Measurement Computing LogBook Series - Manual (Page 149)

Software Reference 989592 LogView LV-23
Using Exception Capturing
LogView can be set up to wait for defined events to occur, then capture data until another specified event.
The triggering process is controlled through the Acquisition Configuration window (see page LV- 42). If
Auto Re-arm is used, LogBook will then re-arm itself after each triggering sequence, waiting for the
occurrence of the next trigger event. This setup allows LogBook to capture specific events
rather than
a continuous data stream that may be useless in some applications. Exception capturing is useful
where continuous data would soon fill up the PC-Card with low-value data.
1. Click the (Acquisition Configuration) button to open the Acquisition Configuration window.
2. Set up the trigger parameter as required. The trigger can be set to various parameters including the
level of an analog input channel where you can select a threshold and hysteresis with rising or falling
edge. Trigger sources include analog input level, digital channel, immediate, absolute time, and
manual Event Mark.
When in the Manual mode, to enable the buttons on the LogBook
Monitor window and on LBK1 you must select the Enable Event Mart checkbox in the
Acquisition Configuration window. See the following figure.
Setting Up the Trigger Parameter
3. In the Pre-trigger tab, set up a duration of time occurring before the trigger event that you would like
to save data for. Exception capturing is most effective when you can set trigger parameters to isolate
the particular data of interest (e.g., all data 2 minutes before and after a specific event).
4. In the Post-trigger tab, you can set the stop event based on a duration, an analog or digital event, or
a manual Event Mark.
5. Enable auto Re-arm by setting the field to 10.
6. Set up input channels as needed in the Analog Input Channel Configuration window.
7. Save the setup file, download it to the PC-Card, and start the acquisition.
8. After the data has been acquired, upload the data files from the PC-Card with LogView’s Explorer or
button. Note that individual trigger blocks for each capture have indexed file names, with
each name being unique.
Reference Note: The File Management section of this document, which begins on page
LV- 8, contains detailed information regarding filename structure.