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 Network Analyzers using PXI software

The trigger system operates at two levels: at the Analyzer level and at the channel level.

Analyzer States

The Analyzer can be in one of the following three states:

Stop the Analyzer waits for any channel to enter the Initiated state.

Waiting for a Trigger — the Analyzer waits for the trigger signal. If the Internal trigger source (see Trigger Source) is selected, it is automatically generated.

Measurement Cycle — all initiated channels are measured in turn.

The figure below shows the states of the Analyzer, and the transitions between them.

Trigger State Diagram

Analyzer states and transitions

Channel States

Channels can be in one of the three following states:

Hold — the channel waits for the initiation. If the continuous initiation mode (see Channel Initiation Mode) is selected, the channel is automatically initiated.

Initiated — the channel waits for the measurement after the trigger signal and measurement of other channels in the queue.

Measurement — the channel is measured.

The figure below shows the channel states, and the transitions between them.

Channel states and transitions

Channel states and transitions

The table below describes the transitions between analyzer and channel states.

Transition

Condition

Button

Command

1.1

To Stop

Power on

Reset

Preset

SYST:PRESet, *RST

Abort of the current measurement cycle.

Trigger > Restart

ABORt

Changing Analyzer settings by user or by the SCPI command.

For example: Stimulus > Start

For example: SENS:FREQ:STARt

1.2

Stop –> Waiting for Trigger

One or more channels make the transition 2.2 to the Initiated state.

1.3

Waiting for Trigger  –> Measurement Cycle

Automatically, if the trigger source is set to Internal.

Trigger source > Internal

TRIG:SOUR INT

At a signal arrival at the external trigger input, if the trigger source is set to External.

Trigger source > External

TRIG:SOUR EXT

At a softkey pressing, if the trigger source is set to Manual.

Trigger source > Manual

Trigger > Trigger

TRIG:SOUR MAN

Upon receipt of SCPI command, if the trigger Source is set to Bus.

Trigger source > Bus

TRIG:SOUR BUS

TRIG:SING, TRIG, *TRG

1.4

Measurement Cycle –> Waiting for Trigger

At the end of a measurement cycle, when at least one channel has the Continuous initiation mode.

Trigger > Continuous

INIT:CONT ON

After measuring a point, when the On Point trigger function is active.

Ext Trigger > Event > On Point

TRIG:POIN ON

1.5

Measurement Cycle –> Stop

At the end of a measurement cycle, when the Continuous initiation mode is disabled for all channels.

Trigger > Hold All Channels

2.1

To Hold

The same condition as transition 1.1

When the Initiation Mode of the channel has been set to Hold.

Trigger > Hold

INIT:CONT OFF

2.2

Hold –> Initiated

Every time if the Continuous initialization mode of the channel is turned on.

Trigger > Continuous

INIT:CONT ON

Once when the Single initiation mode of the channel has been set.

Trigger > Single

INIT

2.3

Initiated –> Measurement

Upon the occurrence of one of the conditions transition 1.3 and after measurement of other channels in the queue.

2.4

Measurement –> Hold

At the end of channel measurement.

2.5

Repeat measurement

If the averaging trigger function is on, the measurement repeats N times, where N is averaging factor.

Average > Avg Trigger > On

TRIG:AVER

 

Rev.:  22.3