RIGOL DG4000 Series - Manual (Page 176)

RIGOL Chapter 10 Utility and System Settings
DG4000 Series User’s Guide 10-4
with 50% duty cycle. For ASK, FSK and PSK, in external modulation mode,
there is no sync signal output.
 For OSK, the sync signal is a square with 50% duty cycle and takes OSK
rate as reference. The sync signal is TTL high level when the internal
crystal oscillator starts to oscillate. In external modulation mode, there is
no sync signal output.
 For Sweep, when “Mark” is disabled, the sync signal is a Square with 50%
duty cycle. It is TTL high level at the start of the sweep and changes to
TTL low level at mid-point of the Sweep and its frequency corresponds to
the specified sweep time, return time, start hold and end hold times.
When “Mark” is enabled, the sync signal is TTL high level when sweep
starts and transforms to TTL low level at the marked frequency point.
 For a N cycle burst, the sync signal is TTL high level when burst starts and
transforms to TTL low level while the specified number of cycles end (if
the waveform has a relative start phase, the crossing point may not be
zero). For an infinite burst, its sync signal is the same as the sync signal
of a continuous waveform.
 For an external Gated burst, its sync signal follows its gated signal. Note
that the sync signal will not transform to TTL low level until the last period
is finished (if the waveform has a relative start phase, the crossing point
may not be zero).
Sync Polarity
Set the sync signal on the [Sync] connector as normal or inverted.
Press Utility  CH1Set  Polarity to select “Pos” or “Neg”.
 Pos: output normal sync signal.
 Neg: output inverted sync signal.
Notice that the sync signal related to the waveform is not inverted even when the
waveform is inverted.