Measurement Computing WBK Options - Manual (Page 167)

WBK30, pg. 4 988296 WBK30, Memory Options
Enable Overflow Protection Mode — causes WaveView to use Overflow Protection for all acquisitions.
Usually, when buffer overflow occurs, the acquisition stops and all data in the FIFO is purged. Overflow
Protection forces WaveBook to transfer all data that existed up to the time of the overflow. Note that data
is preserved if you cancel a transfer by selecting the STOP button in either the Scope or
Direct-to-Disk window.
Note: Disable the Overflow Protection Mode if you do not want data from a stopped acquisition.
DaqX Programming of WBK30
Programmers wanting to create their own programs should refer to the separate Programmer’s Manual
(p/n 1008-0901). Note that only DaqX version API (versions 2.4 and higher) supports WBK30. The older
wbk-prefixed commands cannot address the WBK30.
WBK30 – Specifications
Name/Function: WaveBook Memory Option / expands internal data FIFO from 64 Ksamples to 8-64 Msamples
Memory Capacity (M = 1,000,000)
Part Number WBK30/16 WBK30/64 WBK30/128
Bytes 16.7 M 67.1 M 134.2 M
Samples 8.3 M 33.5 M 67.1 M
Packed Samples 11.1 M 44.7 M 89.4 M
Maximum Acquisition Length:
Pre-Trigger Acquisitions: Same as memory capacity
Post-Trigger Acquisitions: Depends on PC transfer rate, acquisition rate (both in samples per
second), and capacity as follows:
Maximum Acquisition Length = T × acquisition rate
Where: T = Time-to-overflow = Capacity / (acquisition rate - transfer rate)
Example:
Acquiring 500 K unpacked samples per second with a WBK30/16 and a PC capable of
transferring 200 Ksamples/second, overflow will occur in: T = 8.3M / (500K - 200K) = 27.6
seconds, thus: Acquisition Length = 27.6 seconds × 500K = 13.8 million samples
Pre-Trigger Mode: Allows indefinite pre-trigger duration, regardless of PC resources and transfer rate.
Environmental: 0°C to 70°C (compatible with WaveBook internal environment).
User Installation: Requires main board modification for Wavebook/512 shipped before July 1998. Plug-in
compatible with Wavebook/512 shipped after July 1998.
Mechanical Mounting: Friction fit with 40-pin header. Fit with foam rubber spacers in Wavebook/512.
Power: 300 mA maximum (200 mA typical) at 5 V
Dimensions: 2.6 x 4.1 inches.