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Time Varying Signals

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

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Time Varying Signals

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  1. Time Varying Signals

  2. DC and AC Signal DC Signal: constant currents and voltages AC Signal: time-varying currents and voltages

  3. Sinusoid Signal A- Peak value B- Peak to Peak Value C- Time period

  4. Mathematical Representation Sinusoid = A + B cos (t + ) Where A – DC offset B – Amplitude =2f where f is frequency of sinusoid  = phase shift

  5. A.C. Signal Analysis • FUNCTION GENERATOR (Equivalent to Power supply) • OSCILLOSCOPE (Equivalent to Multi-meter)

  6. FUNCTION GENERATOR

  7. FUNCTION GENERATOR

  8. 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

  9. Display Of Signal - Oscilloscope DISPLAY Front Panel

  10. Front Panel Of Oscilloscope Acquiring Signal User set Condition

  11. 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)

  12. Trigger Menu Trigger tells the oscilloscope when to start acquiring data. Normally edge triggering is done

  13. 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

  14. 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

  15. Horizontal & Vertical Adjustments A B A & B : Horizontal Controls C & D: Vertical Controls C D

  16. QUIZ – NEXT WEEK ( BASED ON OSCILLOSCOPE)

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