Links to NVLAP DocumentsNIST Handbook 150:2006, NVLAP Procedures and General RequirementsNIST Handbook 150 Checklist (Word version)NVLAP General Application FormCalibration Program Application FormNIST HB 150-2 Supplemental Checklist - Z540-1-1994, Part I (Word)NIST HB 150-2 Supplemental Checklist - ILAC-P14:12/2010 (Word)
Calibration Scope Changes
NVLAP continues to make improvements to its scopes of accreditation. These changes have occurred recently or will occur upon renewal. Click here for a complete explanation of NVLAP's calibration scope and NVLAP code modifications.
Proficiency Testing Requirements
Due to changes in ILAC-P9, ILAC Policy for Participation in Proficiency Testing Activities, NVLAP began to collect proficiency test plans starting with April 2012 renewals. The content of this plan was not defined at that time. NVLAP is pending release of a new calibration requirements document that will provide detail. The term schedule may be more applicable as we really need to know what you have done recently and what you are planning to do. We have also created a plan and schedule for NVLAP-Coordinated PTs; please see the link below to review this document. In the future, a periodic review of this will be required as part of maintaining your calibration laboratory accreditation. Future activity on this page will be:
To view and download the projected schedule of NVLAP-Coordinated Proficiency Testing, please click here.
This site has been established for present laboratories and applicants of the accreditation program for calibration laboratories. On this site you will find important program information and links to documents required for successful participation in the program.
The Calibration Laboratories Accreditation Program (LAP) was developed by the National Voluntary Laboratory Accreditation Program (NVLAP) at the National Institute of Standards and Technology (NIST) as a result of interest from private industry and at the request of the National Conference of Standards Laboratories (now the NCSL International). The goal of the program is to provide a means by which calibration laboratories can be assessed for competency. This voluntary program is not designed to serve as a means of imposing specific calibration procedures or minimum uncertainties on applicant laboratories; instead, the program allows for all scientifically valid calibration schemes and requires that laboratories derive and document their measurement uncertainties.
The program has 8 major fields of metrology with over 90 individual parameters. Laboratories' uncertainties range from working level to values equivalent to NIST. Our assessor base includes world renowned NIST experts in the various parameters and experts from industry. The program insures laboratories are assessed by personnel experienced in the specific parameter at, or in most cases above, the level at which the laboratories are operating.
Frequently Asked Questions (FAQs)
Q: How much does it cost?
A: The current application and annual administrative support fee may be found in our fee schedule. The assessment fee varies with breadth of requested scope and is obtained from a calibration program manager prior to application. Proficiency testing is highly dependent on parameter/uncertainty combinations and needs to be evaluated on a case by case basis. For laboratories in the continental United States*, NVLAP projects and invoices a fixed cost for application, administrative, and assessment. There are no surprises with added costs. There are no fees for requesting changes to scope that do not require another assessment and no added assessment fees for evaluation of your responses.
* Laboratories outside of this area are charged actual costs, which may exceed those based solely on the scope due to additional travel.
A piston gauge generates a known pressure from calibrated masses applying force onto a piston within a cylinder. The area of the piston is known either from dimensional measurements or through comparison to the pressure generated from another piston gauge.
References & InformationInternational Laboratory Accreditation Cooperation (ILAC)ILAC Procedural DocumentsILAC Guidance DocumentsNational Conference of Standards Laboratories (NCSLI)NCSLI Recommended Practices (RPs)NCSLI Laboratory Management (LMs)National Institute of Standards and Technology (NIST)NIST TN 1297 - Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement ResultsNIST SP 330 - The International System of Units (SI)NIST SP 811 - Guide for the Use of the International System of Units (SI)NISTIR 6969 - GLP 9, Good Laboratory Practice for Rounding Expanded Uncertainties and Calibration ValuesInternational Bureau of Weights and Measures (BIPM)BIPM PublicationsBIPM Key Comparison Database (KCDB)
Related LinksNVLAP Directory of Accredited Laboratories
All state labs, federal labs M-Z, and commercial labs U-Z, contact:
Federal labs A-L and commercial labs A-L, contact:
Commercial labs M-T, contact:
Any contact can assist you in case of absence.