. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. ALTERNATING-CURRENT SUSCEPTIBILITY METER 151 The indicating device consists of a pointer type, alternating-current galvanometer, energized by a three-stage, resistance-capacitance-coupled, vacuum-tube amplifier, which is provided with an appropriate output circuit that is designed to prevent the flow of direct current through the galvanom- eter circuit. The shunt rz permits critical damping of the galvanometer, and also furnishes a convenient means for adjusting its sensitivity. An ex- ternal storag
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. ALTERNATING-CURRENT SUSCEPTIBILITY METER 151 The indicating device consists of a pointer type, alternating-current galvanometer, energized by a three-stage, resistance-capacitance-coupled, vacuum-tube amplifier, which is provided with an appropriate output circuit that is designed to prevent the flow of direct current through the galvanom- eter circuit. The shunt rz permits critical damping of the galvanometer, and also furnishes a convenient means for adjusting its sensitivity. An ex- ternal storage battery, Bu supplies filament power for the amplifier, while the grid-bias battery, B2, and plate battery, B3, are included within the instru- ment Fig. 2. Electric circuits of the Susceptimeter. The switch 52 makes it possible to energize simultaneously the bridge and galvanometer field winding with 60-cycle alternating current, or 6-volt direct current, while S3 is for the purpose of connecting the galvanometer directly to the output junctions of the bridge, or including the amplifier in the in- dicator circuit. The switches 55 and S6 control the external alternating-cur- rent and direct-current power sources, respectively. Theory Let Ri and R2 be the resistances of the ratio arms; R3 the resistance of the arm containing the inductances Lx and L2; R\ the resistance of the arm con- taining the inductances L3 and L4; then, the condition imposed for a balance with direct current is RiR3 = R2Ri varying rB a balance can be obtained for steady currents. 19. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Society of Exploration Geophysicists. Tulsa
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