Keysight 33210A, Руководство пользователя

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87
Chapter 3 Features and Functions
Pulse Width Modulation (PWM)
3
Width Deviation
The width deviation represents the variation in width (in seconds) in the
modulated waveform from the width of the original pulse waveform.
• Width deviation: 0 s to 500 s (see below). The default is 10
µ
s.
• The width deviation cannot exceed the current pulse width.
• The width deviation is also limited by the minimum pulse width
(Wmin):
Width Deviation < Pulse Width – Wmin
and
Width Deviation < Period – Pulse Width – Wmin
where:
Wmin = 40 ns for period < 10 s.
Wmin = 200 ns for period > 10 s, but < 100 s.
Wmin = 2 µs for period > 100 s, but < 1000 s.
• The width deviation is limited by the current edge time setting.
Width Deviation < Pulse Width – (1.6 X Edge Time)
and
Width Deviation < Period – Pulse Width – (1.6 X Edge Time)
• Front-Panel Operation: After enabling PWM, press the
Width Dev
softkey. Then use the knob or numeric keypad to enter the desired
deviation.
• Remote Interface Operation:
PWM:DEViation {<
deviation in seconds
>|MINimum|MAXimum}
Note:
The pulse width and width deviation, and the pulse duty cycle and
duty cycle deviation are coupled in the front panel interface. If you select
Width
for the pulse waveform and enable PWM, the
Width Dev
softkey is
available. On the other hand, if you select
Dty Cyc
for the pulse waveform
and enable PWM, the
Dty Cyc Dev
softkey is available.
33210A users guide.book Page 87 Wednesday, July 16, 2008 11:16 AM