90 Chapter 4 Making Measurements
EXT LINE AUTO, EXT, TIMER,
LINE
After a negative edge transition on the Ext Trig input followed
by the power line voltage crossing zero volts, one reading is
taken per sample event until the specified number of readings
are completed.
EXT LINE SYN, LEVEL Illegal
EXT SGL ANY Illegal
EXT SYN SYN After a negative edge transition on the Ext Trig input followed
by the controller requesting data
2
(which satisfies both SYN
events), the first reading is taken. One reading is then taken
per SYN event until the specified number of readings are
completed.
EXT SYN AUTO, EXT, TIMER,
LINE, LEVEL
After a negative edge transition on the Ext Trig input,
followed by the controller requesting data
2
one reading is
taken per sample event, until the specified number of
readings are completed.
HOLD Any Any No readings taken until the trigger arm event is changed.
AUTO, EXT,
SGL, SYN
HOLD Any No readings taken until the trigger event is changed. When
using the SGL trigger arm event and the SYN sample event,
the input buffer must be enabled or you must suppress cr lf
when sending the TARM SGL command.
SGL AUTO Any After executing the TARM SGL command, one reading is
taken per sample event until the specified number of readings
are completed. The trigger arm 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 TARM
SGL command.
SGL EXT AUTO, EXT, TIMER,
LINE, LEVEL
After executing the TARM SGL command followed by a
negative edge transition on the Ext Trig input, one reading is
taken per sample event, until the specified number of
readings are completed. The trigger arm, event then
becomes HOLD.
SGL EXT SYN Illegal
SGL LEVEL AUTO, EXT, TIMER,
LEVEL
After executing the TARM SGL command followed by the
occurrence of the LEVEL event,
1
one reading is taken per
sample event until the specified number of readings are
completed. The trigger arm event then becomes HOLD.
SGL LEVEL SYN, LINE Illegal
SGL LINE AUTO, EXT, TIMER,
LINE
After executing the TARM SGL command followed by the
power line voltage crossing zero volts, one reading is taken
per sample event until the specified number of readings are
completed. The trigger arm event then becomes HOLD.
SGL LINE SYN, LEVEL Illegal
SGL SGL Any Illegal
Table 21. Event Combinations
Trigger Arm
Event
Trigger
Event
Sample
Event
Description
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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