![]() Pieplow, H., Messgenauigkeit und Messgrenzen technischer Elektronenstrahloszillographen, ATM. Pieplow, H., Entwicklung und Aufgaben der Elektronenstrahl-Oszillografischen Messtechnik, Jahrbuch der AEG-Forschung, Vol. ![]() I., Elektronenoptik, Berlin, VEB Verlag Technik 1964, 182 pp, 155 illustrations.įeinberg, R., A high speed oscillograph cathode-ray tube for the direct recording of high current transients, Electronic Engineering, December 1956, pp 540-541, 6 illustrations. London, George Newnes Ltd., 1954, 213 pp, 120 illustrations. 1950, Berlin, Technischer Verlag Herbert Cram, 145 pp, 172 illustrations. Weyres, Th., Grundlagen der Kathodenstrahlröhren, 2 Aufl. Electronic Engineering, December 1955, pp 523-528, 2 illustrations. A., The electron gun of the cathode-ray tube. ![]() P., Control of the beam intensity in cathode ray tubes, Philips Tech. To all frequencies up to the high-range radio frequencies at which the time of one cycle is comparable to the transit time of the electron between the cathode and the fluorescent screen.Ĭathode-ray oscilloscopes are usually equipped with suitable preamplifiers for the deflector circuits, so that input voltages of low magnitude may be analyzed satisfactorily.Von Ardenne, M., Über eine indirekt geheizte Kathode für Braunsche Röhren, Fernsehen u. The Duddell type of oscillograph is satisfactory for frequencies up to about 5000 cycles per second, but the cathode-ray oscilloscope is applicable Electrostatic deflection has the advantage that practically no power is required, and the auxiliary circuits are simpler than those required for electromagnetic deflection. However, the magnetic-deflection principle, because of the lag of current caused by inductance in the coils, is not suitable for voltage measurements, but is confined to the sweep axis. Because of greater simplicity in the construction of magnetic-deflection tubes, they are cheaper than electrostatic-deflection tubes. Most of the electron acceleration is accomplished by the potential on anode A 2.ĭeflection of the beam is sometimes accomplished magnetically instead of electrostatically. The focusing of the beam is controlled by P 2. The structure of the grid and the aperture in anode AI are so designed as to prevent passage of all electrons which tend to stray from the desired beam path. 28-23 the grid G is used to control the beam or ray density, and hence the brightness of the luminous spot is controlled by changing P 1. In order to make use of the full width of the screen, there is usually maintained on the horizontal deflectors a constant voltage called a "pedestal" voltage which is just great enough to deflect the static spot to one side of the screen. It is important to note that the wave trace is accurate only in the center portion of the screen and is distorted on both ends. ![]() 28-23 is shown a screen trace that would be obtained by energizing deflection plates a by a sinusoidal voltage. The voltage to be analyzed is impressed across deflection plates a, which deflect the ray vertically in proportion to the magnitude of the voltage. Such a sweep of the spot on the screen provides a time axis on which to superpose the magnitude function of any voltage wave to be investigated as to shape. The frequency with which the sweeps are repeated is determined by the setting of the relaxation oscillator or an equivalent device. 28-3, be impressed on deflecting plates b, the beam will be deflected by the electrostatic charge on the plates and will be caused to sweep horizontally at uniform velocity across the screen and then to snap back quickly. If, however, a saw-toothed voltage function, such as shown in Fig. If deflecting electrodes a and b are not energized, the spot of light on the fluorescent screen caused by the striking of the electron ray will be in the center of the screen. High potentials on anodes A 1 and A 2 accelerate the freed electrons and focus some of them into a thin beam or ray as they pass through the anodes to bombard the fluorescent screen. 28-23 the electrons are boiled off into a cloud around the cathode C, which is indirectly heated from the filament. Fundamental Circuit of Cathode-Ray Oscilloscope 28-23 shows the construction, schematically, of a cathode-ray tube and its accompanying control circuits.įig. In the cathode-ray type, however, the visible trace is produced on the large end of a funnel-shaped tube, the end of which isĬoated with a fluorescent material. The cathode-ray oscillograph or oscilloscope is a device for observing high-speed phenomena in electrical circuits, and operates very much like the magnetic Duddell type described on page 188.
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