1、BRITISH STANDARDBS EN ISO 17657-4:2007Incorporating amendment no. 1 (renumbers BS ISO 17657-4:2005 as BS EN ISO 17657-4:2007)Resistance welding Welding current measurement for resistance welding Part 4: Calibration systemThe European Standard EN ISO 17657-4:2007 has the status of a British StandardI
2、CS 25.160.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 17657-4:2007This British Standard was published under the authority of the Sta
3、ndards Policy and Strategy Committee on 19 January 2006 BSI 2007ISBN 978 0 580 59707 7National forewordThis British Standard is the UK implementation of EN ISO 17657-4:2007. It is identical with ISO 17657-4:2005.The UK participation in its preparation was entrusted to Technical Committee WEE/29, Res
4、istance welding. A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot con
5、fer immunity from legal obligations.Amendments issued since publicationAmd. No. Date Comments17299 31 August 2007 Renumbers BS ISO 17657-4:2005 as BS EN ISO 17657-4:2007EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 17657-4June 2007ICS 25.160.10English VersionResistance welding - Welding curr
6、ent measurement forresistance welding - Part 4: Calibration system (ISO 17657-4:2005)Soudage par rsistance - Mesurage des courants ensoudage par rsistance - Partie 4: Systme dtalonnage(ISO 17657-4:2005)Widerstandsschweien - Schweistrommessung fr dasWiderstandsschweien - Teil 4: Kalibriersystem (ISO1
7、7657-4:2005)This European Standard was approved by CEN on 19 May 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographic
8、al references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN me
9、mber into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, L
10、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brusse
11、ls 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 17657-4:2007: EForeword The text of ISO 17657-4:2005 has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” of the International Organization for
12、Standardization (ISO) and has been taken over as EN ISO 17657-4:2007 by Technical Committee CEN/TC 121 “Welding“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the lat
13、est by December 2007, and conflicting national standards shall be withdrawn at the latest by December 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cy
14、prus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 1765
15、7-4:2005 has been approved by CEN as a EN ISO 17657-4:2007 without any modification. EN ISO 17657-4:2007Reference numberISO 17657-4:2005(E)INTERNATIONAL STANDARD ISO17657-4First edition2005-09-15Resistance welding Welding current measurement for resistance welding Part 4: Calibration system Soudage
16、par rsistance Mesurage des courants en soudage par rsistance Partie 4: Systme dtalonnage EN ISO 17657-4:2007ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Construction of calibration system 2 4.1 Reference welding current measuring
17、system 2 4.2 Test set-up. 2 4.3 Basic feature for calibration of welding current measuring system . 2 4.4 Basic feature for calibration of current sensor .4 4.5 Basic feature for calibration of welding current meter without sensor 5 5 Physical environment and operating conditions 6 6 Calibration req
18、uirements . 6 6.1 Reference welding current measuring system 6 6.2 Reference current sensor 6 6.3 Data acquisition device 7 6.4 Test stage and power sources 7 7 Test report . 7 7.1 Test report for calibration of welding current measuring systems. 7 7.2 Test report for calibration of current sensors
19、. 8 7.3 Test report for calibration of welding current meters without sensors 8 8 Test procedure 9 8.1 General. 9 8.2 Calibration of welding current measuring system 9 8.3 Calibration of current sensor 10 8.4 Calibration of welding current meter without sensor . 10 8.5 Special calibration cases . 10
20、 Annex A (informative) Measuring set-up . 12 Annex B (informative) Items to be recorded or filed as reference documentation for calibration 17 Annex C (informative) Examples of the test report in accordance with this part of ISO 17657 . 19 EN ISO 17657-4:2007iv Foreword ISO (the International Organi
21、zation for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been establishe
22、d has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
23、International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Pub
24、lication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent
25、 rights. ISO 17657-4 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 6, Resistance welding. ISO 17657 consists of the following parts, under the general title Resistance welding Welding current measurement for resistance welding: Part 1: Guidelines for me
26、asurement Part 2: Welding current meter with current sensing coil Part 3: Current sensing coil Part 4: Calibration system Part 5: Verification of welding current measuring system EN ISO 17657-4:2007vIntroduction Requests for official interpretations of any aspect of this part of ISO 17657 should be
27、directed to the Secretariat of ISO/TC 44/SC 6 via your national standards body. A complete listing of these bodies can be found at http:/www.iso.org. EN ISO 17657-4:2007blank1Resistance welding Welding current measurement for resistance welding Part 4: Calibration system 1 Scope This part of ISO 176
28、57 specifies calibration systems and calibration procedures for welding current measuring systems, current sensors, welding current meters and monitoring devices with current sensor used for measuring welding current in resistance welding with alternating current of 50 Hz or 60 Hz, or with direct cu
29、rrent. The procedures are applicable for a current range between 0,5 kA and 25 kA. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the
30、 referenced document (including any amendments) applies. ISO 669, Resistance welding Resistance welding equipment Mechanical and electrical requirements ISO 17657-2, Resistance welding Welding current measurement for resistance welding Part 2: Welding current meter with current sensing coil ISO 1765
31、7-3:2005, Resistance welding Welding current measurement for resistance welding Part 3: Current sensing coil 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 669 and the following apply. 3.1 test (current) sensor current sensor to be calibrated 3.2 re
32、ference (current) sensor current sensor calibrated in highly accurate condition, used for calibration of current sensors 3.3 test welding current meter welding current meter to be calibrated EN ISO 17657-4:20072 3.4 non-inductive shunt high precision and low value resistance with a very low inductiv
33、e component 3.5 analog-to-digital converter ADC device to convert analog input signals into digital signals 3.6 data acquisition device instrument or device used to acquire analog data, which tracks changes in physical variables such as voltage, current and temperature 3.7 measuring accuracy of refe
34、rence welding current measuring system sum of measuring accuracy values of each component calibrated by a certified reference equipment (e.g. reference sensor, integrator, ADC etc.) 4 Construction of calibration system 4.1 Reference welding current measuring system Components of a reference welding
35、current measuring system shall be calibrated by certified reference equipment in accordance with Clause 6. The reference welding current measuring system consists of a calibrated current sensor, a data acquisition system and a display unit or a recorder. 4.2 Test set-up The test set-up consists of a
36、 test stage or an appropriate circuit for conducting high current, and a power source with a current control unit for supplying a test current. All signal cables shall be twisted and shielded. The cable resistance shall be very small and negligible compared to the impedance of the current sensor. Ty
37、pical examples of the test set-up are shown in Annex A. NOTE A resistance welding machine/transformer can be used as a test set-up. 4.3 Basic feature for calibration of welding current measuring system A welding current meter with a current sensor should be calibrated in a set consisting of the mete
38、r and the sensor. Calibration systems for a welding current meter with its sensor consist of a test set-up, a reference welding current measuring system and the welding current measuring system to be tested. The function of a reference welding current meter can be replaced with a calibrated data acq
39、uisition device. Figure 1 shows the basic features required for calibration of welding current measuring system. EN ISO 17657-4:20073a) b) Key 1 reference welding current measuring system 2 reference sensor 3 test sensor 4 alternating current or direct current power source 5 secondary circuit 6 test
40、 welding current meter 7 reference welding current meter 8 test set-up 9 data acquisition device Figure 1 Basic feature for calibration of welding current measuring system EN ISO 17657-4:20074 4.4 Basic feature for calibration of current sensor A calibration system for a current sensor consists of a
41、 test set-up, a reference welding current measuring system and a calibrated data acquisition device connected to the current sensor to be tested. The function of the reference welding current meter can be replaced by using another channel of the data acquisition device. Figure 2 shows the basic feat
42、ure required for the calibration of current sensor. a) b) Key 1 reference welding current measuring system 2 reference sensor 3 test sensor 4 alternating current power source 5 secondary circuit 6 data acquisition device 7 reference welding current meter 8 data acquisition device Figure 2 Basic feat
43、ure for the calibration of current sensor EN ISO 17657-4:200754.5 Basic feature for calibration of welding current meter without sensor A calibration system for a welding current meter of the high-impedance integrator type without current sensor consists of a calibrated data acquisition device of th
44、e high-input-impedance integrator type, a calibrated reference sensor, and the test welding current meter. See Figure 3 a). The welding current meter to be tested is connected to the same output port of the reference current sensor. The data acquisition device shall not be replaced by a reference we
45、lding current meter of the low-impedance integrator type. For calibration of a welding current meter with the low impedance integrator unit, and when two reference coils are used for the calibration, the calibration system shall consist of a calibrated reference welding current measuring system and
46、a calibrated second reference sensor connected to the welding current meter to be tested. See Figure 3 b). a) b) Key 1 reference welding current measuring system 2 reference sensor 3 second reference sensor 4 alternating current or direct current power source 5 secondary circuit 6 test welding curre
47、nt meter 7 reference welding current meter 8 data acquisition device Figure 3 Basic feature for calibration of welding current meter without sensor EN ISO 17657-4:20076 5 Physical environment and operating conditions Unless otherwise specified, the calibration system shall be capable of operating un
48、der the following conditions without any adverse effect on its accuracy. Any deviation from these conditions shall be agreed upon between the test laboratory and the client. at an ambient air temperature between +5 C and +40 C; in relative humidity up to 95 %; at altitudes up to 1 000 m above mean s
49、ea level. 6 Calibration requirements 6.1 Reference welding current measuring system Components of the reference welding current measuring system shall be calibrated by using certified reference equipment at least once a year. The total measuring accuracy is defined as the sum of measuring accuracy of each component of the reference welding current measuring system and shall be better than that stipulated for the highly accurate class stipulated in ISO 17657-2. The specification, name of certifying test body and rele
