Agilent Technologies N4962A Guia do Utilizador descarregar pdf (Página 49)

Operation

Serial BERT 12.5 Gb/s User Guide 49

4.5 System Verification

When first using the N4962A and before using the machine to test an external

DUT, first confirm that the system is generating a PRBS bit stream and can

detect bit errors.

4.5.1 Self Test Mode

Verify the PRBS generator and error detector are both functioning by

configuring the system in self-test mode as follows: connect the OUT/OUT¯¯¯

ports directly to the IN/IN¯¯ ports with the Agilent Technologies-supplied phase

balanced 50 Ω coaxial cables, use the internal clock at the default setting,

power the system, turn on the PRBS output, and adjust the error detector clock

phase, as follows:

• Connect TX CKO to TX CKI with coaxial cable (included; default)

• Connect RX CKO to RX CKI with coaxial cable (included; default)

• Connect OUT to IN with phase-balanced coax cable (included)

• Optionally connect OUT¯¯¯to IN¯¯ with phase-balanced coax cable

(included)

• Terminate all unused RF connectors with 50 Ω terminations

• Turn on the power switch from the back panel

• Press the Data Path->Select Path button and select Enabled

• Press the Display->Scroll ↓ button and select Ø

• Press the Adjust->Config State + button to auto-select the detector

phase

• Observe the Error ε light (should remain off, indicating no errors

detected)

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Agilent Technologies N4962A Guia do Utilizador Página 49