Publication No. 980935 Rev. A
3152B User Manual
EADS North America Test and Services
Operation 3-11
as the active source for trigger events.
trig:tim <value>
This sets the period of the built-in trigger
generator. Unlike the Re-trigger run mode,
the internal trigger period defines actual
trigger events. Therefore, the period of the
internal trigger generator must be larger
than the period of the waveform.
trig:sour ttlt<n,1>
This selects and activates one or more of
the VXIbus backplane triggers (TTLTrg0
through TTLTrg7) as the active source for
trigger events. If more than one input is
activated, the instrument will accept trigger
events from all active trigger lines. Note
that if one of the lines is designated as an
output, it cannot be used as an active
source at the same time.
trig:sour bus
This selects the software trigger as the
active source for trigger events.
Selecting the
Trigger Level
The Trigger Level command sets the threshold level for the trigger
input connector only. The trigger level is adjustable from -10 V to
+10 V using the following command:
Trig:lev <value>
This programs the trigger level threshold
for signals that are applied to the front-
panel TRIG IN connector.
The default value is 1.6 V which is appropriate for TTL signals.
Selecting the
Trigger Slope
The Trigger Slope command selects between positive- and
negative-edge triggering. The inputs that will be affected by this
command are: Front-panel TRIG IN connector, TTLTrg lines 0
through 7, and ECLTrg line 0. Use the following command to select
slope sensitivity for trigger events:
trig:slop pos
This sets the 3152B to respond to positive
going transitions only. Positive transitions
must cross the trigger level threshold to
trigger a response.
trig:slop neg
This sets the 3152B to respond to
negative going transitions only. Negative
transitions must cross the trigger level
threshold to trigger a response.
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