EE 201 Lab Lab 9. AC analysis. This week we look at some (relatively) simple AC circuits.
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1 A analyss Ths week we look at some (relatvely) smple A crcuts. In lab Buld each of the crcuts shown below. In each case, the source s a snusod. Varous ampltudes and frequences wll be used, as descrbed for each crcut. Use the multmeter to measure A voltages and currents. Use the osclloscope to measure phase dfferences. One way to do ths s to measure the lead or lag tme between the source voltage and the voltage of nterest. The cursors are handy for measurng tme dfferences. Usually, t s more accurate to measure the dfferences at zero crossngs rather than tryng to use peaks or valleys. If you are adventurous, you can try to use the phase measurement capablty bult nto the osclloscope. (Look under the measurement menu.) However, you should note that ths not always totally accurate. Be sure to brng a flash drve for recordng osclloscope traces. Be sure to measure the values of the resstors, nductors, and capactors used n your crcuts. alculate the expected magntude and phase for the voltages or currents of nterest n each crcut and for each frequency. Include the calculated values n your report. Note: As seen n lecture, the nductors have some parastc seres resstance. (Use the ohmmeter to measure the resstance, f you haven t done t prevously.) In some cases, the seres resstance can have a notceable effect on the voltages and currents n the crcut. In your calculatons for the crcuts wth nductors, you mght try ncludng the nductor seres resstance.!1
2 1. R crcut Set up the R crcut shown n Fg. 1. Set the ampltude of the source at 5 VRMS and the frequency at 3000 Hz. Use the multmeter to measure the ampltude of the resstor and capactor voltages. Use the osclloscope to observe the source voltage and the capactor voltage smultaneously, and measure the phase dfference between the source and the capactor snusods. Save a trace for your report. Use the math functons to dsplay the resstor voltage on the osclloscope. Measure the phase dfference between the resstor and source snusods. Then measure the phase dfference between the resstor and capactor snusods. (Recall that the resstor waveform wll have the same as the current, so the phase dfference between the resstor and capactor should be a famlar number.) Repeat all of the above measurements at frequences of 1 khz and 8 khz. Fgure 1. R 1.5 k! v R 0.1 µf v The table below may help you n collectng and organzng your data. 1 khz 3 khz 8 khz V V R θ S θ SR θ R!2
3 EE 201 Lab Lab 9 2. RL crcut Set up the RL crcut shown n Fg. 2. Set the ampltude of the source at 5 VRMS and the frequency at 5 khz. Use the multmeter to measure the ampltude of the resstor and nductor voltages. Use the osclloscope to observe the source voltage and the nductor voltage smultaneously, and measure the phase dfference between the source and nductor snusods. Save a trace for your report. Use the math functons to dsplay the resstor voltage on the osclloscope. Measure the phase dfference between the resstor and source snusods. Then measure the phase dfference between the resstor and nductor snusods. (Recall that the resstor waveform wll be the same as the current, so the phase dfference between the resstor and nductor snusods should be a famlar number.) Repeat all of the above measurements at frequences of 1000 Hz and 20 khz. Fgure 2. V S L 15 mh The table below may help you n collectng and organzng your data. R v R v L V L V R θ SL θ SR θ RL 1 khz 5 khz 20 khz!3
4 EE 201 Lab Lab 9 3. RL crcut Set up the RL crcut shown n Fg. 3 Set the ampltude of the source at 5 VRMS and the frequency at 3000 Hz. Use the multmeter to measure the ampltude of the resstor, capactor, and nductor voltages. Use the osclloscope to observe the source and resstor voltage waveforms smultaneously. Measure the phase dfference between the source and resstor snusods. Save a trace for your report. Swap the capactor and resstor n the crcut (so that the capactor and source share a ground connecton). Use the osclloscope to observe the source and capactor voltage waveforms smultaneously. Measure the phase dfference between the source and capactor snusods. Save a trace for your report. Swap the capactor and nductor n the crcut (so that the nductor and the source share a a ground connecton). Use the osclloscope to observe the source and nductor voltage waveforms smultaneously. Measure the phase dfference between the source and nductor snusods. Save a trace for your report. Repeat all of the above measurements at frequences of 1500 Hz and 7500 khz. Fgure 3. v L R L 15 mh 0.1 µf v v R The table below may help you n collectng and organzng your data. V L V V R θ SL θ SR θ S 1.5 khz 3 khz 7.5 khz!4
5 4. An op-amp crcut Yes, op-amps work just fne n snusodal crcuts. (And no, we wll never get away from opamps!) Buld the op-amp crcut shown n Fg. 4 usng an amp from the LM324 chp. Use ±15 V power supples. Set the ampltude of the source at 0.25 VRMS and the frequency at 2500 Hz. Use the multmeter to measure the ampltude of the source and output voltages. (As usual wth op amps, the output s measured wth respect to ground.) alculate the gan of the amplfer at ths frequency. Use the osclloscope to observe the source and output voltage waveforms smultaneously. Measure the phase dfference between the source and output snusods. Save a trace for your report. Repeat all of the above measurements at frequences of 1 khz and 7.5 Hz. (The phase measurements mght be trcker at the hgher frequency because the ampltudes wll be smaller. Do the best you can.) 10 nf R 2 Fgure 4. R 1 10 k! v o The table below may help you n collectng and organzng your data. v o G θ SO 1000 Hz 2500 Hz 7.5 khz Reportng Prepare a report dscussng your calculatons and measurements from each part of ths lab. Be sure to nclude your calculatons. (You may not know how to do the calculatons today, but you wll be able to do them wthn a couple of days.) The report s due n one week at your lab tme.!5
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