. Electronic apparatus for biological research . Figure electron is (K^ . e)ld, producing an acceleration (Fp . e)ldm. The accelera- tion acts for a time t, during which the electron is between the plates; but t = Ijva. The lateral velocity which the electron attains is acceleration X time d .m .Va lateral velocity Vn-e â I ~ axial velocity d .m .v^ ^.^ = ^â â« \ '''> i but 2-V^/d It follows from the above that: (1) For a given deflection angle, a long tube produces a bigger deflection per unit deflector plate potential differenceâ is more sensitiveâthan a short one. (2) For g
. Electronic apparatus for biological research . Figure electron is (K^ . e)ld, producing an acceleration (Fp . e)ldm. The accelera- tion acts for a time t, during which the electron is between the plates; but t = Ijva. The lateral velocity which the electron attains is acceleration X time d .m .Va lateral velocity Vn-e â I ~ axial velocity d .m .v^ ^.^ = ^â â« \ '''> i but 2-V^/d It follows from the above that: (1) For a given deflection angle, a long tube produces a bigger deflection per unit deflector plate potential differenceâ is more sensitiveâthan a short one. (2) For good sensitivity the deflector plates should be long, or close together, or both. In either case it is clear from the geometry that the maximum possible deflection angle is severely limited by the beam striking one or other deflector plate. Hence, electrostatic cathode ray tubes have to be long in relation to their screen diameter. (3) For good sensitivity the EHT should be the lowest possible consistent with securing a spot of adequate brightness and focus. The maker's figure for cathode ray sensitivity is given in the form say, 800/ F^^ mm/V, meaning 454
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