Section 2: General operation Model 2651A High Power System SourceMeter® Instrument Reference Manual
2-28 2651A-901-01 Rev. A / March 2011
The following figure shows the general sequence for measurement triggering. The basic sequence is
as follows:
• When the output is turned on, the programmed source value is immediately applied to the device
under test (DUT).
• (Front panel operation only) If the immediate trigger source is selected, a measurement will be
triggered immediately. However, if the manual trigger source is selected, the front panel TRIG key
must be pressed.
• The unit waits for the programmed delay period (if any).
• The instrument takes one measurement.
• If the number of measurements is less than the programmed trigger count, it cycles back to take
another measurement (the measurement cycle will be repeated indefinitely if the infinite trigger
count is selected).
• For multiple measurements, the unit waits for the programmed trigger interval (if any) before
taking the next measurement.
Figure 7: Local triggering
Source Delay
Measure
Output
On
Interval
# Measures
< Count
Complete
Trigger In:
Front Panel (Immediate or TRIG)
Configuring trigger attributes in local mode
From the front panel, press the CONFIG key, and then select TRIG. The following menu items are
shown:
TRIGGER-IN: Use these options to select the trigger-in source:
• IMMEDIATE: Triggering occurs immediately and the unit starts once it is ready to take
measurements (for example, after the source output is turned on).
• MANUAL: The front panel TRIG key must be pressed to trigger the instrument to take readings.
COUNT: Sets the trigger count (number of measurements) as follows:
• FINITE: The unit will cycle through measurement cycles for the programmed trigger count (1 to
99999).
• INFINITE: The unit will cycle through measurement cycles indefinitely until halted.
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