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1、JIS JAPANESE I N DU STR IAL STANDARD Translated and Published by Japanese Standards Association Calibration of force-proving instruments used for the verification of uniaxial testing machines ICs 19.060; 77.040.10 Reference number : JIS B 7728 : 2002 (E) PROTECTED BY COPYRIGHT 14 S Copyright Japanes
2、e Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:26:15 MDTNo reproduction or networking permitted without license from IHS -,-,- B 7728 : 2002 Foreword This translation has been made based on the original
3、 Japanese Industrial Standard revised by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial Standard submitted by the Japan Testing Machinery Association (JTM) with the draft
4、being attached, based on the provision of Article 12 Clause 1 of the Industrial Standardization Law applicable to the case of revision by the provision of Article 14. Consequently JIS B 7728:1997 is replaced with this Standard. Date of Establishment: 1955-04-14 Date of Revision: 2002-06-20 Date of P
5、ublic Notice in Official Gazette: 2002-06-20 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Testing and Measurement Technology JIS B 7728: 2002, Second English edition published in 2003-12 Translated and published by: Japanese Standards Association 4-
6、1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. Q JSA 2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ele
7、ctronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 0
8、3/15/2007 19:26:15 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS B 7728 : 2002 Contents Page Introduction 1 . 1 Scope 1 2 Normativereferences 1 . . 3 Principle 1 4 2 4.1 Identification of the force-proving instrument * - - * - * - - * * - - * * - - * * * * * * * * 2 4
9、.2 Application of force 2 4.3 Measurement of deflection 2 Characteristics of force-proving instruments * * - * - * - - * - * - * - - - - * - - * * - * * - * * 5 Symbols, units and designations 2 6 3 6.1 General 3 6.2 Resolution ofthe indicator 4 6.3 Minimum force 4 6.4 Calibration 4 6.5 Assessment o
10、f the force-proving instrument * * * - * * * - - * * * . * *. * - * * * * * * * - * -. 6 7 Classification of the force-proving instrument - - * * * - * - * - - - - - - - - - - * - - - 7 7.1 principle of cassiflcation 7 7.2 Classification criteria 7 7.3 Calibration certificate and duration of validit
11、y - * - - - * * * * - * - * - - * * * * * * * * * * * * * * 8 8 Use of calibrated force-proving instruments * * * * - - - * * * - * * * - * * * * * * * * * * * * * * * * 8 Annex A (informative) 10 A.1 Tensile force transducers 10 A.2 Compressive force transducers 10 A.3 Loading fittings 11 Calibrati
12、on of the force-proving instrument - - - - * - * - - * - - - - - - - - * . * - - - - - - - - . . Example of dimensions of force transducers and corresponding loading fittings * * - - - - - - * * - * * * - * * * - - - * . Annex B (informative) Additional information - - - - * - * - - * - - - - - * -
13、* - - - * - * - * - * * 17 B. 1 Overloading test 17 B.2 Example of a method of verifying that there is no interaction between the force transducer of an instrument used in compression and its support the machine 17 B.3 Temperature corrections of calibrated force-proving instruments * * * * - - - - -
14、 * - * 18 Annex 1 (informative) Comparison table between JIS and corresponding International Standard 21 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:26:15 MDTN
15、o reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 7728 : 2002 Calibration of force-proving instruments used for the verification of uniaxial testing machnnes Introduction This Japanese Industrial Standard has been prepared based on the sec- ond
16、edition of IS0 376 : 1999 Metallic materials-Calibration of force-proving instru- ments used for the verification of uniaxial testing machines published in 1999 without modifying the technical contents. A JIS standard is added to Normative references. The portions with dotted underlines in this Stan
17、dard are the matters not included in the original International Standard. 1 Scope This Standard covers the calibration of force-proving instruments used for the static verification of uniaxial testing machines (e.g. tensioncompression testing ma- chines) and describes a procedure for classifying the
18、se instruments. A force-proving instrument is defined as being the whole assembly from the force transducer through to and including the indicator. This Standard generally applies to force-proving instru- ments in which the force is determined by measuring the elastic deformation of a loaded member
19、or a quantity which is proportional to it. Remarks : The International Standard corresponding to this Standard is as follows: In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NE
20、Q (not equivalent) according to ISO/IEC Guide 21. IS0 376 : 1999 Metallic materials - Calibration of force-proving instruments used for the verrfication of uniaxial testing machines (MOD) 2 Normative references The following standards contain provisions which, through reference in this Standard, con
21、stitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied. JIS B 7721 Verifkation and calibration of the force measuring system of the ten- siodcompression testing machines Remarks : IS0 7500-1 : 1999 Metallic materials- Ve
22、rification of static uniaxial testing machines -Part 1 : Tensioncompression testing machines -Veri- fication and calibration of the force-measuring system is equivalent to the said standard. 3 Principle Calibration consists of applying precisely-known forces to the loaded member and recording the da
23、ta from the deflection measuring system, which is consid- ered an integral part of the force-proving instrument. When an electrical measurement is made, the indicator may be replaced by another PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALice
24、nsee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:26:15 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 B 7728 : 2002 indicator and the force-proving instrument need not be recalibrated provided the fol- lowing conditions are fulfilled. a) The
25、 original and replacement indicators have calibration certificates traceable to national standards which give the results of calibration in terms of electrical base units (volt, ampere). The replacement indicator shall be calibrated over a range equal to or greater than the range for which it is use
26、d with the force-proving in- strument and the resolution of the indicator shall be at least equal to the resolution of the indicator when it is used with the force-proving instrument. The units and excitation source of the replacement indicator should be respectively of the same quantity (e.g. 5 V,
27、10 V) and type (e.g. AC or DC carrier frequency). The uncertainty of each indicator (both the original and the replacement indica- tors) shall not influence the uncertainty of the whole assembly of the force-proving instrument. It is recommended that the uncertainty of the replacement indicator shou
28、ld be no greater than 1/3 of the uncertainty of the entire system. b) c) 4 Characteristics of force-proving instruments 4.1 Al1 the elements of the force- proving instrument (including the cables for electrical connection) shall be individually and uniquely identified, e.g. by the name of the manufa
29、cturer, the model and the serial number. Identification of the force-proving instrument For the force transducer, the maximum working force shall be indicated. 4.2 Application of force The force transducer and its loading fittings shall be des- igned so as to ensure axial application of force, wheth
30、er in tension or compression. Examples of loading fittings such as loading pads are given in Annex A. 4.3 Measurement of deflection Measurement of the deflection of the loaded member of the force transducer may be carried out by mechanical, electrical, optical or other means with adequate accuracy a
31、nd stability. The type and the quality (uncertainty in measurement) of the deflection measuring system determine whether the force-proving instrument is classified only for specific calibration forces or for interpolation (see clause 7 ) . Generally, the use of force-proving instruments with dial ga
32、uges as a means of measuring the deflection is limited to the forces for which the instruments have been calibrated. The dial gauge, if used over a long travel, may contain large localised peri- odic errors which produce an uncertainty too great to permit interpolation between cali- bration forces.
33、The dial gauge may be used for interpolation if its periodic error has a negligible influence on the interpolation error of the force-proving instrument. 5 Symbols, units and designations For the purpose of this Standard, the_tetms_and- dejinitions-i-nJIS-Z-8103 and the symbols, units and designatio
34、ns given in Table 1 shall apply. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:26:15 MDTNo reproduction or networking permitted without license from IHS -,-,- 3
35、3 7728 : 2002 Table 1 Symbols, units and designations Designation Maximum capacity of the measuring range Maximum capacity of the transducer Reading ( I ) on the indicator before application of force Reading ( I ) on the indicator after removal of force Deflection with increasing test force Deflecti
36、on with decreasing test force Average value of the deflections with rotation Average value of deflections without rotation Maximum deflection Minimum deflection Computed value of deflection by calibration formula Deflection corresponding to the maximum capacity Relative reproducibility error with ro
37、tation Relative repeatability error without rotation Relative zero error Relative interpolation error Resolution of the indicator Relative reversibility error of the force-proving instrument (I) Reading value corresponding to the deflection. 6 Calibration of the force-proving instrument 6.1 General
38、Before undertaking the calibration of the force-proving instrument, en- sure that this instrument is able to be calibrated. This can be done by means of pre- liminary tests such as those defined below and given as examples. 6.1.1 Overloading test This optional test is described in Annex B.l. 6.1.2 V
39、erification relating to application of forces Ensure - that the attachment system of the force-proving instrument allows axial application of the force when the instrument is used for tensile testing; - that there is no interaction between the force transducer and its support on the cali- bration ma
40、chine when the instrument is used for compression testing, see Annex B.2. Note : Other methods can be used, e.g. a method using a flat-based transducer with a spherical button or upper bearing surface. 6.1.3 Variable voltage test This test is left to the discretion of the calibration service. For fo
41、rce-proving instruments requiring an electrical supply, verify that a variation of -+ 10 % of the line voltage has no significant effect. This verification can be carried out by means of a force transducer (e.g. bridge calibrator) simulator or by another appropri- ate method. PROTECTED BY COPYRIGHT
42、Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:26:15 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 B 7728 : 2002 6 . 2 Resolution of the indicator 6 . 2 .
43、1 Analogue scale The thickness of the graduation marks on the scale shall be uniform and the width of the pointer shall be approximately equal to the width of a graduation mark. The resolution (I) of the indicator shall be obtained from the ratio between the width of the pointer and the centre-to-ce
44、ntre distance between two adjacent scale graduation marks (scale interval), the recommended ratios being 12, 115 or 1/10, a spacing of 1.25 mm or greater being required for the estimation of a tenth of the division on the scale. A vernier scale of dimensions appropriate to the analogue scale may be
45、used to al- low direct fractional reading of the instrument scale division. 6 . 2 . 2 Digital scale The resolution is considered to be one increment of the last active number on the numerical indicator, provided that the indication does not fluctuate by more than one increment with no force applied
46、to the instrument. 6 . 2 . 3 If the readings fluctuate by more than the value previ- ously calculated for the resolution (with no force applied to the instrument), the resolu- tion shall be deemed to be equal to half the range of fluctuation. Variation of readings 6 . 2 . 4 Units “he resolution (r)
47、shall be converted to units of force. 6 . 3 Minimum force Taking into consideration the accuracy with which the deflection of the instrument may be read during calibration or during its subsequent use for veri- fying machines, the minimum force applied to a force-proving instrument shall comply with
48、 the two following conditions: a) the minimum force shall be greater than or equal to: - 4 O00 XI for class O0 - 2 O00 X r for class 0.5 - 1 O00 X r for class 1 - 500 X I for class 2 b) the minimum force shall be greater than or equal to 0.02 Fp 6.4 Calibration procedure 6 . 4 . 1 Preloading Before
49、the calibration forces are applied, in a given mode (tension or compression), the maximum force shall be applied to the instrument three times. The duration of the application of each preload shall be between 1 min and 1.5 min. 6 . 4 . 2 The calibration shall be carried out by applying two series of calibra- tion forces to the force-p