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PhysLab_S10_Sky_ RLC Circuits - PhysLab_S10_Sky_RLC...

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PhysLab_S10_Sky_   RLC  Circuits Pinyin name: Tian Yunfan English name: Sky Date: 14/5/2010 Temperature: 25  ° C  Humidity: 72% PROBLEM DESCRIPTION     This   Lab   investigates   the   magnitude-frequency  characteristic and phase-frequency characteristic of  RC, RL, RLC series circuit (R means resistance, L  means inductor, C means capacitor). Moreover, we  should learn how to use dual-trace oscilloscope to  measure phase difference  φ .    In lab, the two problems were approached using  three   basic   scientific   methods.   First,   predictions  were   made   about   the   relationship   between  amplitude   and   frequency,   phase   difference   and  frequency. Second, date and graph were tested and  recorded.   Finally,   the   results   were   analyzed   and  conclusions were made.
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    The   lab   required   use   of   a   SS7802   dual-trace  oscilloscope,   function   signal   generator,   mill  voltmeter,   standard   capacitor,   inductor,   resistance  box, breadboard, switch and so on. PREDICTION     If the AC sinusoidal signal stays unchanged, the  relationship between voltage and frequency called  the magnitude-frequency characteristic; the relation  between   phase   difference   φ and frequency called phase-frequency characteristic.    The essential question is how U C  (the voltage of  inductor), U R  (the voltage of resistance) changes as  the   frequency   changes.   It   was   predicted  that   U increases, U C  decreases as f increases in RC series  circuit; U R  increases, U C  decreases as f increases in  RL series circuit; φ increases as f increases in RLC series circuit.
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