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The use of cables and/or adapters does not effect the final measure
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ment result, if they were in place for the calibration process. The vec
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tor error corrections established during the calibration process elimi
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nates cable and/or adapter effects as long as the ports used are stable
and exhibit good repeatability. Figure 7-2 shows such a configuration.
Many calibration kits include adapters that are designed to have equal
phase length. These parts are called phase equal adapters (PEA).
Anritsu designs in-series adapters (e.g., K Connector M-M, M-F, F-F)
to be phase insertable when technically possible. When available, it is
good practice to use PEAs to establish test ports (Figure 7-3).
DISCUSSION MEASUREMENT CALIBRATION
7-4 37xxxE OM
PORT 1 PORT 2
ADAPTERS
Figure 7-2. Using Adapters on the Test Port
33KKF50
33KFKF50
TEST SET CONNECTOR
KM
TEST PORT 1
KM
TEST PORT 2
KF
CABLE CONNECTOR
KM
Figure 7-3. Use of PEAs to Establish Test Ports