Measurement Computing WaveView - Manual (Page 13)

WaveView 03-05-02 WaveView, pg. 11
System … Options
“Performance” Tab
z z Acquisition Data Packing
( WaveBook/512 and /512H Only ):
WaveBook/512 and /512H devices acquire 12-bit data and
transfer it to WaveView in 16-bit words. Data can be
compressed so four 12-bit samples are packed into three
16-bit words. This reduces transfer time and data storage
requirements. Use packed data if buffer overrun errors
occur. Disadvantages include extra processing time for
unpacking data and some loss in resolution (less than ½
LSB).
The Data Packing option does not apply to the
WaveBook/516, /512A, /516A, or to WavePorts,
and is disabled for these devices.
•
Calibration:
Factory Calibration Table (default), the software uses the
factory generated calibration constants of each system
component to achieve calibration of the system. This is
useful if the system calibration changes often.
User Calibration Table, the WaveCal program lets you
perform a calibration of the complete signal path from input
to A/D stage. The cal constants are stored in the Calibration
Table on the WaveBook main board. Recalibration is
required when any part of the signal path changes. This
method is useful when the configuration remains stable and
you want slightly better accuracy.
System Options
Performance Tab Selected
WavePort devices should only be calibrated at the factory, or by a factory-authorized service representative.
In regard to WavePort devices, leave the Calibration Radio Button selected to Factory Calibration Table.
WBK17 modules should only be calibrated at the factory, or by a factory-authorized service representative.
For WBK17, leave the Calibration Radio Button selected to Factory Calibration Table.
z z Acquisition Buffer Size:
Allows you to set a new buffer size for data acquisition. The dialog displays the maximum size of the acquisition
buffer. The buffer is never sized larger than needed by the acquisition. For a one-channel, 1000 scan acquisition
the buffer will be 2000 bytes, not the size shown in the dialog.
“Memory Module” Tab
Note: The WaveView System Memory Module Option settings
are only pertinent if a WBK30 Memory module option
card is installed in your WaveBook.
•
Pre-Trigger Mode : This allows you to use the full
bandwidth of your instrument regardless of the computer's
data transfer speed. Note that when Pre-Trigger is in
effect, certain conditions apply: (1) The entire acquisition
must fit in the WBK30's internal memory, (2) The scan
count will not update during acquisition, and (3) The Pre-
Trigger Mode selection only applies if pre-trigger is used.
•
Overflow Protection : This preserves and transfers all
data in the instrument when an acquisition ends early due to
an error or manual disarm.
This option should not be used if you: (1) Never want to
save data from an incomplete acquisition, or (2) You want
the option to work like it does without a WBK30 installed.
System Options
Memory Module Tab Selected