
BF5 User Manual v 2.3
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It is possible to recalibrate the BF5 yourself against a transfer standard
sensor, but this is difficult and not recommended.
You will need stable sunlight or a stable sunlight simulator.
Natural atmospheric turbulence can cause rapid variations in sunlight
intensity, which, if greater than the quoted accuracy of the BF5, could
make it impossible to recalibrate in sunshine.