Agilent Technologies N5980A Manual do Utilizador descarregar pdf (Página 6)

Serial BERT N4906B, Data Sheet V.3 6

Figure 8: Eye contour with colors indicating the BER level

The eye contour measurement generates a three-di-

mensional bit error rate (BER) diagram as a func-

tion of the sample delay and the sample threshold.

With this measurement, the complete eye of the

DUT output signal is measured. The results com-

prise the voltage and timing of the eye opening and

the BER level. Different result views are available:

eye contour, pseudo colors and equal BER plots.

Figure 9: Error location capture indicates the position of errored

bits

The error location capture measurement allows

capturing the actual position of errored bits in a

memory-based pattern. The instrument searches for

the ﬁ rst bit errored in the incoming bit stream and

marks it in the pattern. The address of the errored

bits can be displayed after the error is located. This

feature can be used to ﬁ nd rare or random errors.

A DUT could have problems handling long series of

zeroes. Error location capture can be used to locate

the bit errors in such cases.

Figure 10: Output level measurement

The output level measurement allows to character-

ize the behavior of the output levels of a device

under test (DUT). The sampling delay is ﬁ xed. The

error detector’s decision threshold is automatically

swept within a user-deﬁ ned range. A direct result is

the determination of the optimum decision thresh-

old level for receiving data from the DUT with maxi-

mum conﬁ dence. Three result views are available:

Q-factor, BER vs. threshold, and dB histogram vs.

threshold.

dataTec GmbH

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Ferdinand-Lassalle-Str. 52

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72770 Reutlingen

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Tel. 07121 / 51 50 50

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Fax 07121 / 51 50 10

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info@datatec.de

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www.datatec.de

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