Agilent Technologies Z5623A manual Crosstalk

Models: Z5623A

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Performance Verification

Test Strategy

Return loss is specified for two different conditions:

Test port active (this means that the test port is internally connected either to the Reflection port or to the Transmission port)

Test port off (this means that the test port is internally connected to a 50-ohm termination)

Return loss is specified for the test ports, but not for the Reflection and Transmission ports.

Crosstalk

This measurement will be performed between each of the test set’s pairs of adjacent test ports (1 and 2, 2 and 3, 3 and 4, etc.). The test set will be commanded to connect its Reflection port to one of the test ports in the pair, and to connect its Transmission port to the other test port in the pair. An RF cable will connect Port 1 of the network analyzer to the Reflection port of the test set. Another RF cable will connect Port 2 of the network analyzer to the Transmission port of the test set. Network analyzer calibration will be turned off for this measurement. (The reason is that the isolation calibration achievable with the Electronic Calibration module is not good enough.) A Type N 50-ohm male short will be mounted on each test port in the pair.

The network analyzer will be configured to measure S21. By definition,

Crosstalk = S21

for the setup described above. Limit lines will be set up in such a way that each S21 limit equals the corresponding crosstalk test limit shown in Table 5-2.

Crosstalk is a maximum spec. Therefore, each S21 limit will be set up as a maximum limit. For example, if a crosstalk test limit happens to be −100 dB, the corresponding S21 limit will be set up so that S21 must be below −100 dB in order for the instrument to pass.

5 -6

Agilent Technologies Z5623A Option H48

Page 74
Image 74
Agilent Technologies Z5623A manual Crosstalk