Agilent-technologies Option H48 Multiport Test Set Z5623A Manual de usuario descargar pdf (Pagina 73)

Agilent Technologies Z5623A Option H48 5 -5

Performance Verification

Test Strategy

Insertion Loss

For this measurement, Port 1 of the network analyzer will be connected

to one of the test ports of the test set, and Port 2 of the network

analyzer will be connected either to the Reflection port or to the

Transmission port of the test set. By definition,

Insertion Loss = − S

where Insertion Loss and S

are both in units of dB.

The network analyzer will be configured to measure S

. Limit lines

will be set up in such a way that each limit equals the negative of the

corresponding insertion loss test limit shown in Table 5-2. For example,

if an insertion loss test limit happens to be 1.0 dB, the corresponding

limit will be −1.0 dB.

Insertion loss is a maximum spec. Therefore, each S

limit will be set

up as a minimum limit. For example, if an insertion loss test limit

happens to be 1.0 dB, the limit table will be set up so that S

must be

above −1.0 dB in order for the instrument to pass. (S

will always be

zero or negative because the test set provides no amplification. In units

of dB, S

can range from zero to minus infinity.)

Return Loss

For this measurement, Port 1 of the network analyzer will be connected

to one of the test ports of the test set, and Port 2 of the network

analyzer will be connected to the Reflection port of the test set. By

definition,

Return Loss = − S

where Return Loss and S

are both in units of dB.

The network analyzer will be configured to measure S

. Limit lines

will be set up in such a way that each limit equals the negative of the

corresponding return loss test limit shown in Table 5-2. For example, if

a return loss test limit happens to be 20 dB, the corresponding S

limit

will be −20 dB.

Return loss is a minimum spec. Therefore, each S

limit will be set up

as a maximum limit. For example, if a return loss test limit happens to

be 20 dB, the limit table will be set up so that S

must be below −20 dB

in order for the instrument to pass. (S

will always be zero or negative

because the test set provides no amplification. In units of dB, S

can

range from zero to minus infinity.)

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