MA 58 Calibration Error "Maximum Zero Reflectance Exceeded"

If the MA 58 instrument reports the error message "Maximum Zero Reflectance Exceeded", the black glass calibration tile must be thoroughly cleaned. Thoroughly clean the black reference tile with a damp (water only) lint free cloth and then dry thoroughly with a dry lint free cloth. If more aggressive cleaning is required, iospropyl alcohol may be used instead of water.

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