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Channel Setup
TIP
It is disabled when the channel uses external trigger source or external modulation source.
Sync Polarity
It sets the output polarity of the sync signal to trigger an external device that may
require rising edge trigger or falling edge trigger. Click or tap the Polarity drop-down
button to select "Positive" or "Negative".
•
Positive: outputs normal sync signals.
•
Negative: outputs inverted sync signals.
Mark Frequency
When the output mode is set to "Sweep", you can enable the "Mark" function. After
the "Mark" function is enabled, the sync signal goes low at the specified mark
frequency. For details, please refer to
Table 12.1 Sync Signal of Different Output Modes (Positive Polarity)
Output Mode
Continuous
Mode
Modulation
Mode
DG900 Pro User Guide
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Mark Frequency
Descriptions
In Continuous mode (except noise and harmonic), the frequency
and duty cycle of the sync signal are related to the waveform
output frequency.
•
Output frequency ≤ 30 MHz: the sync signal frequency is the
fundamental frequency. The sync signal duty cycle for square
equals to the duty cycle of the output waveform. The sync
signal duty cycle for sine, ramp, pulse, and Arb (except DC) is
50%.
•
Output frequency ≤ 60 MHz: the sync signal frequency is
waveform frequency/2 and the duty cycle is 50%.
•
Output frequency ≤ 120 MHz: the sync signal frequency is
waveform frequency/4 and the duty cycle is 50%.
•
Output frequency ≤ 200 MHz: the sync signal frequency is
waveform frequency/8 and the duty cycle is 50%.
In Modulation mode, the sync signal is a square waveform with
50% duty cycle. In the first half period of the waveform, the sync
signal is a TTL high level.
•
For AM, FM, PM and PWM, the frequency of the sync signal is
the modulation frequency.
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.
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