Conduct of the tests:
Time intervals and procedure to be defined by the manufacturer
Influenced by the type of facility and level of protection
See also ISO 14644 for methods of testing
Requalification, and change control
8.2.18 The maximum time interval between tests should be defined by the manufacturer. The type of facility under test and the product level of protection should be considered.
Note: Table 3 gives intervals for reference purposes only. The actual test periods may be more frequent or less frequent, depending on the product and process.
8.2.19 Periodic requalification of parameters should be done at regular intervals, e.g. annually.
8.2.20 Requalification should also be done when any change, which could affect system performance, takes place.