SIST EN 12668-2:2011
(Main)Non-destructive testing - Characterization and verification of ultrasonic examination equipment - Part 2: Probes
Non-destructive testing - Characterization and verification of ultrasonic examination equipment - Part 2: Probes
This European Standard covers probes used for ultrasonic non-destructive examination in the following categories with centre frequencies in the range 0,5 MHz to 15 MHz, focusing and without focusing means: a) single or dual transducer contact probes generating compressional or shear waves; b) single transducer immersion probes. Where material-dependent ultrasonic values are specified in this document they are based on steels having a sound velocity of (5 920 ± 50) m/s for longitudinal waves, and (3 255 ± 30) m/s for transverse waves. Periodic tests for probes are not included in this document. Routine tests for the verification of probes using on-site methods are given in EN 12668-3. If parameters in addition to those specified in EN 12668-3 are to be verified during the probe's life time, as agreed upon by the contracting parties, the methods of verification for these additional parameters should be selected from those given in this document.
Zerstörungsfreie Prüfung - Charakterisierung und Verifizierung der Ultraschall-Prüfausrüstung - Teil 2: Prüfköpfe
Diese Europäische Norm gilt für Prüfköpfe für die zerstörungsfreie Prüfung mit Ultraschall mit Mittenfrequenzen von 0,5 MHz bis 15 MHz, fokussierend oder ohne fokussierende Vorrichtungen in den folgenden Kategorien:
a) Prüfköpfe für den direkten Kontakt mit einem oder zwei Schwingern, die Longitudinalwellen oder Transversalwellen erzeugen;
b) Tauchtechnik-Prüfköpfe.
Wenn materialabhängige Ultraschallwerte in dieser Norm angegeben werden, beruhen sie auf Stahl mit einer Schallgeschwindigkeit von (5 920 ± 50) m/s bei Longitudinalwellen und von (3 255 ± 30) m/s bei Transversalwellen.
Wiederkehrende Überprüfungen für Prüfköpfe sind nicht in diesem Teil der Norm enthalten. Routinemäßige Kontrollen zur Beurteilung von Prüfköpfen mit Methoden, die am Prüfort angewendet werden können, sind in EN 12668-3 aufgeführt.
Wenn mit Zustimmung der Vertragspartner außer den in EN 12668-3 aufgeführten Parametern auch noch zusätzliche Parameter während der Lebensdauer des Prüfkopfes gemessen werden müssen, so sollten die Verfahren zur Beurteilung für diese zusätzlichen Parameter aus den im vorliegenden Teil der Norm aufgeführten Verfahren ausgewählt werden.
Essais non destructifs - Caractérisation et vérification de l'appareillage de contrôle par ultrasons - Partie 2: Traducteurs
La présente Norme européenne concerne les traducteurs utilisés pour le contrôle non destructif par ultrasons des
catégories suivantes avec fréquences centrales dans la bande 0,5 - 15 MHz, avec et sans moyens de focalisation :
a) traducteurs contact, à transducteur simple ou à émetteur et récepteur séparés, générant des ondes de
compression ou de cisaillement ;
b) traducteurs à transducteur simple en immersion.
Lorsque des valeurs de mesures ultrasonores dépendant des matériaux sont spécifiées dans le présent document,
elles sont basées sur des aciers ayant une vitesse de propagation de l’onde ultrasonore de (5 920 ± 50) m/s pour
les ondes longitudinales et de (3 255 ± 30) m/s pour les ondes transversales.
Les essais périodiques des traducteurs ne sont pas inclus dans le présent document. Les essais systématiques de
vérification des traducteurs par application des méthodes sur site sont décrits dans l’EN 12668-3.
Si des paramètres, complémentaires à ceux spécifiés dans l’EN 12668-3, doivent être vérifiés au cours de la vie du
traducteur conformément à un accord conclu entre les parties contractantes, il convient de choisir les méthodes de
vérification correspondantes de ces paramètres complémentaires parmi celles données dans le présent document.
Neporušitveno preskušanje - Ugotavljanje značilnosti in overjanje naprav za ultrazvočno preskušanje - 2. del: Preskuševalne glave
Ta evropski standard zajema preskuševalne glave za ultrazvočno neporušitveno preskušanje v naslednjih kategorijah z osrednjimi frekvencami v razponu od 0,5 MHz do 15 MHz, z načini izostritve in brez njih: a) kontaktne sonde z enojnim ali dvojnim pretvornikom, ki proizvajajo kompresijske ali strižne valove; b) preskuševalne glave za enojni potopni pretvornik. Kjer so v tem dokumentu določene od materiala odvisne ultrazvočne vrednosti, temeljijo na jeklih, ki imajo hitrost zvoka (5 920 ± 50) m/s za longitudinalne valove in (3 255 ± 30) m/s za prečne valove. Periodični preskusi za preskuševalne glave niso vključeni v ta dokument. Rutinski preskusi za preverjanje preskuševalnih glav, ki uporabljajo metode na kraju samem, so podani v EN 12668-3. Če se med življenjsko dobo preskuševalne glave preverjajo parametri poleg tistih, določenih v EN 12668-3, kot je dogovorjeno med pogodbenimi strankami, se morajo metode preverjanja teh dodatnih parametrov izbrati med tistimi, ki so podane v tem dokumentu.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zerstörungsfreie Prüfung - Charakterisierung und Verifizierung der Ultraschall-Prüfausrüstung - Teil 2: PrüfköpfeEssais non destructifs - Caractérisation et vérification de l'appareillage de contrôle par ultrasons - Partie 2: TraducteursNon-destructive testing - Characterization and verification of ultrasonic examination equipment - Part 2: Probes19.100Neporušitveno preskušanjeNon-destructive testingICS:Ta slovenski standard je istoveten z:EN 12668-2:2010SIST EN 12668-2:2011en,fr,de01-februar-2011SIST EN 12668-2:2011SLOVENSKI
STANDARDSIST EN 12668-2:2002/A1:2004SIST EN 12668-2:20021DGRPHãþD
SIST EN 12668-2:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12668-2
February 2010 ICS 19.100 Supersedes EN 12668-2:2001English Version
Non-destructive testing - Characterization and verification of ultrasonic examination equipment - Part 2: Probes
Essais non destructifs - Caractérisation et vérification de l'appareillage de contrôle par ultrasons - Partie 2: Traducteurs
Zerstörungsfreie Prüfung - Charakterisierung und Verifizierung der Ultraschall-Prüfausrüstung - Teil 2: Prüfköpfe 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 European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references 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 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12668-2:2010: ESIST EN 12668-2:2011
EN 12668-2:2010 (E) 2 Contents Page Foreword .41 Scope .52 Normative references .53 Terms and definitions .54 General requirements for compliance .75 Technical specification for probes .76 Test equipment . 116.1 Electronic equipment . 116.2 Test blocks and other equipment . 117 Performance requirements for probes . 147.1 Physical aspects . 147.1.1 Method . 147.1.2 Acceptance criterion . 147.2 Radio frequency pulse shape . 147.2.1 Method . 147.2.2 Acceptance criterion . 147.3 Pulse spectrum and bandwidth . 147.3.1 Method . 147.3.2 Acceptance criteria . 157.4 Relative pulse-echo sensitivity . 157.4.1 Method . 157.4.2 Acceptance criterion . 157.5 Distance-amplitude curve . 157.5.1 Method . 157.5.2 Acceptance criterion . 167.6 Electrical impedance . 177.6.1 Method . 177.6.2 Acceptance criteria . 177.7 Beam parameters for immersion probes . 177.7.1 General . 177.7.2 Beam profile − measurements performed directly on the beam . 187.7.3 Beam profile − measurements made using an automated scanning system . 207.8 Beam parameters for contact, straight-beam, single transducer probes . 217.8.1 General . 217.8.2 Beam divergence and side lobes . 227.8.3 Squint angle and offset . 237.8.4 Focal distance (near field length) . 237.8.5 Focal width . 247.8.6 Focal length . 247.9 Beam parameters for contact angle-beam single transducer probes. 257.9.1 General . 257.9.2 Index point . 257.9.3 Beam angle and beam divergence . 257.9.4 Squint angle and offset . 267.9.5 Focal distance (near field length) . 277.9.6 Focal width . 287.9.7 Focal length . 287.10 Beam parameters for contact, straight beam, dual-element probes . 297.10.1 General . 297.10.2 Cross talk . 297.10.3 Distance to sensitivity maximum (focal distance) . 297.10.4 Axial sensitivity range (focal length) . 29SIST EN 12668-2:2011
EN 12668-2:2010 (E) 3 7.10.5 Lateral sensitivity range (focal width) . 307.11 Beam parameters for contact angle beam, dual-element probes . 307.11.1 General. 307.11.2 Cross talk . 317.11.3 Index point . 317.11.4 Beam angle and profiles . 317.11.5 Distance to sensitivity maximum (focal distance) . 327.11.6 Axial sensitivity range (focal length) . 327.11.7 Lateral sensitivity range (focal width) . 32Annex A (normative)
Calculation of near field length of non-focusing probes . 45A.1 General. 45A.2 Straight beam probes . 45A.3 Angle beam probes . 46Annex B (informative)
Calibration block for angle-beam probes . 48Bibliography . 52 SIST EN 12668-2:2011
EN 12668-2:2010 (E) 4 Foreword This document (EN 12668-2:2010) 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 EN 12668-2:2001. EN 12668, Non-destructive testing — Characterization and verification of ultrasonic examination equipment, consists of the following parts: Part 1: Instruments Part 2: Probes Part 3: Combined equipment Annex A is normative. Annex B is informative.
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, 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.
SIST EN 12668-2:2011
EN 12668-2:2010 (E) 5 1 Scope This European Standard covers probes used for ultrasonic non-destructive examination in the following categories with centre frequencies in the range 0,5 MHz to 15 MHz, focusing and without focusing means: a) single or dual transducer contact probes generating compressional or shear waves; b) single transducer immersion probes. Where material-dependent ultrasonic values are specified in this document they are based on steels having a sound velocity of (5 920 ± 50) m/s for longitudinal waves, and (3 255 ± 30) m/s for transverse waves. Periodic tests for probes are not included in this document. Routine tests for the verification of probes using on-site methods are given in EN 12668-3. If parameters in addition to those specified in EN 12668-3 are to be verified during the probe's life time, as agreed upon by the contracting parties, the methods of verification for these additional parameters should be selected from those given in this document. 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 document (including any amendments) applies. EN 1330-4:2010, Non-destructive testing — Terminology — Part 4: Terms used in ultrasonic testing EN 12668-1, Non-destructive testing — Characterization and verification of ultrasonic examination equipment — Part 1: Instruments EN ISO 79631), Non-destructive testing — Ultrasonic testing Specification for calibration block n° 2 (ISO 7963:1985) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1330-4:2010 and the following apply. 3.1 dead zone depth of the zone immediately beneath the coupling surface of the work piece, in which it is not possible to detect a given reflector 3.2 focal distance
near field length point on the acoustical axis where the acoustic pressure is at its maximum 3.3 horizontal plane of a sound beam plane perpendicular to the vertical plane of the sound beam including the acoustical axis in the material
1) Under preparation. SIST EN 12668-2:2011
EN 12668-2:2010 (E) 6 3.4 operating frequency
fo
centre frequency arithmetic mean of upper and lower cut-off frequency 2olufff+= (1) NOTE In the frequency spectrum of an echo the upper and lower cut-off-frequencies are determined at -6 dB compared to the maximum amplitude.
3.5 peak-to-peak amplitude
h maximum deviation between the largest positive and the largest negative cycles of the pulse
NOTE See Figure 1. 3.6 probe data sheet sheet containing the information required by this standard NOTE The data sheet need not necessarily be a test certificate of performance. 3.7 pulse duration time interval over which the modulus of the unrectified pulse amplitude exceeds 10 % of its maximum amplitude, as shown in Figure 1 3.8 reference side reference side is the right side of an angle beam probe looking in the direction of the beam, unless otherwise specified by the manufacturer 3.9 relative bandwidth
∆∆∆∆frel ratio of the difference between the upper and lower cut-off frequencies fu and fl and the centre frequency fo
∆frel = [(fu - fl)/fo] × 100 % NOTE The relative bandwidth is expressed in percent (%). 3.10 squint angle for straight-beam probes
δδδδ deviation between the axis of the beam and a perpendicular to the coupling surface at the emission point
NOTE 1 See Figure 2. angle between the sides of the probe housing and the measured beam axis, projected onto the plane of the probe face
NOTE 2 See Figure 3. 3.11 vertical plane of a sound beam plane in which the sound beam axis in the probe wedge and the sound beam axis in the inspected component both lie SIST EN 12668-2:2011
EN 12668-2:2010 (E) 7 4 General requirements for compliance An ultrasonic probe complies with this standard if it satisfies the following conditions: a) the probe shall comply with Clause 7; b) either a declaration of conformity, issued by a manufacturer operating a certified quality management system, or issued by an organization operating an accredited test laboratory shall be available; NOTE 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 probe shall be clearly marked to identify the manufacturer, and carry a unique serial number, showing operating frequency, transducer size, angle, or a permanent reference number from which this information can be traced; d) a technical specification (data sheet) for the appropriate type and series of probe which defines the performance criteria in accordance with Clause 5 shall be available. The quality of probes will be assured in one of the following ways: e) by issuing a declaration of conformity based on statistical analysis where a number of identical probes are manufactured under a quality management system. The manufacturer shall supply a data sheet which includes the values of the specified parameters with tolerances; f) by issuing a declaration of conformity quoting the results of measurements made on each probe. 5 Technical specification for probes Table 1 gives the list of information to be reported in a data sheet for all probes within the scope of this standard (I = Information, M = Measurement, C = Calculation). The data sheet shall also contain information concerning the ultrasonic instrument used for the test, its settings and coupling conditions, etc. The operating temperature range of the probe, and any special conditions for storage or protection during transport shall also be stated in the data sheet. For probes intended for use at elevated temperatures, the manufacturer shall provide information on the maximum operating temperature in relation to the time of use, and the effect of temperature on the sensitivity and on the beam angle. SIST EN 12668-2:2011
EN 12668-2:2010 (E)
8 Table 1 — List of information to be given in a data sheet
Category of probe
Contact Immersion
Straight beam Angle beam Straight Information Compressional Shear Compressional Shear Compressional to be given Single Double Single Single Double Single Double Single
non-f. focus. non-f. focus. non-f. non-f. focus. non-f. focus. non-f. focus. non-f. focus. non-f. focus. Manufacturer's name I I I I I I I I I I I I I I I Type of probe I I I I I I I I I I I I I I I Weight and size of probe I I I I I I I I I I I I I I I Type of connectors I I I I I I I I I I I I I I I TR connectors interchangeable?
I I
I I
I I
Material of transducers I I I I I I I I I I I I I I I Shape and size of transducers I I I I I I I I I I I I I I I Material of wedge, delay I I I I
I I I I I I I I
Material of wear plate I
Wear allowance I I I I
I I I I I I I I
I = Information; M = Measurement; C = Calculation. continued SIST EN 12668-2:2011
EN 12668-2:2010 (E) 9 Table 1 (continued)
Category of probe
Contact Immersion
Straight beam Angle beam Straight Parameters to be Compressional Shear Compressional Shear Compressional measured or calculated Single Double Single Single Double Single Double Single
non-f. focus. non-f. focus. non-f. non-f. focus. non-f. focus. non-f. focus. non-f. focus. non-f. focus. Cross talk damping
M M
M M
M M
Pulse shape (time and frequency) M M M M M M M M M M M M M M M Centre frequency, band width M M M M M M M M M M M M M M M Pulse-echo sensitivity M M M M M M M M M M M M M M M Distance-amplitude curve M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C Impedance, static capacitance M M M M M M M M M M M M M M M I = Information; M = Measurement; C = Calculation; M,C = Measurement or calculation. continued SIST EN 12668-2:2011
EN 12668-2:2010 (E)
10 Table 1 (end)
Category of probe
Contact Immersion
Straight beam Angle beam Straight Parameters to be Compressional Shear Compressional Shear Compressional measured or calculated Single Double Single Single Double Single Double Single
non-f. focus. non-f. focus. non-f. non-f. focus. non-f. focus. non-f. focus. non-f. focus. non-f. focus. Probe index
M M M M M M M M
Beam angle
M M M M M M M M
Angles of divergence M
M M
M
M
Beam axis offset M M M M M M M M M M M M M
Squint angle M M M M M M M M M M M M M
Focal distance, near field M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C M,C Focal width M M M M M M M M M M M M M M M Focal length M M M M M M M M M M M M M M M Physical aspects M M M M M M M M M M M M M M M I = Information; M = Measurement; C = Calculation; M,C = Measurement or calculation; Non-f. = Non-focusing. SIST EN 12668-2:2011
EN 12668-2:2010 (E) 11 6 Test equipment 6.1 Electronic equipment The ultrasonic instrument (or laboratory pulser/receiver) used for the tests specified in Clause 7 shall be of the type designated on the probe data sheet, and shall comply with EN 12268-1 as applicable. Where more than one type of ultrasonic instrument is designated the tests shall be repeated with each of the additional designated types. Testing shall be carried out with the probe cables and electrical matching devices specified on the probe data sheet for use with the particular type of ultrasonic instrument. NOTE Probe leads more than about 2 m long could have significant effect on probe performance. In addition to the ultrasonic instrument or laboratory pulser/receiver the items of equipment essential to assess probes in accordance with this standard are as follows: a) an oscilloscope with a minimum bandwith of 100 MHz; b) a frequency spectrum analyser with a minimum bandwith of 100 MHz, or an oscilloscope/digitiser or computer capable of performing Discrete Fourier Transforms (DFT); c) an impedance analyser. The following additional equipment is optional: d) For contact probes only: 1) an electromagnetic-acoustic probe (EMA) and receiver; 2) a plotter to plot directivity diagrams; e) For immersion probes only: 1) hydrophone receiver with an active diameter less than two times the central ultrasonic wavelength of the probe under test but not less than 0,5 mm. The bandwidth of the amplifier should be higher than the bandwidth of the probe under test. 6.2 Test blocks and other equipment The following test blocks shall be used to carry out the specified range of tests, for contact probes only: a) semi-cylinders with different radii (R) in the range from 12 mm to 200 mm. Steps of 2R are recommended. Steel quality is as defined in EN ISO 7963. The thickness of each block shall be equal to or larger than its radius, up to a maximum thickness of 100 mm; b) steel blocks with parallel faces and side-drilled holes of 3 mm diameter as shown in Figure 4. The dimensions of the blocks shall meet the following requirements: 1) length, l, height, h, and width, w, shall be such that the sides of the blocks shall not interfere with the ultrasonic beam; 2) depths of the holes, d1, d2, etc., shall be such that at least three holes shall fall outside the near field; 3) the distance between the holes, s, shall be such that the amplitude profile across the holes shows an amplitude drop of at least 26 dB between two adjacent holes; 4) steel quality is as defined in EN ISO 7963. SIST EN 12668-2:2011
EN 12668-2:2010 (E)
12 c) steel blocks with inclined faces with a notch as shown in Figure 5, and steel blocks with hemispherical holes as in Figure 6. Steel quality is as defined in EN ISO 7963. These blocks are used to measure the beam divergence in the vertical and horizontal plane respectively; d) an alternative steel block to measure index point, beam angle and beam divergence for angle beam probes is given in Annex B; e) ruler; f) feeler gauges starting at 0,05 mm. NOTE Not all blocks are required if only special kinds of probes are to be checked, e.g. blocks to measure the index point and beam angle are not necessary if only straight-beam probes have to be measured. For testing immersion probes the following reflectors and additional equipment shall be used: g) a steel ball or semi-spherical ended rod with smooth reflective surface. For each frequency range the diameter of ball or rod to be used is given in Table 2. Table 2 — Steel ball (rod) diameters for different frequencies Probe centre frequency MHz Diameter d of ball or rod mm 3 < f ≤ 15 d ≤ 3 0,5 ≤ f ≤3 3 < d ≤ 5 h) a large plane and flat reflector target. The target's lateral size shall be at least ten times wider than the diameter of the beam of the probe under test at the end of focal zone, as defined in 7.7.2.2. Thickness is at least five times the wavelength of the probe under test, calculated using the velocity of ultrasound in the material of the target. i) immersion tank equipped with a manual or automatic scanning bridge with five free axes: three linear axes X, Y, Z; two angular axes Θ and Ψ; j) automatic recording means: If the amplitudes of ultrasonic signals are recorded automatically, then it is the responsibility of the manufacturer to ensure that the system has sufficient accuracy. In particular, consideration shall be given to the effects of the system bandwidth, spatial resolution, data processing and data storage on the accuracy of the results. Typical set-ups to measure the sound beam of immersion probes are shown in Figures 15, 16 and 17. The scanning mechanism used with the immersion tank should be able to maintain alignment between the target and the probe in the X and Y directions, i.e. within ± 0,1 mm for 100 mm distance in the Z direction. The temperature of the water in the immersion tank shall be maintained at (20 ± 2) °C during the beam characterization of immersion transducers described in 7.7. Care shall be taken about the influence of sound attenuation in water, which, at high frequencies, causes a downshift of the echo frequency when using broadband probes. Table 3 shows the relation between frequency downshift and water path. SIST EN 12668-2:2011
EN 12668-2:2010 (E) 13 Table 3 — Frequency downshift in percent of centre frequency fo depending on total water path length, for relative bandwidths (b.w.) 50 % and 100 % fo b.w. Total water path
mm MHz % 10 20 30 40 50 60 70 80 90 100 150 200 250 300 350 400 5 50 0 0 0 0 0 0 1 1 1 1 1 2 2 2 3 3
100 0 1 1 1 2 2 2 3 3 3 5 6 7 9 10 11 10 50 0 1 1 1 2 2 2 3 3 3 5 6 7 9 10 11
100 1 3 4 5 6 7 8 9 10 11 16 21 24 28 31 34 15 50 1 1 2 3 4 4 5 6 6 7 10 13 15 18 20 23
100 3 6 8 10 13 15 17 19 21 23 30 37 42 47 50 54 20 50 1 3 4 5 6 7 8 9 10 11 16 21 24 28 31 34
100 5 10 13 17 21 24 27 29 32 34 44 51 56 61 64 67 25 50 2 4 6 7 9 11 12 14 15 17 23 29 34 38 41 45
100 7 14 20 24 29 33 36 39 42 45 55 62 67 70 74 76 30 50 3 6 8 10 13 15 17 19 21 23 30 37 42 47 50 54
100 10 19 26 32 37 41 45 48 51 54 64 70 74 78 80 82 SIST EN 12668-2:2011
EN 12668-2:2010 (E) 14 7 Performance requirements for probes 7.1 Physical aspects 7.1.1 Method Visually inspect the outside of the probe for correct identification and assembly and for physical damage which can influence its current or future reliability. In particular, for contact probes measure the flatness of the contact surface of the probe using a ruler and feeler gauges. 7.1.2 Acceptance criterion For flat faced probes, over the whole probe face the gap shall not be larger than 0,05 mm. 7.2 Radio frequency pulse shape 7.2.1 Method The amplitude and pulse duration of the echo is determined with a measurement set-up as in Figure 7 (contact probe) or Figure 17 (immersion): a) for contact probes with a single transducer the echo out of a semi-cylinder is used whose radius is larger than 1,5 times of the near field length of the probe or within the focal range of focused probes; b) for dual-element probes a semi-cylinder is used whose radius is nearest to the focal point of the probe; c) for immersion probes a large flat reflector is used at the focal distance for focused probes or at more than one nearfield length for flat transd
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