Image Access WideTEK 36CL Setup Instructions page 34

Perform Setup
The white balance starts and the calibration is performed. During the white
balance, a rotating icon appears. The test target is transported forward and
returned. The entire white balance sequence takes about 18 seconds.
Then, the white balance result is displayed as shown on the example
below.
On an error-free white balance calibration, the result is displayed in
green.
An incorrect result is displayed in red. If this is the case, the white
balance starts over again.
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