Analog Devices EVAL-AD5933EBZ User Manual page 9

Evaluation Board User Guide
Each data entry corresponds to a single measurement
(frequency) point; therefore, if the value for the number of
increments is programmed as 511 point, the array contains
a single column of data with 512 data points, starting at the
start frequency and ending at stop frequency value, which
is determined by
Start Frequency + (Number of Increments × Delta
Frequency)
The impedance profile and phase profile vs. frequency appears
in the evaluation software front panel after the sweep has
completed. Click the individual tabs to switch between
Absolute Impedance |Z| and Impedance Phase Ø. Click
Absolute Impedance |Z| to show how the impedance under
analysis (Z ) varies across the programmed frequency
UNKNOWN
range. To view how the phase across the network under
analysis varies, click Impedance Phase Ø, as shown
in Figure 17.
Figure 17. The Phase Tab on the AD5933 Evaluation Software Front Panel, Phase of 200 kΩ Resistor (0°) Displayed
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Note that the phase measured by the
account the phase introduced through the entire signal path,
that is, the phase introduced through the output amplifiers,
receive current-to-voltage (I-V) amplifier, and the low-pass
filter, along with the phase through the impedance (Z
analysis connected between VOUT and VIN (Pin 6 and Pin 5
of the AD5933). Calibrate out the phase of the system using
a resistor before any subsequent impedance (Z
measurement is calculated. Calibrate with a resistor in the
evaluation software to calibrate the system phase correctly
(refer to the Impedance Measurement Tips section for
further details).
UG-364
AD5933 takes into
) under
Ø
) phase
Ø