Unihedron SQM-LU-DL-V, Operator'S Manual

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Table 13.5 – continued from previous page
Solution
•
Try the meter on another USB port on the computer. Sometimes certain USB ports do not
work for various software or hardware reasons.
•
Ensure that the latest FTDI USB VCP driver is installed, you can check the version number
from FTDIchip.com here:
http://ftdichip.com/Drivers/VCP.htm
•
Use the UDM software to identify found devices. The SQM-LU-DL-V device has a serial
number prefix of FT...... This may help identify what the other device is.
•
Remove any other USB devices attached to the system to troubleshoot this problem.
•
Try to reassign the SQM-LU-DL-V to another COM port using the Windows Device Manager.
For example, it the SQM-LU-DL-V is assigned to COM1, then try to assign it to a free COM
port number.
Table 13.6: USB serial number garbled
Problem USB serial number garbled in the UDM found devices box on Windows.
The serial number should look something like this: FTESKYBA
a garbled serial number looks something like this: 5&dc4a97
Cause Non FTDI device driver installed on Windows
Solution Visit the FTDI website to download and install the latest FTDI VCP USB device driver:
https://ftdichip.com/drivers/vcp-drivers/
Note that installing device drivers may affect the way other USB devices are recognized on your
computer. If you don’t mind having a garbled serial number show up in the UDM found devices
box, then just leave the device drivers alone.
Table 13.7: LED does not light up
Problem LED does not come on initially when battery pack is connected
Cause Sometimes the battery contacts become oxidized which prevents the proper voltage from reaching
the meter.
Solution Clean the battery contacts by rolling the batteries with your thumb while they are in the holder.
This will scrape off the oxide buildup.
Table 13.8: Recording stops
Problem The meter stops recording while connected to the computer
Cause Some computers, especially laptops, have the “USB suspend mode” activated which puts the USB
port to sleep when there is not enough activity on the computer.
Table continued on next page ...
Unihedron SQM-LU-DL-V Operator’s Manual -
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