Conditions under which test results are obtained by one or more operators in a single site location practicing the same test method on a single measurement system which may comprise multiple instruments, using test specimens taken at random from the same sample of material, over an extended period of time spanning at least a 15-day interval.
- Note: Site precision conditions should include all sources of variation that are typically encountered during normal, long term operation of the measurement system. Thus, all operators who are involved in the routine use of the measurement system should contribute results to the site precision determination.
- Note: If multiple results are obtained within a 24 hour period, then it is recommended that the number of results used in site precision calculations be increased to capture the longer-term variation in the system.