The National Measurement Institute (NMI) assess your submitted pattern to ensure it can pass certain requirements and performance tests.
Find out how to apply for pattern approval.
We carry out an initial assessment to see if we have all the relevant information and a suitable instrument to assess.
We usually need you to send the instrument to us but can visit you on site to inspect large instruments. We will provide details of how to send in your instrument after you apply.
Once we conduct the preliminary assessment, we provide an outline of the testing needed and a cost estimate, if required.
You will need to:
Once we receive the requested extra information and you have made any modifications to the equipment, we can conduct a full assessment of your pattern.
When we examine instruments for pattern approval, we assess:
Performance testing ensures your instrument:
We base our performance tests on the specifications detailed in the pattern approval requirements.
We will contact you with the results of each test after we perform them.
We accept test results from other ISO 17025 accredited facilities with appropriate scope of accreditation. We generally do not accept manufacturer’s test results.
To help us to determine acceptability, you can provide:
We have mutual acceptance agreements with:
We may appoint approving authorities to test measuring instruments.
Find an approving authority to test your measuring instrument for pattern approval.
After we have assessed your instrument pattern and documentation, we make a decision. If we approve your instrument, then we issue a certificate of approval.
We will notify you if we assess your instrument pattern and make the decision not to pass it. You will be able to make modifications and resubmit your instrument.
Last updated: 8 December 2020
Content ID: 54011