Agilent Technologies 81134A Manual do Utilizador descarregar pdf (Página 4)

Variable Crossover

For each channel, the cross over of the NRZ signal in PRBS or data

mode can be adjusted. This is used to artificially close the eye pattern

simulating distortion. Figure 1 shows the normal and complement out-

put with cross over point set to 50% and 70% respectively.

NOTE: Variable Crossover feature is available in NRZ mode only.

Pattern

There are two types of patterns available:

· Data

Arbitrary data up to the maximum available memory per channel can be setup as pattern data.

· PRBS

Predefined PRBS of 2

-1 to 2

-1 can be setup as pattern data.

Data Polarity

In pattern mode the polarity of the data can be set to either normal or inverted. When set to inverted, a logical

'1' will become a logical '0' at the output and vice versa.

Levels

· Pre-defined Levels

Pre-defined levels allow the easy setup of the channels for commonly used logic families. These are: ECL,

ECLGND, LVT, LVPCL and LVDS.

· Custom Levels

Levels can be set to custom values in either of two ways:

· low level - high level

· amplitude - offset

· Level Protection

Output levels can be limited to a user defined range to protect the device under test. Level protection can be

switched on and off.

· Level Polarity

Level polarity can be set to either normal or inverted. Set to inverted, the low level and the high level values are

interchanged.

Outputs Enable/Disable

Outputs can be switched on and off independently for each channel and for each normal/complement connector.

Figure 1

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Agilent Technologies 81134A Manual do Utilizador Página 4