Intro to Lab Scopes
and
Wave Form Analysis


Learn lab scope terminology
Learn about lab scope
control functions
Learn vehicle circuit testing with a lab scope
Learn to understand wave form analysis!



Analog LAB SCOPE MANUAL
Updated 2007

This is a "how-to" analog dual-trace lab scope training manual covering the procedures to set-up and operate an analog dual-trace lab scope to troubleshoot the circuits of automotive electrical, automotive electronic and truck electrical and truck electronic circuits. This is also a great first manual for technicians to learn lab scope terminology and how to use a dual trace lab scope in auto electronics and truck electronics repair.

Although this lab scope manual is based on an analog lab scope rather than a DSO (Digital - Storage - Oscilloscope) it has a lot of value explaining lab scopes controls, terminology and wave form analysis to help you to understand your DSO. Eight Chapters cover aspects of using an analog lab scope with emphasis on how to analyze circuit wave forms produced by a lab scope.

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Lab scopes have been used in the electronics industry since the 1920's and now are finding new applications in auto electrical troubleshooting, auto electrical repair, auto electronic repair and driveability diagnosis. A lab scope is the ultimate troubleshooting tool for vehicle electrical repair and vehicle electronic repair. Once you learn to use a lab scope and realize its benefits you will wonder how you ever got along without one.

Detailed explanations on lab scope terminology, function of front panel controls and how to set-up an analog dual trace lab scope to perform a variety of critical auto and truck circuit measurements.

Learn techniques for DC voltage measurement and checking amplitude of electrical noise present; AC voltage measurement to determine amplitude andfrequency; measuring digital signals for amplitude, frequency and distortion including duty cycle wave forms as shown below.

 

 

 

 

Learn to measure AC waveforms for amplitude, frequency and reference to ground.

 

 




 

 

Learn to measure digital waveforms for amplitude, frequency, reference to ground, pulse width or time duration.

 

 

 

 

 

Section 7 is devoted to practice in analyzing wave forms and detecting when a misadjusted lab scope control may be the reason a wave form appears incorrect on the CRT but is correct in the circuit.

 

 

 

In the illustration to the left is a PWM (Pulse-Width-Modulated) wave form which has a fixed base frequency or time PERIOD. The PWM signal changes it's high (HI = B+) and low (LO = B-) time duration.

Start by looking at the top wave form then the next lower until you reach the bottom. Notice the HI time duration increases as the LO time duration decreases.

Next look at the bottom wave form and then the next higher until you reach the top. See the HI time duration decreases as the LO time increases.

That's how PWM wave form controls circuits. It's called Duty Cycle. You can see the changes in a PWM's duty cycle as it happens with a lab scope.

Section 8 has been added to the scope manual covering current ramping techniques. An updated 2017 version is now available with minor revisions and updates on duty cycle.

A wave form record sheet is provided so that you can build your own wave form record library covering the vehicles you work on the most. Even if you are using a digital lab scope exclusively, you will find helpful information in understanding lab scope terminology and wave form analysis.



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Veejer Enterprises, Inc.
Garland, Texas 75042-5419
Phone:  972-276-9642
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