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EXAMPLE 24.3 Determine the pulse repetition frequency and the<br />

duty cycle for the periodic pulse waveform of Fig. 24.12.<br />

V b = 3 mV<br />

Solution:<br />

0<br />

v (mV)<br />

–10<br />

5 10 15 20 25 30<br />

FIG. 24.12<br />

Example 24.3.<br />

Solution:<br />

T � (15 � 6) ms � 9 ms<br />

1 1<br />

prf � � ����111.11 kHz<br />

T 9 ms<br />

tp (8 � 6)<br />

ms<br />

Duty cycle � � �100% �� � � 100%<br />

T<br />

9 ms<br />

2<br />

� � �100% � 22.22%<br />

9<br />

v<br />

Vertical sensitivity = 0.2 V/div.<br />

Horizontal sensitivity = 1 ms/div.<br />

FIG. 24.13<br />

Example 24.4.<br />

div.<br />

T � (3.2 div.)(1 ms/div.) � 3.2 ms<br />

tp � (0.8 div.)(1 ms/div.) � 0.8 ms<br />

1 1<br />

prf � � ���312.5 Hz<br />

T 3.2 ms<br />

t p<br />

0.8 ms<br />

Duty cycle � � �100% ���100% � 25%<br />

T<br />

3.2 ms<br />

PULSE REPETITION RATE AND DUTY CYCLE ⏐⏐⏐ 1099<br />

t<br />

t (ms)<br />

EXAMPLE 24.4 Determine the pulse repetition frequency and the<br />

duty cycle for the oscilloscope pattern of Fig. 24.13 having the indicated<br />

sensitivities.

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