. Electronic apparatus for biological research . Brightness control EHT- Figure scheme employing a neon lamp or potential divider. With electrostatic tubes, the +ve side of the EHT supply is at or near earth potential, and the grid is about 2 kV below earth. A possible method is to employ resistance-capacitance coupling, remember- ing that the capacitor must be rated to withstand the EHT voltage {Figure ). The technique is open to two serious objections: (1) The leakage resistance of C must be much greater than the resistance R, otherwise it will not be possible to suppress t
. Electronic apparatus for biological research . Brightness control EHT- Figure scheme employing a neon lamp or potential divider. With electrostatic tubes, the +ve side of the EHT supply is at or near earth potential, and the grid is about 2 kV below earth. A possible method is to employ resistance-capacitance coupling, remember- ing that the capacitor must be rated to withstand the EHT voltage {Figure ). The technique is open to two serious objections: (1) The leakage resistance of C must be much greater than the resistance R, otherwise it will not be possible to suppress the beam. This may restrict HT+
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