Chapter 5 111
Setting Measurement Conditions
Selecting a Method to Start Measurement (Trigger Source)
5. Setting Measurement
Conditions
Selecting a Method to Start Measurement (Trigger Source)
Follow the steps below to select a trigger source, the cue generator for starting your
measurement.
Step 1. Press the
[Trigger] key to display the trigger menu.
Step 2. Press the
SOURCE [ ] key to display the trigger source menu.
Step 3. Use the following keys to select the trigger source.
NOTE See Chapter 10 , “Specifications and Supplemental Performance Characteristics,” on page
323 for characteristics of the signal required for an external trigger (triggering with a signal
from the external trigger input terminal on the rear panel).
See the “Programming Guide” for details on how to use the GP-IB/LAN trigger.
The trigger source currently selected is displayed in the key label
[ ] of the SOURCE [ ]
key.
Trigger source Key stroke
Internal (continuous triggering automatically
generated in the 4294A; also called free-run)
FREE RUN
External (triggering with a signal from the
external trigger input terminal on the rear
panel)
EXTERNAL
GP-IB/LAN (triggering generated with a
trigger command transferred via GP-IB or
LAN for starting measurement.)
HP-IB/LAN
Manual (triggering generated by pressing
MANUAL key)
MANUAL
Softkey label Selected trigger source
SOURCE [FREE RUN] Internal (free-run)
SOURCE [EXTERNAL] External
SOURCE [HP-IB] GP-IB/LAN
SOURCE [MANUAL] Manual
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