About Adapter Insertion - Agilent Technologies ENA Series User Manual

About Adapter Insertion

This above described method also makes it possible to add adapter characteristics to a port
with full n-port calibration. This allows you to make a measurement with the adapter.
E5070B/E5071B uses the following adapter insertion process to insert adapter
characteristics.
1. Perform calibration without the adapter in use.
2. Insert the adapter to the port and measure Open, Short and Load values to determine
the adapter's characteristics.
3. Insert the obtained adapter characteristics to the error coefficients in an De-embedding
fashion.
In order to determine the adapter characteristics (with four unkown parameters) by making
three measurements (Open, Short and Load), the adapter must satisfy the following
requirements.
• Adapter must be reciprocal (with S21 and S12 equal) in nature. It should have a
consistent behavior, independent of the direction from which it is used.
The electrical length of adapter should be known at an accuracy of ± 1/4 of wavelength.
•
Figure 4-45 Adapter insertion for E5070B/E5071B
Chapter 4
Calibration
Adapter Removal-Insertion
169