Electronic apparatus for biological research Electronic apparatus for biological research . electronicappara00dona Year: 1958 HARD VALVES that some 'high tension' is always applied to the valve. If the HT is absent or if the heater voltage is too lovv' then the cathode is liable to be 'poisoned' and its emission fail. If the HT is too high, exceeds the upper limit set by the manufacturers, the power dissipated in the valve will be excessive and the anode will overheat; when this happens there is a risk of the liberation of absorbed gas and consequent cathode destruction by ionic bombardm
Electronic apparatus for biological research Electronic apparatus for biological research . electronicappara00dona Year: 1958 HARD VALVES that some 'high tension' is always applied to the valve. If the HT is absent or if the heater voltage is too lovv' then the cathode is liable to be 'poisoned' and its emission fail. If the HT is too high, exceeds the upper limit set by the manufacturers, the power dissipated in the valve will be excessive and the anode will overheat; when this happens there is a risk of the liberation of absorbed gas and consequent cathode destruction by ionic bombardment. If the heater voltage is excessive the cathode will overheat and the valve will fail from premature evaporation of the barium and strontium oxides de- posited on it. DIODE If a hard diode current be measured as a function of the potential applied to the anode {Figure ), the resulting relationship is of the form shown in Figure The portions of the curve AB, BC, and CD represent three distinct regimes: AB. Here the anode is negative with respect to the cathode, and electrons A B C^ D
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