Schedule
Verification/calibration of the test apparatus is a mandatory part of this International standard. However, the frequency of calibration and the procedures used are, unless otherwise stated, at the discretion of the individual laboratory, using ISO 18899 for guidance.
The calibration schedule given in Table c.1 has been compiled by listing all of the parameters specified in the test method, together with the specified requirement. A parameter and requirement can relate to the main test apparatus, to part of that apparatus or to an ancillary apparatus necessary for the test.
For each parameter, a calibration procedure is indicated by reference to ISO 18899, to another publication or to a procedure particular to the test method which is detailed (whenever a calibration procedure more specific or detailed than that in ISO 18899 is available, it shall be used in preference),
The verification frequency for each parameter is given by a code-letter. The code-letters used in the calibration schedule are:
N initial verification only;
S standard interval selected as given in ISO 18899.