BNC 835-3 Programmer Manual - Manual (Page 31)

Berkeley Nucleonics
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835-3
Programmer’s Manual v1.0
Page 31 of 37
• GATE : trigger level starts/stops sweep
2. Setting the waveform’s response to triggers:
— CONTinuous : reapeatedly accepts trigger events
— SINGle : uses only one trigger event
3. Selecting the trigger source which determines how the BNC MODEL 835-3 receives its
trigger signal, internally or externally. The GATE choice requires an external trigger.
3. Setting the trigger polarity when using an external source
Command Parameters Unit
(default)
[SOURce]:TRIGger[:SEQuence]:TYPE NORMal | GATE | POINT
[SOURce]:TRIGger[:SEQuence]:TYPE:GATE LOW|HIGH HIGH
[SOURce]:TRIGger[:SEQuence]:SOURce IMMediate|KEY|EXT|BUS IMM
[SOURce]:TRIGger[:SEQuence]:DELay S
[SOURce]:TRIGger[SEQuence]:SLOPe POSitive|NEGative POS
[SOURce]:RETRigger ON|OFF|IMMediate Not
impleme
nted
[SOURce]:TRIGger[:SEQuence]:ECOunt 1
:TRIGger:TYPE
[SOURce]:TRIGger:TYPE NORMal | GATE | POINT
[SOURce]:TRIGger:TYPE?
This command sets the trigger type that controls the waveform’s playback.
The following list describes the trigger type command choices:
NORMal
Upon triggering, the waveform sequence plays according to
settlings defined by :INITiate:CONTinuous (only once or repeatedly)
GATE An external trigger signal repeatedly starts and stops the
waveform’s playback. The time duration for playback depends on
the duty period of the trigger signal and the gate polarity selection.
The waveform plays during the inactive state and stops during the
active polarity selection state. The active state can be set high or
low. The gate mode works only with an external trigger source.
POINT Upon triggering, only a single point of the sweep (list) is played.
*RST NORM
:TRIGger:TYPE:GATE
[SOURce]:TRIGger:TYPE:GATE LOW|HIGH
[SOURce]:TRIGger:TYPE:GATE?
This command selects the active state (gate polarity) of the gate while using the gating
trigger mode. The LOW and HIGH selections correspond to the low and high states of an
external trigger signal. For example, when you select HIGH, the active state occurs
during the high of the trigger signal.
When the active state occurs, the BNC MODEL 835-3 starts the waveform playback at the
last played sample point, then stops the playback at the next sample point when the
inactive state occurs.
LOW
The waveform playback starts when the trigger signal goes low (active
state) and stops when the trigger signal goes high (inactive state).