BS EN 12668-1:2010
BRITISHSTANDARD
Non-destructive testing - Characterization and verification of ultrasonic examination equipment
Part 1: Instruments
ICS 19.100
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Not for Resale BSEN12668-1:2010
National foreword
This British Standard is the UK implementation of EN 12668-1:2010. It supersedes BS EN 12668-1:2000 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEE/46, Non-destructive testing. 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 confer immunity from legalobligations.
This British Standard was published under the authority of the Standards Policy and Strategy
Amendments/corrigendaissuedsincepublication
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Committee on 28 February 2010 BSI 2010
ISBN 978 0 580 58073 4
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EN 12668-1
EUROPEANSTANDARD NORMEEUROPEENNE EUROPAISCHE NORM
February 2010
ICS 19.100
Supersedes EN 12668-1:2000
English Version
Non-destructive testing-Characterization and verificationof
ultrasonic examination equipment-Part 1:Instruments
Zerstorungsfreie Prufung - Charakterisierung und Verifizierung der Ultraschall-Prufausrustung - Teil 1:
Essais non destructifs - Caracterisation et verification de
'appareillage de controle par ultrasons - Partie 1 :
Appareils
Prufgerate
This 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 Europe an Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning s uch 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 tra nslation under the responsibility of a CEN member 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, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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@2010CEN All rights of exploitation in any form and by any means reserved
Ref. No. EN 12668-1:2010: E
worldwide for CEN national Members.
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Contents
Page
Foreword. 1
.3 .4
Scope Normativereferences.. Terms and definitions Symbols.. General requirements for compliance.. Manufacturer's technical specificationforultrasonic instruments.
2 3 4 5 6 6.1 General............ 6.2 General attributes ... 6.3 Display 6.4 Transmitter 6.5 Receiverandattenuator 6.6 Monitor output. 6.7 Additional information. 7
4
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.8
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*9 .9 10 ..10 11 11
Performance requirements for ultrasonic instruments.. Group 1 tests..
11 13
8 8.1 Equipmentrequiredforgroup1tests.. 8.2 Stability against temperature .... 8.3 Stability against voltage variation... 8.4 Transmitterpulseparameters.. 8.5 Receiver... 8.6 Monitorgate 8.7 Monitorgates withproportionaloutput.. 8.8 Digital ultrasonic instruments......... 9
...13 14 16 16 ..18
21 22 ....26
Group2tests..
27 .. 27 28 .28 ....29 ...30 .. 32
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9.1 Equipment required forgroup2tests 9.2 Physical state and external aspects.. 9.3 Stability......... 9.4 Transmitterpulseparameters 9.5 Receiver.. 9.6 Linearity of time-base.... Annex A (normative)Special conditions for ultrasonic instrumentswith logarithmic amplifiers .44 A.1 Introduction...
..44 ..44 .. 44 44 44 .45
A.2 Basic requirements. A.2.1 Measuring accuracy A.2.2 Vertical display"linearity A.3 Tests.. Bibliography..
dards Institution
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Not for Resale BSEN12668-1:2010 EN12668-1:2010 (E)
Foreword This document (EN 12668-1:2010) has been prepared by Technical Committee CEN/TC 138 Non-destructive 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 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 EN12668-1:2000 EN12668,Non-destructivetesting-Characterization and verification of ultrasonic examination equipment, consists of the following parts:
Part 1: Instruments Part 2:Probes Part3:Combinedequipment
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According to the CEN/CENELEC Internal Regulations,the national standards organizations of the following countries areboundto implementthis 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,Switzerland and the United Kingdom.
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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 ultrasonic non-destructive examination with single or dual-element probes operating within the centre frequency range O,5 MHz to 15 MHz. Ultrasonic instruments for continuous waves are not included in this standard.Thisstandardmaypartlybe applicableto ultrasonic instrumentsin automatedsystemsbutthen othertestscanbeneededtoensuresatistactoryperftormance
2 Normativereferences 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 document (including any amendments) applies. EN1330-4:2010,Non-destructive testing—Terminology—Part 4:Termsused in ultrasonic testing EN12668-3,Non-destructivetesting— Characterization and verification of ultrasonic examination equipment—Part3:Combinedequipment
3Terms and definitions For the purposes of this document, the terms and definitions given in EN 1330-4:2010 and the following apply 3.1 amplifierfrequencyresponse 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 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 the 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 deadtimeaftertransmitterpulse time interval following the start 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 measurements taken by an analogue-to-digital converter
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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 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 ultrasonic 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 frequencyresponseofproportional gateoutput measure of how the amplitude of the proportional gate output varies with input signal frequency 3.12 hold time 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 9o % of its peak output following a signal in the monitor gate 3.14 linearityof 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 ultrasonic 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 mid gain position ultrasonic instrument gain setting which is half way between the maximum and minimum gains, measured in decibels
For an ultrasonic instrument with a maximum gain of 100 dB and a minimum gain of o dB, the mid gain
EXAMPLE position would be 50 dB. 3.18 monitorgate section of the time-base on the A-scan display in which the amplitude is compared to a threshold and/or converted to an analogue output
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3.19 monitor threshold minimum signal amplitude that will operate the monitor gate output 3.20 noise ofproportional output measure of the noise 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 is 10 % or more of its peak amplitude 3.23 pulse repetitionfrequency 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 transmitter pulse waveform after the intended output 3.26 receiverinput impedance characterisation of the internal impedance of the receiver as a parallel resistance and capacitance 3.27 responsetimeof digital ultrasonic instruments time over which a signal has to be detected by a digital ultrasonic instrument before it is displayed at 90 % of itspeakamplitude 3.28 risetimeofproportionaloutput time interval that it takes the proportional gate output to rise from 1o % to 90 % of its peak value 3.29 temporal resolution minimum time interval over which two pulses are resolved by a drop in 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 reductionin reflected amplitude 3.31 shortpulse unrectified pulse which has fewer than 1,5 cycles in the time interval over which the pulse amplitude exceeds halfitsmaximumpeakamplitude
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