What is ISO 22514‑7 about?
ISO 22514‑7 is the seventh part of statistical methods in process management multi-series. ISO 22514‑7 defines a procedure to validate measuring systems and a measurement process to state whether a given measurement process can satisfy the requirements for a specific measurement task with a recommendation of acceptance criteria. The acceptance criteria are defined as a capability figure (CMS, CMP) or a capability ratio (QMS, QMP).
ISO 22514‑7 is primarily developed to be used for simple one-dimensional measurement processes, where it is known that the method uncertainty and the specification uncertainty are small compared to the implementation uncertainty.
Note1: ISO 22514‑7 can also be used in similar cases, where measurements are used to estimate process capability or process performance. It is not suitable for complex geometrical measurement processes, such as surface texture and position measurements that rely on several measurement points or simultaneous measurements in several directions.
Note2: ISO 22514‑7 follows the approach taken in ISO/IEC Guide 98-3 (GUM), and establishes a basic, simplified procedure for stating and combining uncertainty components used to estimate a capability index for an actual measurement process.
Who is ISO 22514‑7 for?
ISO 22514‑7 on the capability of measurement processes is useful for:
- Project managers
- Quality control personnel
Why should you use ISO 22514‑7?
The quality of measurement results is given by the uncertainty of the measurement process. This is defined by the statistical properties of multiple measurements, or estimates of properties, based on the knowledge of the measurement process.
The methods specified in ISO 22514‑7 address the implementation uncertainty. ISO 22514‑7 specifies methods to define and calculate capability indices for measurement processes based on estimated uncertainties.
ISO 22514‑7 helps you to identify processes that meet the project’s specifications.
What’s changed since the last update?
BS ISO 22514‑7:2021 supersedes BS ISO 22514‑7:2012. BS ISO 22514‑7:2021 includes some technical changes concerning BS ISO 22514‑7:2012. These include:
- Use of the MPE values in the calculations
- Revision of the calculation of the linearity, with amendments in the example in Clause A.1
- Addition of a method to calculate the capability when the specifications of the characteristic of interest are defined as a one-sided specification (new 9.3)