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Optimizing Measurements
Reducing Mismatch Errors
Reducing
Mismatch
Errors
in
a
Transmission
Measurement
Source match errors in transmission measurements can be reduced by
performing an enhanced response calibration. (See Chapter 6.) Load
match errors can be reduced by using an attenuator on the analyzer’s
TRANSMISSION RF IN port.
NOTE
Always use high quality attenuators. Six to ten
dl3
of attenuation should be sufficient to significantly
reduce mismatch errors.
Reducing
Mismatch
Errors
When
Measuring
Both
Reflection
and
Transmission
When you want to measure reflection and transmission simultaneously, or
without changing the test setup, perform both a reflection calibration and an
enhanced response calibration using the exact frequency parameters that you
will
be using for the measurement, and put a 6 to 10
dB
pad directly on the
output of the DUT.
-1
NOTE
Using an attenuator on the output of the OUT will reduce the system dynamic range.
5-18
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