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Impedance Measurements for Engineers
Impedance is measured using a variety of techniques. A particular technique is selected according to the test frequency, the impedance parameter to be measured and the preferred display parameters
The Auto-Balancing Bridge technique is exceptionally accurate over a broad impedance range (mΩ to the order of 100 MΩ). The frequency range this technique can be applied to is from a few Hz to 110 MHz.
The IV and RF-IV techniques are also very accurate over a broad impedance range (mΩ to MΩ). These techniques can be applied from 40 Hz to 3 GHz.
The Transmission/Reflection technique is applied over the broadest frequency range (5 Hz to 110 GHz). This technique delivers exceptional accuracy near 50 Ω or 75 Ω.
LCR meters and impedance analyzers are differentiated primarily by display properties. An LCR meter displays numeric data, while an impedance analyzer can display data in either numeric or graphic formats.
The techniques employed by these instruments are independent of analyzer type, and can be RF-IV, IV or Auto-Balancing Bridge (depending on frequency).
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