Measurement
485
• Different test fixtures must be fabricated for evaluating different
types of DUTs because they require different characteristic
impedances and matching circuits.
• An actual balun does not have ideal characteristics, so measurement
error cannot be avoided. Furthermore, a common mode signal
evaluation cannot be performed when an actual balun is used.
DUT Evaluation using E5071C's Fixture Simulator
The E5071C's fixture simulator function simulates a test fixture by using
internal software instead of using an actual test fixture for evaluating
DUTs.
The following figure shows an example connection for evaluating a DUT
with the E5071C's fixture simulator function. The unbalanced port of the
DUT should be directly connected to a test port of the E5071C, and the
balanced port of the DUT should be connected to two other test ports of
the E5071C. The actual measurement by the E5071C is performed at
single-ended ports with a 50 ohm port reference impedance.
DUT connection when fixture simulator is used
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