Category Archives: Calibration Bangladesh

Calibration Bangladesh Weighing Balance Part 4

Calibration Bangladesh Weighing Balance Part 4. The procedure may further include rules how to derive from the results advice to the user of the instrument with regard to the errors, and assigned uncertainty of measurement, of indications which may occur under normal conditions of use of the instrument, and/or rules on how to convert an indication obtained for a weighed object into the value of mass or conventional value of mass of that object.

Calibration Bangladesh Weighing Balance Part 4 The information presented in this guideline is intended to serve, and should be observed by,

bodies accrediting laboratories for the calibration of weighing instruments,
laboratories accredited for the calibration of non-automatic weighing instruments,
testhouses, laboratories, or manufacturers using calibrated non-automatic weighing instruments for measurements relevant for the quality of production subject to QM requirements (e.g. ISO 9000 series, ISO 10012, ISO/IEC 17025).

A summary of the main terms and equations used in this document is given in Appendix D2.

1 Calibration Bangladesh Weighing Balance Part 4 TERMINOLOGY AND SYMBOLS

The terminology used in this document is mainly based on existing documents:

GUM [1] for terms related to the determination of results and the uncertainty of measurement,
OIML R111 [4] for terms related to the standard weights,
OIML R76 [2] (or EN 45501 [3]) for terms related to the functioning, to the construction, and to the metrological characterisation of non-automatic weighing
VIM [8] for terms related to the

Such terms are not explained in this document, but where they first appear, references will be indicated.

Symbols whose meaning is not self-evident, will be explained where they are first used. Those that are used in more than one section are collected in Appendix D1.

2 Calibration Bangladesh Weighing Balance Part 4 GENERAL ASPECTS OF THE CALIBRATION

Elements of the calibration

Calibration consists of

applying test loads to the instrument under specified conditions,
determining the error or variation of the indication, and
estimating the uncertainty of measurement to be attributed to the

Range of calibration

Unless requested otherwise by the client, a calibration extends over the full weighing range [3] from Zero to the maximum capacity Max . The client may specify a certain part of a weighing range, limited by a minimum load Min¢ and the largest load to be

weighed Max¢, or individual nominal loads, for which he requests calibration.

Calibration Bangladesh Weighing Balance Part 3

Calibration Bangladesh Weighing Balance Part 3 Guidelines on the Calibration of Non-Automatic Weighing Instruments

January 2009

1 Calibration Bangladesh Weighing Balance Part 3 INTRODUCTION

Non-automatic weighing instruments are widely used to determine the quantity of a load in terms of mass. While for some applications specified by national legislation, they are subject to legal metrological control – i.e. type approval, verification etc. – there is an increasing need to have their metrological quality confirmed by calibration, e.g. where required by ISO 9001 or ISO/IEC 17025 standards.

2 Calibration Bangladesh Weighing Balance Part 3 SCOPE

This document contains guidance for the static calibration of self-indicating, non- automatic weighing instruments (hereafter called “instrument”), in particular for

measurements to be performed,
calculation of the measuring results,
determination of the uncertainty of measurement,
contents of calibration

The object of the calibration is the indication provided by the instrument in response to an applied load. The results are expressed in units of mass. The value of the load indicated by the instrument will be affected by local gravity, the load’s temperature and density, and the temperature and density of the surrounding air.

The uncertainty of measurement depends significantly on properties of the calibrated instrument itself, not only on the equipment of the calibrating laboratory; it can to some extent be reduced by increasing the number of measurements performed for a calibration. This guideline does not specify lower or upper boundaries for the uncertainty of measurement.

It is up to the calibrating laboratory and the client to agree on the anticipated value of the uncertainty of measurement which is appropriate in view of the use of the instrument and in view of the cost of the calibration.

While it is not intended to present one or few uniform procedures the use of which would be obligatory, this document gives general guidance for the establishing of calibration procedures the results of which may be considered as equivalent within the SIM Member Organisations.

Calibration Bangladesh Weighing Balance Part 3

Calibration Bangladesh Weighing Balance Part 3 Any such procedure must include, for a limited number of test loads, the determination of the error of indication and of the uncertainty of measurement assigned to these errors. The test procedure should as closely as possible resemble the weighing operations that are routinely being performed by the user – e.g. weighing discrete loads, weighing continuously upwards and/or downwards, use of tare balancing function.

Calibration Bangladesh Weighing Balance Part 2

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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Calibration Bangladesh Weighing Balance Part 1

Calibration Bangladesh Weighing Balance Part 1. This archive has been created to enhance harmonization in alignment of Non-Automatic

Calibration Bangladesh

Gauging Instruments (NAWI). It offers counsel to adjustment labs to set up useful

strategies.

Calibration Bangladesh Weighing Balance Part 1 The archive contains nitty gritty models of the estimation of the vulnerability of

estimations.

EURAMET/cg-18/v.02

Creation

This archive was initially distributed by EA Committee 2 (Technical Activities), in light of a

draft of the Ad hoc Working Group “Mechanical estimations”. It is reconsidered and re-distributed

by the EURAMET Technical Committee for Mass and Related Quantities.

Official dialect

The English dialect adaptation of this distribution is the complete rendition. The EURAMET

Secretariat can offer authorization to make an interpretation of this content into different dialects, subject to certain

conditions accessible on application. If there should arise an occurrence of any irregularity between the terms of the

interpretation and the terms of this production, this distribution will win.

EURAMET e.V. 2007. It was initially distributed by EA as Guide EA-10/18. The content may not

be duplicated for resale and may not be replicated other than in full. Concentrates might be taken

just with the consent of the EURAMET Secretariat.

Direction Publications

This archive speaks to favored practice on how the applicable conditions of the accreditation

models may be connected with regards to the topic of this record. The

approaches taken are not compulsory and are for the direction alignment research facilities. The

report has been delivered as a methods for elevating a reliable way to deal with research center

accreditation.

No portrayal is made nor guarantee given that this report or the data

contained in it will be appropriate for a specific reason. In no occasion will EURAMET, the

creators or any other person associated with the production of the report be obligated for any harms

at all emerging out of the utilization of the data contained in this.

Additional data

For additional data about this distribution, contact your National individual from the EURAMET

Calibration Bangladesh Weighing Balance Part 1 Specialized Committee for Mass and Related Quantities (see www.euramet.org).

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