User`s guide

External Trigger Data
External trigger data is identified in a time capture file with the following SDF_DATA_HDR attributes:
dataType 48 (external trigger data)
ydata_type LONG32
yIsComplex 0
scanData 0
If the trigger mode is set to be the external trigger at the time the capture was acquired and the tachometer
is turned on, then this data result may be present.
Each point in the external trigger data is a 32 external trigger counter value which represents time. There
is one time value associated with each scan of the time capture. The external trigger counter value is
converted to a time value the same way as the tachometer data (see above).
Standard Data Format (SDF)
B-39