Agilent Technologies 81134A Manual de usuario descargar pdf (Pagina 3)

Channel Modes

The following channel modes are available, if the instrument main mode is set to pulse/pattern:

Note: The frequency of each channel can be optionally divided by 1, 2, 4, 8, 16, 32, 64, 128.

· Square

Generates a square wave (clock) of fixed width (50% duty cycle)..

· Pulse

Generates pulses with selectable width or duty cycle.

· Data

Generates data in either RZ, R1 or NRZ format. In RZ and R1 mode, the pulse width can be selected as either

width or duty cycle.

· PRBS

Outputs a selectable PRBS (pseudo random binary sequence) polynomial of either RZ, R1 or NRZ format . In RZ

and R1 mode, the pulse width can be selected as either width or duty cycle.

Timing

Delay

The delay can be set:

· As absolute value in nano seconds or pico seconds

The delay remains unchanged as the frequency or the period is modified.

· As phase (degrees relative to period)

The phase remains unchanged as the frequency or the period is modified.

Deskew

The deskew adjustment allows for the compensation of e.g. cable delays.

Deskew adjustment is not available in Direct Mode. In this case, all channels are factory deskewed at the front

panel connectors.

Width

There are two ways to set the pulse width:

· As absolute value in nano seconds or pico seconds

(In absolute mode, the pulse width stays constant when the frequency or period is changed.)

· As duty cycle (percentage of period)

(In duty cycle mode, the duty cycle stays constant when the frequency or period is changed.)

NOTE: Width adjustment is not available if data mode is set to NRZ.

Pulse Format

· RZ

Return to zero pulse format. On 0 bit patterns, the signal remains at the low level. On 1 bit patterns, the signal

goes high and back to the low level after the time specified by the pulse width or the duty cycle parameter.

· R1

Return to one pulse format. On 1 bit patterns, the signal remains at the high level. On 0 bit patterns, the signal

goes low and back to the high level after the time specified by the pulse width or the duty cycle parameter.

· NRZ

Non-return to zero pulse format. The signal remains at the low level or high level according to the bit level of the

pattern for the entire period.

NOTE: The pulse format selection is only available in one of the pattern modes.

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Agilent Technologies 81134A Manual de usuario Pagina 3