FUNCtion Subsystem
l
For ramp waveforms, the
command overrides the current symmetry setting and selects 100%. To
set a symmetry other than 100%, select the ramp waveform output with the
command, then
use FUNCtion:RAMP:SYMMetry to set the symmetry.
l
The symmetry setting is remembered when you change from ramp wave to another function. When you return to
the ramp wave function, the previous symmetry is used.
l
When ramp is the modulating waveform for AM, FM, PM, or PWM, the symmetry setting does not apply. The instru-
ment always uses a ramp waveform with 100% symmetry.
[SOURce[1|2]:]FUNCtion:SQUare:DCYCle {<
percent
>|MINimum|MAXimum}
[SOURce[1|2]:]FUNCtion:SQUare:DCYCle? [{MINimum|MAXimum}]
Sets duty cycle percentage for square wave.
Parameter
Typical Return
0.01 to 99.99, subject to limitation of 16 ns minimum pulse width; default 50
+5.00000000001
Set duty cycle to 30%:
FUNC:SQU:DCYC 30
Sets the duty cycle to 8%, if output frequency is 5 MHz:
FUNC:SQU:DCYC MIN
l
Duty cycle represents the amount of time per cycle that the square wave is at a high level (assuming normal polar-
ity).
l
For square waveforms, APPLy:SQUare replaces the current duty cycle setting with 50%. To set a duty cycle other
than 50%, select the square wave with FUNCtion SQUare, then use FUNCtion:SQUare:DCYCle.
l
The duty cycle setting is remembered when you change from square wave to another function. When you return
to square wave, the previous duty cycle is used.
l
Limits Due to Frequency:
As frequency is increased, minimum and maximum duty cycle limits are adjusted to
maintain a minimum pulse width of 16 ns. For example, at 1 MHz the minimum duty cycle is 1.60% and max-
imum duty cycle is 98.40%. At 10 MHz, the minimum duty cycle is 16.00% and the maximum duty cycle is
84.00%.
l
If you select a square waveform as the modulating waveform for AM, FM, PM, or PWM, the instrument always uses
a square wave with 50% duty cycle.
[SOURce[1|2]:]FUNCtion:SQUare:PERiod {<
seconds
>|MINimum|MAXimum}
[SOURce[1|2]:]FUNCtion:SQUare:PERiod? [{MINimum|MAXimum}]
Sets period for square wave.
Parameter
Typical Return
33.3 ns to 1,000,000 s, default 1 ms
+5.000000000000000E-01
Set period to 500 ms (two methods):
FUNC:SQUare:PER .5
FUNC:SQUare:PER 500 ms
Agilent 33500 Series Operating and Service Guide
223
