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SDG7000A User Manual
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133
Table 10-16 Trigger sources for Burst
Trigger source
Description
Internal
The burst train output is controlled by an internal timer.
External
The generator receives the trigger/gating signal from the rear panel of
the instrument. When used as a trigger signal, each time a trigger edge
of a CMOS pulse is received, a burst signal is output. When used as a
gating signal, the high or low level of the signal is used to determine
whether or not to output the carrier.
Manual
When triggering manually, a trigger button will appear in the parameter
setting area and each press of this button will trigger one burst.
10.4.3 Burst Parameter Setting
Burst parameters and their detailed descriptions are shown in the following table.
Table 10-17 Parameters and description of Burst
Scanning
parameters
Description
Start phase
Initial phase at the start of the burst
Burst Period
This parameter is used to set the period of the burst signal (i.e. time
interval between burst trains).
Cycles
This parameter is only available when Burst type = N cycles and is used
to specify the number of periods each burst contains.
The number of periods can be set to "infinite" by clicking on the
parameter name field of the parameter setting box, indicating that a
continuous carrier will be the output after the trigger is received.
Counter
This parameter is only available when trigger source = External or
Manual. This parameter is used to specify the number of burst trains will
be output at every trigger.
Polarity
This parameter is only available when Burst type = Gated and is used to
specify the polarity of the gated signal. When polarity = positive, the
carrier signal is only output when gated high; when polarity = negative,
the carrier signal is only output when gated low
Trigger delay
This parameter is used to set the delay time from the trigger edge to the
head of the burst. The minimum value of the trigger delay represents the
minimum delay that can be achieved in hardware.
Trigger output
This parameter is only available when the trigger source = internal or
manual, and can be set to Up (rising edge align), Down (falling edge
align), or Off (disable trigger output).
Edge
This parameter is only available when the trigger source = external and
is used to specify the rising edge or falling edge as the trigger edge.
Hold Value
This parameter is used to specify the output signal at the end of the
burst.
It can be set to Start Value (start of the burst), End Value (end of the
burst), and Middle Value (offset of the carrier).
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