The operation of the PWM[1|2]:DEV:DCYC command is affected by the
FUNC[1|2]:PULS:HOLD command 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[1|2]:DEV:DCYC command are automatically
converted to the equivalent width deviation in seconds