Oscilloscope

Delay Line Circuit

Delay Line Circuit: Figure 7.13 shows a Delay Line Circuit in Triggered Sweep Circuit. Figure 7.14 indicates the amplitude of the signal wrt time and the relative position of the sweep generator output signal. The diagram shows that when the delay line is not used, the initial part of the signal is lost and only …

Delay Line Circuit Read More »

Trigger Pulse Generator Circuit

Trigger Pulse Generator Circuit: The Trigger Pulse Generator Circuit is activated by signals of a variety of shapes and amplitudes, which are converted to trigger pulses of uniform amplitude for the precision sweep operation. If the trigger level is set too low, the trigger generator will not operate. On the other hand, if the level …

Trigger Pulse Generator Circuit Read More »

Triggered Sweep CRO

Triggered Sweep CRO: Triggered Sweep CRO – The continuous sweep is of limited use in displaying periodic signals of constant frequency and amplitude. When attempting to display voice or music signals, the pattern falls in and out of sync as the frequency and amplitude of the music varies resulting in an unstable display. A triggered …

Triggered Sweep CRO Read More »

Horizontal Deflecting System

Horizontal Deflecting System: The Horizontal Deflecting System consist of a Time Base Generator and an output amplifier. Sweep or Time Base Generator A continuous sweep CRO using a UJT as a time base generator is shown in Fig. 7.8. The UJT is used to produce the sweep. When the power is first applied, the UJT …

Horizontal Deflecting System Read More »

Vertical Amplifier

Vertical Amplifier: Vertical Amplifier – The sensitivity (gain) and frequency bandwidth (B.W.) response characteristics of the oscilloscope are mainly determined by the vertical amplifier. Since the gain B.W. product is constant, to obtain a greater sensitivity the B.W. is nar­rowed, or vice-versa. Some oscilloscopes give two alternatives, switching to a wide bandwidth position, and switching …

Vertical Amplifier Read More »

Block Diagram of CRO

Block Diagram of CRO: The Basic Block Diagram of CRO is shown in Fig.7.5. The ac filament supplies power to the CRT heaters in the Block Diagram of CRO. This also provides as accurate ac calibrating voltage. CRT dc voltage is obtained from the HV dc supply through voltage dividers. R1 — R5 Included along with …

Block Diagram of CRO Read More »

Block Diagram of Oscilloscope

Block Diagram of Oscilloscope: The major Block Diagram of Oscilloscope shown in Fig. 7.4, of a general purpose Oscilloscope, is as follows: CRT Vertical amplifier Delay line Time base Horizontal amplifier Trigger circuit Power Supply The function of the various blocks are as follows. CRT This is the cathode ray tube which emits electrons that …

Block Diagram of Oscilloscope Read More »

Sweep Generator

Sweep Generator: Principle of Sweep Generator:The amplitude of a voltage may be directly measured on a calibrated viewing screen from the length of the straight line trace it produces. This is entirely satisfactory for dc voltage. But the straight line tells little, or practically nothing, about the waveform of an ac voltage, pulsating voltage or …

Sweep Generator Read More »

CRT Features

CRT Features: CRT Features – Electrostatic CRTs are available in a number of types and sizes to suit individual requirements. The important features of these tubes are as follows. 1.Size Size refers to the screen diameter. CRTs for oscilloscopes are available in sizes of 1, 2, 3, 5, and 7 inches. 3 inches is most …

CRT Features Read More »

Electron Beam Experiment in CRT

Electron Beam Experiment in CRT: To understand the principle of an Electron Beam Experiment in CRT, let us consider a torch which is focused on a piece of cardboard (held perpendicular to the torch). The light beam will make a bright spot where it strikes the cardboard or screen. Hold the torch still, the spot …

Electron Beam Experiment in CRT Read More »