OMICRON Lab
7
Application Information
4
Application Information
The
B
‑
WIC and B
‑
SMC
test fixtures are designed to measure the impedance of passive components in
the frequency range from 1 Hz to 50 MHz in conjunction with the Bode 100 vector network analyzer.
4.1
Measurement Principle
B
‑
WIC and B
‑
SMC
contain a resistive measurement bridge with a voltage divider and a current shunt.
The measurement principle is a relative voltage / current method where CH1 receives a voltage signal
proportional to the voltage at the DUT and CH2 receives a voltage signal proportional to the current
flowing thru the DUT.
Figure 4-1:
Measurement principle of
B
‑
WIC and B
‑
SMC
Open / Short / Load calibration must be carried out to compensate for parasitic effects and non-ideal
behavior occurring at higher frequencies. To learn how to calibrate the
B
‑
WIC and B
‑
SMC
, please refer
to 4.4 Calibration / Correction on page 8.
4.2
Device Connection
The figure below shows the connection from Bode 100 to
B
‑
WIC and B
‑
SMC
. It is recommended to use
the 0.5 m long BNC cables delivered with the Bode 100 for the connection.
Figure 4-2:
Connecting
B
‑
WIC and B
‑
SMC
to the Bode 100 VNA
