the wave to be a rapid change in voltage or current, caused by
circuit components, which is followed after a certain interval by
another, similar change. This method analyzes the responses of a
circuit to a transient waveform.
Section II. FREQUENCYRESPONSE ANALYSIS AND TRANSIENT RESPONSE
a. Using the frequencyresponse method of analysis, a waveform
can be analyzed by determining the number, amplitude, frequency, and
phase of sine waves required to reproduce it. The rate at which a
frequency. If a waveform is repeated 1000 times per second, the
fundamental frequency is 1000 Hz (hertz per second). The second
harmonic of this waveform has a frequency equal to twice the
fundamental frequency of 2000 Hz, and the third harmonic of this
waveform has a frequency equal to three times that of the fundamental
frequency or 3000 Hz. After the harmonic frequencies have been
determined, reactance and frequency concepts can be applied to
determine various circuit responses.
b. An important factor to consider in the frequency response
method of analysis is the number of harmonics that must be included
in forming the waveshape. A helpful rule to remember is that the
maximum number of harmonics varies inversely with the width of the
pulse being formed. Therefore, the narrower the pulse width, the
greater the number of harmonics required to produce the pulse.
a. Originally, the term transient was used to describe what
occurred during the period immediately after a piece of equipment was
turned off or on, or after some unusual disturbance occurred in the
equipment. When nonsinusoidal voltages were introduced in electronic
equipment, it was found that the methods developed to study
transients could be applied to nonsinusoidal waveforms. The meaning
of transient was then expanded to include the effects of the
nonsinusoidal waveforms. Today, a transient is considered as any
brief change in voltage in a circuit followed, after a period, by a
similar change. Transient time is the period of time during which
this change occurs. Conversely, a steady state is a period when the
output pulse does not experience a change in voltage or current.
b. The transientresponse method of waveform analysis is used to
determine the response of a circuit to a transient waveform. Since
voltages are nonsinusoidal during the transient time, the study of
transients can be considered as the study of the response of a
circuit to nonsinusoidal voltages.