Features and Functions 3
Keysight 33210A User’s Guide 77
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).
(See Pulse Waveforms on page 83 for information about duty cycle for pulse
waveforms.)
– Duty Cycle: 20% to 80% (to 5 MHz)
40% to 60% (to 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 6 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, 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.
20% Duty Cycle 80% Duty Cycle
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