Page 23 - eAD113_電子學含實習

Chapter 0 xʈτሊ͛eऊԣτΌٙႩᗆʿᄃኜ዁Ъ

範例 4

˸ͪتኜඎ಻ݔָ͍تཥᏀৃ໮dՉتҖνྡהͪ€಻༊ಏ࠴ଟ

1j1d1.0V/DIVd2.5ms/DIVdɨΐાࠑО٫͍ᆽk
(A) ༈ཥᏀৃ໮ٙ඄ಂމ 20msc(B) ༈ཥᏀৃ໮ٙࢤ࿁ࢤ࠽ߒމ

4.4Vc(C) ༈ཥᏀৃ໮ٙϞࣖ࠽ߒމ 3.1Vc(D) ༈ཥᏀৃ໮ٙ᎖

ଟމ 60Hzf Ch1 1.0V
༆ B M2.5ms A Ch1 1.2V

(A) ඄ಂ T = 2.5ms/DIV × 4DIV = 10ms

(B) ࢤ࠽ V = 1.0V/DIV × 2.2DIV = 2.2V
p
ࢤ࿁࿁࠽ V = 2V = 2 × 2.2 = 4.4V
p-p
p
(C) Ϟࣖ࠽ V = V p = 2.2V ≈ 1.56V
rms
2 1.414
1 1
(D) ᎖ଟ f = = = 100Hz
T 10 × 10 –3

範例 5

ধϞɓָ͍تڦ໮ v(t) = 4sin785t Ϳतdʔ຾সಯٜટ̋Ցͪ

تኜ಻ඎتҖ˲ʔԴ͜˥̻׳ɽᄣूdฆሜૅඐޫໄ׵͍ࣧ
ЗໄdتҖᜑͪνྡהͪdϤࣛՉૅඐ TIME/DIV ձ VOLTS/

DIV Ꮠʱй݊ʲ౬ίc(A) 1ms/DIVd2V/DIVc(B) 2ms/DIVd

1V/DIVc(C) 2ms/DIVd2V/DIVc(D) 2ms/DIVd5V/DIVf
༆ C

V
(1) ָ͍تڌͪό v(t) = V sin(ωt + θ) = 2 p-p sin(ωt + θ)
m
ה˸ָ͍تٙࢤ࿁ࢤ࠽ V = 2V = 2 × 4 = 8(V)
m
p-p
VOLTS 8V
ྡʕتҖࣈషϞ 4 ࣸd݂ = = 2V/DIVf
DIV 4 DIV
1 1
(2) ͟׵ ω = 785 = 2πfdה˸᎖ଟ f = 125(Hz)d඄ಂ T = = = 8(ms)
f 125

TIME 8ms
ྡʕتҖɓ඄ಂϞ 4 ˥̻ࣸd݂ = = 2ms/DIVf
DIV 4 DIV

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