NF FRA5087 - Fig. 3-17 Connection Diagram for Impedance Measurement

3.5 Examples of basic operations
FRA5087
3-32
 Impedance measurement
V2
V1
Zx
Current detection
resistance
Rs
+
+
+
Device under test
(DUT)
Power amplifier
(option)
Fig. 3-17 Connection diagram for impedance measurement
The current flowing through the DUT (device under test) can be measured as the voltage V
2
that is
detected by the current detection resistance Rs, and the voltage across the DUT can be measured
as V
1
as shown in the figure.
The DUT impedance Zx is obtained by the following equation:
2
1
2
1
/ V
VRs
RsV
V
i
v
Z
x







Set the analysis mode at (CH1/CH2) for the FRA5087, and also, set the CH2 input weighting
factor at 1/Rs (for 1.0Rs) to measure the DUT impedance characteristics and to display them as
the amplification gain on the LCD screen.
By using the impedance display function (option), the result can also be converted into impedance.
Refer to “5. Impedance display function (option)”.