PWM Subsystem
10 μs, then a +5 V signal level corresponds to a 10 μs deviation. Lower external signal levels produce less devi-
ation. Negative signal levels produce negative deviation.
[SOURce[1|2]:]PWM:DEViation:DCYCle {<deviation_in_pct>|MINimum|MAXimum}
[SOURce[1|2]:]PWM:DEViation:DCYCle? [{MINimum|MAXimum}]
Sets duty cycle deviation in percent of period. This is the peak variation in duty cycle from the duty cycle of the under-
lying pulse waveform. For example, if duty cycle is 10% and duty cycle deviation is 5%, the duty cycle of the mod-
ulated waveform will vary from 5% to 15%.
Parameter Typical Return
Duty cycle in percent of period, from 0 to 99.9; default approximately 1 percent +5.000000000000000E+00
Set pulse width deviation to 5%:
PWM:DEV:DCYC 5
l Duty cycle deviation cannot exceed pulse duty cycle.
l Duty cycle deviation also limited by minimum pulse width (Wmin):
Duty Cycle Deviation < Duty Cycle – 100 x Wmin ÷ Period
and
Duty Cycle Deviation < 100 – Duty Cycle – 100 x Wmin ÷ Period
where Wmin = 16 ns.
l Duty cycle deviation limited by edge time.
Duty Cycle Dev < Duty Cycle – (80 x Leading Edge Time) ÷ Period – (80 x Trailing Edge Time) ÷ Period
and
Duty Cycle Dev < 100 – Duty Cycle – (80 x Leading Edge Time) ÷ Period – (80 x Trailing Edge Time) ÷
Period
l With PWM:SOURce EXTernal, deviation is controlled by the ±5 V signal level on rear-panel Modulation In con-
nector. For example, with duty cycle deviation of 5 percent, a +5 V signal level corresponds to 5% deviation, an
additional 5% of period added to the pulse duty cycle. Lower external signal levels produce less deviation, and neg-
ative signal levels reduce the duty cycle.
[SOURce[1|2]:]PWM:INTernal:FREQuency {<frequency>|MAXimum|MINimum}
[SOURce[1|2]:]PWM:INTernal:FREQuency? [{MAXimum|MINimum}]
Selects frequency at which output pulse width shifts through its pulse width deviation. The waveform used as the mod-
ulating source will operate at that frequency, within frequency limits of that waveform.
Parameter Typical Return
1 μHz to the maximum allowed for the internal function. Default 10
Hz
+1.000000000000000E+02
Sets frequency at which the output pulse width shifts through its pulse width deviation to 100 Hz:
PWM:INT:FREQ 100
Agilent 33500 Series Operating and Service Guide 273
To Next Page
Loading...
