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Time Varying Signals
DC and AC Signal
DC Signal: constant
currents and voltages
AC Signal: time-varying
currents and voltages
Sinusoid Signal
A- Peak value
B- Peak to Peak
Value
C- Time period
Mathematical Representation
Sinusoid = A + B cos (t + )
Where
A – DC offset
B – Amplitude
=2f where f is frequency of sinusoid
 = phase shift
A.C. Signal Analysis
FUNCTION GENERATOR
(Equivalent to Power supply)
 OSCILLOSCOPE
(Equivalent to Multi-meter)

FUNCTION GENERATOR
FUNCTION GENERATOR
Things to Remember



Function – Select between Sinusoid, Square and
Triangle wave.
Frequency Range- Allows you to select
Frequency of the wave.
Amplitude – Allows you to set the amplitude
of the wave
Display Of Signal - Oscilloscope
DISPLAY
Front
Panel
Front Panel Of Oscilloscope
Acquiring
Signal
User set
Condition
Run Control Menu



Run/Stop (Green): Instrument
is continuously acquiring data
Run/Stop (Red): Instrument
has stopped Acquiring data
SINGLE : Instrument will wait
for the user defined event
(typically voltage set by the
user)
Trigger Menu
Trigger tells the oscilloscope when to start
acquiring data. Normally edge triggering is done
Triggering modes



Normal mode: Displays a waveform when the
trigger conditions are met. Used for very short
signals
Auto mode: Displays a waveform when the
trigger conditions are met. Used for all signals
Auto-level mode: can be used only when EDGE
is selected on the front panel
Coupling Modes
 DC
Coupling : Allows both D.C. and
A.C. signal to flow in to the trigger
path.
 AC coupling : Allows A.C only
Horizontal & Vertical Adjustments
A
A & B:
Horizontal
Controls
C & D:
Vertical
Controls
C
B
D
QUIZ – NEXT WEEK
( BASED ON OSCILLOSCOPE)
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