Oscilloscopes


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The EPL has the three Oscilloscopes below available for use in the main lab. This page contains a general guide to Oscilloscopes and important information for each one available in the lab. Click the hyperlink to jump to the part of the page with information specific to each oscilloscope.

Table of Contents

Introduction to Oscilloscopes


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DANGER

Well, not to you but electric measuring equipment is sensitive. Please be careful with the equipment. If it’s given respect today it will be there tomorrow when you need it. If you’re not sure, ask a manager whether a given oscilloscope will work for your needs.

Probes

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An oscilloscope may be thought of as a sort of digital multimeter(DMM) with a short term memory. Unlike a DMM, an oscilloscope uses probes as seen in the image below.

There are other types of probes but this is the most common and works for this guide. There are four key parts to the probe:

Reading a simple DC Square Wave Function

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The TDS 3034 provides a calibration tool between the inputs for channel 2 and 3. hook up the probe and gorund as shown below.

Now turn on the oscilloscope using the power button in the bottom left hand corner of the faceplate. (left and below the screen). After a splash screen you’ll be confronted with some warnings. Just ignore the machine’s pleas for calibration and press menu/off until you see the second image below.

Notice on the screen and under the black box are some numbers. You should see CH# followed by some voltage (10.0mV~ here) then after the M in this image is “1.00us”. The “10.0mV~” refers to the vertical separation of the horizontal dashed grid lines on the screen. So from the top of the screen you can read voltages from 40mV to -40mV. The “1.00us” refers to the separation of the vertical grid lines. So from the left of the screen to the right you can read -10us to 0us.

At this point the oscilloscope is reading a signal output to the calibration port we’ve attached the probe to. Let’s find the signal and fit it to the window so we can admire it. on the face panel is a knob to adjust the vertical(magnitude/voltage) scale. Our signal should be 5V but we’re working in 10mV increments. Turn the knob counter-clockwise to increase the increment we are viewing on the screen. Once you’ve adjusted it to about 1V you should se something sort of similar to the image below.

notice the 2V increments in the above image.

Now adjust the horizontal scale until you see something like the image below.

Note the time scale is now 200us in the image above

Next try playing around with the horizontal and vertical position knobs to see what they do.

The Trigger

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Tektronix TDS7254


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Tektronix TDS3034


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Tektronix TDS380


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