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
what are the limitations of superposition theroem

a) Illustrate the Schematic diagram of the Transformer Box used in the Practical Session b)  Calculate the output voltage on an Oscilloscope and determine its amplitude and freq

Q. explain the architecture of SS7 and compare with seven-layer OSI architecture. Ans: A block schematic diagram of CCITT no. 7 signalling system is displayed in figure. Sig

Q. In a depletion MOSFET for which V P = 3 V and I DSS = 11mA, the drain current is 3mA when v DS is set at the largest value that will maintain ohmic region operation. Find v G

Q. Define Power-Supply Rejection Ratio? An op amp's ability to disregard changes in power-supply voltage is measured by the power- supply rejection ratio (PSRR), which is speci


Explain Total internal reflection? The refractive index of a medium is defined as the ratio of velocity of light in vacuum to the velocity of light in that medium n x = C/V

Q. (a) Show by applying Ampere's circuital law that themagnetic field associated with a long straight, current-carrying wire is given by B φ = µ 0 I/(2πr), where the subscript φ d

Q. Use (a) mesh analysis and (b) nodal analysis to determine the current through the 4-resistor of the circuit of Figure.

Q. For a transmission-line model that includes only the series impedance Z, sketch phasor diagrams for: (a) Lagging power factor load. (b) Leading power factor load.