lab_3_f07 - EE 350 LINEAR SYSTEMS ANALYSIS FALL 2007...

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EE 350 LINEAR SYSTEMS ANALYSIS FALL 2007 Laboratory #3: Fourier Spectra and Modulation The objectives of the second laboratory are to: Become familiar with HP 100 MHz oscilloscope as a signal analyzer. Measure the magnitude of the Fourier amplitude spectra, | C n | , of a sinusoid, a square and a triangular wave. Investigate the behavior of the spectral components of the product of two sinusoidal signals as the frequency of the signals are varied. Demonstrate envelope detection of an Amplitude-Modulated(AM) signal. 1 HP 100 MHz Oscilloscope as a Signal Analyzer The HP 54600-series 100 MHz oscilloscope in the lab is equipped with HP 54657 Measurement/Storage module that provides the scope with the capability to display the frequency spectra of the signal acquired on input 1, input 2, or the result in Function 1 (which to adds, subtracts, or multiplies the signals acquired on vertical inputs 1 and 2) and to display the result in Function 2. The front panel of the oscilloscope has knobs, grey keys, and white keys. The grey keys bring up softkey menus on the display that allow you access to many of the oscilloscope features. The white keys are instant action keys and menus are not associated with them. In this write-up, the front-panel keys are enclosed in square brackets and the softkeys are denoted by boldface. Generic steps to display the frequency spectra of a signal connected to the oscilloscope 1. Press [+/-]. 2. Toggle the Function 2 On O± softkey to enable math function number 2. 3. Press the Function 2 Menu softkey. 4. Toggle the Operand softkey until the desired source is selected. 5. Press the Operation softkey until FFT is selected. Results (F2) are displayed on the screen. 6. Press FFT Menu softkey. (FFT stands for Fast Fourier Transform which will be discussed at the end of the semester.) 7. Press Autoscale FFT softkey. Rotate Time/Div knob to set the frequency span of the measurement. 8. Press the FFT Menu softkey. A softkey menu with six softkey choices appears. Five of them are related to FFT: Cent Freq Allows centering of the FFT spectrum to the desired frequency. Select and rotate the knob closest to the [Cursors] key to set the center frequency to the desired value. Freq Span Sets the overall width of the FFT spectrum (left graticule to the right graticule). Select and rotate the knob closest to the [Cursors] key to set the center frequency to the desired value. Move 0 Hz to Left Pressing this key changes the center frequency so that the left most graticule represents 0 Hz. 1
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Autoscale FFT The Autoscale FFT softkey will automatically set Units/Div and Ref Level to bring the FFT data on screen. Window The signal on channel 1 is multiplied by a function called window. This softkey allows one of four windows to be selected. Select and rotate the knob closest to the [Cursors] key to set the desired window.
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This note was uploaded on 07/23/2008 for the course EE 350 taught by Professor Schiano,jeffreyldas,arnab during the Fall '07 term at Pennsylvania State University, University Park.

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lab_3_f07 - EE 350 LINEAR SYSTEMS ANALYSIS FALL 2007...

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