Annex B - Class of Instruments and Recommended Tolerances

Annex B.1
Classes of Instrument
 

Class Scale Interval Minimum Number of Scales Intervals Maximum Number of Scale Intervals
II 0.001g to 0.05g 100 100,000
II 0.1g or greater 5,000 100,000
III 0.1g to 2g 100 10,000
III 5g or greater 500 10,000
IIII 5g or greater 100 1,000

Taken from OIML R76-1 Edition 2006 (E)

Annex B.2
Recommended Tolerances

Class II Instruments

Load = Zero to 5,000 Divisions 5,000 to 20,000 Divisions Above 20,000 Divisions
Initial Calibration Allowance + 1/2 Division + 1 Division + 11/2 Division
Subsequent Calibration Allowance + 1 Division + 2 Divisions + 3 Divisions

Class III Instruments

Load = Zero to 5,000 Divisions 500 to 2,000 Divisions Above 2,000 Divisions
Initial Calibration Allowance + 1/2 Division + 1 Division + 11/2 Division
Subsequent Calibration Allowance + 1 Division + 2 Divisions + 3 Divisions

Class IIII Instruments

Load = Zero to 50 Divisions 50 to 200 Divisions Above 200 Divisions
Initial Calibration Allowance + 1/2 Division + 1 Division + 11/2 Division
Subsequent Calibration Allowance + 1 Division + 2 Divisions + 3 Divisions

Repeatability Testing:  Indications must not vary by more than the absolute value of the
tolerances given above.

NOTE:  These tolerances are based on maximum permissible errors specified in OIML R76-1 Edition 2006 (E) Customers may specify tolerances differing from these recommendations.


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