BNC 645 - Manual (Page 146)

146
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The symmetry setting does not apply when you use a ramp wave as the
modulating wave in AM or FM.
FUNCtion:RAMP:SYMMetry? [MINimum|MAXimum]
Query the current symmetry setting in percent.
FUNCtion:SQUare:DCYCle {<percent>︱ MINimum|MAXimum }
Specify the duty cycle percentage for square waves. Duty cycle represents the
time per cycle that a square wave is at its high level (supposing the waveform
polarity is not inverted). The default is 50%. The range is from 20% to 80%
when the waveform frequency is not greater than 10 MHz and from 40% to 60%
when the waveform frequency is greater than 10 MHz.
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The APPLY commands overrides this command and sets the duty cycle to
50%.
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The specified duty cycle is remembered and will be used when you change
the function and then come back to square waves.
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The duty cycle setting does not apply when you use square wave as the
modulating wave in AM, PM, FM, or PWM. The duty cycle of 50% for square
waves is used.
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When you use the square waveforms, but then later specify a frequency
that cannot produce the current duty cycle, the waveform generator
automatically adjust the duty cycle to accommodate the newly specified
frequency. From the remote interface, a “Settings conflict” error will be
generated.
FUNCtion:SQUare:DCYCle? [MINimum|MAXimum]
Query the current duty cycle in percent.
FUNCtion USER {<arb name>︱VOLATILE}
Choose one of the five built-in arbitrary waveform functions, one of four
user-defined waveforms, or the waveform currently downloaded to volatile
memory.
The names of the five built-in arbitrary waveforms are “EXP_RISE”, “EXP_FALL”,
“NEG_RAMP”, “SINC”, and “CARDIAC”. The default is “EXP_RISE”. If a
waveform stored in volatile memory is desired, specify the VOLATILE parameter.
This command does not output the chosen waveform. Use FUNCtion USER