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The impedance limits must be known in order to correctly calibrate the system. In the above example, the Gain Factor calculated at the mid-point frequency of 31KHz can be used to calculate any impedance in the 180KΩ to 220Ω region. Impedance results will degrade if the unknown impedance span is large or if the frequency sweep is large. If any of the calibration system gain settings change, the user will need to recalibrate the AD5933 and recalculate the Gain Factor. (See the AD5933 datasheet for further details).
PTM Published on: 2007-09-17
Australia