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6
Troubleshooting
Section 6 – Troubleshooting
6.1 Basic Checklist
Power – Check USB cable connection. The green "PWR IND" LED should be lit
on the DAQ device. If using a powered USB hub, make sure its power cable is
plugged in.
Signal – Check signal lines and connections. Connectors must be free of
corrosion. Signal lines should be undamaged and free of sharp bends and
twists. Signal paths should avoid potential sources of noise (high voltage and
electromagnetic interference).
Device Selection – Make sure the serial number selected in the software
matches the serial number of your device. Each data display will show the
serial number (or Nickname, if assigned) of the device it is currently displaying.
"DAQ2401DEMO" is a software demo device which outputs a sine wave.
Software Updates – A software update may be available. In DAQ Central,
choose "Check For Updates" from the Help Menu on an Internet-connected PC.
6.2 Symptoms and Solutions
USB drivers are not found or hardware installation fails. This can happen if the
device is plugged into the computer's USB port before software installation is
complete. The program "C:\Program Files\Omega\DAQ Central\USB Drivers\
CDM20814_Setup.exe" can be run to reinstall the USB drivers. All non-critical
USB devices should be unplugged while this program runs, including all DAQ
devices.
The "20814" portion of this filename may be different, and the "DAQ Central\
USB Drivers" directory may be in a different location if an alternate directory
was chosen during installation.
Data does not appear or data does not make sense. See "Device Selection"
under Basic Checklist.
Stop the acquisition and check the Triggers tab of the Device Configuration
window. A trigger may be set to start acquisition at a future date. Try setting
both Start and Stop triggers to manual and restarting acquisition.
The Device Configuration screen is grayed out. A data acquisition may be
running. A device's configuration can not be edited during acquisition.
The waveform scale is too small/large The vertical scale can be adjusted by
clicking the max and min values on the y-axis. The horizontal scale can be adjusted
from the Waveform Options screen, which is accessed by clicking the Options
button at the top of the Waveform window. The "Scans to graph" setting determines
how many data points (scans) will appear along the x-axis. A higher number shows
a greater span of time, but uses more of the PC's RAM and may slow it down.
The main DAQ Central window does not respond. A configuration window
may be open. Configuration windows must be closed before continuing to
interact with the software. Check your desktop and Windows taskbar for a
Device Configuration window or an Options window.
The device does not appear in the device list. Select "Detect Devices" from the
Device menu to re-scan for connected devices. See also "Power" under "Basic
Checklist" and "USB drivers..." in this section.
Thermocouple inputs are noisy. If you experience noise from thermocouple
wires, you can connect a 100K resistor from AxL to COM to eliminate some noise.
6-1
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