BNC 835-M User Manual

Page 42

Model 835-M Programmer’s Manual V1.1 2011

:TRIGger Subsystem

Triggers control the playback by telling the Model 835-M when to play the signal.

Depending on the trigger settings for the Model 835-M, the waveform playback can occur once,
continuously, or the 835-M may start and stop playing the waveform repeatedly (GATE mode). A
trigger signal comprises both positive and negative signal transitions (states), which are also called
high and low periods. You can configure the 835-M to trigger on either state of the trigger signal. It
is common to have multiple triggers, also referred to as trigger occurrences or events, occur when the
signal generator requires only a single trigger. In this situation, the Model 835-M recognizes the first
trigger and ignores the rest.

When you select a trigger mode, you may lose the signal from the RF output until you trigger the
waveform.

There are four parts to configuring the trigger:

1. Choosing the trigger type which controls the waveform’s transmission.

x NORMal : trigger edge initiates/stops sweeps

x 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 Model 835-M 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)

Remark

TRIGger[:SEQuence]:TYPE

NORMal|GATE|POINt

N/A

V0.3.10

TRIGger[:SEQuence]:TYPE:GATE

LOW|HIGH

HIGH

V0.3.10

TRIGger[:SEQuence]:SOURce

IMMediate|KEY|EXT|BUS

IMM

V0.3.10

TRIGger[:SEQuence]:DELay

0 s

V0.3.10

TRIGger[SEQuence]:SLOPe

POSitive|NEGative

POS

V0.3.10

TRIGger[SEQuence]:RETRigger

ON|OFF|IMMediate

OFF

V0.3.10

[SOURce]:TRIGger[:SEQuence]:ECOunt

V0.3.10

[SOURce]:TRIGGer[:SEQuence]:OUTPut:POLarity

[SOURce]:TRIGGer[:SEQuence]:OUTPut:MODE

NORMal|INVerted

NORMal|GATE|POINt

NORM

V0.3.10

:TRIGger:TYPE

TRIGger[:SEQuence]:TYPE NORMal | GATE | POINT
TRIGger[:SEQuence]: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