Preliminary Technical Data
EVAL-AD5934EB
Rev. PrC | Page 13 of 32
data with 512 data points, starting at the start frequency value
and ending at the stop frequency value. The stop frequency
value is determined by
Start Frequency
+ (
Number of Increments
×
Delta Frequency
)
Graphs of the
impedance profile
vs. frequency and the phase profile
vs. frequency appear in the main dialog box of the evaluation
software after the sweep has completed. The user can switch
between the impedance (|Z|) profile and phase (Ø) profile by
clicking the corresponding tabs. The
Absolute Impedance |Z|
tab shows how the impedance being analyzed (Z
UNKNOWN
) varies
across the programmed frequency range. To view how the
phase varies across the network being analyzed, click the
Impedance Phase Ø
tab (see Figure 19).
05
44
9-
01
9
Figure 19. The
Impedance Phase Ø
Tab on the Main Dialog Box
(the Phase of a 200 kΩ Resistor (0°) Is Displayed)
Note that the phase measured by the AD5934 takes into account
the phase introduced through the
entire
signal path, that is, the
phase introduced through the output amplifiers, the receive I-V
amplifier, the low-pass filter, etc., along with the phase through
the impedance (ZØ) being analyzed, which is connected between
VOUT and VIN (Pin 6 and Pin 5 of the AD5934). The phase of the
system must be calibrated using a resistor before any subsequent
impedance phase (ZØ) measurement can be calculated. You need
to perform the calibration with a resistor in the evaluation
software in order to calibrate the system phase correctly. Refer
to the Impedance Measurement Tips section for more details.
FREQUENTLY ASKED QUESTIONS
ABOUT INSTALLATION
Q:
How can I confirm that the hardware has been installed
correctly in my computer?
A:
Right-click
My Computer
and then left-click
Properties
. On
the
Hardware
tab, click
Device Manager
.
0
54
49
-0
20
Figure 20. System Properties
Scroll to
Universal Serial Bus controllers
and expand the
directory root (see Figure 21). Figure 21 indicates what to
expect when the AD5934 evaluation board is installed correctly
and the evaluation board and USB cable are connected correctly
to the computer. The root directory is refreshed after the USB
cable is unplugged from the evaluation board, and then the
AD5934 evaluation kit icon is removed from the main root.
