formed will help you to interpret waveforms and to have a better understanding of the scope. Test your ability to project (vectorially) the forces at work on the electron beam in the CRT. Six different oscilloscope traces are shown in A-F. Can you match them with circuits 1-6 below?

The resistor used in each circuit has a value equal to the reverse resistance of the diode. Forward resistance of the diode is negligible. The circuits shown do not load or distort the signal source. Both the vertical and horizontal gain controls have been set to provide equal gain. Positive-going signals cause the beam to be deflected upward for the vertical input and to the right for the horizontal input, The example at left shows the resultant trace derived from the same signal applied to both the vertical and horizontal scope inputs. Tips on how to solve this quiz appear with the answers (at bottom of page).

Oscilloscope waveforms - RF Cafe

 

See answers below.


Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Scope-Trace Quiz Answers

If you had trouble solving this quiz, consider the following facts:

(1) Output across the complete resistor and diode circuit is the same amplitude as the input signal.

(2) Output across the resistor only varies between 50% and 100% (100% when the diode is working in the forward direction).

(3) Output across the diode varies between 50% and 0% (0% when the diode is working in the forward direction).

 

 

 

Posted February 27, 2018

Innovative Power Products Cool Chip Thermal Dissipation
Amplifier Solutions Corporation (ASC) - RF Cafe

Copper Mountain Technologies (VNA) - RF Cafe

KR Electronics (RF Filters) - RF Cafe