Keysight 33210A, Руководство пользователя

Страница: 200 / 351

198
Chapter 4 Remote Interface Reference
Pulse Width Modulation (PWM) Commands
4
PWM Commands
PWM:SOURce { INTernal | EXTernal }
PWM:SOURce?
Select the source of the modulating signal. The function generator will
accept an internal or external modulation source. The default is INT.
The
:SOUR?
query returns “INT” or “EXT”.
• If you select the External source, the carrier waveform is modulated
with an external waveform. The pulse width or pulse duty cycle
deviation is controlled by the ±5V signal level present on the rear-
panel Modulation In connector. For example, if you have set the pulse
width deviation to 50
µ
s using the
PWM:DEV
command, then a +5V
signal level corresponds to a 50
µ
s width increase. Lower external
signal levels produce less deviation.
PWM:INTernal
:FUNCtion { SINusoid | SQUare | RAMP | NRAMp | TRIangle | NOISe | USER }
:FUNCtion?
Select the shape of the modulating waveform. Used only when the
Internal modulation source is selected (
PWM:SOUR INT
command).
(The carrier must be a pulse waveform for PWM.) The default is SIN.
The
:FUNC?
query returns “SIN”, “SQU”, “RAMP”, “NRAM”, “TRI”,
“NOIS”, or “USER”.
• Select “SQU” for a square waveform with a 50% duty cycle.
• Select “RAMP” for a ramp waveform with 100% symmetry.
• Select “TRI” for a ramp waveform with 50% symmetry.
• Select “NRAM” (negative ramp) for a ramp waveform
with 0% symmetry.
Use the APPLy command or the equivalent FUNC, FREQ, VOLT, and
VOLT:OFFS commands to configure the carrier waveform.
33210A users guide.book Page 198 Wednesday, July 16, 2008 11:16 AM