Exp 6

Electric lab

: Objective introduction to AC signal -1 . a- compare DC signal and AC signal . b-parameter AC signal .c-function generator .d-operation of oscilloscope .voltage difference measurement-2 .time constant measurement-3

: Theory DC signal Constant voltage

Frequency =zero : AC signal Frequency :how many times the signal repeat it )self in the time unit f=1/T (c/s) or (Hz Vpp=2Vp Exist the many from the wave form such as sinusoidal and square …etc

1

Electric lab

Effective value Veff=Vrms=Vp/

(sinusoidal only bout the any wave

. change is different Cycle period =Ton/Ttotal

:)result and digrams(data of table :

table 1

:table 1 Input frequency

Measured quantity Calculated )frequency(Hz

)Hz(

)Period (m-sec

1000

1

1000

2000

0.5

2000

3000

0.33

3030

4000

0.25

4000

5000

0.02

5000

:Table 2 Input signal )(effective

Measured quantity

)Level (v

Peak value )(Vp

Peak to peak value )(Vpp)(V

Effective )value (Veff

Calculated effective value )(V

1

1.414213

2.828426

1.4

0.989

2

2.828426

5.656852

2.72

1.923

3

4.242639

8.485278

4.5

2.999

4

5.656852

11.3137

5.2

3.676

5

7.071

14.142

7

4.949

1

Electric lab

: Calculation F=1/T F=1/0.5 ms=2000Hz *Vp=Veff Vp=2*1.414=2.828 v Vpp=2*Vp=2*2.828=5.656 v

: Conclusions exist large different between the AC signal and -1 .DC signal effective value is different between the signals-2 such as the sinusoidal Veff=Vp/

but the square

/signal Veff=Vp the function generator measure the peak value-3 . and we put the frequency value .the digital multemeterwe can measure the Vrms-4 .the oscilloscope output the wave form signal-5

1