Chapter 4 Making Measurements 89
Table 21. Event Combinations
Trigger Arm
Event
Trigger
Event
Sample
Event
Description
AUTO AUTO Any One reading is taken per sample event (if the sample event is
AUTO, readings are taken continuously).
AUTO EXT AUTO, EXT, TIMER,
LINE, LEVEL
After a negative edge transition on the Ext Trig input, one
reading is taken per sample event until the specified number
of readings are completed.
AUTO EXT SYN Illegal
AUTO LEVEL AUTO, EXT, TIMER,
LEVEL
After the LEVEL event
1
occurs, one reading is taken per
sample event, until the specified number of readings are
completed.
AUTO LEVEL SYN, LINE Illegal
AUTO LINE AUTO, EXT, TIMER,
LINE
After the power line voltage crosses zero volts, one reading is
taken per sample event until the specified number of readings
are completed.
AUTO LINE SYN, LEVEL Illegal
AUTO SGL Any After executing the TRIG SGL command, one reading is
taken per sample event until the specified number of readings
are completed. The trigger event then becomes HOLD. When
using the SYN sample event, the input buffer must be
enabled or you must suppress cr lf when sending the TRIG
SGL command.
AUTO SYN SYN
After the controller requests data,
2
both SYN events are
satisfied and the first reading is taken. One reading is then
taken per SYN event until the specified number of readings
are completed.
AUTO SYN AUTO, EXT, LEVEL,
LINE, TIMER
After the controller requests data,
2
one reading is taken per
sample event until the specified number of readings are
completed.
EXT AUTO Any After a negative edge transition on the Ext Trig input, one
reading is taken per sample event until the specified number
of readings are completed.
EXT EXT AUTO, EXT, TIMER,
LINE, LEVEL
After two negative edge transitions on the Ext Trig input, one
reading is taken per sample event until the specified number
of readings are completed.
EXT EXT SYN Illegal
EXT LEVEL AUTO, EXT, TIMER,
LEVEL
After a negative edge transition on the Ext Trig input followed
by the occurrence of the LEVEL event
1
, one reading is taken
per sample event until the specified number of readings are
completed.
EXT LEVEL SYN, LINE Illegal
1
The LEVEL event occures when the specified voltage is reached on the specified slope of the input
signal. The LEVEL trigger event or sample event can only be used for DC voltage or direct-sampled
measurements.
2
The output buffer must be empty and reading memory must be OFF or empty for the SYN event to occur.
3
The input buffer must be enabled or you must suppress cr lf when sending the TARM SGL command.
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