Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1962-04
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HEWLETT-PACKARD
JOURNAL
T E C H N I C A L I N F O R M A T I O N F R O M T H E - h p - L A B O R A T O R I E S
Vol. 13, No. 8
SHED ALTO, CALIFORNIA HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA APRIL, 1962
A New 50 MC Oscilloscope
Based on an Advanced CRT Design
FIG. 1 below shows a major new oscilloscope CRT CONSTRUCTION
which has electrical and mechanical innova The new cathode-ray tube achieves its en
tions that promise to make it a standard for larged 6 cm vertical scan and high sensitivity
high-frequency oscilloscope applications. The together with other desirable features by
oscilloscope's electrical advances are funda means of a novel type of post-acceleration of
mental in that they are made possible by a new the electron beam. As shown in Fig. 2, there
cathode-ray tube which has been designed in is located between the deflection plates and the
the -hp- crt laboratory. The result is an oscil phosphor screen a thin spherical metal-gauze
loscope that operates from dc to 50 megacycles shield, a mesh, having extremely small aper
and does so with a substantial decrease in cir tures. The mesh is placed with its convex side
cuit complexity. The oscilloscope is one that toward the phosphor screen and serves to
has a 50%- increased vertical deflection of 6 terminate the lines of force from the post-
cm, has constancy of focus to the degree that accelerator field in a controllable way. The
no panel astigmatism control is necessary, and resulting field configuration permits the elec
has the versatility that results from using tron beam to be accelerated by a large factor
plug-ins for both the vertical and horizontal without the reduction in sensitivity or demag-
systems. nification of deflection that limits the per-
CENTRAL RAY OF DEFLECTION OF CENTRAL RAr
DEFLECTED BEAM OF BEAM
WITH MESH WITHOUT MESH -
LINES OF FORCE OF POST-
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