MEASURING INSTRUMENT FOR FINE VARIATION IN RESISTANCE AND CAPACITY OF ULTRALOW IMPEDANCE AND ABSOLUTE VALUE OF RESISTANCE AND CAPACITY

摘要

PURPOSE:To make it possible to measure resistance and capacity of ultralow impedance by electrostatically coupling a parallel tuning circuit under the same conditions to the output tank circuit of a high-frequency electric power source and by maximizing the resistance, a loss of capacity and the indication of phase discrimination. CONSTITUTION:From the high-voltage terminal of output tank circuit L0-C0 of the high-frequency electric power source, parallel tuning circuits L1-C1V-C1-C2, L1'-C1V and C1'-C2' which have entirely equal structure and constants are electrostatically coupled through capacities C01 and C01'. To C2 of the series circuit of C1 and C2, ultralow impedance samples RX and CX are connected in parallel through L1-Ci. For the purpose, ratio C2/C1 is fixed by sample resistance RX, so that resistance RPX= (1+C2/C)2XRX proportional to inherent parallel resistance R1 of the tuning circuit will be one half R1, and setting C01 to a fixed value makes it possible to obtain the maximum output of constant DELTARX/RX so that a minute change in resistance of the ultralow impedance can be measured with high precision. In this constitution, the minute variation in capacity, resistance and capacity, etc., can be measured.