1、BS EN12668-1:2010ICS 19.100NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDNon-destructive testing Characterizationand verification ofultrasonic examinationequipmentPart 1: InstrumentsThis British Standardwas published under theauthority of the StandardsPolicy a
2、nd StrategyCommittee on 28 February2010 BSI 2010ISBN 978 0 580 58073 4Amendments/corrigenda issued since publicationDate CommentsBS EN 12668-1:2010National forewordThis British Standard is the UK implementation of EN 12668-1:2010. Itsupersedes BS EN 12668-1:2000 which is withdrawn.The UK participati
3、on in its preparation was entrusted to TechnicalCommittee WEE/46, Non-destructive testing.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for
4、 its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 12668-1:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12668-1 February 2010 ICS 19.100 Supersedes EN 12668-1:2000English Version Non-destructive testing - Characterization and ve
5、rification of ultrasonic examination equipment - Part 1: Instruments Essais non destructifs - Caractrisation et vrification de lappareillage de contrle par ultrasons - Partie 1 : Appareils Zerstrungsfreie Prfung - Charakterisierung und Verifizierung der Ultraschall-Prfausrstung - Teil 1: Prfgerte Th
6、is European Standard was approved by CEN on 25 December 2009. CEN members are bound to comply with the CEN/CENELEC 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 refe
7、rences concerning such national standards 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 translation under the responsibility of a CEN member
8、 into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
9、Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-
10、1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12668-1:2010: EBS EN 12668-1:2010EN 12668-1:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Symbols 75 General requi
11、rements for compliance .86 Manufacturers technical specification for ultrasonic instruments96.1 General 96.2 General attributes 96.3 Display 96.4 Transmitter 106.5 Receiver and attenuator . 106.6 Monitor output . 116.7 Additional information . 117 Performance requirements for ultrasonic instruments
12、118 Group 1 tests . 138.1 Equipment required for group 1 tests 138.2 Stability against temperature 148.3 Stability against voltage variation . 168.4 Transmitter pulse parameters . 168.5 Receiver . 188.6 Monitor gate 218.7 Monitor gates with proportional output 228.8 Digital ultrasonic instruments .
13、269 Group 2 tests . 279.1 Equipment required for group 2 tests 279.2 Physical state and external aspects . 289.3 Stability 289.4 Transmitter pulse parameters . 299.5 Receiver . 309.6 Linearity of time-base . 32Annex A (normative) Special conditions for ultrasonic instruments with logarithmic amplifi
14、ers . 44A.1 Introduction . 44A.2 Basic requirements. 44A.2.1 Measuring accuracy . 44A.2.2 Vertical display “linearity“ . 44A.3 Tests . 44Bibliography . 45BS EN 12668-1:2010EN 12668-1:2010 (E) 3 Foreword This document (EN 12668-1:2010) has been prepared by Technical Committee CEN/TC 138 “Non-destruct
15、ive testing”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2010, and conflicting national standards shall be withdrawn at the latest by August
16、2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12668-1:2000. EN 12668, Non-destructive testing Char
17、acterization and verification of ultrasonic examination equipment, consists of the following parts: Part 1: Instruments Part 2: Probes Part 3: Combined equipment According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement
18、this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, 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, Switzerl
19、and and the United Kingdom. BS EN 12668-1:2010EN 12668-1:2010 (E) 4 1 Scope This European Standard specifies methods and acceptance criteria for assessing the electrical performance of analogue and digital ultrasonic instruments for pulse operation using A-scan display, employed for manual ultrasoni
20、c non-destructive examination with single or dual-element probes operating within the centre frequency range 0,5 MHz to 15 MHz. Ultrasonic instruments for continuous waves are not included in this standard. This standard may partly be applicable to ultrasonic instruments in automated systems but the
21、n other tests can be needed to ensure satisfactory performance. 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 referenced documen
22、t (including any amendments) applies. EN 1330-4:2010, Non-destructive testing Terminology Part 4: Terms used in ultrasonic testing EN 12668-3, Non-destructive testing Characterization and verification of ultrasonic examination equipment Part 3: Combined equipment 3 Terms and definitions For the purp
23、oses of this document, the terms and definitions given in EN 1330-4:2010 and the following apply. 3.1 amplifier frequency response variation of the gain of an amplifier versus frequency NOTE It is usually specified by a plot of gain (normalized to the peak gain value) versus frequency. 3.2 amplifier
24、 bandwidth width of the frequency spectrum between the high and low cut-off frequencies NOTE This standard uses as limits the points at which the gain is 3 dB below the peak value. 3.3 cross-talk during transmission amount of energy transfer from the transmitter output to the receiver input during t
25、he transmission pulse, with the ultrasonic instrument set for dual-element probe (separate transmitter and receiver) 3.4 calibrated dB-switch device controlling the overall gain of the ultrasonic instrument calibrated in decibels 3.5 dead time after transmitter pulse time interval following the star
26、t of the transmitter pulse during which the amplifier is unable to respond to incoming signals, when using the pulse echo method, because of saturation by the transmitter pulse 3.6 digitisation sampling error error introduced into the displayed amplitude of an input signal by the periodic nature of
27、measurements taken by an analogue-to-digital converter BS EN 12668-1:2010EN 12668-1:2010 (E) 5 3.7 dynamic range ratio of the amplitude of the largest signal to the smallest signal which an ultrasonic instrument can display 3.8 equivalent input noise measure of the electronic noise level observed on
28、 the ultrasonic instrument screen, and defined by the input signal level, measured at the receiver input terminals, that would give the same level on the screen if the amplifier itself were noiseless 3.9 external attenuator standard attenuator calibrated to a traceable source used to test the ultras
29、onic instrument 3.10 fall time of proportional output time it takes the proportional gate output to fall from 90 % to 10 % of its peak value 3.11 frequency response of proportional gate output measure of how the amplitude of the proportional gate output varies with input signal frequency 3.12 hold t
30、ime of switched outputs time for which the switched output from a monitor gate will remain above 50 % of its maximum output following a signal in the monitor gate which is above the threshold 3.13 hold time of proportional output time for which the proportional output is above 90 % of its peak outpu
31、t following a signal in the monitor gate 3.14 linearity of proportional output measure of how close the voltage output from the proportional gate is to being directly proportional to the input signal amplitude 3.15 linearity of time base measure of how close the horizontal graticule reading on the u
32、ltrasonic instrument screen is to being directly proportional to the time-of-flight of an echo 3.16 linearity of vertical display measure of how close the vertical graticule reading of a signal on the ultrasonic instrument screen is to being directly proportional to the input signal amplitude 3.17 m
33、id gain position ultrasonic instrument gain setting which is half way between the maximum and minimum gains, measured in decibels EXAMPLE For an ultrasonic instrument with a maximum gain of 100 dB and a minimum gain of 0 dB, the mid gain position would be 50 dB. 3.18 monitor gate section of the time
34、-base on the A-scan display in which the amplitude is compared to a threshold and/or converted to an analogue output BS EN 12668-1:2010EN 12668-1:2010 (E) 6 3.19 monitor threshold minimum signal amplitude that will operate the monitor gate output 3.20 noise of proportional output measure of the nois
35、e on the proportional output 3.21 proportional output output from the ultrasonic instrument which gives a d.c. voltage nominally proportional to the amplitude of the largest received signal within a monitor gate 3.22 pulse duration time interval during which the modulus of the amplitude of a pulse i
36、s 10 % or more of its peak amplitude 3.23 pulse repetition frequency frequency at which the transmission pulse is triggered 3.24 pulse rise time time taken for the amplitude of the leading edge of a pulse to rise from 10 % to 90 % of its peak value 3.25 pulse reverberation secondary maximum in the t
37、ransmitter pulse waveform after the intended output 3.26 receiver input impedance characterisation of the internal impedance of the receiver as a parallel resistance and capacitance 3.27 response time of digital ultrasonic instruments time over which a signal has to be detected by a digital ultrason
38、ic instrument before it is displayed at 90 % of its peak amplitude 3.28 rise time of proportional output time interval that it takes the proportional gate output to rise from 10 % to 90 % of its peak value 3.29 temporal resolution minimum time interval over which two pulses are resolved by a drop in
39、 amplitude of 6 dB 3.30 time-dependent gain TDG time-dependent or swept-gain function fitted to some ultrasonic instruments to correct for the distance-related reduction in reflected amplitude 3.31 short pulse unrectified pulse which has fewer than 1,5 cycles in the time interval over which the puls
40、e amplitude exceeds half its maximum peak amplitude BS EN 12668-1:2010EN 12668-1:2010 (E) 7 3.32 suppression preferential rejection of signals near the baseline of the screen, deliberately introduced to remove grass and noise or to steepen the trailing edges of larger echoes 3.33 switching hysteresi
41、s difference in amplitude between the signal which turns on and turns off a monitor gate 4 Symbols Table 1 Symbols Symbol Unit Meaning Ao, AndB Attenuator settings used during tests CmaxpF Parallel capacity of receiver at maximum gain CminpF Parallel capacity of receiver at minimum gain DSdB Cross-t
42、alk damping during transmission fgHz Frequency bandwidth measured at proportional gate output fgoHz Centre frequency measured at proportional gate output fguHz Upper frequency limit at - 3 dB, measured at proportional gate output fglHz Lower frequency limit at - 3 dB, measured at proportional gate o
43、utput fgmaxHz Frequency with the maximum amplitude in the frequency spectrum measured at proportional gate output foHz Centre frequency fuHz Upper frequency limit at - 3 dB flHz Lower frequency limit at - 3 dB fmaxHz Frequency with the maximum amplitude in the frequency spectrum f Hz Frequency bandw
44、idth ImaxA Amplitude of the maximum current that can be driven by the proportional gate output N Number of measurements taken ninHzV/ Noise per root bandwidth for receiver input Rl Termination resistor Rmax Input resistance of receiver at maximum gain Rmin Input resistance of receiver at minimum gai
45、n S dB Attenuator setting T s Time incrementBS EN 12668-1:2010EN 12668-1:2010 (E) 8 Table 1 (continued) Symbol Unit Meaning tds Pulse duration Tfinals Time to the end of distance amplitude curve Tos Time to the start of distance amplitude curve trs Transmitter pulse rise time from an amplitude of 10
46、 % to 90 % of peak amplitude tA1, tA2s Temporal resolution VEV Input voltage at the receiver VeinV Receiver input equivalent noise VinV Input voltage VlV Proportional gate output voltage with load resistor VmaxV Maximum input voltage of the receiver VminV Minimum input voltage of the receiver VoV Pr
47、oportional gate output voltage with no load resistor VrV Voltage amplitude of the ringing after the transmitter pulse V50V Voltage amplitude of the transmitter pulse with a 50 loading of the transmitter V75V Voltage amplitude of the transmitter pulse with a 75 loading of the transmitter Zo Output im
48、pedance of transmitter ZA Output impedance of proportional output 5 General requirements for compliance An ultrasonic instrument complies with this standard if it satisfies all of the following conditions: a) the ultrasonic instrument shall comply with Clause 7; b) either a declaration of conformity
49、, issued by a manufacturer operating a certified quality management system, or issued by an organization operating an accredited test laboratory shall be available; NOTE 1 It is recommended that the certification is carried out in accordance with EN ISO 9001, or that the accreditation is carried out in accordance with EN ISO/IEC 17025. c) the ultrasonic instrument shall be clearly marked to ident
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