Keysight E8663D, Руководство пользователя

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Keysight E8357D/67D & E8663D PSG User’s Guide 127
Basic Digital Operation
Triggering Waveforms
Source
Mode and Response
The arbitrary waveform player provides four trigger modes ; each mode has one
or more possible responses :
— Single plays the waveform once. Arb formats have the following
retriggering options:
— Off ignores triggers received during play; a trigger received after
playback completes restarts the playback.
— On causes a trigger received during play to repeat the waveform after
the current play completes.
— Immediate causes a trigger received during play to immediately
restart the waveform.
— Gated causes the waveform to wait for the first active trigger signal state to
begin transmission, then repeatedly start and stop in response to an
externally applied gating signal (example on page 129 ). You select the
active state with the Gate Active Low High softkey (see page 129 ).
In an ARB format, the waveform plays during the inactive state, and stops
during the active state.
In real–time Custom, behavior depends on whether the signal incorporates
framed or unframed data.
Because the PSG provides only unframed data, to transmit a framed data
signal you must create an external file that incorporates the framing and
download it to the PSG (see the Keysight Signal Generators Programming
Guide ).
— Unframed data transmits during active states, and stops during
inactive states. The signal stops at the last transmitted symbol and
restarts at the next symbol.
— Framed data starts transmitting at the beginning of a frame during
active states, and stops at the end of a frame when the end occurs
during inactive states. If the end of the frame extends into the next
active state, the signal transmits continuously.
The Trigger hardkey
A command sent through the rear panel GPIB, LAN, or Auxiliary (RS–232) interface
An external trigger signal applied to either the PATTERN TRIG IN connector, or the PATT TRIG IN 2
pin on the AUXILIARY I/O connector (connector locations are shown in
Figure 1-3 on page 26
).
The following parameters affect an external trigger signal:
– The source (Input connector) of the external trigger signal (see
page 128
)
– The polarity of the external trigger (described on
page 129
)
– Any desired delay between when the PSG receives an external trigger and when the
waveform responds to it (see
page 128
).