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Chapter 3 Features and Functions
Output Configuration
3
Duty Cycle
Applies to square waves only. Duty cycle represents the amount of time
per cycle that the square wave is at a high level (assuming that the
waveform polarity is not reversed).
• Duty Cycle: 20% to 80% (frequency <
25 MHz)
40% to 60% (25 MHz < frequency <
50 MHz)
50% (frequency > 50 MHz)
• The duty cycle is stored in volatile memory; the duty cycle is set to
50% when power has been off or after a remote interface reset.
• 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 60 MHz, the function
generator will automatically adjust the duty cycle to 50% (the upper
limit for this frequency).
• If you select a square waveform as the modulating waveform for
AM or FM, the duty cycle setting does not apply. The function
generator always uses a square waveform with a 50% duty cycle.
• 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.
• Remote Interface Operation:
FUNCtion:SQUare:DCYCle {<percent>|MINimum|MAXimum}
The APPLy command automatically sets the duty cycle to 50%.
20% Duty Cycle 80% Duty Cycle
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