8-2 Triggering Model 2701 User’s Manual
Trigger model
The flow chart in Figure 8-1 summarizes triggering as viewed from the front panel. It is
called a trigger model because it is modeled after the SCPI commands used to control
triggering.
NOTE For scanning, the trigger model has additional control blocks, such as a Timer.
These are described in Section 7 (Figure 7-1 and Figure 7-2). The complete
trigger model, which is based on bus operation, is shown and discussed in
“Remote programming – triggering,” page 8-14.
Figure 8-1
Front panel trigger model (without scanning)
Idle
When not scanning and in the continuous trigger mode (factory default setup), the
instrument will not stay in idle. Operation will continuously fall through the idle state and
proceed to the Event Detection block of the trigger model. When in the one-shot trigger
mode (*RST default setup), the TRIG key must be pressed to take the instrument out of
idle. After each measurement, the instrument returns to idle and requires the TRIG key to
be pressed to continue. The FACT (factory) default setup or *RST default setup is selected
from the SHIFT > SETUP menu (see “Defaults and user setups,” page 1-22).
When scanning, the unit is considered idle at the end of a scan operation when the reading
for the last channel remains displayed. To restore triggers, press SHIFT and then HALT.
See Section 7 for details on scanning.
Idle
Control
Source
Immediate
External
Event
Detection
Output
Trigger
Auto Delay or
Manual Delay
Device Action
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