The electron microscope, its development, present performance and future possibilities electronmicrosco00gabo Year: 1948 n The Electron Microscope and of the constants of the circuit components. Spontaneous high frequency noise is of relatively very small importance; it is mostly suppressed by the capacity of the coaxial cable which connects the high voltage supply with the microscope. Ripple voltage in the microscope is enormously re- duced by supplying the rectifiers with 32,000 cycles, instead of with the line frequency. This artifice was known in high speed cathode ray oscillograp
The electron microscope, its development, present performance and future possibilities electronmicrosco00gabo Year: 1948 n The Electron Microscope and of the constants of the circuit components. Spontaneous high frequency noise is of relatively very small importance; it is mostly suppressed by the capacity of the coaxial cable which connects the high voltage supply with the microscope. Ripple voltage in the microscope is enormously re- duced by supplying the rectifiers with 32,000 cycles, instead of with the line frequency. This artifice was known in high speed cathode ray oscillography (Schering), but in electron micro- scopy, it has additional advantages. Not only can the ripple suppressing condenser be made much smaller, but it is much easier to shield the microscope from stray fields. In addition, the voltage regulator will work very much faster. I RectiFien -h Oscillator W77' 'T/m 6 '• 6 Line Fig. 21
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