Calibration Bangladesh Weighing Balance Part 2 Guidelines on the Calibration of Non-Automatic Weighing Instruments
January 2009

Calibration Bangladesh Weighing Balance Part 2

Calibration Bangladesh Weighing Balance Part 2 CONTENTS

1 INTRODUCTION 1
2 SCOPE 1
3 TERMINOLOGY AND SYMBOLS 2
4 GENERAL ASPECTS OF THE CALIBRATION 2
4.1 Elements of the Calibration 2
4.2 Test load and indication 4
4.3 Test loads 7
4.4 Indications 9
5 MEASUREMENT METHODS 11
5.1 Repeatability test 11
5.2 Test for errors of indication 12
5.3 Eccentricity test 13
5.4 Auxiliary measurements 13
6 MEASUREMENT RESULTS 14
6.1 Repeatability 14
6.2 Errors of indication 14
6.3 Effect of eccentric loading 16
7 UNCERTAINTY OF MEASUREMENT 16
7.1 Standard uncertainty for discrete values 16
7.2 Standard uncertainty for a characteristic 24
7.3 Expanded uncertainty at calibration 34
7.4 Standard uncertainty of a weighing result 34
7.5 Expanded uncertainty of a weighing result 31
8 CALIBRATION CERTIFICATE 32
8.1 General Information 33
8.2 Information about the calibration procedure 33
8.3 Results of measurement 33
8.4 Additional information 34
9 VALUE OF MASS OR CONVENTIONAL VALUE OF MASS 34
9.1 Value of mass 35
9.2 Conventional value of mass 35
10 REFERENCES 36

APPENDICES

A ADVICE FOR ESTIMATION OF AIR DENSITY 37
A1 Formulae for the density of air 37
A2 Variations of parameters constituting the air density 39
A3 Uncertainty of air density 41
B COVERAGE FACTOR K FOR EXPANDED UNCERTAINTY OF MEASUREMENT 42
B1 Objective 42
B2 Basic conditions for the application of k = 2 42
B3 Determining k in other cases 42
C FORMULAE TO DESCRIBE ERRORS IN RELATION TO THE INDICATIONS 44
C1 Objective 44
C2 Functional relations 44
C3 Terms without relation to the readings 49
D SYMBOLS AND TERMS 50
D1 Symbols of general application 50
D2 Locations of important terms and expressions 52
E INFORMATION ON AIR BUOYANCY 54
E1 Density of standard weights 54
E2 Examples for air buoyancy in general 54
E3 Air buoyancy for weights conforming to R111 55
F EFFECTS OF CONVECTION 57
F1 Relation between temperature and time 57
F2 Change of the apparent mass 59
G EXAMPLES 61
G1 Instrument 200 g capacity, scale interval 0,1 mg 61
G2 Instrument 60 kg capacity, multi-interval 64
G3 Instrument 30 t capacity, scale interval 10 kg 71

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