1、STD.BSI BS EN 12544-1-ENGL 1999 1624669 0839930 232 I BRITISH STANDARD Non-des truc tive testing - Measurement and evaluation of the X-ray tube voltage - Part 1: Voltage divider method The European Standard EN 12544-1:1999 has the status of a British Standard ICs 19.100 NO COPYING WITHOUT BSI PERMIS
2、SION EXCEPT AS PERMITTED BY COPYRIGHT LAW I BS EN 125 - present to the responsible European committee any enquiries on the intepretation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK. A list of or
3、ganizations represented on this committee can be obained on request to its secretary. Cross-references The British Standards which implement intemational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitied ”Intemational Standar
4、ds Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include a31 the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard
5、 does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright notice dtsplayed in this document indicates when the document was last issued. ISBN O 580 351
6、69 6 - STD-BSI BS EN 12544-1-ENGL L999 1b24bb9 D19932 O95 I EUROPEAN STANDARD NORME EUROPENNE EROPaSCHE NORM EN 12544-1 September 1999 ICs 19,100 English version Non destructive testing - Measurement and evaluation of the X-ray tube voltage - Part I : Voltage divider method Essais non destructifs -
7、Mesurage et valuation de la tension des tubes radiognes - Partie 1: Mthode par deviseur de tension Zerstrungsfreie Prfung - Messung und Auswertung der Rntgenrhrenspannung - Teil 1 : Spannungsteiler- Verfahren This European Standard was approved by CEN on 16 August 1999. CEN members are bound to comp
8、ly with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards may be obtained on application to the Central Sec
9、retariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by traislation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as he ofic
10、ial versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic. Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT
11、EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 8-1050 Brussels Q 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12544-1:1999 E Page 2 EN 12!544-1:1999 Contents Page Foreword 3
12、 Introduction , . _. . . . . 4 1 Scope . 4 2 Principle 4 3 Measurement 5 4 Test report 5 O BSI 12-1999 Page 3 EN 12544-1:1999 Foreword This European Standard has been prepared by Technical Committee CEN/TC 138 “Nondestructive testing“, the Secretariat of which is held by AFNOR. This European Standar
13、d shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2000, and conflicting national standards shall be withdrawn at the latest by March 2000. According to the CENICENELEC Internal Regulations, the national standards
14、organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. In the framework
15、 of its scope, Technical Committee CEN/TC 138 entrusted CEN/TC 138MIG 1 “Ionizing Radiation“ with preparing the following standard: EN 12544-1, Non-destructive testing - Measurement and evaluation of the X-ray tube voltage - Part 7: Voltage divider method. EN 12544-1 is a part of series of European
16、Standards; the other parts are the following: EN 12544-2, Non-destructive testing - Measurement and evaluation of the X-ray tube voltage - Part 2: Constancy check by the thick filter method EN 12544-3, Non-destructive testing - Measurement and evaluation of the X-ray tube voltage - Part 3: Spectrome
17、tric method. O BSI 12-1999 Page 4 EN 12544-1:1999 Introduction In order to cover the different requirements for the measurement of the X-ray tube voltage, three different methods are described in EN 12544-1 to EN 12544-3. The voltage divider method (EN 12544-1) enables a direct and absolute measurem
18、ent of the average high voltage of constant potential X-ray systems on the secondary side of the high voltage generator. The thick filter method (EN 12544-2) describes a constancy check. This method is recommended for the regular stabiliiy check of an X-ray system. The spectrometric method (EN 12544
19、-3) is a procedure for non-invasive measurement of the X-ray tube voltage using the energy spectrum of the X-rays. This method can be applied for all X-ray systems and is the recommended method whenever the voltage divider method is not applicable, e. g. in case of tank units where it is not possibl
20、e to connect the voltage divider device. 1 Scope This European Standard specifies a method for the direct and absolute measurement of the average high voltage of constant potential (DC) X-ray systems on the secondary side of the high voltage generator. The intention is to check the correspondence wi
21、th t,he indicated high voltage value on the control unit of the X-ray system. This method is applied to assure a reproducible operation of X-ray systems because the voltage influences particularly the penetration of materials and the contrast of X-ray images and also the requirements concerning the
22、radiation protection. 2 Principle The principle of the voltage divider method is presented in figure 1 : I 1 1 From generator 2 To X-ray tube 3 Analog exit Figure I - Scheme of the voltage divider O BSI 12-1999 STD-BSI BS EN 12544-1-ENGL 2999 LbZ4bb 0819736 730 m Page 5 EN 12544-1 1 A999 The voltage
23、 divider system consists of: - a box with two high voltage connectors; - a resistor chain Ri, RP; - an analog exit for the voltage drop at R2; - a measuring device, e.g. a voltmeter or an oscilloscope. The value of the resistors should be chosen for a current of less than 10 % of the actual tube cur
24、rent. The resistor chain shall have a temperature coefficient of I 50 x IO“/C in relation to the resistor value. The output voltage across the resistor or 3 % for general radiographic and radioscopic applications. b) 3 Measurement For measuring purposes the measuring device is connected between the
25、high voltage generator and the X-ray tube. The high voltage is devided by means of the resistor chain, presented as i$ and R2 in figure 1, and the drop voltage is measured at R2 using a voltmeter or an oscilloscope. 4 Testreport The test report shall contain at least the following details: the X-ray
26、 system with type and serial number; the working conditions of the X-ray system, e.g. tube current, tube voltage, temperature; the accuracy of the measuring device; the date of measurement; a table with the result(s) and a comparison between the actual and the indicated values; name and signature of
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