8 Trigger
8.1 Trigger
shown. The instrument trigger occurs at a time delayed by the accumulated offset
from the period trigger event. The periodic timer continues to run, and triggers
continue to occur, with a periodicity determined by the instrument time base. The
timer output (labeled "late event") will drift away from its ideal time due to imperfect
matching between the time base of the signal being measured and the time base of
the instrument, and also because of imperfect setting of the period parameter. But
the synchronization is restored on the next even-second clock event. ("Accumulated
offset" is described in the in the Offset function section.)
8.1.1.11 I/Q Mag
When I/Q Mag is selected, the trigger condition is met when the I/Q magnitude
crosses the I/Q magnitude trigger level. The magnitude is measured at the output of
the main I/Q digital receiver.
This trigger type is only valid for measurements that support the I/Q inputs.
The Trigger tab contains the following Trigger Source dependent controls when I/Q
Mag Trigger is selected:
–
"Prot Frame Aligned" on page 2340
–
"Trigger Delay" on page 2343
–
"Trigger Slope" on page 2347
Additional controls are also present that are not dependent on the selected Trigger
Source.
Example
:TRIG:<meas>:SOUR IQM
Annunciation I/Q Mag (in the Meas Bar)
8.1.1.12 Input I
When Input I is selected, the condition is met when the voltage at the I Input crosses
the trigger level.
This trigger type is only valid for measurements that support the I/Q inputs.
The Trigger tab contains the following Trigger Source dependent controls when
Input I Trigger is selected:
–
"Prot Frame Aligned" on page 2340
–
"Trigger Delay" on page 2343
–
"Trigger Slope" on page 2347
Short Range Comms & IoT Mode User's &Programmer's Reference 2336
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