Bas Basic ic El Elec. ec. En Engr gr. . Lab Lab EC ECS S - PowerPoint PPT Presentation

Bas Basic ic El Elec. ec. En Engr gr. . Lab Lab EC ECS S 204 04/2 /210 Dr. Prapun Suksompong prapun@siit.tu.ac.th Office Hours: BKD 3601-7 Tuesday 9:30-10:30 Friday 14:00-16:00 1

Lab 5  RC Circuit with Voltage Step Input  Frequency Response of Series RLC Circuit  AC vs DC modes of the Oscilloscope  AC vs DC modes of the DMM  Function generator: Offset 2

DMM: DC vs. AC  V DC = Average value  t T   1 0        V V v t v t dt DC T  V RMS = RMS value t 0  t T 1 0          2 2 V v t v t dt V RMS rms T t 0 Equal when V DC = 0.  V AC       2     2 2 V V v t V V V AC DC RMS DC 3

Oscilloscope: DC vs. AC    Input signal: v t      DC mode: Show  v t v t DC      AC mode: Show   v t v t V AC DC  v AC ( t ) always have 0 average (theoretically.      when V DC = 0.  v t v t AC DC 4

Function Generator: Offset       v t v t V out 0-offset Offset 5

Part A Oscilloscope Ch-1 Ch-2 1 k  + 4Vp-p  square 0.1 F wave  6

Reading Capacitor Code Code Value 0.001  F 102 0.01  F 103 0.1  F 104 0.047  F 473 0.47  F 474            4 4 1 2 4 6 6 47 10 p F 47 10 10 F 47 10 10 10 F           4 6 6 2 47 10 10 10 F 47 10 F  =0.47 F 7

Oscilloscope  Measurement Ch-1 Ch-2 1 k  + Three different methods: 4Vp-p  square 0.1 F wave  Measure t 0.37 .   Measure t half . Then, calculate   t half ln2  Measure R and C . Then, calculate  = RC .  4 V 0  2 V 2 0  1.47 V e 0    0.37 V 0 t 0.37 t half 8

Part B V 0 V 2 0 V R Oscilloscope Ch-1 Ch-2 f f 1 f 0 f 2 V 1 R2  f 0  2 LC L 100  Sine-wave C generator 9

Midterm Results (20%) 55 50 45 40 35 Scores 30 25 8 20 7 15 6 10 5 0 5 10 15 20 25 30 Student# 4 3 2 1 0 10 10 15 20 25 30 35 40 45 50 55 60