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.
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
The table below describes the transitions between analyzer and channel states.
Transition |
Condition |
Button |
Command |
|---|---|---|---|
|
To Stop |
Power on |
— |
— |
Reset |
Preset |
||
Abort of the current measurement cycle. |
Trigger > Restart |
||
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 |
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 |
|
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 |
|
|
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 |
||
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 |
