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RLC_BRIDGE

2016-05-14 18:40  
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RLC_BRIDGE
Maxwell bridge uses only one re-active element for measuring resistance, inductance, and capacitance. Wagner ground balances stray internal capacitances to ground to obtain perfect null. Measurement ranges are shown in table. 0ver fixed range, RA can be calibrated to read inductance values directly. RA and RB can be calibrated initially over their variable ranges by using standard resistors. Measurements are not affected by frequency of driving source. Circuit is set up as shown for measuring inductance. If standard inductance is used in place of Lx, unknown capacitor at CB can be measured. Signetics NE555 is connected as astable oscillator running at about 1000 Hz with values shown for R and C, drawing 6.5 mA from 9-V battery. Article covers construction and calibration and gives balance equations for all measurements.-J. Ii. Ellison, Universal L, C, R Bridge, Ham Radio, April 1976, p 54-55.