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Q3 (15 marks)

a)

Examine the OpenChoice screenshot in figure Q3a, using the volts per division method,

calculate the amplitude of both waveforms. Using the time per division method, calculate

the frequency of both waveforms. (6 marks)

200mV

200mV

2 1V

1V

M 50ms

Figure Q3a. A screenshot of two sinusoidal waveforms using a DSO.

Ton

M.Pos: 0.000s

M 50ms

Measure

Measure

Gating

On Off

Ch1

Ch2

Math

SnapShot

SnapShot

Figure Q3a. A screenshot of two sinusoidal waveforms using a DSO.

b) Examine the waveform in Q3b. This image shows a PWM waveform. Calculate the duty cycle

of the waveform when V+ is 9 volts, Ton is 5 ms and Toff is 20 ms. Include all workings. (4

marks)/nToff

Figure Q3. PWM waveform

c) Examine the circuit in Q3c. This image shows a passive bacdstop/notch filter. What is the

Cut-Off/Centre Frequency and the Bandwidth when R1 is 1 K L1 is 50 mt and C1 is 1 of

Include all calculations. (5 marks)

C1

Figure Q3b. PWM waveform

R1

OV

c) Examine the circuit in Q3c. This image shows a passive bandstop/notch filter. What is the

Cut-Off/Centre Frequency and the Bandwidth when R1 is 1 KG, L1 is 50 mH and C1 is 1 p

Include all calculations. (5 marks)

H

C1

GND

Figure Q3c. A passive bandstop/notch filter

Fig: 1

Fig: 2