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Unit 9

Unit 9. Oscilloscopes. Objectives After completing this chapter, the student should be able to: Explain the function of an oscilloscope. Identify the basic parts of an oscilloscope and explain their functions. Demonstrate the proper setup of an oscilloscope.

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Unit 9

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  1. Unit 9 Oscilloscopes

  2. Objectives • After completing this chapter, the student should be able to: • Explain the function of an oscilloscope. • Identify the basic parts of an oscilloscope and explain their functions. • Demonstrate the proper setup of an oscilloscope. • Describe how to use an oscilloscope to make a measurement.

  3. Oscilloscopes • Most versatile piece of test equipment available for working on electronic equipment and circuits. • Provides a visual display of what is occurring in the circuit.

  4. Oscilloscopes provide: • The frequency of a signal. • The duration of a signal. • The phase relationship between signal waveforms. • The shape of a signal’s waveform. • The amplitude of a signal.

  5. The basic parts of an oscilloscope are: A cathode ray tube (CRT). A sweep generator. Horizontal and vertical deflection amplifiers. Power supplies.

  6. Cathode-ray tube (CRT) A phosphor screen. Deflection plates. An electron gun.

  7. Faceplate • Marked in centimeters along the vertical and horizontal axis. • Can be calibrated with a known voltage before testing an unknown signal. • Called a graticule, and is separate from the oscilloscope. • Mounted in front of the CRT.

  8. Power switch • Usually on the front panel. • May be a toggle, push-button or rotary switch. • Mounted separately or with another switch. • Used to apply line voltage to operate the oscilloscope.

  9. Intensity switch • Also called brightness. • Controls the electron beam within the CRT. • It is a rotary control. • Too much intensity for too long can burn a hole or etch a line in the phosphor screen.

  10. Focus and astigmatism controls • Connected to the electron gun. • Used to adjust the electron beam size and shape. • Rotary controls.

  11. Horizontal and vertical position controls • Rotary controls. • Allows the electron beam to be positioned anywhere on the face of the CRT.

  12. Horizontal block • Consists of: • A vertical input jack. • An AC/DC switch. • A volts/cm rotary switch. • The oscilloscope probe is connected to the input jack. • The probe is then connected to the circuit to be tested.

  13. Horizontal block • Also called the time base. • Consists of: • A time/cm rotary switch. • A trigger-control switch. • A triggering level control.

  14. Level control • Sets the amplitude that the triggering signal must exceed before the sweep generator starts. • Initial oscilloscope control settings: • Intensity: set to the center of range. • Focus: set to the center of range. • Astigmatism: set to the center of range. • Position: set to the center of range.

  15. Triggering: INT + • Level: AUTO • Tine/cm: 1 msec • Volts/cm: 0.02 • Power: ON

  16. In Summary • An oscilloscope provides: • Frequency of the signal. • Duration of the signal. • Phase relationships between signal waveforms. • Shape of the signal’s waveform. • Amplitude of the signal

  17. The basic parts of an oscilloscope are: • Cathode-ray tube (CRT). • Sweep generator. • Horizontal deflection amplifier. • Vertical deflection amplifier. • Power supply.

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