161
Chapter 4 Remote Interface Reference
Output Configuration Commands
4
FUNCtion:SQUare:DCYCle {<percent>|MINimum|MAXimum}
FUNCtion:SQUare:DCYCle? [MINimum|MAXimum]
Set the duty cycle percentage for square waves. 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 inverted). The default is 50%
.
MIN selects the minimum duty cycle for the selected frequency
and MAX selects the maximum duty cycle (see restrictions below).
The :DCYC? query returns the current duty cycle setting in percent.
• Duty Cycle: 20% to 80% (frequency <
25 MHz)
40% to 60% (25 MHz < frequency <
50 MHz)
50% (frequency > 50 MHz)
• For square waveforms, the APPLy command overrides the current
duty cycle setting and automatically selects 50%.
• The duty cycle setting is remembered when you change from square
wave to another function. When you return to the square wave
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).
From the remote interface, a “Settings conflict
”
error will be generated and the duty cycle will be adjusted as described.
• 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.
20% Duty Cycle 80% Duty Cycle
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