Agilent Technologies 8719D User Manual page 369

HP 8719D/20D/22D
OPTION
Figure 6-55. Comparison of Standard and Option 406 Instruments
Improving Raw Source Match and Load Match For TRL*/LRM* Calibration
A technique that can be used to improve the raw test port mismatch is to add high quality
system is improved because the hxed attenuators usually have a return loss that is better than
that of the network analyzer. Additionally, the attenuators provide some isolation of reflected
signals. The attenuators also help to minimize the difference between the port source match
and load match, making the error terms more equivalent.
With the attenuators in place, the effective port match of the system is improved so that the
mismatch of the fixture transition itself dominates the measurement errors after a calibration.
400
NETWORK ANAL'IZEP
Figure 6-56. Typical Measurement Setup
HP 8719D/20D/22D
STANDARD