Agilent Technologies N4962A Podręcznik Użytkownika Pobierz pdf (Strona 41)

Operation

Serial BERT 12.5 Gb/s User Guide 41

Text

Type

Description

Default

JitterI port.

• Synth 1

o options: 0, 1

Internal clock setting: 0 = use external clock

(internal clock

turned off); 1 = use internal clock.

• Err00000

Five

-digit error detector error counter, included

for low BER applications, or for testing external

error injection. The counter accumulates errors

since the detector was reset, and wraps around

99999. This

counter should not be used as the

authoritative number of errors counted.

• ErAd OFF

o options: OFF, 1E0, 1E1, 1E2, …, 1E7

Digital error injection setting, which indicates

how many bit inversions occur per second. OFF

indicates no bit errors are injected, 1E

0 indicates

1 error per second, 1E7 indicates 10 million errors

per second. To find the injected BER, divide by

the clock frequency. For example, at a setting of

1E2 (100) errors per second, the BER will be 1E

-8

at a clock rate of 10 GHz, or 8E

-9 at 12.5 G

Hz. See

Table

14.

When Display

->Ø is selected from the display

selector, pressing the Adjust

->Config State PLUS

button will prompt the N4962A to auto

matically

determine the optimum detector clock phase.

This is detailed further in Section

4.6.

• NoData 0

o options: 0, 1

NoData option helps with the initialization

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