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38 U2761A User’s Guide
2 Features and Functions
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 Square wave duty cycles
Refer to “Pulse Waveform” on page 45 for the information on
the 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 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).
20% Duty Cycle 80% Duty Cycle