Bnc 645 User Manual download pdf (Page 146)

146

z 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.

z The APPLY commands overrides this command and sets the duty cycle to

50%.

z The specified duty cycle is remembered and will be used when you change

the function and then come back to square waves.

z 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.

z 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

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Bnc 645 User Manual Page 146