Basic Function of an Oscilloscope

[Fu-Kwun Hwang]

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This java applet shows the basic functions of an oscilloscope.
The oscilloscope is an electronic instrument widely used in making electrical measurements.
The main component of the oscilloscope is the cathode ray tube (CRT).
The CRT is a vacuum tube in which electrons are accelerated and deflected under the influence of electric field. The electrons are deflected in various directions by two sets of plate placed at right angle to each other in the neck of the tube.
Signal for the horizontal deflection plate (X-axis) is generated by the scope
It mathematic form is Fx(t)= C t + D (default)
C : time scale
D : horizontal offset
The external signal (need to be measured) is applied to the vertical deflection plate (Y axis).
The default form for this java applet is Fy(t)=A sin(w t + B)

You can change X or Y axis signal to either kind of signal.

It can be operated in different mode

	X = C t + D	X = A sin( w t + B)
Y = A sin(w t + B)	default mode	Lissajou's figure
Y = C t + D	not supported for an oscilloscope

For parameter B please enter value in degree.
Click within one of the knobs and drag the mouse button clockwise/countercolockwise to change values for Time/Div, Volt/Div , yOffset and xOffset.

For example: You can produce Lissajou's figure:

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There are 13 translations, select to view translated versionภาษาไทย - Thai(by npitanil: 121)العربية - Arabic(by BENAMA: 16)Ελληνικά - Greek(by ablioum: 19)Română - Romanian(by aurelia: 15)Nederlands - Dutch(by k.schonenberg: 15)Nederlands - Dutch(by marcsch: 13)Deutsch - German(by marcsch: 15)English(by gphillips: 19)中文 - Chinese traditional(by tcj: 15)Deutsch - German(by first0ne: 0)Русский - Russian(by Irina_S: 0)English(by normizs: 0)English(by NAMANSAR: 0)
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[Jeanke]

Hi,

is it possible to download this applet?
I'm very interested, because I have to make an end work for school.

Greetz,

Jeanke

[Fu-Kwun Hwang]

You will find "GET APPLET FILES' button at the end of the first posted message if you are a registered user and login to the system.
When you click the button, you will get files related to the applet in your email.

[bobsmith]

is possible to actually obtain the code for this in *.java format?

[Fu-Kwun Hwang]

You shpuld have received in your email account.
 However it was written many years ago with JDK1.0.2.
You might need to make some change to make it works with current verison JDK.

[mcbeeone]

This is a very nice demo. I think I shall have my students try it BEFORE I let them touch the real thing.

[abby]

than you sir for this demo

[raktekan]

thank you

[jack]

is possible to obtain the code for this in *.java format?

[Fu-Kwun Hwang]

Could you let me know why you need the source code?

[jack]

i need it for a project to my students

[Fu-Kwun Hwang]

You should have received the source code now. However, could you tell me what you want to do with it?
Is there something need to be improved for the applet?
Let me know and may be I can help.

[DolphinDream]

Hi, I was wondering...maybe you can help me with similar program. I need to make a program that calculates frequency of, how i say it in english, coinciding of two frequencies.
For example if i had two frequencies in Hz:
__|'''''|____|'''''|____|'''''|____|'''''|____
__|''''''''|______|''''''''|______|''''''''|____
I need a program that calculates frequency when both of them are '''''.
 

[Fu-Kwun Hwang]

Are you talking about the beat product from two very close frequency signal?

[DolphinDream]

Are you talking about the beat product from two very close frequency signal?

Yes, i think so... i need a program that calculates frequency...if i put two frequencys ontop eachother, then in what frequency they are at same point (that is at max).

[Fu-Kwun Hwang]

Assume one of them is y=y0 *sin(w*t) another one is y=y0 *sin((w+dw)*t)
And add those two wave together y=y0 *sin(w*t)+y0 *sin((w+dw)*t)
Work out the mathematics, you can find out when you will get maximum (or minimum)...

[farrukh]

can i pls get the source code
thx

[Fu-Kwun Hwang]

You can find the source code as attachment of the first message.
It was written almost 10 years ago with JDK1.0.2
Some code might need to be modified to use with latest JDK.

[chatria]

hello Prof. Fu-Kwun Hwang
   
What is the offset? Referring to the oscilloscope, and also in general terms I would like to know its meaning, for example, I have heard this term in electronica

 
thank you

[Fu-Kwun Hwang]

I do not fully understand what is the "offset" you are talking about?

Do you mean the DC voltage component in the Y axis?

I would not be able to help if I do not understand your question.

[arufuredo]

the file that i download is oscilloscope.rar. Inside this rar file, there is only oscilloscope.class and knob.class. May i know where can i download oscilloscope.java , which is the original source code? i am currently doing my final year project on a website that introduce the school oscilloscope and this applet is very useful to me. i have some experience with java , and i hope i can get the java file and modify it to introduce more controls of the oscilloscope. This is the link to the current oscilloscope website of my school , http://www3.ntu.edu.sg/home/askklee/scope/ .

someone please sent the code to my email , arufuredo2@msn.com

[Fu-Kwun Hwang]

Please download the source code (attachement file of the first message) by yourself.

[arufuredo]

sorry for my mistake, i finally spotted the oscilloscope.java file. May i suggest including the oscilloscope.java file inside the oscilloscope.zip so that it is easier to find instead of having to download them separately?

[Rare]

This simulation show this objective "Computer simulations, or demonstrations using a cathode-ray oscilloscope, are powerful methods of demonstrating alternating currents {( deduce that the mean power in a resistive load is half the maximum power for a sinusoidal alternating current), ( represent a sinusoidally alternating current or voltage by an equation of the form x = x_osinωt), is it? Correct? ???Thank you very much

[Fu-Kwun Hwang]

No. The purpose of the simulation is to show how the oscilloscope work -- what are the signal of x/y component look likes.
The signal in the x compinent is sawtooth shap -- to represent the time.
The oscilloscope show the signal as a function of time.

When two signals are feed to x/y simultaneously, you will find Lissajou's curve.

And it can be used to teach student how to operate an oscilloscope (basic function), too.

[cdurfee]

This is a nice applet. One suggestion is to have a mode which is slightly more realistic where the time/div and volts/div are incremental (and have the same units) in the same way as on a real scope. Also, on a real scope there would be a knob for moving the trace vertically (moving the ground reference) as well as a voltage offset. 

[Fu-Kwun Hwang]

Thank you for your suggestions.
There are many different kinds of oscilloscope.
Yes. There are many oscilloscopes which the time/div and volts/div knobs are fixed steps.
However, there are also digital oscilloscopes which the time/div and volts/div knobs can be adjusted continuously.

The above simulation already provide a yoffset knob for moving the trace vertically.

The purpose for the above simulation is to help user understand how the trace of the oscilloscope was formed.
That is why it provide options for users to select types of X/Y functiona: A sin(wt+B) or C t +D


If you need a simulation which is very similar to the one you are using. I will try to create one for you if you can provide a picture of the oscilloscope need to be simulated.