{"id":7941,"date":"2020-12-21T16:08:44","date_gmt":"2020-12-21T16:08:44","guid":{"rendered":"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/tempo-e-frequencia\/"},"modified":"2023-02-13T13:12:25","modified_gmt":"2023-02-13T13:12:25","slug":"time-and-frequency","status":"publish","type":"page","link":"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/time-and-frequency\/","title":{"rendered":"Time and frequency"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-sizes-top:0px;--awb-border-sizes-bottom:0px;--awb-border-sizes-left:0px;--awb-border-sizes-right:0px;--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:0px;--awb-padding-right:0px;--awb-padding-bottom:0px;--awb-padding-left:0px;--awb-margin-top:0px;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-padding-bottom:3%;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element \" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\" class=\"image-magnify\" class=\"image-scroll\"><img decoding=\"async\" width=\"2005\" height=\"265\" title=\"header_metrologia_v2_wireless_EN\" src=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN.jpg\" data-orig-src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/header_metrologia_v2_wireless_EN.jpg\" alt class=\"lazyload img-responsive wp-image-7953\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%272005%27%20height%3D%27265%27%20viewBox%3D%270%200%202005%20265%27%3E%3Crect%20width%3D%272005%27%20height%3D%27265%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-200x26.jpg 200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-400x53.jpg 400w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-600x79.jpg 600w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-800x106.jpg 800w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-1200x159.jpg 1200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN.jpg 2005w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 1024px) 100vw, (max-width: 640px) 100vw, 2005px\" \/><\/span><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start\" style=\"max-width:1420.64px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_3 1_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:33.333333333333%;--awb-margin-top-large:0px;--awb-spacing-right-large:5.76%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:5.76%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-widget fusion-widget-element fusion-widget-area fusion-content-widget-area wpWidget-1 menu_v_template1 fusion_widget_vertical_menu no-divider-color\" style=\"--awb-fusion-border-size:0px;--awb-fusion-border-style:solid;\"><div class=\"widget avada_vertical_menu\"><style>#fusion-vertical-menu-widget-avada-vertical-menu-widget-1-nav ul.menu li a {font-size:14px;}<\/style><nav id=\"fusion-vertical-menu-widget-avada-vertical-menu-widget-1-nav\" class=\"fusion-vertical-menu-widget fusion-menu hover left no-border\" aria-label=\"Secondary navigation\"><ul id=\"menu-metrology\" class=\"menu\"><li id=\"menu-item-8469\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8469\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/acceleration-vibrations\/\"><span class=\"link-text\"> Acceleration vibrations<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8650\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8650\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/breath-analyzer\/\"><span class=\"link-text\"> Breath analyzer<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8501\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8501\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/eletricity-and-magnetism\/\"><span class=\"link-text\"> Eletricity and magnetism<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8564\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8564\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/force\/\"><span class=\"link-text\"> Force<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8670\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8670\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/gas-analysers\/\"><span class=\"link-text\"> Gas analysers<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8491\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8491\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/length\/\"><span class=\"link-text\"> Length<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8653\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8653\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/mass-solid-density\/\"><span class=\"link-text\"> Mass solid density<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8656\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8656\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/photometry-radiometry-radiofrequencies\/\"><span class=\"link-text\"> Photometry radiometry radiofrequencies<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8005\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8005\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/pressure\/\"><span class=\"link-text\"> Pressure<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8047\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8047\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/properties-of-liquids\/\"><span class=\"link-text\"> Properties of liquids<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8586\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8586\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/reference-gas\/\"><span class=\"link-text\"> Reference gas<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-7987\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-7987\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/temperature\/\"><span class=\"link-text\"> Temperature<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-7962\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-7962\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/time-and-frequency\/\"><span class=\"link-text\"> Time and frequency<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-7963\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-7963\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/volume-and-flow\/\"><span class=\"link-text\"> Volume and flow<\/span><span class=\"arrow\"><\/span><\/a><\/li><\/ul><\/nav><\/div><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_2_3 2_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:66.666666666667%;--awb-margin-top-large:0px;--awb-spacing-right-large:2.88%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:2.88%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-two subtitulo-sh2\" style=\"--awb-text-color:#f24949;--awb-font-size:20px;\"><h2 class=\"title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;font-size:1em;--fontSize:20;--minFontSize:20;line-height:2;\">TIME AND FREQUENCY<\/h2><\/div><div class=\"fusion-image-element \" style=\"text-align:right;--awb-margin-top:20px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-2 hover-type-none\" class=\"image-magnify\" class=\"image-scroll\"><img decoding=\"async\" width=\"200\" height=\"200\" alt=\"SI Const s_delta nu\" title=\"logo SI Const s_delta nu\" src=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-s_delta-nu.png\" data-orig-src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/\/logo-SI-Const-s_delta-nu-200x200.png\" class=\"lazyload img-responsive wp-image-4756\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%272481%27%20height%3D%272481%27%20viewBox%3D%270%200%202481%202481%27%3E%3Crect%20width%3D%272481%27%20height%3D%272481%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-s_delta-nu-200x200.png 200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-s_delta-nu-400x400.png 400w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-s_delta-nu-600x600.png 600w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-s_delta-nu-800x800.png 800w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-s_delta-nu-1200x1200.png 1200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-s_delta-nu.png 2481w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 1024px) 100vw, (max-width: 640px) 100vw, 1200px\" \/><\/span><\/div><div class=\"fusion-text fusion-text-1 template-1-text\" style=\"--awb-margin-top:20px;\"><p>The Time and Frequency Laboratory has the mission to realize the national atomic time scale Universal Coordinate Time (UTC-IPQ) by means of three cesium clocks and contributes to the International Atomic Time (TAI).<\/p>\n<p>In the field of Kinetic Metrology, the Laboratory performs the calibration of speedometers, such as GPS receivers, for speed measurement of road vehicles.<\/p>\n<\/div><div class=\"accordian fusion-accordian toggle-control toggle-title-control\" style=\"--awb-border-size:1px;--awb-icon-size:13px;--awb-content-font-size:var(--awb-typography4-font-size);--awb-icon-alignment:right;--awb-hover-color:#f9f9f9;--awb-border-color:#cccccc;--awb-background-color:#ffffff;--awb-divider-color:var(--awb-color3);--awb-divider-hover-color:var(--awb-color3);--awb-icon-color:#ffffff;--awb-title-color:var(--awb-color8);--awb-content-color:var(--awb-color8);--awb-icon-box-color:#f24949;--awb-toggle-hover-accent-color:#f24949;--awb-title-font-family:var(--awb-typography1-font-family);--awb-title-font-weight:var(--awb-typography1-font-weight);--awb-title-font-style:var(--awb-typography1-font-style);--awb-title-font-size:16px;--awb-title-letter-spacing:1px;--awb-title-line-height:1.5;--awb-content-font-family:var(--awb-typography4-font-family);--awb-content-font-weight:var(--awb-typography4-font-weight);--awb-content-font-style:var(--awb-typography4-font-style);\"><div class=\"panel-group fusion-toggle-icon-right fusion-toggle-icon-boxed\" id=\"accordion-7941-1\"><div class=\"fusion-panel panel-default panel-0b3d6578b791404c3 fusion-toggle-has-divider\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_0b3d6578b791404c3\"><a aria-expanded=\"false\" aria-controls=\"0b3d6578b791404c3\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-7941-1\" data-target=\"#0b3d6578b791404c3\" href=\"#0b3d6578b791404c3\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">FIELDS OF ACTIVITY<\/span><\/a><\/h4><\/div><div id=\"0b3d6578b791404c3\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_0b3d6578b791404c3\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p style=\"padding-left: 40px;\">The areas of activity of the Time and Frequency Laboratory, are:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Kinetic Metrology \u2013 calibration of GPS receivers;<\/li>\n<li>Time:\n<ul>\n<li>Dissemination of the second;<\/li>\n<li>Calibration of oscillators disciplined to GNSS<\/li>\n<\/ul>\n<\/li>\n<li>Frequency \u2013 calibration of frequency meters;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\">In an advanced stage of obtaining international recognition:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Time intervals.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-acdd501b0cf6de383 fusion-toggle-has-divider\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_acdd501b0cf6de383\"><a aria-expanded=\"false\" aria-controls=\"acdd501b0cf6de383\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-7941-1\" data-target=\"#acdd501b0cf6de383\" href=\"#acdd501b0cf6de383\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">TRACEABILITY<\/span><\/a><\/h4><\/div><div id=\"acdd501b0cf6de383\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_acdd501b0cf6de383\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p style=\"padding-left: 40px;\">The <strong>second<\/strong>, symbol s, is the SI unit of time.<\/p>\n<p style=\"padding-left: 40px;\">It is defined by taking the fixed numerical value of the caesium frequency \u0394v<sub>Cs<\/sub>, the unperturbed ground-state hyperfine transition frequency of the caesium \u2013 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s<sup>\u20131<\/sup>.<\/p>\n<p style=\"padding-left: 40px;\"><strong>Derived Units<\/strong><\/p>\n<p style=\"padding-left: 40px;\">The<strong> hertz<\/strong> (Hz) defined as:<\/p>\n<p style=\"padding-left: 40px;\">The inverse of the second (s<sup>-1<\/sup>)<\/p>\n<p style=\"padding-left: 40px;\">The international time frequency scale is the UTC time scale, maintained by the BIPM (Bureau International des Poids et Mesures).<\/p>\n<p style=\"padding-left: 40px;\">The time scale TAI is established by the BIPM based on the data collected from several atomic oscillators of various institutions that realize the primary standard of time. Data from each of these oscillators is subjected to BIPM through observations in common view mode, from the satellites of GNSS (Global Navigation Satellite System). The results of these contributions are published monthly in the &#8220;Circular T&#8221; of the BIPM.<\/p>\n<p style=\"padding-left: 40px;\">The BIPM is responsible for maintaining the UTC time scale and ensuring traceability to the second (SI) of the local timescales UTC (IPQ), through key comparison CCTF-K001.UTC.<\/p>\n<p style=\"padding-left: 40px;\">The definition of UTC is established through cooperation between BIPM and the International Telecommunication Union (ITU). UTC is kept in sync with the time of Earth&#8217;s rotation, taking into account the values provided by the International Earth Rotation Service (IERS), which establishes the dates for the introduction of leap seconds as well as relevant information to realize UTC . The variation rate between UTC and TAI is exactly the same but they diverge by an integer number of seconds, the leap seconds.<\/p>\n<p style=\"padding-left: 40px;\"><strong>External document:<\/strong><\/p>\n<p style=\"padding-left: 40px;\"><a href=\"https:\/\/www.bipm.org\/utils\/en\/pdf\/si-mep\/SI-App2-second.pdf\"><i><span data-contrast=\"auto\">Mise en pratique<\/span><\/i><span data-contrast=\"auto\">\u00a0for the definition of the\u00a0<\/span><span data-contrast=\"auto\">second<\/span><span data-contrast=\"auto\">\u00a0in the SI<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/a><\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-6218f54ff1fd3fc5f fusion-toggle-has-divider\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_6218f54ff1fd3fc5f\"><a aria-expanded=\"false\" aria-controls=\"6218f54ff1fd3fc5f\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-7941-1\" data-target=\"#6218f54ff1fd3fc5f\" href=\"#6218f54ff1fd3fc5f\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">AVAILABLE CALIBRATION SERVICES<\/span><\/a><\/h4><\/div><div id=\"6218f54ff1fd3fc5f\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_6218f54ff1fd3fc5f\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p style=\"padding-left: 40px;\">Get to know\u00a0<a href=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/LTF_Servic\u0327os_EN.pdf\">here\u00a0<\/a>available calibration services on the volume laboratory.<\/p>\n<p style=\"padding-left: 40px;\"><strong>International Recognition<\/strong><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\"><a href=\"https:\/\/www.bipm.org\/en\/bipm-services\/timescales\/time-ftp\/Circular-T.html\" target=\"_blank\" rel=\"noopener noreferrer\">Circular-T<\/a><\/span><\/p>\n<p style=\"padding-left: 40px;\">Calibration services listed are registered as\u00a0<a href=\"https:\/\/www.bipm.org\/kcdb\/cmc\/search?domain=PHYSICS&amp;areaId=2&amp;keywords=portugal\">Calibration and Measurement Capabilities \u2013 CMCs\u00a0<\/a>in the BIPM database.<\/p>\n<p style=\"padding-left: 40px;\"><span data-ccp-props=\"{'201341983':0,'335559739':160,'335559740':259}\"> <img decoding=\"async\" class=\"lazyload alignleft wp-image-4727 size-fusion-200\" src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-CIPM-MRA-1-200x98.jpg\" data-orig-src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-CIPM-MRA-1-200x98.jpg\" alt=\"\" width=\"200\" height=\"98\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27200%27%20height%3D%2798%27%20viewBox%3D%270%200%20200%2098%27%3E%3Crect%20width%3D%27200%27%20height%3D%2798%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-CIPM-MRA-1-200x98.jpg 200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-CIPM-MRA-1-300x147.jpg 300w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-CIPM-MRA-1.jpg 391w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/span><\/p>\n<p style=\"padding-left: 40px;\"><img decoding=\"async\" class=\"lazyload alignleft wp-image-4729 size-fusion-200\" src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-KBCD-200x51.jpg\" data-orig-src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-KBCD-200x51.jpg\" alt=\"\" width=\"200\" height=\"51\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27200%27%20height%3D%2751%27%20viewBox%3D%270%200%20200%2051%27%3E%3Crect%20width%3D%27200%27%20height%3D%2751%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD-200x51.jpg 200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD-300x76.jpg 300w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD-400x102.jpg 400w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD-600x153.jpg 600w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD.jpg 612w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-11c5b32c1e4333ee0 fusion-toggle-has-divider\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_11c5b32c1e4333ee0\"><a aria-expanded=\"false\" aria-controls=\"11c5b32c1e4333ee0\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-7941-1\" data-target=\"#11c5b32c1e4333ee0\" href=\"#11c5b32c1e4333ee0\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">CONTACTS<\/span><\/a><\/h4><\/div><div id=\"11c5b32c1e4333ee0\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_11c5b32c1e4333ee0\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\"><b>Carlos Pires<\/b><\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">Tel.: +351 212 948 1<\/span><span data-contrast=\"auto\">58<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">E-mail: <\/span><a href=\"mailto:carlosp@ipq.pt\"><span data-contrast=\"none\">carlosp@ipq.pt<\/span><\/a><\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-image-carousel fusion-image-carousel-auto fusion-image-carousel-1 fusion-carousel-border\"><div class=\"awb-carousel awb-swiper awb-swiper-carousel\" data-autoplay=\"yes\" data-columns=\"1\" data-itemmargin=\"13\" data-itemwidth=\"180\" data-touchscroll=\"no\" data-imagesize=\"auto\" style=\"--awb-columns:1;\"><div class=\"swiper-wrapper awb-image-carousel-wrapper fusion-flex-align-items-center\"><div class=\"swiper-slide\"><div class=\"fusion-carousel-item-wrapper\"><div class=\"fusion-image-wrapper hover-type-none\"><img decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/DMET-LTF-101_V1.png\" class=\"attachment-full size-full lazyload\" alt=\"\" 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aria-hidden=\"true\"><\/i><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":58,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"100-width.php","meta":{"_acf_changed":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"class_list":["post-7941","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Time and frequency - IPQ<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Time and frequency - 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