Measurement Computing WBK Options - Manual (Page 166)

WBK30, Memory Options 988296 WBK30, pg. 3
Software Setup
Reference Note:
Refer to the WaveView Document Module for detailed information regarding WaveBook’s
out-of-the-box data acquisition software. If you intend to write your own applications programs
refer to the WaveBook Programmer’s Manual (1008-0901). Both documents can be viewed
directly from your data acquisition CD by using the button located on the CD’s
opening screen.
WaveView
WBK30 is supported by WaveView versions 7.2 and higher. Check-boxes in WaveView’s
Memory Module Tab allow you to enable or disable the Pre-Trigger and/or Overflow Protection modes.
You can access the Memory Module Tab as described below. Note that both modes will be enabled by
default when WaveView first detects the presence of a WBK30.
To access the Memory Module Tab from WaveView’s
main window, make the following selections:
1) System pull-down menu
2) Options
3) Memory Module
Memory Module Tab
Enable WBK30 Pre-Trigger Mode — causes WaveView to use the Pre-Trigger Mode for high-speed
pre-trigger acquisitions. Pre-trigger Mode allows local buffering of pre-trigger acquisitions. WBK30
manages finite-length acquisitions entirely within its own buffer (instead of using the host PC's resources).
During the acquisition, the WaveBook begins acquiring data in advance of the trigger. When the trigger
occurs, a specified amount of the most recent "pre-trigger" data is preserved. The "post-trigger" data is then
collected as specified. Together, pre-trigger data and post-trigger data comprise the entire acquisition.
Without a WBK30, pre-trigger sample rates are limited by the transfer rate and pre-trigger data (including
any to be discarded) must be transferred into the PC's memory.
With WBK30, you can choose to buffer all data in the WBK30, until the acquisition is complete. Then, the
PC (at its own speed) reads the entire, correct acquisition. When in the pre-trigger mode, WBK30 must
have the capacity to hold all pre-trigger and post-trigger data.
Note: When using WBK30’s pre-trigger mode, the actual number of pre-trigger scans acquired
may be up to three scans less than the pre-trigger scan count programmed in the acquisition
configuration dialog box.