{"id":100296,"date":"2026-02-15T20:32:25","date_gmt":"2026-02-15T20:32:25","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100296"},"modified":"2026-07-17T12:23:21","modified_gmt":"2026-07-17T12:23:21","slug":"vibration-severity-chart","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/az\/calculators\/vibration-severity-chart\/","title":{"rendered":"Controlled Vibration Boundary Comparison Worksheet"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Controlled Vibration Boundary Comparison Worksheet\",\"description\":\"Compare one documented vibration value with three user-entered, source-controlled boundaries. No ISO limits are embedded and no condition, maintenance or shutdown decision is generated.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/vibration-severity-chart\/\",\"applicationCategory\":\"EngineeringApplication\",\"operatingSystem\":\"Any\",\"isAccessibleForFree\":true,\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"dateModified\":\"2026-07-17\",\"inLanguage\":\"en\"}<\/script>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Controlled Vibration Boundary Comparison\",\"item\":\"https:\/\/vibromera.eu\/calculators\/vibration-severity-chart\/\"}]}<\/script>\n<style>\n#vbm-zb{--zb-ink:#182f39;--zb-muted:#52656c;--zb-blue:#125c73;--zb-blue2:#0a4557;--zb-line:#b9cbd0;--zb-bg:#f5f8f8;--zb-white:#fff;--zb-warn:#87500d;--zb-warnbg:#fff4d8;--zb-bad:#962e2e;--zb-badbg:#fff0ef;--zb-good:#17663d;--zb-goodbg:#e8f7ee;max-width:1160px;margin:24px auto;font:16px\/1.55 Arial,sans-serif;color:var(--zb-ink);background:var(--zb-white);border:1px solid var(--zb-line);border-radius:18px;overflow:hidden;box-shadow:0 12px 34px rgba(24,47,57,.12)}\n#vbm-zb *{box-sizing:border-box}#vbm-zb h1,#vbm-zb h2,#vbm-zb h3{line-height:1.2;margin:0 0 12px}#vbm-zb p{margin:0 0 12px}#vbm-zb a{color:#075f75;text-decoration:underline;text-underline-offset:2px}#vbm-zb .zb-hero{padding:40px;background:linear-gradient(135deg,#0a3948,#12657b);color:#fff}#vbm-zb 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14px;background:#fff;margin:9px 0}#vbm-zb summary{font-weight:700;cursor:pointer}#vbm-zb .zb-footer{margin-top:24px;padding:17px;background:#edf3f4;border-radius:10px;color:var(--zb-muted);font-size:14px}\n@media(max-width:760px){#vbm-zb{width:100%;max-width:100%;margin:12px 0;border-radius:12px}#vbm-zb .zb-hero,#vbm-zb .zb-body{padding:22px 16px}#vbm-zb .zb-grid{grid-template-columns:minmax(0,1fr)}#vbm-zb .zb-wide{grid-column:auto}}@media(max-width:430px){#vbm-zb .zb-values{grid-template-columns:1fr}#vbm-zb button{width:100%}}\n<\/style>\n<main id=\"vbm-zb\">\n  <header class=\"zb-hero\"><div class=\"zb-kicker\">Source-controlled comparison, not an embedded ISO chart<\/div><h1>Controlled Vibration Boundary Comparison Worksheet<\/h1><p>Compare one documented vibration value with three boundaries transcribed from your applicable licensed or approved source. No ISO limits are built in, no machine class is inferred and no alarm, maintenance or shutdown action is generated.<\/p><div class=\"zb-tags\"><span class=\"zb-tag\">No hard-coded ISO thresholds<\/span><span class=\"zb-tag\">Exact source record required<\/span><span class=\"zb-tag\">Equality rule declared<\/span><span class=\"zb-tag\">No operating decision<\/span><\/div><\/header>\n  <div class=\"zb-body\">\n    <div class=\"zb-alert\"><strong>The former chart was not a valid ISO 10816-3 \/ 20816 implementation<\/strong>Its Class I included machines at or below 15 kW even though the official ISO 10816-3 scope begins above 15 kW. ISO 10816-3:2009 is withdrawn, and the public ISO 20816-3:2022 record does not validate the old class mapping or its twelve embedded boundaries.<\/div>\n    <div class=\"zb-boundary\"><strong>Current lifecycle at this review<\/strong>ISO 20816-1:2016 and ISO 20816-3:2022 remain the current published Parts 1 and 3, both at stage 90.92. Edition 2 FDIS replacements are under development at stage 50.00 and are not current published requirements. Recheck after publication.<\/div>\n    <form id=\"zb-form\" novalidate>\n      <section class=\"zb-card\"><h2>Machine and measurement identity<\/h2><p>These fields prevent a detached scalar from being treated as an overall machine decision.<\/p><div class=\"zb-grid\">\n        <div class=\"zb-field\"><label for=\"zb-case\">Case \/ report ID<\/label><input id=\"zb-case\" type=\"text\" maxlength=\"120\" required><\/div>\n        <div class=\"zb-field\"><label for=\"zb-asset\">Asset \/ machine ID<\/label><input id=\"zb-asset\" type=\"text\" maxlength=\"160\" required><\/div>\n        <div class=\"zb-field zb-wide\"><label for=\"zb-machine\">Machine set, coupling, bearings, support and relevant configuration<\/label><textarea id=\"zb-machine\" maxlength=\"1200\" required><\/textarea><\/div>\n        <div class=\"zb-field\"><label for=\"zb-rating\">Rated power and relevant rating basis<\/label><input id=\"zb-rating\" type=\"text\" maxlength=\"120\" required placeholder=\"Record value and unit; no class is inferred\"><\/div>\n        <div class=\"zb-field\"><label for=\"zb-speed\">Operating speed \/ range<\/label><input id=\"zb-speed\" type=\"text\" maxlength=\"120\" required placeholder=\"Record value and unit\"><\/div>\n        <div class=\"zb-field zb-wide\"><label for=\"zb-condition\">Operating state, load, process and baseline\/change context<\/label><textarea id=\"zb-condition\" maxlength=\"1200\" required><\/textarea><\/div>\n        <div class=\"zb-field\"><label for=\"zb-location\">Measurement part, location and direction<\/label><input id=\"zb-location\" type=\"text\" maxlength=\"220\" required><\/div>\n        <div class=\"zb-field\"><label for=\"zb-quantity\">Quantity, unit and amplitude convention<\/label><input id=\"zb-quantity\" type=\"text\" maxlength=\"180\" required placeholder=\"e.g. velocity, mm\/s RMS\"><\/div>\n        <div class=\"zb-field\"><label for=\"zb-band\">Frequency band, filters and processing<\/label><input id=\"zb-band\" type=\"text\" maxlength=\"220\" required><\/div>\n        <div class=\"zb-field\"><label for=\"zb-instrument\">Instrument, calibration and uncertainty record<\/label><input id=\"zb-instrument\" type=\"text\" maxlength=\"260\" required><\/div>\n      <\/div><\/section>\n\n      <section class=\"zb-card zb-section\"><h2>Exact source and entered boundaries<\/h2><div class=\"zb-grid\">\n        <div class=\"zb-field zb-wide\"><label for=\"zb-source\">Document designation, edition\/year and controlled copy ID<\/label><input id=\"zb-source\" type=\"text\" maxlength=\"320\" required placeholder=\"Do not write only \u2018ISO 20816\u2019\"><\/div>\n        <div class=\"zb-field\"><label for=\"zb-source-status\">Source status<\/label><select id=\"zb-source-status\" required><option value=\"\">Select verified status<\/option><option value=\"current\">Current published licensed standard<\/option><option value=\"approved\">Manufacturer\/operator approved criterion<\/option><option value=\"withdrawn\">Withdrawn source \u2014 historical comparison only<\/option><option value=\"draft\">Draft\/unpublished source \u2014 research only<\/option><\/select><\/div>\n        <div class=\"zb-field\"><label for=\"zb-purpose\">Comparison purpose<\/label><select id=\"zb-purpose\" required><option value=\"\">Select declared purpose<\/option><option value=\"monitoring\">Operational monitoring record<\/option><option value=\"acceptance\">Acceptance record<\/option><option value=\"historical\">Historical\/research comparison<\/option><option value=\"other\">Other controlled purpose<\/option><\/select><\/div>\n        <div class=\"zb-field zb-wide\"><label for=\"zb-location-source\">Exact clause, table, annex and page plus source-defined machine group<\/label><textarea id=\"zb-location-source\" maxlength=\"900\" required placeholder=\"Record the exact location and the source's own group\/support\/configuration wording\"><\/textarea><\/div>\n        <div class=\"zb-field\"><label for=\"zb-value\">Measured value in the declared unit<\/label><input id=\"zb-value\" type=\"text\" inputmode=\"decimal\" required><\/div>\n        <div class=\"zb-field\"><label for=\"zb-equality\">Exact-boundary convention from the source<\/label><select id=\"zb-equality\" required><option value=\"\">Select documented convention<\/option><option value=\"upper\">Equality enters the higher letter band<\/option><option value=\"lower\">Equality remains in the lower letter band<\/option><\/select><\/div>\n        <div class=\"zb-field\"><label for=\"zb-ab\">Entered A\/B boundary<\/label><input id=\"zb-ab\" type=\"text\" inputmode=\"decimal\" required><span class=\"zb-hint\">No default is provided.<\/span><\/div>\n        <div class=\"zb-field\"><label for=\"zb-bc\">Entered B\/C boundary<\/label><input id=\"zb-bc\" type=\"text\" inputmode=\"decimal\" required><\/div>\n        <div class=\"zb-field\"><label for=\"zb-cd\">Entered C\/D boundary<\/label><input id=\"zb-cd\" type=\"text\" inputmode=\"decimal\" required><\/div>\n        <div class=\"zb-field\"><label for=\"zb-reviewer\">Accountable reviewer \/ procedure reference<\/label><input id=\"zb-reviewer\" type=\"text\" maxlength=\"260\" required><\/div>\n      <\/div><\/section>\n\n      <section class=\"zb-card zb-section\"><fieldset><legend>Evidence gates<\/legend><p>The arithmetic can be displayed with incomplete gates, but it is not a reviewed controlled-source comparison until all eight are documented.<\/p><div class=\"zb-checks\">\n        <label class=\"zb-check\" for=\"zb-ev-scope\"><input id=\"zb-ev-scope\" type=\"checkbox\"><span><strong>Machine scope matches.<\/strong> Machine type, coupling, power, speed, bearing, support and excluded\/special configuration checks were performed against the exact source.<\/span><\/label>\n        <label class=\"zb-check\" for=\"zb-ev-source\"><input id=\"zb-ev-source\" type=\"checkbox\"><span><strong>Source status and controlled copy verified.<\/strong> Current\/approved status, edition, amendments and replacement lifecycle are recorded.<\/span><\/label>\n        <label class=\"zb-check\" for=\"zb-ev-table\"><input id=\"zb-ev-table\" type=\"checkbox\"><span><strong>Boundaries transcribed and independently checked.<\/strong> Exact clause\/table\/page, group and all three numbers were double-checked from the legal source.<\/span><\/label>\n        <label class=\"zb-check\" for=\"zb-ev-measurement\"><input id=\"zb-ev-measurement\" type=\"checkbox\"><span><strong>Measurement definition matches.<\/strong> Quantity, unit, RMS\/peak convention, band, filters, location, direction and operating state match the criterion.<\/span><\/label>\n        <label class=\"zb-check\" for=\"zb-ev-boundary\"><input id=\"zb-ev-boundary\" type=\"checkbox\"><span><strong>Boundary ownership is documented.<\/strong> The source rule for a value exactly equal to A\/B, B\/C or C\/D is recorded.<\/span><\/label>\n        <label class=\"zb-check\" for=\"zb-ev-change\"><input id=\"zb-ev-change\" type=\"checkbox\"><span><strong>Magnitude and change context reviewed.<\/strong> Baseline\/change criteria and applicable manufacturer\/operator limits were considered outside this scalar comparison.<\/span><\/label>\n        <label class=\"zb-check\" for=\"zb-ev-quality\"><input id=\"zb-ev-quality\" type=\"checkbox\"><span><strong>Measurement quality is adequate.<\/strong> Instrument calibration, mounting, repeatability, uncertainty and external vibration influence are acceptable.<\/span><\/label>\n        <label class=\"zb-check\" for=\"zb-ev-decision\"><input id=\"zb-ev-decision\" type=\"checkbox\"><span><strong>Decision procedure is separate.<\/strong> Alarm, maintenance, load and shutdown actions come from approved plant\/manufacturer logic and accountable review, not this letter band.<\/span><\/label>\n      <\/div><\/fieldset><div class=\"zb-actions\"><button class=\"zb-primary\" type=\"submit\">Compare with entered boundaries<\/button><button class=\"zb-secondary\" id=\"zb-clear\" type=\"button\">Clear<\/button><\/div><\/section>\n    <\/form>\n\n    <section id=\"zb-result\" class=\"zb-result\" role=\"status\" aria-live=\"polite\"><h2 id=\"zb-result-title\">Not compared<\/h2><p id=\"zb-result-summary\"><\/p><ul id=\"zb-errors\" class=\"zb-errors\"><\/ul><div class=\"zb-values\">\n      <div class=\"zb-value\"><span>Entered-criteria letter band<\/span><strong id=\"zb-out-band\">&#8211;<\/strong><\/div>\n      <div class=\"zb-value\"><span>Measured value<\/span><strong id=\"zb-out-value\">&#8211;<\/strong><\/div>\n      <div class=\"zb-value\"><span>Entered boundary sequence<\/span><strong id=\"zb-out-boundaries\">&#8211;<\/strong><\/div>\n      <div class=\"zb-value\"><span>Equality convention<\/span><strong id=\"zb-out-equality\">&#8211;<\/strong><\/div>\n    <\/div><\/section>\n\n    <section class=\"zb-section\"><h2>Comparison rule and strict boundary<\/h2><p>This is a general ordered-threshold comparison, not a formula or table issued by ISO.<\/p>\n      <div class=\"zb-formula\">Required: 0 &lt; T_AB &lt; T_BC &lt; T_CD, all in exactly the same documented unit and convention as X<\/div>\n      <div class=\"zb-formula\">If equality enters the higher band: A when X &lt; T_AB; B when T_AB <= X &lt; T_BC; C when T_BC <= X &lt; T_CD; D when X >= T_CD<\/div>\n      <div class=\"zb-formula\">If equality remains in the lower band: A when X <= T_AB; B when T_AB &lt; X <= T_BC; C when T_BC &lt; X <= T_CD; D when X &gt; T_CD<\/div>\n      <div class=\"zb-boundary\"><strong>A letter is not an operating instruction<\/strong>The result is only the band produced by the entered numbers and declared equality rule. It does not establish ISO applicability, overall machine condition, a diagnosis, alarm setpoint, maintenance priority, load reduction or shutdown action.<\/div>\n      <p>For a dedicated current-scope evidence package before applying ISO 20816-3, use the <a href=\"\/calculators\/vibration-iso20816-3-industrial\/\">Industrial Machinery Vibration Evaluation Evidence Worksheet<\/a>.<\/p>\n    <\/section>\n\n    <section class=\"zb-section\"><h2>Verified lifecycle and evidence boundary<\/h2><div class=\"zb-table-wrap\"><table><thead><tr><th>ID<\/th><th>Source<\/th><th>Verified public fact<\/th><th>Boundary on this page<\/th><\/tr><\/thead><tbody>\n      <tr id=\"source-S1\"><td>S1<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/78311.html\" target=\"_blank\" rel=\"noopener\">ISO 20816-3:2022, Edition 1<\/a><\/td><td>Current published Part 3, stage 90.92. Public scope: coupled industrial machinery above 15 kW, 120 to 30 000 r\/min; steady values and changes; covered\/excluded configurations; machine-generated vibration.<\/td><td>Public record does not expose the former class-I\/II\/III\/IV mapping or twelve numerical boundaries.<\/td><\/tr>\n      <tr id=\"source-S2\"><td>S2<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/89922.html\" target=\"_blank\" rel=\"noopener\">ISO\/FDIS 20816-3, Edition 2<\/a><\/td><td>Under development at stage 50.00 and intended to replace the 2022 edition.<\/td><td>Not a current published requirement; no draft table is reproduced.<\/td><\/tr>\n      <tr id=\"source-S3\"><td>S3<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/50528.html\" target=\"_blank\" rel=\"noopener\">ISO 10816-3:2009, Edition 2<\/a><\/td><td>Withdrawn in 2022 and revised by ISO 20816-3:2022. Its official scope began above 15 kW and ended at 15 000 r\/min.<\/td><td>Cannot validate a current chart or a <=15 kW Class I.<\/td><\/tr>\n      <tr id=\"source-S4\"><td>S4<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/63180.html\" target=\"_blank\" rel=\"noopener\">ISO 20816-1:2016, Edition 1<\/a><\/td><td>Current published Part 1, stage 90.92. Public scope covers defined methods\/limitations, magnitude and change, operational monitoring, acceptance and operational-limit guidance.<\/td><td>Does not make one scalar plus a legacy class a complete machine decision.<\/td><\/tr>\n      <tr id=\"source-S5\"><td>S5<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/88197.html\" target=\"_blank\" rel=\"noopener\">ISO\/FDIS 20816-1, Edition 2<\/a><\/td><td>Under development at stage 50.00 and intended to replace the 2016 edition.<\/td><td>Not yet current; future lifecycle recheck required.<\/td><\/tr>\n      <tr id=\"source-S6\"><td>S6<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/18866.html\" target=\"_blank\" rel=\"noopener\">ISO 10816-1:1995, Edition 1<\/a><\/td><td>Withdrawn in 2016 and revised by ISO 20816-1:2016; it had replaced ISO 2372 and ISO 3945.<\/td><td>Historical lifecycle only; protected tables are not reproduced.<\/td><\/tr>\n      <tr id=\"source-S7\"><td>S7<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/7212.html\" target=\"_blank\" rel=\"noopener\">ISO 2372:1974, Edition 1<\/a><\/td><td>Withdrawn in 1995 and revised by ISO 10816-1:1995.<\/td><td>Historical lifecycle only, not current ISO 20816-3 evidence.<\/td><\/tr>\n      <tr id=\"source-S8\"><td>S8<\/td><td><a href=\"https:\/\/www.bksv.com\/media\/doc\/br0094.pdf\" target=\"_blank\" rel=\"noopener\">Br\u00fcel &amp; Kj\u00e6r, Measuring Vibration, BR 0094-11<\/a><\/td><td>Its historical quick-look severity illustration is described as extracted from ISO 2372\/2373 and old national recommendations; it separately says frequency analysis is necessary for diagnostic use.<\/td><td>Historical context, not proof of the former web table or automatic actions.<\/td><\/tr>\n    <\/tbody><\/table><\/div><div class=\"zb-alert\" style=\"margin-top:16px\"><strong>NEEDS_LICENSED_SOURCE<\/strong>Exact current numerical criteria, group\/support definitions, measurement band and convention, steady-value and change rules, boundary inclusivity and operational-limit guidance require the legally available complete applicable document. No clause, table or limit is guessed here.<\/div><\/section>\n\n    <section class=\"zb-section\"><h2>Corrections made in this audit<\/h2>\n      <details><summary>The mislabeled four-class chart was removed<\/summary><p>The old Class I through IV model included a <=15 kW class while claiming ISO 10816-3, whose official scope begins above 15 kW. The twelve boundaries are no longer embedded or presented as current ISO 20816 values.<\/p><\/details>\n      <details><summary>Withdrawn and draft documents are separated from current standards<\/summary><p>ISO 10816-1 and ISO 10816-3 are withdrawn. Current ISO 20816-1:2016 and ISO 20816-3:2022 remain published while Edition 2 FDIS replacements are still under development.<\/p><\/details>\n      <details><summary>Automatic alarm and shutdown language was removed<\/summary><p>A scalar band cannot replace plant protection logic, manufacturer limits, change criteria, diagnostics and accountable engineering review.<\/p><\/details>\n      <details><summary>Measurement and source identity are now explicit<\/summary><p>The worksheet records machine\/configuration, operating state, location\/direction, quantity\/unit\/convention, frequency processing, instrument\/uncertainty and the exact controlled source location.<\/p><\/details>\n      <details><summary>Boundary equality is no longer hidden<\/summary><p>The old code used strict less-than comparisons without documenting which band owns an exact threshold. The replacement requires the rule to be declared from the source.<\/p><\/details>\n      <details><summary>Unsafe defaults and implicit persistence were removed<\/summary><p>No values, classes or limits are prefilled. Automatic calculation, local history, clipboard export and dynamic HTML generation were removed; changed inputs make a result stale.<\/p><\/details>\n    <\/section>\n    <div class=\"zb-footer\">Engineering boundary: this worksheet performs only an ordered comparison against user-entered, source-controlled boundaries. It does not contain ISO criteria or decide applicability, machine condition, diagnosis, alarm, maintenance, load or shutdown. Last technical review: 17 July 2026.<\/div>\n  <\/div>\n<\/main>\n<script>\n(function(){'use strict';var root=document.getElementById('vbm-zb');if(!root)return;function byId(id){return document.getElementById(id)}function parseDecimal(raw){var s=String(raw).trim();if(!\/^[+]?(?:\\d+(?:[.,]\\d*)?|[.,]\\d+)$\/.test(s)||(\/[.]\/.test(s)&&\/,\/.test(s)))return null;var n=Number(s.replace(',','.'));return Number.isFinite(n)?n:null}function fmt(n){var a=Math.abs(n);if(n===0)return'0';if(a>=1000000||a<0.0001)return n.toExponential(6);return Number(n.toPrecision(9)).toString()}function setList(items){var list=byId('zb-errors');while(list.firstChild)list.removeChild(list.firstChild);items.forEach(function(item){var li=document.createElement('li');li.textContent=item;list.appendChild(li)})}function setState(kind,title,summary){var box=byId('zb-result');box.className='zb-result zb-visible zb-'+kind;byId('zb-result-title').textContent=title;byId('zb-result-summary').textContent=summary}function clearOutputs(){['zb-out-band','zb-out-value','zb-out-boundaries','zb-out-equality'].forEach(function(id){byId(id).textContent='-'})}function band(x,ab,bc,cd,equality){if(equality==='upper')return x<ab?'A':x<bc?'B':x<cd?'C':'D';return x<=ab?'A':x<=bc?'B':x<=cd?'C':'D'}var form=byId('zb-form'),result=byId('zb-result');function stale(){if(result.classList.contains('zb-visible')&&!result.classList.contains('zb-stale')){clearOutputs();setList([]);setState('stale','Result is stale','The machine, measurement, source, boundaries or evidence changed. 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