On the Bridge Type Vacuum Tube Voltmeter

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The present paper is the description about a new type vacuum tube voltmeter, designed by the authors for the purpose of measuring very small alternating voltages.It consists of a balanced high resistance bridge, two symmetrically placed triode rectifiers, and a D'Arsonval type galvanometer.If a small voltage is applied to one corner, and an auxiliary voltage of the same frequency to another corner of the bridge as seen in Fig. 1, the galvanometer gives the deflection proportional to the scalar product of these two voltages.The voltage sensitivity of this voltmeter arrangement can be varied by choosing the auxiliary voltage in a wide range, the maximum sensitivity obtained by our experiment was 2.4mm for one millivolt with the auxiliary voltage of 8volts.The advantages of this arrangement are, the portability, the easy handling and the high sensitivity, and the inconvenience lies in the slight instability of the zero position of the galvanometer.This apparatus can be used conveniently, also for the very precise comparison of frequencies of high frequency current, the difference of even one tenth of a cycle may be detected by our method.
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