1. Transient signals EE 2303

2. Overview What is a TRANSIENT Signal ??? What is a TRANSIENT Signal ??? Recap Of OSCILLOSCOPE Recap Of OSCILLOSCOPE Switches and Terminology Switches and Terminology Review Of Logic gates Review Of Logic gates Flip-Flop and Latches Flip-Flop and Latches

3. What is a Transient Signal???  Signals which last for a very short period of time are referred to as “ TRANSIENT Signals”.  Examples: Switch bounce, Shock wave generated from an impact test, Seismic Signals..

4. Run Control Menu Run/Stop (Green): Instrument is continuously acquiring data Run/Stop (Green): Instrument is continuously acquiring data Run/Stop (Red): Instrument has stopped 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) SINGLE : Instrument will wait for the user defined event (typically voltage set by the user)

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

6. Triggering modes Normal mode: Displays a waveform when the trigger conditions are met. Used for very short signals (*****) 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 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 Auto-level mode: can be used only when EDGE is selected on the front panel

7. Coupling Modes DC Coupling : Allows both D.C. and A.C. signal to flow in to the trigger path. DC Coupling : Allows both D.C. and A.C. signal to flow in to the trigger path. AC coupling : Allows A.C only AC coupling : Allows A.C only

8. SWITCHES & LOGIC GATES

9. Switches and Related Terminology Pole - number of switch contact sets. Pole - number of switch contact sets. Throw - number of conducting positions, single or double. Throw - number of conducting positions, single or double. Way - number of conducting positions, three or more. Way - number of conducting positions, three or more. Open - off position, contacts not conducting. Open - off position, contacts not conducting. Closed - on position, contacts conducting, there may be several on positions. Closed - on position, contacts conducting, there may be several on positions.

10. Single pole Double Throw Switch (SPDT-Switch) SPDT can be “ON” in both positions, switching on a separate device in each case. It is often called a “change over switch”.

11. Basic Logic Gates

12. Flip-Flops and Latches Flip-Flop and Latches are sequential circuits which are built from basic logic gates. Flip-Flop and Latches are sequential circuits which are built from basic logic gates. Flip-Flop and latches form the fundamental unit of “memory” in modern computers. Flip-Flop and latches form the fundamental unit of “memory” in modern computers. Each flip-flop can store 1 bit of information. Each flip-flop can store 1 bit of information.

13. Basic Idea Of the Experiment VOLTAGE SOURCE VOLTAGE SOURCE View transient Remove transien t

14. Pre-Lab Circuit ???