13 Troubleshooting
Table 13.1: Reading seem too bright
Problem
The meter reads values that are brighter than expected.
Cause
The IR filter may have fallen out of the lens.
Solution
Ensure that there are no extra sources of visible light in the field of view of the meter.
Inspect lens for IR filter. You should see a light blue colour inside the lens.
Table 13.2: Reading is 0.00mpsas
Problem
The meter reads values of 0mpsas.
Cause
In bright light over about 6mpsas (even indoors) the meter saturates and will produce a reading
of 0mpsas.
Solution
Test the meter in a darker setting or place a cover over the meter while doing indoor testing.
Note: in complete darkness (like a photo-darkroom), the meter may timeout and also produce
strange readings.
Table 13.3: Cannot Find UDM software
Problem
Microsoft Edge cannot find UDM software on the CD. Error “Can’t reach this page”.
Cause
Microsoft Edge has protections in place to hide file lists on remote drives.
Solution
Use the File Manager to navigate the CD to the Windows directory then install from there. Or,
get the latest Windows version of UDM from the Unihedron website:
unihedron.com/projects/darksky/cd/Windows/
Table 13.4: Driver not found
Problem
USB driver not found
Cause
Some operating systems may not have the FTDI VCP USB driver installed by default.
Solution
You can get the most updated driver for your operating system from FTDIchip.com here:
//ftdichip.com/Drivers/VCP.htm
Table 13.5: USB device not found, or more than one device on the same COM port
Problem
USB device not found, or more than one device on the same COM port
Cause
Faulty USB software driver, or faulty USB hardware port on computer
Table continued on next page ...
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Summary of Contents for SQM-LU-DL-V
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