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The technique described uses a series of impedance measurements with different lead combinations and a calculation to determine the impedance of an unknown in the presence of lead and loading impedances. In general, a four-terminal ac or dc measurement requires four leads, four switches, and a series of five two-terminal measurements. However, an ac bridge is shown that requires only two switches...
A new instrument has been developed which displays simultaneously on two meters the difference in magnitude and phase angle between an unknown and a standard impedance. These impedances may be resistors, capacitors, inductors, or any complex impedance. No balancing operation is used, but instead the vector components of the bridge unbalance voltage are measured and displayed independently.
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