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Transcript
1 EE 207 LABORATORY No. 10 SPECTRUM ANALYZER Scope: During this lab. you will: Use a spectrum analyzer Explore harmonic generation Determine the harmonic component of an output signal Observe the change in harmonic distortion between input and output signals Prelab: Review section 15.3 and 15.4 of Dorf et al : Introduction to Electric Circuits 1.-Using the results of last lab. fill out the columns labeled “Computed values” table 10.1. (Input Signal) Use 1 V as the amplitude of the fundamental harmonic. Order Harm. 1 3 5 7 Table 10.1 (Input Signal) Square Wave Triangular Wave Computed Measured Computed Measured Ampl. Ratio Ampl. Ratio Ampl. Ratio Ampl. Ratio Vn/V1 Vn/V1 Vn/V1 Vn/V1 1 1 1 1 1 2.- For the circuit shown in figure 10.1 determine the transfer function, (the output is the signal (voltage), at point A) The fundamental frequency is 1 kHz. Use these results and the results recorded under “computed values” in table 10.1 to determine the amplitude of the output harmonics and fill out table 10.2 (“Calculated Values Columns”) Remember that in the circuit model you have to include the internal resistance of the inductor. Table 10.2 (Output signal) Order Harm 1 3 5 7 D:\582711106.doc Mag. of trans. funct. Square Wave Triangular Wave Amplitude Output Calculated Measured Amplitude Output Calculated Measured 2 EE 207 LABORATORY No. 10 SPECTRUM ANALYZER . A Figure 10.1 In-lab: Notice: It will be in room 612 3.- In the lab you will find the harmonic components of the input signal and the output signal using a network analyzer and find the values needed to fill out the columns measured values. 4.- Connect the function generator using a sinusoidal signal with a frequency of 1 kHz (the frequency will remain constant) to the primary of a transformer (they were used in experiment Nr. 3). Starting with an input amplitude of 1 V, increase the amplitude and record the harmonics of the voltage recorded at the secondary terminals of the transformer for various input voltages and fill out table 10.3. Harm. Table 10.3 Harmonic content of the secondary voltage of a transformer Amplitude 1V 2V 3V 4V 5V 6V 7V 1 2 3 4 5 6 Tips for operation of the spectrum analyzer. i.-Center the frequency Span knob of the spectrum analyzer to 25 kHz ii.- Push the Set Ref buttom. The reference frequency will be set to 0 Hz. For each of the harmonics you measure 1000 Hz will have to be added iii.- Set the scale to Linear (You can experiment with the 10 dB/div scale) and the Passband Shape to Hanning. Report: Cut and paste this report in your lab note book. Fill out the tables before and during the lab. Lab-books will be collected and graded. D:\582711106.doc 3 D:\582711106.doc