Agilent Technologies 8719D, User Manual

Page: 256 / 673

The adapter removal technique provides a means to accurately measure noninsertable devices.
The following adapters are needed:
n
Adapter Al, which mates with port 1 of the device, must be installed on test set port 1.
n
Adapter which mates with port 2 of the device, must be installed on test set port 2.
n
Adapter must match the connectors on the test device. The effects of this adapter will be
completely removed with this calibration technique.
Figure 1. Adapters Needed
The following requirements must be met:
n
Calibration standards for performing a error correction for each connector type.
n
Specified electrical length of adapter within wavelength for the measurement
frequency range.
For each port, a separate error correction needs to be performed to create two
calibration sets The adapter removal algorithm uses the resultant data from the two
calibration sets and the nominal electrical length of the adapter to compute the adapter’s
actual S-parameters. This data is then used to generate a separate third calibration set in
which the forward and reverse match and tracking terms are as if port 1 and port 2 could be
connected. This is possible because the actual S-parameters of the adapter are measured with
great accuracy, thus allowing the effects of the adapter to be completely removed when the
third cal set is generated.
642 Optimizing Measurement Results