L10_Oscilloscopes

# L10_Oscilloscopes - Physics 251 Laboratory Oscilloscopes...

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P251 Oscilloscopes Lab 1 Fall 2002 Physics 251 Laboratory Oscilloscopes, Signal Generators and Periodic Signals Introduction: An oscilloscope (often just called a ‘scope) is an instrument that will plot a voltage versus time graph. The horizontal axis of the scope is time and the vertical axis is voltage. Both axes are calibrated so you can read voltages and times off the screen directly in seconds or volts. If a signal has a regular period, then it is possible (though not always easy) to make the oscilloscope trace out a regular pattern on the screen. Oscilloscopes are probably the single most powerful piece of test equipment in the electronics world. It is unlikely that anyone can pursue a career in science or engineering without having to use one once in a while. Oscilloscopes are not as easy to use as, say, a multimeter, but they are well worth the trouble. A signal generator is a device that creates a periodic voltage signal. The amplitude, frequency and “waveform” (that is, sine wave, square wave, sawtooth wave, etc.) can all be controlled by adjustments on the device. We will use these generated signals as inputs to electronic circuits and observe the output of those circuits using the oscilloscope. Equipment and Supplies Signal Generator Oscilloscope Coaxial cables with clips (3) Coaxial cables without clips (1) Power supply Capacitor (40 μ F) Decade resistance box (Set at 50 ) Section 1 To set up the signal generator, follow this procedure 1. Connect a coaxial cable from the MAIN output of the signal generator to the CH1 input of the ‘scope. 2. Select RANGE to be 1K from the upper row of buttons on the signal generator and select a sine wave FUNCTION . 3. Set the Frequency knob to 1.2 and turn the AMPLITUDE knob all the way up. 4. Select VOLTS to be 0-20V and be sure the DC OFFSET button is pushed in. 5. Turn the signal generator on; the red LED above the switch should glow. At this point the signal generator will be producing a 1.2kHz sine wave with amplitude of 20V. To set up the ‘scope, follow this procedure 1. Push the ON/STBY button at the lower left corner of the ‘scope. Allow the Oscilloscope to “power up”.

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P251 Oscilloscopes Lab 2 Fall 2002 2. Push the CLEAR MENU button on the lower right corner of the screen to get rid of the startup message. 3. If there is no display, press the button labeled WAVEFORM OFF which is at the bottom of the vertical row of buttons on the main panel to the right of the screen. 4. Keep pushing this button until all of the green LED’s are off. 5. Press the AUTOSET button in the middle of the main pane. At this point a stable sine wave should be displayed. If you get into trouble later, you can always follow steps 3,4 and 5 to get back to a stable point. Now that a stable display has been achieved, turn your attention to the signal generator.
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L10_Oscilloscopes - Physics 251 Laboratory Oscilloscopes...

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