{"id":5000,"date":"2026-09-07T14:36:40","date_gmt":"2026-09-07T14:36:40","guid":{"rendered":"https:\/\/ultrasuonindt.it\/ndt-technologies-and-standards\/flaw-detection\/a-scan-display\/"},"modified":"2026-09-13T15:55:52","modified_gmt":"2026-09-13T15:55:52","slug":"a-scan-display","status":"publish","type":"page","link":"https:\/\/ultrasuonindt.it\/en\/ndt-technologies-and-standards\/flaw-detection\/a-scan-display\/","title":{"rendered":"A-Scan display"},"content":{"rendered":"\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:36%\">\n<figure class=\"wp-block-image size-large has-custom-border\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"387\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-display_con_immagine_rappresentazione_modo_funzionamento_flaw-web-387x387-1.webp?resize=387%2C387&#038;ssl=1\" alt=\"Representation of the A-Scan waveform on the instrument display\" class=\"wp-image-964\" style=\"border-color:#000000;border-width:1px;border-radius:15px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-display_con_immagine_rappresentazione_modo_funzionamento_flaw-web-387x387-1.webp?w=387&amp;ssl=1 387w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-display_con_immagine_rappresentazione_modo_funzionamento_flaw-web-387x387-1.webp?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-display_con_immagine_rappresentazione_modo_funzionamento_flaw-web-387x387-1.webp?resize=150%2C150&amp;ssl=1 150w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:4%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<div class=\"wp-block-group has-background is-layout-flow wp-block-group-is-layout-flow\" style=\"border-top-right-radius:6px;border-bottom-right-radius:6px;border-left-color:#225f78;border-left-width:6px;background-color:#ebf1f4;padding-top:24px;padding-right:28px;padding-bottom:24px;padding-left:28px\">\n<p class=\"has-text-color wp-block-paragraph\" style=\"color:#225f78;font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.408), 18px);font-style:italic;font-weight:400;line-height:1.6\">Without A-Scan the instrument gives a number and nothing more. With A-Scan it shows where that number comes from, and it becomes possible to distinguish a valid reading from one that merely seems so. <\/p>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\" style=\"list-style:none;padding-left:0px;line-height:1.6\">\n<li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> Representation of signal amplitude over time<\/li>\n\n\n\n<li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> Distinction between back-wall echo, flaw echo and noise<\/li>\n\n\n\n<li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> Validation of the measurement on difficult materials<\/li>\n\n\n\n<li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> Storage of the waveform for later review<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n<p class=\"wp-block-paragraph\">The A-Scan is the graph of the signal received by the transducer: on the horizontal axis time, which corresponds to depth in the material, on the vertical axis signal amplitude. Every reflecting surface produces a peak, and the position of the peak tells how far away what generated it lies. <\/p>\n\n<p class=\"wp-block-paragraph\">In a thickness measurement on sound material the trace is readable: the initial pulse, then the back-wall echo, possibly the subsequent echoes. On an attenuating material or a corroded wall the picture changes: the back-wall echo drops, intermediate peaks appear, noise rises. That is where the figure alone on the display becomes insufficient.  <\/p>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-4066 popmake-739\" style=\"border-width:1px;min-height:250px;aspect-ratio:unset;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"250\" class=\"wp-block-cover__image-background wp-image-727 size-full\" alt=\"\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1200%2C250&#038;ssl=1\" data-object-fit=\"cover\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=300%2C63&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1024%2C213&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=768%2C160&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-30 has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-15701bb7 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color is-style-default has-luminous-vivid-amber-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.374), 35px);\"><strong>Need help choosing the right product?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button popmake-4066 popmake-739\"><a class=\"wp-block-button__link has-ti-accent-color has-cyan-bluish-gray-background-color has-text-color has-background has-link-color wp-element-button\">Contact us<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">In flaw detection the A-Scan is not an aid but the working tool: the operator assesses the amplitude and position of the peaks, compares them with a reference curve and decides. Without the waveform there is nothing to assess. <\/p>\n\n<h2 class=\"wp-block-heading\">What can be read on the trace<\/h2>\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Element<\/th><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">What it indicates<\/th><\/tr><\/thead><tbody><tr><td>Peak position<\/td><td>The depth at which the reflecting surface lies<\/td><\/tr><tr><td>Peak amplitude<\/td><td>How much energy has been sent back<\/td><\/tr><tr><td>Back-wall echo<\/td><td>The opposite surface of the part<\/td><\/tr><tr><td>Intermediate peaks<\/td><td>Possible internal discontinuities, to be assessed<\/td><\/tr><tr><td>High background noise<\/td><td>Attenuating material or insufficient coupling<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">Peak detection modes<\/h2>\n\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:36%\">\n<figure class=\"wp-block-image size-large has-custom-border\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"1200\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=1200%2C1200&#038;ssl=1\" alt=\"Dakota FX70 flaw detector with A-Scan display\" class=\"wp-image-1034\" style=\"border-color:#000000;border-width:1px;border-radius:15px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=768%2C768&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:4%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<p class=\"wp-block-paragraph\">On Dakota NDT flaw detectors of the FX family the manufacturer&#8217;s documentation indicates three echo detection criteria: Z-Cross, Flank and Peak. They are different ways of establishing which point of the waveform is taken as the reference for the measurement. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The same instruments have a PRF adjustable from 8 Hz to 2 kHz and a 60 Hz screen refresh: a trace that updates quickly keeps the signal readable even while the probe moves over the part.<\/p>\n<\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\">Instruments with A-Scan<\/h2>\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Instrument<\/th><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Display type<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/flaw-detectors\/dakota-fx70-dl-portable-ultrasonic-flaw-detector\/\">Dakota FX70-DL<\/a><\/td><td>Portable A-Scan and B-Scan for field inspections<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/flaw-detectors\/dakota-fx81-dl-benchtop-flaw-detector\/\">Dakota FX81-DL<\/a><\/td><td>Benchtop version with large display<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/thickness-gauges\/dakota-cmx10-dl-top-of-the-range-corrosion-gauge\/\">Dakota CMX10-DL<\/a><\/td><td>Colour A-Scan on the flagship thickness gauge<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/thickness-gauges\/dakota-mx2-dl-a-scan-b-scan-corrosion-gauge\/\">Dakota MX2-DL<\/a><\/td><td>A-Scan with waveform storage<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1757290001\"><strong class=\"schema-faq-question\">Is the A-Scan needed to measure thickness?<\/strong><p class=\"schema-faq-answer\">It is not indispensable on sound materials and regular surfaces. It becomes decisive on attenuating materials, on corroded walls and whenever one needs to understand why a reading is unstable. <\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-1757290002\"><strong class=\"schema-faq-question\">What do the two axes represent?<\/strong><p class=\"schema-faq-answer\">The horizontal axis represents time, which corresponds to depth in the material; the vertical axis represents the amplitude of the received signal.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-1757290003\"><strong class=\"schema-faq-question\">Can the waveform be saved?<\/strong><p class=\"schema-faq-answer\">Yes, on models that provide waveform storage: the trace is saved together with the reading and remains available to review a doubtful measurement later.<\/p><\/div><\/div>\n\n<p class=\"wp-block-paragraph\">Back to <a href=\"https:\/\/ultrasuonindt.it\/en\/ndt-technologies-and-standards\/flaw-detection\/\">Flaw detection<\/a> or write to us from the <a href=\"https:\/\/ultrasuonindt.it\/en\/contact\/\">Contacts<\/a> page.<\/p>\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h5 class=\"wp-block-heading\">Further information and contacts <\/h5>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\"><a href=\"http:\/\/www.roder.it\">Systems division and sensor integration partner : www.roder.it<\/a><br\/><a href=\"https:\/\/ultrasuonindt.it\/chi-siamo\/\">More information about RODER SRL : about us<\/a><br\/>Contact for general information : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><br\/>Contact for information about these products : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\"><br\/>The information contained on this web page is provided for information purposes only. Although it has been compiled with the utmost care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.    <\/p>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">Some images on this website have been intentionally generated using Artificial Intelligence (AI). This is because, for many applications and projects, it is not possible to disclose photographs of the installation or of the actual system due to confidentiality agreements, confidentiality clauses and non-disclosure agreements (NDAs). <\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Without A-Scan the instrument gives a number and nothing more. With A-Scan it shows where that number comes from, and it becomes possible to distinguish a valid reading from one that merely seems so. The A-Scan is the graph of the signal received by the transducer: on the horizontal axis time, which corresponds to depth [&hellip;]<\/p>\n","protected":false},"author":157040980,"featured_media":5001,"parent":4485,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"A-Scan display ultrasound","_yoast_wpseo_title":"A-Scan display | Dakota NDT","_yoast_wpseo_metadesc":"The A-Scan shows the waveform of the ultrasonic signal: how to read it, why it validates a reading and which Dakota instruments display it.","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-5000","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - 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