Nulling the 301

How to Zero or Null a 301 densitometer before using it for density readings.Calibrating (Nulling) the 301

When the instrument is first turned on it must be zeroed (nulled) before taking measurements. To perform this task proceed as follows:

Nulling the instrument

 Calibrating / Setting the instrument's slope

NOTE:  If the unit does not read zero after several attempts at nulling, and the light source has been verified, there is an internal failure and the unit must be returned for repair.   It is recommended that the calibration / verification be performed once a week. More frequent verification can be performed if required by local regulations.

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