Requirements for calibration certificates issued by CLAS laboratories


CLAS requirements document 6, May 2018

1.0 Introduction

  • 1.1 This document provides detailed requirements for calibration certificates issued by calibration laboratories under the Standards Council of Canada (SCC) Accreditation Program, and certified by the Calibration Laboratory Assessment Service (CLAS) of the National Research Council of Canada (NRC).
    note: These certificates are sometimes called calibration reports. For purposes of this document, the word "certificate" will include both.
  • 1.2 General requirements for calibration certificates are given in ISO/IEC 17025, General Requirements for the Competence of Testing and Calibration Laboratories.
  • 1.3 The details set out below are mandatory for all calibration certificates issued by a laboratory for the calibrations for which it holds CLAS certification and SCC accreditation.

2.0 Content

  • In addition to the requirements in ISO/IEC 17025 each certificate must contain the following information. For consistency, it is recommended that the wording shown below in italics be used.
    • 2.1 The calibration certificate shall meet all the requirements of ILAC-P14.
    • 2.2 The CLAS certification number. The use of the CLAS logo is optional. The electronic file for the CLAS logo and the CLAS Trademark License Agreement are available through CLAS on request.
    • 2.3 The SCC accreditation number. The use of the SCC logo is optional. The electronic file for the SCC logo and a trademark license agreement are available through SCC on request.
    • 2.4 The traceability statement and a declaration of certification and accreditation:
      The Calibration Laboratory Assessment Service (CLAS) of the National Research Council of Canada (NRC) has assessed and certified specific calibration capabilities of this laboratory and traceability to the International System of Units (SI) or to standards acceptable to the CLAS program. This certificate of calibration is issued in accordance with the conditions of certification granted by CLAS and the conditions of accreditation granted by the Standards Council of Canada (SCC). Neither CLAS nor SCC guarantee the accuracy of individual calibrations by accredited laboratories.
    • 2.5 Since the result of a calibration is valid only at the time of execution, the predicted long-term behaviour of the measured device is generally not taken into account. At the client's request, an additional allowance for the possible effects of transportation, long-term stability or intended use may be included. If this is done, it must be included in the certificate with adequate details.
    • 2.6 Except as permitted by 2.7, calibration certificates which are issued for services outside their scope of CLAS certification shall not contain any reference to CLAS certification or SCC accreditation, nor shall they refer to the fact that the issuing laboratory has CLAS certification or SCC accreditation.
    • 2.7 A calibration laboratory certified by CLAS and accredited by SCC may be permitted to report measured values outside the scope of its accreditation. However, such occurrences must be clearly identified on the calibration certificate as being outside the scope of accreditation, and shall form only a small portion of the reported results.
    • 2.8 Functional tests or checks that are supplementary to the calibration may also be reported under suitable headings to distinguish them from the CLAS-certified measurements.