Storage oscilloscopes, Electrical Engineering

Q. Write short note on storage oscilloscopes.

Sol. Storage Oscilloscope: The bistable storage tube is between two to ten times slower than a comparable variable persistence tube. However it is capable of much longer storage times, measured in hours rather in minutes as for variable persistence. The bistable tube is also capable of operating split screen mode, where half the screen has storage capability and the other half is a conventional and the other half is conventional phosphor tube.

    Unlike the variable persistence tube the same phosphor screen is used for both storage and display. The screen consists of p, phosphor, doped to have good secondary commission characteristics and deposited on a conductive backplane made from a transparent meta film. The phosphor layer consists of a thin coating of scattered particles, so as to give a discontinuo9us surface. This stops the boundary migration of stored charge. The thin phosphor coating also has a short life since it suffers from light output reduction with time.

   The conductive film is held at a low positive potential, so as to attract a cloud of low energy electrons from the flood gun. These electrons have insufficient energy to penetrate the phosphor and are gathered by the collimator. When the write gun is switched on, its high energy electrons result in secondary emission from areas traced on the screen, moving these to the upper stable point. The trace is therefore at a high positive potential and this is maintained due to the low leakage of the phosphor. The low energy electrons from the flood gun are now attracted to the positive areas of the screen and go through the phosphor to reach the metal film at the back. In passing through the phosphor they cause it to glow displaying the area traced out by the writing gun. The screen can be erased by setting the metal film to a negative voltage repelling the electrons back into the storage area and returning the phosphor to the low stable point.

 

 

Posted Date: 7/12/2012 6:36:04 AM | Location : United States







Related Discussions:- Storage oscilloscopes, Assignment Help, Ask Question on Storage oscilloscopes, Get Answer, Expert's Help, Storage oscilloscopes Discussions

Write discussion on Storage oscilloscopes
Your posts are moderated
Related Questions
Disinfection of water streams originating from potable water plants is key in protecting environmental health. Describe the process design and application, along with potential pro

Working of Hartley oscillator : When the collector supply voltage Vcc is switched on, the capictor gets charged. The capacitor discharges through the inductor, setting up oscil

The aim of this question is to help you become familiar with phasor diagrams, and in particular to see how the diagram changes when one of the system parameters (in this case resis

Production of Rotating Fields from Single-Phase Windings In this subsection we show that a single-phase winding carrying alternating current produces a stationary pulsating flu

A switch-mode power supply is to be designed with the following specifications: input voltage V s = 48 V ± 10%, output voltage V o = 5 V, switching frequency f s = 100 kHz, outp



Q. A three-phase, 50-Hz induction motor has a full load speed of 700 r/min and a no-load speed of 740 r/min. (a) How many poles does the machine have? (b) Find the slip and t

PNP The other kind of BJT is the PNP with the letters "P" and "N" standing for the majority charge carriers inside the dissimilar regions of the transistor. Figure:

Basic Operations of 8085 Microprocessor The 8085 microprocessor  performs followings  five  basic  operations . 1. Opcode Fetch :  Reading and decoding  operation code  of