Agilent Technologies N4962A Uživatelská příručka stáhnout pdf (Strana 32)

System Details and Performance Specifications

Serial BERT 12.5 Gb/s User Guide

3.6 Data Path

The N4962A can operate in one of three data path configurations. The data

path can be set from the front panel, detailed in Section 4.2.2, or through GPIB

remote commands.

The current data path is indicated with the front panel lights. One of the three

lights will be lit. The lights are labeled Disabled, Enabled, and Thru.

The Disabled data path is selected by default; this disables the PRBS output

and can be considered a ‘safe mode’ to be used to avoid DUT damage. The

Enabled data path turns on the PRBS output. The Thru data path connects the

IN/IN¯¯ signals directly to the DataThru/DataThru¯¯¯¯¯¯ output connectors on the

back panel, with an associated switching loss in the data path. Errors are not

counted. The data path configurations are summarized in Table 10.

The Thru feature allows users to ensure the quality and amplitude of the

received signal is measured with a sampling scope without disconnecting the

cables from the N4962A. Once the path loss is determined, an accurate

estimate of the eye quality and amplitude can be determined for every test.

Table 10. N4962A data path configurations

Data Path light

Configuration

PRBS generator

Additional path loss

Disabled

IN/

IN¯¯ connected to error

detector, default

Disabled

Enabled

IN/

IN¯¯ connected to error

detector

Enabled

Thru

IN/

IN¯¯ connected to

DataThru/

DataThru¯¯¯¯¯¯

Enabled

Typ. 4 dB

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 87 88

Žádné komentáře

Agilent Technologies N4962A Uživatelská příručka Strana 32