Adapter Removal (Es Analyzers Only) - Agilent Technologies 8753ET User Manual

Adapter Removal (ES Analyzers Only)

The adapter removal technique provides a means to accurately measure noninsertable
devices. The following adapters are needed:
• Adapter A1, which mates with port 1 of the device, must be installed on test set port 1.
• Adapter A2, which mates with port 2 of the device, must be installed on test set port 2.
• Adapter A3 must match the connectors on the test device. The effects of this adapter
will be completely removed with this calibration technique.
NOTE Adapters A1 and A2 become part of the test setup to allow connection to the
DUT.
Adapter A3 is used during the calibration only. Its effects will be removed.
Figure 6-13 Adapters Needed
The following requirements must also be met:
• Calibration standards for performing a 2-port error correction for each connector type
must be available.
• Specified electrical length of adapter A3 within ± 1/4 wavelength for the measurement
frequency range.
For each port, a separate 2-port 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
Calibrating for Increased Measurement Accuracy
Calibrating for Noninsertable Devices
6-41