Atec Agilent-81133A-81134A - Manual (Page 3)

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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 an 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 when operating
the instrument in the data/pattern
modes.