Keysight U2761A Mode D'emploi page 45

Duty Cycle (Square Waves)
The duty cycle of a Square wave represents the amount of time per cycle that the
Square wave is at a high level (assuming that the waveform is not inverted).
Figure 2-7
Refer to
Pulse waveforms.
Duty Cycle
– 20% to 80% (frequency
– 40% to 60% (frequency > 10 MHz)
The duty cycle is stored in volatile memory where the duty cycle is set to default
50% upon power-off or after a remote interface reset.
The duty cycle setting is stored when you change from Square wave to another
function. Thus, when you return to the Square function, the previous duty cycle is
used.
Limits Due to Frequency
If the Square wave function is selected and you change to a frequency that cannot
produce the current duty cycle, the duty cycle is automatically adjusted to the
maximum value for the new frequency.
For example, if you currently have the duty cycle set to 70% and then change the
frequency to 12 MHz, the U2761A will automatically adjusts the duty cycle to 60%
(the upper limit for this frequency).
The duty cycle setting does not apply to a Square waveform used as the
modulating waveform for AM, FM, or PM. A 50% duty cycle is always used for a
modulating Square waveform. The duty cycle setting applies only to a Square
waveform carrier.
Keysight U2761A User's Guide
20% Duty Cycle
Square wave duty cycles
"Pulse Waveform"
80% Duty Cycle
on page 51 for the information on the duty cycle for
10 MHz)
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Features and Functions 2
45