Rigol DG800 Series, User Manual

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Chapter 2 Front Panel Operations RIGOL
DG800 User's Guide 2-83
Sync Setting
DG800 can output the basic waveforms (except Noise and DC), arb waveforms,
harmonics, sweep waveforms, burst waveforms, and the sync signal of the
modulated waveforms from a single channel or the dual channels at the same time.
The signal will be output from the rear-panel [CH1/Sync/Ext Mod/Trig/FSK]
connector.
1.
Sync Switch
Enables or disables the sync signal on the [CH1/Sync/Ext Mod/Trig/FSK]
connector. In the channel setting interface, tap the SyncSet menu label, and
then tap the SyncState parameter selection field to select "On" or "Off" to
enable or disable the sync signal output. By default, it is "On". That is, send the
sync signal to the [CH1/Sync/Ext Mod/Trig/FSK] connector. When
disabling the sync signal, the output level on the [CH1/Sync/Ext
Mod/Trig/FSK] connector is the logic low level.
2.
Sync Polarity
Sets the signal on the [CH1/Sync/Ext Mod/Trig/FSK] connector as
"Normal" or "Inverted". In the channel setting interface, tap the SyncSet menu
label, and then tap the Polarity parameter selection field to select "Positive" or
"Negative".

Positive: outputs the normal sync signal.

Negative: outputs the inverted sync signal.
Key Points:
Sync signals of various waveforms:
1. Basic Waveforms
1) When the frequency of the basic waveform is less than or equal to 100
kHz:
The sync signal is a Square with 50% duty cycle, and the same frequency
as that of the basic waveform. When the first waveform point is output,
the sync signal is TTL high level.
2) When the frequency of the basic waveform is greater than 100 kHz:

Sine and Ramp: the sync signal is a Square with 50% duty cycle.

Square and Pulse: the sync signal is a Square with a variable duty
cycle. The duty cycle varies with the duty cycle of the output signal.
Take 0 V voltage or the DC offset of the basic waveform as the reference,
the sync signal is TTL high level when the corresponding value of the
output signal is greater than the reference value. When the frequency of
the basic waveform is less than or equal to 30 MHz, the sync signal has
the same frequency as the basic waveform. When the frequency of the
basic waveform is greater than 30 MHz, the frequency of the sync signal