Reducing Mismatch Errors When Measuring Both Reflection And Transmission - HP 8712ES User Manual

Optimizing Measurements
Reducing 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 a two-port calibration.
Though not as accurate as a two-port calibration, both a one-port
calibration for reflection and an enhanced response calibration for
transmission can be performed using the exact frequency parameters
that you will be using for the measurement. With this calibration choice,
it is recommended that you put a 6 to 10 dB pad directly on the output of
the DUT to improve measurement accuracy. Using both a one-port
calibration and an enhanced response calibration offers the advantage of
faster measurement speeds than when using a two-port calibration.
NOTE Using an attenuator on the output of the DUT will reduce the system
dynamic range.
ES User's Guide 5-17