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Oscilloscopes

Page history last edited by Akil Srinivasan 8 years, 11 months ago

Reading

XYZs of Oscilloscopes.pdf

Agilent oscilloscope manual.pdf

 

Assignment

Complete the following exercises. You don't have to read pages that aren't assigned, but you're encouraged to do so if interested.

 

1. Background

a. Read the following sections in XYZs:

'Introduction' on page 4.

'The Oscilloscope' on pages 7-9.

'Waveform Measurements' on page 11.

 

2. Orientation

a. Read the following sections in XYZs:

'The Systems and Controls of an Oscilloscope' on pages 18-21 and 26.

 

b. Look over the oscilloscope at your bench. Find the major controls.

 

3. Calibration of probe

a. Read the following sections in XYZs:

'The Complete Measurement System' on pages 32-33.

 

b. Get a 10:1 (or 10x) probe from the cable stand if you don't already have one at your station. Start the calibration procedure for the oscilloscope probes by connecting the probe from channel 1 to the PROB COMP signal on the lower right corner of the oscilloscope. Press autoscale. You should see a square wave. There should be an easily accessible adjustment screw on the probe where it connects to the scope. Referencing the images on page 45 of XYZs, use the trim screw to undercompensate, overcompensate, and then adjust for a perfectly square wave with no ringing or overshoot. Use a nonmetallic tool to turn the screw. Perform the calibration and use the probe with switch in the 10X position. Note: the exact frequency of the square wave may differ from the 1kHz label.  

See page 1-16 of the Agilent manual.

 

4. Signal Generator

a. Each bench is equipped with a signal generator module. Look over the controls and set it up to produce a triangular waveform output at about 1 kHz.

 

b. Connect the output of the signal generator to the oscilloscope via a coaxial cable and get a stable display. Set the Trigger Mode to Normal. Do not use Auto Triggering. Set the trigger slope to rising. Adjust the output of the signal generator to 1V peak to peak. Adjust the oscilloscope sensitivity so that the waveform is as large as possible, using standard settings only. Adjust the time scale so that at least 2 and no more than 5 complete cycles are displayed.

 

5. Trigger Level Control

a. Read the following sections in XYZs:

'Trigger System and Controls' on page 27 up to 'Other advanced trigger functions' and 29-30.

 

b. Experiment with the trigger level control. Notice how it sets where in the waveform the display begins. You should be able to move the starting point of the trace (the left edge of the screen) back and forth along the ramp in the triangular wave. Notice how the trace disappears as the level is set above or below the top and bottom of the waveform. The trigger level is set based on the input scale, so if you need to change the scale, you will probably also need to adjust the trigger level.

 

c. Set the trigger slope to falling, and observe that the trace now begins on the falling ramp of the wave.

 

6. Gain Familiarity

a. Observe the difference between a DC offset and the amplitude of an AC wave using the offset and amplitude controls on the signal generator. Play with the position of the movable ground reference on the oscilloscope.

 

b. Change the signal generator waveform to a different type, and experiment with viewing it. There is no substitute for familiarity when it comes to operating an oscilloscope, and you'll save time in later labs by knowing how to find an appropriate measurement or operating mode.

 

In The Report

There is nothing written required for this section of the lab.

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