BIPM - calibration

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href="https://web-static.archive.org/_static/css/iconochive.css?v=3PDvdIFv" />  <meta http-equiv="X-UA-Compatible" content="IE=8"/> <title>BIPM - calibration</title> <meta name="description" content="Calibration and measurement services"> <script language="javascript" src="/web/20200528194556js_/https://www.bipm.org/utils/onLoad.js"> </script> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//web.archive.org/web/20200528194556/https://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-38070491-1', 'auto'); ga('send', 'pageview'); </script> <script src="/web/20200528194556js_/https://www.bipm.org/utils/jquery/jquery-1.10.2.min.js"></script> <script 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width="180"></td><td width="530"></td><td width="270"></td><td width="10"></td></tr> <tr height="90"> <td width="10"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="90"></td> <td width="180" valign="center" align="left"><a href="/web/20200528194556/https://www.bipm.org/en/about-us/" title="BIPM home page"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/logoBIPM-RB.jpg" border="0"></a></td> <td width="530" valign="center" align="center" class="intro">    the intergovernmental organization through which Member States act together<br>      on matters related to measurement science and measurement standards.</td> <td width="270" align="center" valign="top"> <script language="javascript"> function ActionForm(f) { f.q.style.background = "white"; } </script> <form name="search" action="https://web.archive.org/web/20200528194556/https://search.bipm.org/bipm/en/C="> <table width="180" align="right" valign="top" 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href="/web/20200528194556/https://www.bipm.org/en/worldwide-metrology/metre-convention/" target="_self">The Metre Convention</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/worldwide-metrology/cgpm/" target="_self">The General Conference (CGPM)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cipm/" target="_self">The International Committee (CIPM)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/" target="_self">CIPM Consultative Committees (CCs)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/worldwide-metrology/national/" target="_self">National Metrology Institutes (NMIs)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/worldwide-metrology/regional/" target="_self">Regional Metrology Organizations (RMOs)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/jc/" target="_self">Joint Committees</a></li> <li><a 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<li><a href="/web/20200528194556/https://www.bipm.org/en/cipm-mra/cipm-mra-documents/" target="_self">CIPM MRA documents</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/cipm-mra/approval-process.html" target="_self">CMC approval process</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/cipm-mra/logo/" target="_self">Use of the CIPM MRA logo</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/jc/jcrb/" target="_self">JCRB: Joint Committee of the RMOs and the BIPM</a></li> </ul> </li> <li><a href="/web/20200528194556/https://www.bipm.org/en/measurement-units/" target="_self"> SI units</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/en/measurement-units/" target="_self">The International System of Units (SI)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/si-brochure/" target="_self">SI Brochure</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/si-brochure/appendix1.html" target="_self">Decisions of the CGPM and the CIPM</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/mises-en-pratique/" target="_self">How to realize the definitions in practice</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/measurement-units/base-units.html" target="_self">Unit definitions</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/measurement-units/prefixes.html" target="_self">SI prefixes</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/si-download-area/" target="_self">Revised SI: Download area</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/measurement-units/history-si/" target="_self">Brief history of the SI</a></li> </ul> </li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/" target="_self"> Services</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/comparisons/" target="_self">Comparisons piloted by the BIPM</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/" target="_self">Calibration and measurement services</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/tai/" target="_self">Timescales</a></li> <li><a href="https://web.archive.org/web/20200528194556/https://www.bipm.org/kcdb" target="_self"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img2/logo_kcdb_pt.gif" alt="KCDB" vspace="2"></a></li> <li><a href="https://web.archive.org/web/20200528194556/https://www.bipm.org/jctlm/" target="_self"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img2/logo_jctlm_pt.gif" alt="JCTLM" vspace="2"></a></li> <li><a href="https://web.archive.org/web/20200528194556/http://imrr.bipm.org/" target="_self"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img2/logo_imrr_pt.gif" alt="IMRR" vspace="2"></a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/si-brochure/" target="_self">SI Brochure</a></li> <li><a href="https://web.archive.org/web/20200528194556/http://iopscience.iop.org/0026-1394/" target="metrologia"><i>Metrologia</i></a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/conference-centre/" target="_self">Meetings</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/mises-en-pratique/standard-frequencies.html" target="_self">Recommended values of standard frequencies</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/ionizing/radionuclides/sir/" target="_self">International Reference System (SIR)</a></li> </ul> </li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/" target="_self"> Publications</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/si-brochure/" target="_self">SI Brochure</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/mises-en-pratique/" target="_self"><i>Mises en pratique</i></a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/directors-report/" target="_self">Annual Director's Report</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cipm/publications-cipm.html#ra" target="_self">Financial Report</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cipm/publications-cipm.html#no" target="_self">Notification of Contributions</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/" target="_self">Official proceedings</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/worldwide-metrology/cgpm/resolutions.html" target="_self">Resolutions of the General Conference</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/open-literature/" target="_self">Scientific output</a></li> <li><a href="https://web.archive.org/web/20200528194556/http://iopscience.iop.org/0026-1394/" target="metrologia"><i>Metrologia</i></a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/guides/" target="_self">Guides in Metrology</a></li> </ul> </li> <li><a href="/web/20200528194556/https://www.bipm.org/en/conference-centre/diary/" target="_self"> Meetings</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/en/conference-centre/diary/" target="_self">List of meetings</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/conference-centre/" target="_self">BIPM Conference Centre</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/conference-centre/directions/" target="_self">How to get to the BIPM</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/cgpm-2018/" target="_self">General Conference (CGPM)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cipm/" target="_self">International Committee (CIPM)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/" target="_self">Consultative Committees and Working Groups</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/conference-centre/bipm-workshops/" target="_self">BIPM Workshops</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/conference-centre/other-events/" target="_self">Other BIPM events</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/" target="_self">Meeting reports</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/worldwide-metrology/metrology-events.html" target="_self">External events</a></li> </ul> </li> </ul> </div> </td> </tr> </table>   <table width="1000" height="25" border="0" cellspacing="0" cellpadding="0"> <tr height="25"> <td height="25" bgcolor="#DBE3EB"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="10"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="10"></td> <td class="navigation" width="100%">> You are here: <a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/" class="navigation">BIPM services</a> > calibration </td> <td width="10"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="10"></td> </tr> </table> </td> </tr> </table>   <center> <table width="1000" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="10" height="50"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="50"></td> <td align="left" width="100%" height="50" background="/web/20200528194556im_/https://www.bipm.org/utils/common/img/cadre_trait.gif"> <table width="100%" border="0" background="/web/20200528194556im_/https://www.bipm.org/en/bipm-services/calibrations/"> <tr> <td align="left" class="GrosTitre"><div name="exalead-titre">Calibration and measurement services</div></td> </tr> </table> </td> <td width="10" height="50"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="50"></td> </tr> </table> </center>  <style type="text/css"> SELECT{color:#1E1182;font-size:9pt;font-family:arial;font-weight:normal} </style> <script> $(function() { $( "#tabs" ).tabs(); }); </script> <script language="JavaScript"> function GoToURL(formURL) { x = formURL.publication.selectedIndex if ( x == -1 ) { alert ("Nothing Selected") } else { location.href = formURL.publication.options[x].value } } </script> <table width="1000" border="0" cellspacing="0" cellpadding="0" valign="top"> <tr valign="top"> <td width="10"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="10"></td> <td width="100%" class="SousTitre" valign="top"> <div name="exalead">  <div id="tabs"> <ul> <li><a href="#intro">Introduction</a></li> <li><a href="#chemistry"> Chemistry </a></li> <li><a href="#electricity"> Electricity </a></li> <li><a href="#ionizing-radiation">Ionizing Radiation</a></li> <li><a href="#mass">   Mass   </a></li> </ul> <div id="intro"> <table width="100%" border="0" cellpadding="5"> <tr> <td> <p>The BIPM participates in (and pilots) a number of comparisons and, based on its associated measurement services, carries out calibrations in selected areas for NMIs of the Member States.</p> <p>The range and type of calibrations offered may change from time to time. For more information about reference standards kept at the BIPM, please click on the appropriate tabs above.</p> <br> <br> <form action="/web/20200528194556/https://www.bipm.org/jsp/en/SearchCA.jsp" method="GET" name="TheForm2"> <span class="GrosTitreMarineg"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/fleche_jaune.gif" width="29" height="14"> Calibration certificates issued by the BIPM:</span><br> <br> <center> <table width="80%" border="0"> <tr> <td colspan="5" class="txt12ptg">Select a year and/or a scientific department:<br><br></td> </tr> <tr> <td width="30"> </td> <td width="150"> <select name="dateCA"> <option value="All" selected>-- Select a year --</option> <option value="2019">2019</option> <option value="2018">2018</option> <option value="2017">2017</option> <option value="2016">2016</option> <option value="2015">2015</option> <option value="2014">2014</option> <option value="2013">2013</option> <option value="2012">2012</option> <option value="2011">2011</option> <option value="2010">2010</option> <option value="2009">2009</option> <option value="2008">2008</option> <option value="2007">2007</option> <option value="2006">2006</option> <option value="2005">2005</option> <option value="2004">2004</option> <option value="2003">2003</option> <option value="2002">2002</option> <option value="2001">2001</option> <option value="2000">2000</option> </select> </td> <td width="240" align="right">    <select name="sectionCA"> <option value="All" selected>-- Select a department --</option> <option value="chemistry">Chemistry Department </option> <option value="electricity">Electricity</option> <option value="ionizing">Ionizing Radiation Department</option> <option value="length">Length and frequency</option> <option value="mass">Mass</option> <option value="rad">Radiometry/Photometry</option> </select> </td> <td width="80"> </td> <td></td> </tr> <tr> <td colspan="5"> <br>  or <br><br> <span class="txt12ptg">Select a country:</span><br> </td> </tr> <tr> <td> </td> <td colspan="2"> <select name="countryCA"> <option value="All" selected>-- Select a Member State --</option> <option value="AR">Argentina</option> <option value="AU">Australia</option> <option value="AT">Austria</option> <option value="BE">Belgium</option> <option value="BR">Brazil</option> <option value="BG">Bulgaria</option> <option value="CA">Canada</option> <option value="CL">Chile</option> <option value="CN">China</option> <option value="CO">Colombia</option> <option value="HR">Croatia</option> <option value="CZ">Czechia</option> <option value="DK">Denmark</option> <option value="EG">Egypt</option> <option value="FI">Finland</option> <option value="FR">France</option> <option value="DE">Germany</option> <option value="GR">Greece</option> <option value="HU">Hungary</option> <option value="IN">India</option> <option value="ID">Indonesia</option> <option value="IR">Iran (Islamic Republic of)</option> <option value="IE">Ireland</option> <option value="IL">Israel</option> <option value="IT">Italy</option> <option value="JP">Japan</option> <option value="KZ">Kazakhstan</option> <option value="KE">Kenya</option> <option value="KR">Korea (Republic of)</option> <option value="MY">Malaysia</option> <option value="MX">Mexico</option> <option value="NL">Netherlands</option> <option value="NZ">New Zealand</option> <option value="NO">Norway</option> <option value="PK">Pakistan</option> <option value="PL">Poland</option> <option value="PT">Portugal</option> <option value="RO">Romania</option> <option value="RU">Russian Federation</option> <option value="SA">Saudi Arabia</option> <option value="RS">Serbia</option> <option value="SG">Singapore</option> <option value="SK">Slovakia</option> <option value="SI">Slovenia</option> <option value="ZA">South Africa</option> <option value="ES">Spain</option> <option value="SE">Sweden</option> <option value="CH">Switzerland</option> <option value="TH">Thailand</option> <option value="TR">Turkey</option> <option value="AE">United Arab Emirates</option> <option value="GB">United Kingdom</option> <option value="US">United States of America</option> <option value="UY">Uruguay</option> </select> </td> <td width="80"> </td> <td><input type="image" src="/web/20200528194556im_/https://www.bipm.org/utils/en/img/bt_soumettre_en.gif" alt="submit" border="0"></td> </tr> </table> </center> </form> </td> </tr> </table> </div> <div id="chemistry"> <table width="100%" cellpadding="5"> <tr> <td> <p><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/fleche_jaune.gif" width="29" height="14" alt=""> For those Member State NMIs that do not hold primary standards for ozone in air, the BIPM offers calibrations of secondary standard ozone analysers.</p> <p>Interested laboratories are invited to <a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/jviallon.html" class="introGras">contact Dr J. Viallon</a> for the relevant calibration request forms.</p> <br> <ul><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/cms_qm.html" class="introGras">Technical description of the service</a></ul> </td> </tr> </table> </div> <div id="electricity"> <table width="98%" cellpadding="5"> <tr> <td> <script> $(function() { $( "#tabs2" ).tabs(); }); </script> <div id="tabs2"> <ul> <li><a href="#introductory-notes">Introduction</a></li> <li><a href="#voltage">Voltage</a></li> <li><a href="#resistance">Resistance</a></li> <li><a href="#capacitance">Capacitance</a></li> </ul> <div id="introductory-notes"> <p><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/fleche_jaune.gif" width="29" height="14" alt=""> In order to shift some of our human resources to other essential activities, such as <a href="/web/20200528194556/https://www.bipm.org/en/bipm/electricity/calculable-capacitor/" class="introGras">establishing the calculable capacitor</a> and <a href="/web/20200528194556/https://www.bipm.org/en/bipm/electricity/watt-balance/" class="introGras">collaborating on the BIPM watt balance project</a>, while at the same time <a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccem/" class="introGras">continuing our support for the CCEM</a> and our <a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/comparisons/#PM" class="introGras">programme of comparisons</a> and calibrations, the CCEM (2007) agreed the following guidelines for the calibration of electrical standards at the BIPM:</p> <ul class="txt12pt"> <li>NMIs are asked to limit the frequency of their BIPM calibrations of resistors, capacitors and electronic voltage standards (Zeners) to once every two years for the same type of standard.</li> <br> <li>Users of the BIPM electrical calibration services should please limit the number of standards of a given type to no more than three standards of the same nominal value.</li> <br> <li>The calibrations will be carried out at the BIPM in two or three batches during the year.</li> </ul> <p>In addition to calibrations, <a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/comparisons/#PM" class="introGras">a bilateral comparison scheme</a> using conventional standards is offered to those laboratories that desire well-documented traceability to the BIPM voltage, resistance, and capacitance standards. This uses methods and procedures similar to those used in the former large-scale international comparisons and the results are proposed to the CCEM for inclusion in <a href="https://web.archive.org/web/20200528194556/http://kcdb.bipm.org/appendixB/default.asp" class="introGras">the CIPM MRA database</a>.</p> <p>Further information on the calibrations available for electrical standards of national laboratories is provided in the "Voltage", "Resistance" and "Capacitance" pages above.</p> <br> <ul><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/cms_em.html" class="introGras">Technical description of the service</a></ul> </div> <div id="voltage"> <p><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/fleche_jaune.gif" width="29" height="14" alt="">Electronic voltage standards referenced to Zener diodes are now widely used, creating the need to carry out calibrations at <nobr>10 V</nobr> as well as <nobr>1.018 V.</nobr> The BIPM uses <nobr>10 V</nobr> arrays of Josephson junctions as the reference voltage standard and all voltages are defined with respect to <nobr><i>K</i><sub>J</sub>=2<i>e</i>/<i>h</i>,</nobr> calculated from the fixed numerical values of the elementary charge <i>e</i> and the Planck constant <i>h</i>.</p> <p>Calibrations at <nobr>10 V</nobr> are carried out either by comparison with a Zener working standard that is calibrated with a <nobr>10 V</nobr> array or by direct comparison with an array. Calibrations at <nobr>1.018 V</nobr> are carried out either by comparison with a calibrated standard cell or by direct comparison with an array. The combined standard uncertainty (relative to the nominal output voltage) assigned to the calibration of a <nobr>1.018 V</nobr> or <nobr>10 V</nobr> Zener voltage standard is typically <nobr>1.4 parts</nobr> in 10<sup>8</sup> (excluding uncertainty components associated with transportation). </p> <p>Please send us your calibration request at least four months before the envisaged calibration date. </p> <br> <ul class="txt12pt"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="" border="0"><a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/voltage.doc" class="introGras" target="new">BIPM Zener diode calibration request form</a> <a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/voltage.doc" target="new"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/word.gif" border="0" alt="MS Word"></a> <a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/voltage.pdf" target="new"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pdf.gif" border="0" alt="PDF"></a></ul> <br> <ul class="introGrasGauche"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="">Contact: <a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/ssolve.html" class="introGras">Dr Stéphane Solve</a><br> <br> </div> <div id="resistance"> <p><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/fleche_jaune.gif" width="29" height="14" alt="">In the area of resistance calibrations, the BIPM was the first laboratory to use a cryogenic current comparator for routine resistance calibrations. This provides a significant increase in the precision of the comparisons and makes it possible to obtain, for example, precise estimates for the pressure coefficients of travelling standards received for calibration by measuring variations in resistance caused by natural changes in atmospheric pressure.</p> <p>Routine calibrations are carried out at <nobr>1 <img src="/web/20200528194556im_/https://www.bipm.org/utils/special/14/omega_maj.gif" alt="ohm">,</nobr> <nobr>100 <img src="/web/20200528194556im_/https://www.bipm.org/utils/special/14/omega_maj.gif" alt="ohm"> and <nobr>10 k<img src="/web/20200528194556im_/https://www.bipm.org/utils/special/14/omega_maj.gif" alt="ohm">. With respect to <nobr><i>R</i><sub>K</sub> = <i>h</i>/<i>e</i><sup>2</sup>,</nobr> calculated from the fixed numerical values of the Planck constant <i>h</i> and the elementary charge <i>e</i>,</nobr> the combined standard uncertainty assigned to the calibration of a <nobr>1 <img src="/web/20200528194556im_/https://www.bipm.org/utils/special/14/omega_maj.gif" alt="ohm"></nobr> resistance standard is typically <nobr>1.7 parts</nobr> in 10<sup>8</sup> relative to the nominal value; that assigned to the calibration of a <nobr>100 <img src="/web/20200528194556im_/https://www.bipm.org/utils/special/14/omega_maj.gif" alt="ohm"></nobr> or <nobr>10 k<img src="/web/20200528194556im_/https://www.bipm.org/utils/special/14/omega_maj.gif" alt="ohm"></nobr> resistance standard is typically 1.8 parts in 10<sup>8</sup> (excluding uncertainty components associated with transportation).</p> <p>Please send us your calibration request at least four months before the envisaged calibration date. </p> <br> <p style="color:#FF0000" ;>The resistance calibration service is moving into a new laboratory. Therefore the service is currently suspended until July 2020.</p> <br> <ul class="txt12pt"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="" border="0"><a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/resistance.doc" class="introGras" target="new">BIPM resistance calibration request form</a> <a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/resistance.doc" target="new"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/word.gif" border="0" alt="MS Word"></a> <a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/resistance.pdf" target="new"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pdf.gif" border="0" alt="PDF"></a></ul> <br> <ul class="introGrasGauche"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="">Contact: <a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/brolland.html" class="introGras">Mr Benjamin Rolland</a><br> <br> </div> <div id="capacitance"> <p><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/fleche_jaune.gif" width="29" height="14" alt="">The link between <nobr>1 pF,</nobr> <nobr>10 pF</nobr> and <nobr>100 pF</nobr> capacitance standards and the quantized Hall resistance has been established at the BIPM.</p> <p>With respect to <nobr><i>R</i><sub>K</sub> = <i>h</i>/<i>e</i><sup>2</sup>,</nobr> calculated from the fixed numerical values of the Planck constant <i>h</i> and the elementary charge <i>e</i>,</nobr> the combined relative standard uncertainty assigned to the calibration of a <nobr>1 pF,</nobr> <nobr>10 pF</nobr> or <nobr>100 pF</nobr> capacitance standard is typically <nobr>5 parts</nobr> in 10<sup>8</sup> at <nobr>1000 Hz</nobr> and <nobr>4 parts</nobr> in 10<sup>8</sup> at <nobr>1592 Hz</nobr> (excluding uncertainty components associated with transportation). These uncertainties have been confirmed by several international comparisons. </p> <p>Please send us your calibration request at least four months before the envisaged calibration date. </p> <br> <p style="color:#FF0000" ;>Due to maintenance in the laboratories, the capacitance calibration service will be temporarily suspended from May to October 2020.</p> <br> <ul class="txt12pt"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="" border="0"><a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/capacitance.doc" class="introGras" target="new">BIPM capacitance calibration request form</a> <a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/capacitance.doc" target="new"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/word.gif" border="0" alt="MS Word"></a> <a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/capacitance.pdf" target="new"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pdf.gif" border="0" alt="PDF"></a></ul> <br> <ul class="introGrasGauche"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="">Contact: <a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/angel.moreno.html" class="introGras">Mr Angel Moreno</a><br> <br> </div> </div> </td> </tr> </table> </div> <div id="ionizing-radiation"> <table width="100%" cellpadding="5"> <tr> <td> <table border="0" cellpadding="10"> <tr> <td valign="top"> <p><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/fleche_jaune.gif" width="29" height="14">For those Member State NMIs that do not hold primary standards for x-rays or gamma radiation, the BIPM offers characterizations/calibrations of national secondary standard ionization chambers in terms of the quantities and under the reference conditions determined by the CCRI(I).</p> <p>These are described in <a href="/web/20200528194556/https://www.bipm.org/utils/common/pdf/rapportBIPM/RapportBIPM-2018-06.pdf" class="introGras"><i>Rapport BIPM</i>-2018/06</a>, together with the uncertainty budgets of the relevant BIPM standards.</p> <br> <ul class="introGrasGauche"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/cms_ri.html" class="introGras">Technical description of the services offered</a><br> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="">Contact: <a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/steven.judge.html" class="introGras">Dr Steven Judge</a><br> <br> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a href="/web/20200528194556/https://www.bipm.org/en/scientific/ionizing/certificates.html" class="introGras">List of calibration certificates issued</a> </ul> </td> <td valign="top"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/ri/dosimetry_calibrations_250.jpg" alst="setting up an ionization chamber for calibration"></a> </td> </tr> </table> <div class="txt11ptl">Please note that the BIPM provides these services only to the national laboratories (national measurement institutes or designated institutes) of its <a href="/web/20200528194556/https://www.bipm.org/en/about-us/member-states/" class="intros">Member States</a>, and cannot offer them to private companies.</div> </td> </tr> </table> </div> <div id="mass"> <table width="100%" cellpadding="5"> <tr> <td>  <p>The primary role of the BIPM's activity in Mass is to provide traceability to the kilogram</a>.</p> <p>Calibrations of Pt-Ir prototypes and mass standards in stainless steel are carried out each year during the periods <b>March to May</b> and <b>September to November</b>.</p> <p style="color:#FF0000" ;><b>The BIPM is the pilot laboratory for the first key comparison of kg realizations, CCM.M-K8.2019. Therefore the mass calibration service will be temporarily suspended during the first half of 2020.</b></p> <br> <script> $(function() { $("#accordion2").accordion({ heightStyle: "content", }); }); </script> <div id="accordion2"> <h3>1 kg prototypes in Pt-Ir</h3> <div> <ul> <p>The BIPM offers a calibration service for 1 kg national prototypes in Pt-Ir. This service is available free of charge to Member States. The Physical Metrology Department maintains a number of prototypes and other standards in Pt-Ir. A subset of these are used as working standards to calibrate national prototypes upon request. The remainder are used for quality control. Since <nobr>20 May 2019</nobr> the kilogram is defined with respect to the fixed numerical value of the Planck constant. Before the completion of the first key comparison of realization experiments, the traceability will be based on the known relationship between the mass of the International Prototype of the Kilogram (IPK) and the Planck constant. The combined standard uncertainty is about <nobr>0.012 mg.</nobr> This uncertainty is dominated by the standard uncertainty of <nobr>0.010 mg</nobr> of the mass of the IPK with respect to the Planck constant. The standard uncertainty of the prototype under calibration with respect to the IPK is about <nobr>0.005 mg.</nobr></p> <p>The BIPM also fabricates Pt-Ir prototypes for Member States upon request.</p> <li> <a href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/calib_proto.pdf" class="introGras">Request the calibration of a national prototype <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pdf.gif" border="0"></a></li> <br> </ul> </div> <h3>1 kg mass standards in stainless steel</h3> <div> <ul> <p>The BIPM offers a calibration service for <nobr>1 kg</nobr> standards in stainless steel. This service is available free of charge to NMIs of Member States. The volume of the standard can be determined by <a href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/Density_of_standards.pdf" class="introgras">hydrostatic weighing</a> at the BIPM if this parameter is unknown (typical combined standard uncertainty obtained at the BIPM is <nobr>0.44 mm<sup>3</sup></nobr> at the reference temperature of <nobr>20.0 °C).</nobr> However, the volumetric thermal expansion near room temperature must be supplied by the NMI or the manufacturer of the standard. Since <nobr>20 May 2019</nobr> the kilogram is defined with respect to the fixed numerical value of the Planck constant. Before the completion of the first key comparison of realization experiments, the traceability will be based on the known relationship between the mass of the International Prototype of the Kilogram (IPK) and the Planck constant. The combined standard uncertainty is about <nobr>0.012 mg.</nobr> This uncertainty is dominated by the standard uncertainty of <nobr>0.010 mg</nobr> of the mass of the IPK with respect to the Planck constant. The standard uncertainty of the stainless steel standard under calibration with respect to the IPK is about <nobr>0.006 mg.</nobr> </p> <li><a href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/calib_inox.pdf" class="introGras"> Request the calibration of a 1 kg standard in stainless steel <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pdf.gif" border="0"></a></li> <br> </ul> </div> </div> </td> </tr> </table> <ul><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="" border="0"><a href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/calib_proto.pdf" class="introgras" target="new">Request the calibration of a national prototype</a> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pdf.gif" border="0" alt="PDF"></a><br> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt="" border="0"><a href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/calib_inox.pdf" class="introgras" target="new">Request the calibration of a 1 kg standard in stainless steel</a> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pdf.gif" border="0" alt="PDF"></a></ul> </div> </div>  </div> </td> <td width="10"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="10"></td> <td width="180"> <table width="180" border="0" cellspacing="0" cellpadding="4" bgcolor="#3B568D"> <tr> <td width="100%" height="100%" valign="top"> <table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#FFFFFF"> <tr> <td width="180" height="100%" valign="top"> <table width="180" border="0" cellpadding="3" bgcolor="#FFFFFF" cellspacing="0" height="100%"> <tr align="left" valign="middle" bgcolor="#00498F"> <td height="25" valign="top" bgcolor="#3B568D" class="cadreTrt"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> Traceability to the SI through the BIPM</td> </tr> <tr> <td height="100%" valign="top" class="txtBleu8pt" align="left"> <table width="100%"> <tr> <td>Subject area:</td> </tr> <tr> <td> <form name="cms_section" method="GET"> <select name="section_value" onchange="javascript:window.location.href=this.options[this.selectedIndex].value"> <option value=""></option> <option value="/en/bipm-services/calibrations/cms_qm.html">Chemistry</option> <option value="/en/bipm-services/calibrations/cms_em.html">Electricity</option> <option value="/en/bipm-services/calibrations/cms_ri.html">Ionizing radiation</option> <option value="/en/bipm-services/calibrations/cms_m.html">Mass</option> </select> </form> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/traceability.html" class="introGras">What is traceability?</a><br> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/uncertainty.html" class="introGras">BIPM policy on stating uncertainties</a> </td> </tr> </table> </td> </tr> </table></td> </tr> </table></td> </tr> </table> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="100%" height="5"> <table width="180" border="0" cellspacing="0" cellpadding="4" bgcolor="#829EBA"> <tr> <td width="100%" height="100%" valign="top"> <table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#FFFFFF"> <tr> <td width="180" height="100%" valign="top"> <table width="180" border="0" cellpadding="3" bgcolor="#FFFFFF" cellspacing="0" height="100%"> <tr align="left" valign="middle" bgcolor="#00498F"> <td height="25" valign="top" bgcolor="#829EBA" class="cadreTrt"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> Summary charts: Technical services per Member State</td> </tr> <tr> <td height="100%" valign="top" class="txtBleu8pt" align="left"> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a class="introGras" href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/BIPM-services-chemistry.pdf">Chemistry<img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/chart4.gif" border="0"></a><br> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a class="introGras" href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/BIPM-services-electricity.pdf">Electricity<img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/chart4.gif" border="0"></a><br> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a class="introGras" href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/BIPM-services-ionizing-radiation.pdf">Ionizing Radiation<img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/chart4.gif" border="0"></a><br> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a class="introGras" href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/BIPM-services-mass.pdf">Mass<img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/chart4.gif" border="0"></a><br> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a class="introGras" href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/BIPM-services-time.pdf">Time<img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/chart4.gif" border="0"></a><br> </td> </tr> </table> </td> </tr> </table> </td> </tr> </table> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="100%" height="5"> <table width="180" border="0" cellspacing="0" cellpadding="4" bgcolor="#829EBA"> <tr> <td width="100%" height="100%" valign="top"> <table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#FFFFFF"> <tr> <td width="180" height="100%" valign="top"> <table width="180" border="0" cellpadding="3" bgcolor="#FFFFFF" cellspacing="0" height="100%"> <tr align="left" valign="middle" bgcolor="#00498F"> <td height="25" valign="top" bgcolor="#829EBA" class="cadreTrt"> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""> Related articles: </td> </tr> <tr> <td height="100%" valign="top" class="txt11ptl" align="left"> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a class="introGras" href="/web/20200528194556/https://www.bipm.org/en/bipm-services/comparisons/">Comparisons piloted by the BIPM</a><br/> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a class="introGras" href="/web/20200528194556/https://www.bipm.org/en/bipm/">BIPM work programme</a><br/> <img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/bullet1.gif" width="16" height="9" alt=""><a class="introGras" href="/web/20200528194556/https://www.bipm.org/en/worldwide-metrology/bipm-oiml-ilac-iso_joint_declaration.html">Joint BIPM, OIML, ILAC and ISO declaration on metrological traceability</a><br/> </td> </tr> </table> </td> </tr> </table> </td> </tr> </table> </td> </tr> <tr> <td height="5" colspan="5"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="5"></td> </tr> </table>   <table width="100%" bgcolor="#D3B657"> <tr> <td width="15%"></td> <td width="1000"> <table width="1000" border="0" cellspacing="0" cellpadding="0"> <tr> <td nowrap width="100%"> <style media="all" type="text/css"></style> <div class="menu3"> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/en/worldwide-metrology/" target="_self">Metrology area:</a></li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/auv/" target="_self">AUV</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/auv/" target="_self">Metrology in the field of Acoustics, Ultrasound and Vibration</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccauv/" target="_self">Committee structure (CCAUV)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/auv/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/si-brochure/" target="_self">Units (SI Brochure)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/gpanfilo.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/electricity-magnetism/" target="_self">EM</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/electricity-magnetism/" target="_self">Metrology in the field of Electricity and Magnetism</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccem/" target="_self">Committee structure (CCEM)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/electricity-magnetism/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/electricity-magnetism/units.html" target="_self">Units for electrical quantities</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/electricity/" target="_self">BIPM laboratory work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/comparisons/#PM" target="_self">Ongoing BIPM comparisons</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/#electricity" target="_self">BIPM calibrations of electrical standards</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/electricity-magnetism/publications.html" target="_self">BIPM publications in the scientific literature</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/mstock.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/length/" target="_self">L</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/length/" target="_self">Length Metrology</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccl/" target="_self">Committee structure (CCL)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/length/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/length/units.html" target="_self">Unit of length (metre)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/mises-en-pratique/standard-frequencies.html" target="_self">Recommended values of standard frequencies</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/gpanfilo.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/mass/" target="_self">M</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/mass/" target="_self">Mass Metrology</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccm/" target="_self">Committee structure (CCM)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/mass/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/mass/units.html" target="_self">Unit of mass (kilogram)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/mass/" target="_self">BIPM laboratory work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/mass/calibrations_mass/" target="_self">Calibration services</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/mass/publications.html" target="_self">BIPM publications in the scientific literature</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/mass/contact.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/photometry-radiometry/" target="_self">PR</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/photometry-radiometry/" target="_self">Metrology in the field of Photometry and Radiometry</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccpr/" target="_self">Committee structure (CCPR)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/utils/en/pdf/CCPR-strategy-document.pdf" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/photometry-radiometry/units.html" target="_self">Photometric units</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/photometry-radiometry/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/jviallon.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/chemistry-biology/" target="_self">QM</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/chemistry-biology/" target="_self">Metrology in the field of Chemistry and Biology</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccqm/" target="_self">Committee structure (CCQM)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/chemistry-biology/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/chemistry-biology/units.html" target="_self">Unit for amount of substance (mole)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/chemistry/" target="_self">BIPM laboratory work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/comparisons/#QM" target="_self">Comparisons piloted by the BIPM</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/#chemistry" target="_self">BIPM calibrations: National ozone standards</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/chemistry-biology/publications.html" target="_self">BIPM publications in the scientific literature</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/chemistry-biology/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/rwielgosz.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/ionizing-radiation/" target="_self">RI</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/ionizing-radiation/" target="_self">Metrology in the field of Ionizing Radiation</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccri/" target="_self">Committee structure (CCRI)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/ionizing-radiation/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/ionizing-radiation/units.html" target="_self">SI units</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/ionizing/radionuclides/sir/" target="_self">International Reference System (SIR)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/ionizing/" target="_self">BIPM laboratory work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/comparisons/#RI" target="_self">Ongoing BIPM comparisons</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/calibrations/#ionizing-radiation" target="_self">BIPM calibrations: Ionization chambers</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/ionizing-radiation/publications.html" target="_self">BIPM publications in the scientific literature</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/scientific-output/monographies-ri.html" target="_self"><i>Monographies</i> BIPM</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/ionizing-radiation/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/steven.judge.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/thermometry/" target="_self">T</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/thermometry/" target="_self">Metrology in Thermometry</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/cct/" target="_self">Committee structure (CCT)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/thermometry/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/thermometry/units.html" target="_self">SI base unit (kelvin)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/susanne.picard.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/metrology/time-frequency/" target="_self">TF</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/time-frequency/" target="_self">Time and Frequency Metrology</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/cctf/" target="_self">Committee structure (CCTF)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/time-frequency/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/timescales/time-server.html" target="_self">What time is it?</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/timescales/" target="_self">Timescales</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/time-frequency/units.html" target="_self">Unit of time (second)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/mises-en-pratique/standard-frequencies.html" target="_self">Recommended values of standard frequencies</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/tai/" target="_self">BIPM technical work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/jsp/en/TimeCalibrations.jsp" target="_self">BIPM calibrations for time transfer</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/time-frequency/publications.html" target="_self">BIPM technical publications</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/tai/annual-report.html" target="_self">BIPM Annual Report on Time Activities</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm-services/timescales/time-ftp.html" target="_self">FTP server of the BIPM Time Department</a></li> <li><a href="https://web.archive.org/web/20200528194556/http://webtai.bipm.org/database/html/" target="_self">Time Department Database</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/time-frequency/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/patrizia.tavella.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528194556/https://www.bipm.org/en/measurement-units/" target="_self">U</a> <ul> <li><a href="/web/20200528194556/https://www.bipm.org/en/measurement-units/" target="_self">Measurement units: the International System (SI)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/publications/si-brochure/" target="_self">SI Brochure</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/measurement-units/#si-base-units" target="_self">SI base units</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/measurement-units/#prefixes" target="_self">SI prefixes</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/committees/cc/ccu/" target="_self">Consultative Committee for Units (CCU)</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/metrology/units/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="https://web.archive.org/web/20200528194556/http://physics.nist.gov/cuu/Constants/index.html" target="new">CODATA recommended values of the Fundamental Physical Constants</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/extra/codata-tgfc/" target="_self">CODATA Task Group on Fundamental Constants</a></li> <li><a href="/web/20200528194556/https://www.bipm.org/en/bipm/people/estefania.de.mirandes.html" target="_self">BIPM contact</a></li> </ul> </li> </ul> </div> </td> </tr> </table> </td> <td width="15%"></td> </tr> </table>   <table width="100%" bgcolor="#193B7F" alt="mid blue"><tr><td> <center> <table width="1000" bgcolor="#193B7F" border="0" cellspacing="0" cellpadding="0"> <tr height="60"> <td width="20"><img src="/web/20200528194556im_/https://www.bipm.org/utils/common/img/pix.gif" width="20" height="60" alt=""></td> <td 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