HBM Genesis GEN5i User Manual page 115

GEN5i
Figure 9.5: Ring buffer with trigger and end-of-recording
Since the trigger stops the storage, all stored information is termed pre-trigger
information. When storage stops because the acquired signal has met a trigger
condition, only pre-trigger information is available - information recorded before
the signal met the trigger condition.
Figure 9.6: Full pre-trigger storage: pre-trigger = 100%
More often one is interested in what happened just before and after the
condition was met. To achieve this aim, a delay is introduced. Once the trigger
condition is met, storage is stopped - not immediately, but only after a
programmable delay counter has counted out. The memory now contains pre-
trigger information and post-trigger information.
Figure 9.7: Pre-trigger / post-trigger storage: 0% < pre-trigger < 100%
I2679-4.0 en 115