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 4  AC Circuit  Time-varying Signal  Oscilloscope  Function generator 2

Time-varying periodic signal (voltage)  Suppose the period is T .      Instantaneous value at time t: v t V  Average value  t T 0 1         v t v t dt V T t 0  RMS value  t T   0 1       2 2 V v t v t dt rms T t 0  Peak value     max T v t V      p t t t 0 0  Peak-to-peak value            V  max T v t min v t   p p       t t t t t t T 0 0 0 0 3

v(t) Sinusoidal signal (voltage) t 0 T/2 T  1 2  The period is   T  f            Instantaneous value at time t: v t A cos t V  Average value  t T 0 1          v t v t dt V 0 T t 0  RMS value  t T   A 0 1        2 2 V v t v t dt rms 2 T t 0  Peak value      max T v t V A      p t t t 0 0  Peak-to-peak value             V  2 A max T v t min v t   p p       t t t t t t T 0 0 0 0 4

Steady-State AC Analysis  Phasor Domain:  V Z I Resistor Inductor Capacitor 1     Z Z j L Z R  j C  Time Domain: 5 “CIVIL”

Oscilloscope Preparation Released Released Released Pushed Pushed Released Released Released Released 6

Function Generator 7

Demo 1  4 Vp-p Sinusoid 8

Part C Oscilloscope Ch-1 Ch-2 red black Z1 red Sine-wave generator R2 100 ohms black 9

Demo 2 10

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 11 10 15 20 25 30 35 40 45 50 55 60