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3
Chapter 3 Features and Functions
Output Configuration
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).
20% Duty Cycle
(See Pulse Waveforms, on page 70 for information about duty cycle for
pulse waveforms.)
• Duty Cycle: 20% to 80% (frequency < 10 MHz)
40% to 60% (frequency > 10 MHz)
• The duty cycle is stored in volatile memory; the duty cycle is set to
50% (the default) when power has been off or after a remote interface
reset (assuming the Power On state is set to "default").
• The duty cycle setting is remembered when you change from square
wave to another function. 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 function
generator will automatically adjust 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, PM or PWM. A 50% duty cycle
is always used for a modulating square waveform. The duty cycle
setting applies only to a square waveform carrier.
• Front-Panel Operation: After selecting the square wave function,
press the Duty Cycle softkey. Then use the knob or numeric keypad
to enter the desired duty cycle.
64
80% Duty Cycle
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