HP 8753E manual Adapter Removal, Adapters Needed

Adapter Removal

The adapter removal technique provides a means to accurately measure noninsertable devices. The following adapters are needed:

w Adapter Al, which mates with port 1 of the device, must be installed on test set port 1.

nAdapter A2, which mates with port 2 of the device, must be installed on test set port 2.

nAdapter A3 must match the connectors on the test device. The effects of this adapter will be completely removed with this calibration technique.

N E T W O R K A N A L Y Z E R

A l

\

R E F E R E N C E

P O R T 1

D U T

A2

R E F E R E N C E

P O R T 2

A3

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Figure 5-11. Adapters Needed

The following requirements must also be met:

w Calibration standards for performing a 2-port error correction for each connector type.

w Specified electrical length of adapter A3 within f 114 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 removed when the third cal set is generated.

Optimizing Measurement Resutts 541