Remote Interface Reference 4
Keysight 33210A User’s Guide 219
– The duty cycle deviation is also limited by the minimum pulse width (Wmin):
Duty Cycle Deviation <
Duty Cycle – 100 × Wmin ÷ Period
and
Duty Cycle Deviation <
100 – Duty Cycle – 100 × Wmin ÷ Period
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 duty cycle deviation is also limited by the current edge time setting.
Duty Cycle Dev <
Duty Cycle – (160 × Edge Time) ÷ Period
and
Duty Cycle Dev <
100 – Duty Cycle – (160 × Edge Time) ÷ Period
–
If you select the
External
modulating source (
PWM:SOUR EXT
command
), the
deviation is controlled by the ±5V signal level present on the rear-panel
Modulation In connector. For example, if you have set the duty cycle deviation
to 5 percent, a +5V signal level corresponds to a 5 percent deviation, that is an
additional 5% of period added to the pulse duty cycle. Lower external signal
levels produce less deviation, and negative signal levels reduce the duty cycle.
The operation of the PWM:DEV:DCYC command is affected by the
FUNC:PULS:HOLD command (see “Pulse Configuration Commands” on page 202
for further information). The FUNC:PULS:HOLD command determines whether
pulse width (the default) or pulse duty cycle values are to be held constant as
the period is varied. If the width is held, so is the width deviation. If the duty
cycle is held, so is the duty cycle deviation. If pulse width and width deviation
are being held, duty cycle deviation values specified with the PWM:DEV:DCYC
command are automatically converted to the equivalent width deviation in
seconds.
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