52
3
Making a Measurement
Trigger System
Trigger state and transition for each measurement
The following subsections describe the states for each measurement and how the trigger
system switches among the states.
“Hold” State
When one of the following commands has been executed, the trigger system switches to
“Hold” state, interrupting the measurement which is underway (arrow “e” in “d” on Figure
3-1). When the power is turned on, the phase noise measurement is triggered, while the
continuous initiation mode is set to ‘ON’ for the phase noise measurement and the trigger
source is set to “Internal”.
•
•
During the “Hold” state, if either one of the following commands is executed or the
measurement switches to the “Initiate” state by the front panel control, then the trigger
system switches to the “Waiting for Trigger” state (arrow “f” in “a” in Figure 3-1). “xx”
specifies the measurements (PN,SP,FP,TR) that are now waiting for trigger.
•
:INITiate:xx:IMMediate
•
:INITiate:xx:CONTinuous ON
“Waiting for Trigger” State
The instrument is triggered (i.e., a trigger is detected) during the “Waiting for Trigger”
state, and then the trigger system switches to the “Measurement” state (arrow “B” in “b” in
Figure 3-1).
As shown in the table below, how the instrument is triggered differs depending on which
trigger source is specified.
Trigger Source
How instrument is triggered
Internal trigger
The instrument is automatically triggered itself.
External trigger
The instrument is triggered when a trigger signal is fed
through the Ext Trig terminal.
Bus trigger
The instrument is triggered when the
page 275 is issued.
Manual trigger
The instrument is triggered when you press [Trigger] -
Trigger on the front panel.
[Trigger]
-
Manual Trigger
Wide band trigger
*1
In using the ‘wideband mode’ for the transient
measurement, the instrument is triggered when the
frequency of the measuring signal crosses the frequency
value of the wideband trigger setting.
Narrow band trigger
In using the ‘narrowband mode’ for the transient
measurement, the instrument is triggered when the
frequency of the measuring signal crosses the frequency
value of the narrowband trigger setting.
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Страница 28: ...28 1 Making Effective Use of This Manual How to Use This Manual ...
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