Agilent Technologies N4962A Uživatelská příručka stáhnout pdf (Strana 42)

Operation

Serial BERT 12.5 Gb/s User Guide

Text

Type

Description

Default

sequence. When the source is used with the

error detector, this value should be set to 1. This

helps with a condition when all zeros are loaded

into the error detector’s input, which can

erroneously cause bad error rate numbers. This

shoul

d be set to 0 when using a different

manufacture

r’s pattern generator, or a known

good signal is used with the N4962A source.

• TD= 0010

o Min 0010 (1 µs), max 6500 (650 µs)

The TD (“Training Delay”) option delays the start

of the error detector after the BE

R measurement

has been initiated.

This feature is used in

conjunction with the NoData function. This delay,

listed in 1/10

microseconds (default 1us),

allows the PRBS pattern time to transition

through the DUT before measurement start. This

can be very important for DUTs containing a long

electrical length or an optical loop.

• APT=0010

o Min 0001 (0.1 ms), max 5000 (500

ms)

The APT (“Autophase Time”) option specifies the

autophase search algorithm measurement time at

each 2

-degree phase point. This option

allows the

user to specify the measurement depth of the

autophase algorithm.

APT allows a tradeoff between the search time

and positioning accuracy of the autophase

algorithm. Because 180 phase points are

measured, this option may increase th

autophase

time to a total of 90+ seconds.

The confidence interval of a BER measurement,

with frequency (GHz), gate time (seconds), and

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 87 88

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