1. Introduction
... of its simple and rugged construction and minimal need of maintenance. Its efficiency is good and the weight low. It has internationally standardised dimensions and power ratings. Its popularity and good characteristics have also made it cost-effective. Before frequency converters were introduced in ...
... of its simple and rugged construction and minimal need of maintenance. Its efficiency is good and the weight low. It has internationally standardised dimensions and power ratings. Its popularity and good characteristics have also made it cost-effective. Before frequency converters were introduced in ...
Chapter 12 Supporting 4-3
... limit of emission. In this trans-space charge region, electrons are emitted as a coherent stream of fluid having number densities equal to that of the conductor lattice template, being in the region of Avogadro’s number. The fluid-like properties of this emergent stream, along with incidental electr ...
... limit of emission. In this trans-space charge region, electrons are emitted as a coherent stream of fluid having number densities equal to that of the conductor lattice template, being in the region of Avogadro’s number. The fluid-like properties of this emergent stream, along with incidental electr ...
ppt - EC - Unit 6 - sine wave -1
... • This is achieved by “varicap”, whose capacitance varies with applied voltage. • Varicap is used in tank circuit, which determines frequency ...
... • This is achieved by “varicap”, whose capacitance varies with applied voltage. • Varicap is used in tank circuit, which determines frequency ...
Sencore Blows Away CRT Failures With CR7000
... G1 shorts also result in CRTs that cannot be controlled by the brightness control or the incoming video or blanking signals. The CR7000 "REMOVE G1 SHORT" function will vaporize most shorting particles, resulting in normal CRT operation. CUTOFF RELATED FAILURES In order to understand the cutoff test, ...
... G1 shorts also result in CRTs that cannot be controlled by the brightness control or the incoming video or blanking signals. The CR7000 "REMOVE G1 SHORT" function will vaporize most shorting particles, resulting in normal CRT operation. CUTOFF RELATED FAILURES In order to understand the cutoff test, ...
chapter 11 - Nutley Public Schools
... • However, when electrons reach the filament, its resistance is so great that the electric energy is converted into heat and light energy. • The force opposing the flow of electrons through • the filament is called resistance. • Good conductors have low resistance. • Poor conductors, called resistor ...
... • However, when electrons reach the filament, its resistance is so great that the electric energy is converted into heat and light energy. • The force opposing the flow of electrons through • the filament is called resistance. • Good conductors have low resistance. • Poor conductors, called resistor ...
Paper - Indico
... operation, the light signals (fiber optics) are used for control and communicate to other external system. Fiber optics signal has provided the isolation between high voltage and low level control. This 65 kV supply is floating on cathode voltage (-100kV). This floated supply has been tested up to 1 ...
... operation, the light signals (fiber optics) are used for control and communicate to other external system. Fiber optics signal has provided the isolation between high voltage and low level control. This 65 kV supply is floating on cathode voltage (-100kV). This floated supply has been tested up to 1 ...
CRO notes(8th Unit)
... Figure shows the basic construction of a CRT. We will first consider the device’s basic operation. A control grid (G) provides for control of the number of electrons passing farther into the tube. A voltage on the control grid determines how many of the electrons freed by heating are allowed to cont ...
... Figure shows the basic construction of a CRT. We will first consider the device’s basic operation. A control grid (G) provides for control of the number of electrons passing farther into the tube. A voltage on the control grid determines how many of the electrons freed by heating are allowed to cont ...
Physics Items - Memphis Radiological
... variation of resonance frequencies under the influence of an external magnetic gradient over a specific field of view. This results in a net range of precessional frequencies across the field of view, which is sampled according to the matrix size. If the gradient strength is low, that means that a s ...
... variation of resonance frequencies under the influence of an external magnetic gradient over a specific field of view. This results in a net range of precessional frequencies across the field of view, which is sampled according to the matrix size. If the gradient strength is low, that means that a s ...
Investigation of Hot Cathode and Hollow Anode of Argon Glow
... The detail of a gas discharge by a hot filament cathode has been studied by many researchers, Ehlers and Leung (1979) had investigated the electron emission from filament cathodes in gas discharge, and shown magnetic field produced by the filament heating current cause inhomogeneous emission of elec ...
... The detail of a gas discharge by a hot filament cathode has been studied by many researchers, Ehlers and Leung (1979) had investigated the electron emission from filament cathodes in gas discharge, and shown magnetic field produced by the filament heating current cause inhomogeneous emission of elec ...
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron and traveling-wave tube (TWT), the magnetron cannot function as an amplifier, increasing the power of an applied microwave signal, it serves solely as an oscillator, generating a microwave signal from direct current power supplied to the tube.The first form of magnetron tube, the split-anode magnetron, was invented by Albert Hull in 1920, but it wasn't capable of high frequencies and was little used. Similar devices were experimented with by many teams through the 1920s and 30s. On November 27, 1935, Hans Erich Hollmann applied for a patent for the first multiple cavities magnetron, which he received on July 12, 1938, but the more stable klystron was preferred for most German radars during World War II. The cavity magnetron tube was later improved by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from their device made centimeter-band radar practical for the Allies of World War II, with shorter wavelength radars allowing detection of smaller objects from smaller antennas. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships.In the post-war era the magnetron became less widely used in the radar role. This was because the magnetron's output changes from pulse to pulse, both in frequency and phase. This makes the signal unsuitable for pulse-to-pulse comparisons, which is widely used for detecting and removing ""clutter"" from the radar display. The magnetron remains in use in some radars, but has become much more common as a low-cost microwave source for microwave ovens. In this form, approximately one billion magnetrons are in use today.