6-45
All other indicators off or inactive.
SUMMARY
Now that we have completed this chapter, we will briefly review the more important points covered.
A CATHODE-RAY TUBE (CRT) is used in an oscilloscope to display the waveforms.
The CRT used in oscilloscopes consists of an ELECTRON GUN, a DEFLECTION SYSTEM,
and a FLUORESCENT SCREEN.
The ELECTRON BEAM in an oscilloscope is allowed to be controlled in any direction by means
of HORIZONTAL- and VERTICAL-DEFLECTION PLATES.
VERTICAL-DEFLECTION PLATES are used to show AMPLITUDE of a signal.
HORIZONTAL-DEFLECTION PLATES are used to show TIME and/or FREQUENCY
relationship.
A GRATICULE is a calibrated scale of AMPLITUDE VERSUS TIME that is placed on the face
of the CRT.
A DUAL-TRACE OSCILLOSCOPE is designed to accept two vertical inputs at the same time. It
uses a single beam of electrons shared by two channels.
The SPECTRUM ANALYZER accepts an electrical input signal and displays the signal’s
frequency and amplitude on a CRT display.
ANSWERS TO QUESTIONS Q1. THROUGH Q18.
A-1. Control grid.
A-2. The first anode.
A-3. Because they bend electron streams in much the same manner that optical lenses bend light rays.
A-4. It accelerates the electrons emerging from the first anode.
A-5. A greater deflection angle.
A-6. A greater deflection angle.
A-7. Higher potential.
A-8. Slower beam.
A-9. Amplitude and time.
A-10. Amplitude.
A-11. Time and/or frequency relationships.
