Capture data before the trigger.

The pre-trigger buffer allows for capturing data long before the trigger event occurred. This is useful for analyzing the cause of an event.

The typical property of a pulse shaped signal is that it has a short existence in time, only a few samples. This implies that the pulse has a wide spectral content. A typical signal consists of a series of pulses that are recorded one by one or all as a bunch. Important digitizer parameters for pulse measure are high bandwidth, time-stamp and high dynamic range.