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Chapter 4 Remote Interface Reference
Pulse Width Modulation (PWM) Commands
4
PWM:INTernal:FREQuency {<frequency>|MINimum|MAXimum}
PWM:INTernal:FREQuency? [MINimum|MAXimum]
Set the frequency of the modulating waveform. Used only when the
Internal modulation source is selected (PWM:SOUR INT command).
Select from 2 mHz to 20 kHz. The default is 10 Hz. MIN = 2 mHz.
MAX = 20 kHz. The :FREQ? query returns the internal modulating
frequency in hertz.
PWM:DEViation {<deviation in seconds>|MINimum|MAXimum}
PWM:DEViation? [MINimum|MAXimum]
Set the pulse width deviation in seconds. This value represents the
variation in width (in seconds) from the pulse width of the carrier pulse
waveform. The default is 10 µs. MIN = 0 s. MAX = 1000 s (limited by the
period, minimum pulse width, and edge time). The :DEV? query returns
the pulse width deviation in seconds.
• The pulse width deviation cannot exceed the current pulse width.
• The pulse 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 = 20 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.
Wmin = 20 µs for period > 1000 s.
• The pulse 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)
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