示波器原理与使用(国外英文资料).docVIP

示波器原理与使用(国外英文资料) In digital circuit experiments, several instruments and instruments are needed to observe the experimental phenomena and results. Commonly used electronic measuring instruments are multimeter, logic pen, ordinary oscilloscope, storage oscilloscope, logic analyzer and so on. The use of multimeter and logic pen is relatively simple, but logic analyzer and storage oscilloscope are not widely used in the teaching experiment of digital circuit. Oscilloscope is a widely used and relatively complex instrument. This chapter introduces the principle and operation method of oscilloscope from the point of view of use. ?? 1 oscilloscope working principle ?? An oscilloscope is an electronic measuring instrument that uses an electron oscilloscope tube to convert alternating electrical signals that cannot be observed directly by the human eye into images, which are displayed on a fluorescent screen for measurement. It is an important instrument for observing the phenomena of digital circuit experiment, analyzing the problems in experiment and measuring the result of experiment. The oscilloscope consists of oscilloscope tube and power supply system, synchronization system, X axis deflection system, Y axis deflection system, delay scanning system, and standard signal source. 1.1 oscilloscope tubes? Cathode ray tubes (CRT), referred to as oscilloscope tubes, are the core of an oscilloscope. It converts an electrical signal into an optical signal. As shown in Fig. 1, the three part of the electron gun, deflection system and phosphor screen is sealed in a vacuum glass shell to form a complete oscilloscope tube. ?? ?? ?? Fig. 1 the internal structure and power supply diagram of the oscilloscope tube ?? 1. fluorescent screen? Now, the oscilloscope tube surface is usually a rectangular plane, and a phosphor layer is deposited on the inner surface to form a fluorescent film. A layer of evaporated aluminum film is often added to the fluorescent film. High speed electrons pa