Measurement Computing TempScan/1100 - Manual (Page 75)

TempScan / MultiScan User's Manual 879596 System Configuration 4-17
• Auto Re-arm: This parameter is the feature which determines whether or not, after the initial
acquisition, the acquisition will be re-enabled automatically. If the Auto Re-arm feature is in use, the
TempScan/1100 or MultiScan/1200 unit will immediately begin looking for another Trigger event
once a Stop event and Post-Stop count are detected to indicate that the current acquisition has
terminated. When the next Trigger is detected, a new acquisition with the same channel configuration
will be enabled automatically. Otherwise, if this feature is not in use, and the initial acquisition has
terminated, a Set Trigger Configuration (
T ) command must be issued after a Stop event, before the unit
can begin looking for a Trigger.
However, using Auto Re-arm does not allow you to change the Trigger configuration between
Triggers. Consequently, the initial configuration will be used until the Auto Re-arm is disabled. To
disable the Auto Re-arm flag, a Set Trigger Configuration (
T ) command must be issued with the re-
arm parameter set to zero. Data will still be available after the T command is issued.
• Trigger Synchronization: This parameter is a flag which determines whether or not the Trigger
(trigger start event) should be synchronized with the Pre-Trigger scan interval, provided that both the
Pre-Trigger count and normal scan interval are configured via the Set Counts (Y) and Set Scan
Interval (I) commands, respectively. If this flag is set, then the Trigger scans will begin on the next
"tick" of the Pre-Trigger scan interval, regardless of the exact point in time when the actual Trigger
occurred. So, if the actual Trigger occurs between "ticks" of the Pre-Trigger scan interval, then the
acquisition will not begin until the next "tick" of the Pre-Trigger scan interval. Otherwise, the
acquisition of Post-Trigger scans will begin independently at the exact point when the Trigger (trigger
start event) is detected.
Trigger Start & Stop Event Sources
As already mentioned, the TempScan/1100 or MultiScan/1200 can be configured so that the Trigger and
Stop are assigned different trigger sources. However, since the Set Trigger Configuration (
T ) command
governs the configuration of an acquisition, all other acquisition-dependent commands should be sent
before the trigger sources are assigned via the Set Trigger Configuration (
T ) command. The required
acquisition-dependent commands will depend on the selected trigger sources. For instance, if the unit is
configured for Trigger On (
@ ) command, it will not be necessary to send the unrelated Set Trigger Level
( L ) command.