Recommended Practices Publications
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Picture of the productRP-1: Establishment and Adjustment of Calibration Intervals
This Recommended Practice (RP) is intended to provide a guide for the establishment and adjustment of calibration intervals for equipment subject to periodic calibration. It provides information needed to design, implement and manage calibration interval determination, adjustment and evaluation programs. Both management and technical information are presented in this RP. Several methods of calibration interval analysis and adjustment are presented. The advantages and disadvantages of each method are described and guidelines are given to assist in selecting the best method for a requiring organization.

The technical information is intended primarily for use by technically trained personnel assigned the responsibility of designing and developing a calibration interval-analysis system. Because the subject of calibration interval analysis is not commonly treated in generally available technical publications, much of the methodology is presented herein. Where feasible, this methodology is given in the body of the RP, with advanced mathematical and statistical methods deferred to the Appendices. Statistical or other methods that are not described in detail are referenced.
Revision Year 2010


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RP_01
Picture of the productRP-3: Calibration Procedures Requirements (2007)
This document provides technical guidelines for Calibration Procedures (CP) as far as contents needed and format preferred for Measuring and Test Equipment (M&TE), general Measurement/Test Systems (M/TS), and Measurement Standards (MS). This RP is directed to the M&TE and MS manufacturer since their work typically is the reference for all that follows. The general test information philosophy and practice of this RP is applicable to any performance verification test action and documentation for product or other test function activities. This RP is intended to provide enough information to achieve basic standardization in the measurement community through simplification of the M&TE or MS user analysis process and reduction of the duplication of effort in writing, re-writing, and revising CP's by multiple organizations.
Revision Year 2007


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RP_03F
Picture of the productRP-5: Measuring and Test Equipment Specifications (2016)
This New Recommended Practices Document is Now Available
MTE specifications should include performance characteristics that can be used to evaluate the suitability of MTE for a given application. However, understanding specifications and using them to compare equipment from different suppliers or vendors can be a perplexing task. This primarily results from inconsistent terminology, units and methods used to develop and report equipment specifications.

MTE specifications are used to compute test uncertainty ratios and estimate bias uncertainties essential for measurement uncertainty analysis and decision risk analysis. In addition, MTE are periodically calibrated to determine if they are performing within specified tolerance limits. Therefore, it is important that MTE specifications are properly reported, interpreted and applied.

This document is intended to provide recommended practices for developing, reporting, obtaining, interpreting, validating and applying MTE specifications. Detailed examples are included to educate, demonstrate, promote and reinforce best practices.


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RP_05F
Picture of the productRP-6: Calib. Quality Systems for the Healthcare Ind. (2015)
NCSL International Recommended Practice 6 is intended to provide general guidance that can be used by healthcare industry organizations to establish an effective calibration quality system. This recommended practice is intended for use by any healthcare industry organization that engages in the calibration of M&TE. This document can be used to develop calibration quality systems for healthcare industry organizations in order to ensure that M&TE are adequately calibrated to meet regulatory and quality requirements. The healthcare industry is committed to providing products and services of the highest possible quality and integrity to the world healthcare market. Thus, a calibration quality system should be established. The original Recommended Practice was developed by the Biomedical and Pharmaceutical Metrology Committee of the NCSL International (NCSLI). This latest revision by the Healthcare Metrology Committee reflects current international standards and regulatory requirements.
Revision Year 2015


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RP_06F
Picture of the productRP-7: Laboratory Design (2000)
The intent of this document is to provide a useful guide for the site selection and design of a new metrology laboratory or for the modification of an existing facility. It contains materials and information as an industry aid and guide for specifying design requirements to architects, drafters and builders by the user. It references numerous international publications on laboratory design.
Revision Year 2000


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RP_07F
Picture of the productRP-8: An Individual Equipment Evaluation Guide (1988)
The purpose of this document is to provide an objective rating system to use in the evaluation of General Purpose Measurement and Test Equipment (GPM&TE). The procedure is designed so evaluations performed on different equipment by various groups within an organization or company may be compared for selection purposes.
Revision Year 1988


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RP_08F
Picture of the productRP-9: Laboratory Capability Documentation Guideline (2014)
This Recommended Practice (RP) has been prepared to facilitate the uniform description of measurement capabilities offered by test and calibration laboratories, inspection bodies (IBs), and proficiency testing providers (PTPs). The RP includes practical information and guidance to develop, validate, maintain, and publish measurement capability descriptions suitable for use by test and calibration service providers and specifiers, as well as assessment, accreditation, and other authoritative bodies.
Revision Year 2014


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RP_09F
Picture of the productRP-10: Establishment and Ops. of an Elec. Utilities (2004)
This Recommended Practice is intended for use by an organization providing services to US nuclear utilities by calibrating and verifying a particular utility’s measurement and test equipment (M&TE) and related materials, and/or in the administration of the utility’s M&TE program.
Revision Year 2004


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Picture of the productRP-12: Determining and Rpt. Measurement Uncertainties (2013)
This recommended practice for implementing the methods of the GUM and applying uncertainty analysis methodologies established since the GUM's publication. In addition to methods for estimating uncertainty, the RP includes detailed uncertainty analysis procedures, the evaluation and application of uncertainty estimates and real-world uncertainty analysis examples.

The 2013 RP-12 edition was developed by the NCSLI 173.5 Uncertainty Analysis Committee to provide a recommended practice for estimating and reporting measurement uncertainty that clearly explains key concepts and methods and that builds a comprehensive framework for developing relevant, informative and useful uncertainty estimates.
Revision Year 2013


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RP_12F
Picture of the productRP-13: Computer Systems in Metrology (1996)
This document presents an outline of the software program elements and guidelines that may be used to improve the quality, reliability and usability of Metrology Computer Systems. The guidelines presented are applicable to all commercially acquired and in-house developed computer systems and automated equipment used for the capture, processing, manipulation, recording, reporting, storage, or retrieval of calibration or test data, and that are depended upon to implement requirements of the Metrology Quality Program.
Revision Year 1996


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Picture of the productRP-14: Guide to Selecting Standards Lab Env. (2005)
The purpose of this document is to provide guidance in the selection of laboratory environments suitable for standards maintenance and calibration operations. It is intended not to mandate a specific environment for a specific calibration, but to direct selection of the environment and to offer some suggestions on how to extend precision in an existing or achievable (practical) environment. Although this document pertains specifically to standards laboratories, it can be applied to any laboratory requiring environmental control.
Revision Year 2005


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RP_14F
Picture of the productRP-15: Interlaboratory Comparisons (2008)
The information presented in this RP addresses primarily the conducting of interlaboratory comparisons (ILCs) for various metrology disciplines. Use of the guidance, structure, and procedures herein is voluntary. However, much of the information in this RP is also applicable to a wide range of ILCs for other disciplines, including chemical and medical. This RP may also serve as a basic guide for proficiency testing (PT), which is used as part of the overall process of accrediting a calibration or testing laboratory. For more information regarding proficiency testing, refer to ISO/IEC 17043:2010 ("Conformity assessment - General requirements for proficiency testing"), as well as ILAC-G13:08/2007 ("Guidelines for the Requirements for the Competence of Providers of Proficiency Testing Schemes").
Revision Year 2008


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RP_15F
Picture of the productRP-16: Verification of Laboratory Environments (2007)
This Recommended Practice provides guidance on the acceptance testing of a new laboratory facility and the regular calibration of the laboratory facility to ensure that it meets the design and operational conditions established for the measurements. Guidance is provided for testing Temperature, Relative Humidity, Static Air Pressure, Particulates, Sound Intensity Levels, Lighting Levels, Electrostatic Dissipative (ESD) Flooring, Measuring the Shielding Effectiveness of Shielded Enclosures, and Site Vibration.
Revision Year 2007


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Picture of the productRP-17: Document Metrology Education, Training, OJT (2007)
This recommended practice provides a method by which metrology education, training, and on-the-job training (OJT) can be documented in the metrology laboratory. The methods are designed to ensure that various aspects of training can be used to ensure compliance to the requirements of ISO/IEC 17025 and national and international standards, and to facilitate universal acceptance of metrology education, training, and on-the-job training (OJT) records by future employers. This Recommended Practice was initiated by the Personnel Training and Qualifications Committee, coordinated by the cognizant Vice President and approved for publication by the NCSL International Board of Directors on August 4, 2007. This recommended practice focuses on documenting metrology education, training, and on-the-job training (OJT). The extent of education and training required of technical personnel depends on many factors, including the size and measurement requirements of the laboratory. Training is often obtained through a combination of formal training courses and OJT.
Revision Year 2007


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RP_17F
Picture of the productRP-18: Estimation and Eval. of Measurement Dec. Risk (2014)
The general objective of this publication is to assist activities in which decisions are based on Measurement results, in particular, those that relate to meeting quality and performance requirements. The specific objective is to provide guidelines for computing metrics by which conformance testing for Test and calibration processes can be evaluated. Chief among these metrics is measurement decision risk (MDR). MDR includes;
(1) the risk of an equipment attribute being out-of-tolerance and incorrectly accepted as intolerance
(2) the risk of an attribute being in-tolerance and rejected as being out-of-tolerance.
The former is called False Accept Risk (FAR) and the latter is termed False Reject Risk (FRR). A principal objective of this RP is to accumulate and focus the current body of knowledge on measurement decision risk analysis to estimate and manage such FAR and FRR, particularly as they relate to tests and calibrations.
In addition to providing guidelines for estimating and managing MDR, this Recommended Practice (RP) addresses the evaluation of these risks in terms of their impact on both operating costs and on the cost of the undesirable consequences of incorrect test decisions. The guidelines provided herein can also be applied to equipment and system design issues involving decisions regarding accuracy requirements and available support capabilities.
Revision Year 2014


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RP_18F
Picture of the productRP-20: Laboratory Workforce Planning (2010)
This Recommended Practice provides an overview of key workforce development concepts from both human resources (HR) and laboratory top management perspectives. It illustrates methods for practical application for the metrology laboratory and for the larger organization of which the laboratory might be a part. The objective of this publication is to bridge the gap between traditional human resource organizational requirements and the requirements of metrology laboratories complying with ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories. This document also integrates practical approaches to complying with ISO/IEC 17025 requirements to ensure that a laboratory has adequate managerial and technical personnel that are both trained and competent and that the metrology laboratory's training plans consider current and anticipated workload as well as changes in workforce mix.
Revsion Year 2010


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RP_20F
Picture of the productRP-21: The Assessment of Z540.3 Sub-clause 5.3 (2012)
The National Standard, ANSI/NCSL Z540.3-2006, Requirements for the Calibration of Measuring and Test Equipment, prescribes the requirements for a calibration system to control the accuracy of the measuring and test equipment used to ensure that products and services comply with prescribed requirements. Included are the requirements for calibration of the measuring and test equipment by a calibration-servicing component of that system. This component is commonly referred to as a standards or calibration laboratory, calibration service center, etc. ANSI/NCSL Z540.3-2006 is commonly referred to in Recommended Practice-21 (RP-21) as the Standard or simply Z540.3.
It is noted in sub-clause 5.3 of the Standard that "Calibration-servicing components [of the calibration system] may be considered competent to provide calibration services when they have been accredited to meet ANS/ISO/IEC 17025:2005, including the requirements of this sub-clause, [5.3], or otherwise found to be in conformance by an authority acceptable to the customer." ANS/ISO/IEC 17025:2005 is commonly referred to in RP-21 as 17025.
Accordingly, RP-21 has been prepared to facilitate uniform assessment of calibration-servicing components (CSC), such as standards and calibration laboratories, calibration servicing centers, etc., seeking to be found in compliance with the requirements of sub-clause 5.3 of the Standard by an authoritative body. This assessment augments accreditation to ISO/IEC 17025:2005 as provided for in sub-clause 5.3 of the Standard
Revision Year 2012


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