Measurement Computing WaveBook rev.5.3 - Manual (Page 114)

7-6 Troubleshooting 979194 WaveBook User’s Manual - IO version
4. “Simulated Device” is the only device.
Possible Causes Details and Possible Solutions
There is no
device handle
for the
WaveBook in
the Daq
Configuration
applet.
When the simulated device is the only device that can be selected in WaveView, the problem is most
likely that there is no device handle for the WaveBook. Device handles are created in the Daq
Configuration control panel applet by the user. The applet can be accessed from the Windows desktop
by navigating from the Start menu as follows:
Start ⇒ Settings ⇒ Control Panel ⇒ Daq Configuration
Any WaveBook devices that are currently configured in this utility will appear in the list of available
devices in WaveView. Refer to Appendix A, Using the Daq Configuration Applet for details on how to
create a device handle.
5. FIFO or Buffer Over-Run Error.
Possible Causes Details and Possible Solutions
The scan rate
exceeds the
parallel port’s
throughput
capability.
If a FIFO or a Buffer-Over-Run Error exists, it is likely that the configured scan rate is too high for the
parallel port to handle. FIFO over-runs generally occur when the acquisition speed of data-samples per
second exceeds the throughput capabilities of the parallel port interface.
Once a device handle is created in the Daq Configuration utility [in the Windows Control Panel] the
hardware may be tested for communications and data transfer speeds. The test reports the data transfer
speed in samples per second and is done with full control of system resources. This establishes the best
performance. However, in real applications other system resource requirements may prevent the full
rate [as reported by the test] from actually being achieved. Generally, the data transfer rate can be
guaranteed to be at least half of the reported speed.
6. WBK modules and expansion channels are not recognized.
Possible Causes Details and Possible Solutions
The expansion
control cable or
connection is
bad.
Make sure that each expansion control cable (p/n CA-129) is connected to the proper port of the
WaveBook and associated WBK Module. The cable coming from the WaveBook must be connected to
the port labeled “Expansion Control.” The expansion control cable is connected to the “Expansion
Control In” port of the WBK Modules. Each WBK Module is equipped with an “Expansion Control
Out” port for “daisy-chain” connection to other WBK Modules. Chapter 2, System Setup and Power
Options, includes examples of system connections.
The expansion
signal cable or
connection is
bad.
Make sure that each expansion signal connection cable (p/n CA-150) is properly connected to
expansion signal BNC ports. If the cable is defective, not present, or poorly connected, the host
WaveBook won’t be able to identify the associated WBK Module’s voltage signature. Chapter 2,
System Setup and Power Options, includes examples of system connections.
There is
insufficient
power to one or
more system
components.
Proper operation is unlikely if any component of the WaveBook system is not adequately powered.
Check the power requirements for each attached WBK module and make sure that adequate power is
provided for each. Pay special attention to scenarios in which one AC adapter is shared between
multiple units. Chapter 2, System Setup and Power Options, includes power requirement tables.