Stanford Research Systems SR785, Operating Manual And Programming Reference

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Trigger Menu 4-105
SR785 Dynamic Signal Analyzer
If Delta RPM Sense is set to 'Incr. RPM' the trigger will arm only on an increasing RPM
change. If it is set to "Decr. RPM' the trigger will arm only on a decreasing RPM change.
If set to 'Abs. Change' the trigger will arm on any change by this amount.
Command: TRDR (?) {f}
Delta RPM Sense
Sets the sign of the rpm change which arms the trigger in the RPM Arming trigger mode.
The trigger can be set to arm on positive, negative, or any change in RPM of an amount
set by the Delta RPM softkey.
Command: TRDM (?) {i}
Time Arm Step
Sets the time interval for the Time Arming trigger mode. Once the Start RPM condition,
if any, has been met, the trigger will arm repetitively with this time interval.
Command: TIAS (?) {f}
Manual Arm
Manually arm the trigger. This function only applies if the Trigger Mode is Manual Arm.
Manual Arm enables triggering after [Start/Reset] only after the trigger is armed using
<Manual Arm> or from an interface command. Once the trigger is armed, the next
trigger event will trigger the measurement.
For FFT, correlation, and Time Histogram measurements each time record requires the
trigger to be re-armed. For octave and swept sine measurements, the first trigger after
arming starts the measurement and subsequent triggers are ignored.
Command: TARM
Manual Trigger
Trigger the measurements (and burst Chirp & Noise sources) regardless of Trigger
Source.
Manual Trigger Source requires <Manual Trigger> or an interface command to trigger.
Use Auto Arm Trigger Mode with Manual Trigger Source since unwanted triggers are
not a problem.