Z540 Calibration Lab Compliance
What is Z540 Calibration?
A Z540 calibration is performed in a lab that is compliant with the specific equipment and process requirements of the ANSI/NCSL Z540.3 U.S. national technical requirement standard for calibration labs.
In order to achieve accreditation, labs must demonstrate compliance with ANSI/NCSL Z540.3 requirements regarding measurement and test equipment, accuracy, and service performance. Guidelines are also provided for aspects of calibration such as:
- Measurement uncertainty
- Document control
- Service intervals
Operating in full compliance with the standard allows labs to better control calibration risks.
The term ANSI Z540 or NCSL Z540 may be used in reference to either ANSI/NCSL Z540-1 or ANSI/NCSL Z540.3. The Z540-1 calibration standard was the original version from 1994. Though withdrawn as an active standard in 2007, Z540-1 calibrations continue to be offered by labs for customers who have this type of servicing need.
ANSI Z540 and the PFA
Requirements of the Z540.3 standard cover the probability of false acceptance (PFA), which is the probability that a lab’s measurement could incorrectly find an instrument in tolerance (despite being out of tolerance.) A Z540.3 accredited calibration lab must maintain a PFA of less than 2%.
Z540 requires traceability of instruments used to perform calibrations to national standards, international standards, or intrinsic standards, with traceability stated on calibration certificates. It does not require traceability to SI Standards.
Transcat Calibrations to Z540 Standards
For more than 50 years, we have dedicated ourselves to the science of accuracy and risk mitigation. Transcat’s calibration laboratories are accredited to ISO/IEC 17025, ANSI/NCSL Z540-1, and ANSI/NCSL Z540.3. Each of our labs are required to undergo regular audits to ensure compliance with the associated standards. We strive to provide the best service options to meet both national and international standards.
Learn how our accredited labs can meet your calibration requirements.
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