User`s guide

6-45
Calibrating for Increased Measurement Accuracy
Calibrating for Noninsertable Devices
Matched Adapters
With this method, you use two precision matched adapters which are "equal." To be equal,
the adapters must have the same match, Z
0
, insertion loss, and electrical delay. The
adapters in most Agilent calibration kits have matched electrical length, even if the
physical lengths appear different.
Figure 6-17 Calibrating for Noninsertable Devices
To use this method, refer to Figure 6-17 and perform the following steps:
1. Perform a transmission calibration using the first adapter.
2. Remove adapter A, and place adapter B on port 2. Adapter B becomes the effective test
port.
3. Perform a reflection calibration.
4. Measure the test device with adapter B in place.
The errors remaining after calibration with this method are equal to the differences
between the two adapters that are used.