AS NZS 1301.436:2014 pdf free

AS NZS 1301.436:2014 pdf free.Methods of test for pulp and paper
For measurements on fluorescent materials, which require a fluorescent reference standard (see 5.2) to enable the UV-content of the illumination to be adjusted, stable fluorescent working standards of plastic or other material incorporating a fluorescent whitening agent are required. These working standards are described in the relevant International Standards.Black cavity, for calibration or validation of the low end of the photometric scale. This black cavity shall have a radiance factor which does not differ from its nominal value by more than 0,2 percentage points at all wavelengths. The black cavity should be stored upside-down in a dust-free environment or with a protective cover. During calibration, the instrument shall be adjusted to the nominal value of the black cavity.
It is not yet possible to institute a system of reference standards to enable testing laboratories to check the reflectance factor of the black cavity. At the time of delivery, the level should be guaranteed by the instrument maker. Questions concerning the use and condition of the black cavity should be resolved by contacting the instrument maker.Use one plate as a primary working standard for checking and calibrating the instrument, and use the other much less frequently as a control plate for checking the primary working standard. The frequency with which the instrument needs to be calibrated depends on the type of instrument. Frequent calibration of the instrument tends to introduce undesirable fluctuations in the instrument, and the instrument should be recalibrated only when a check with the primary working standard indicates that calibration is necessary.
Check the primary working standard periodically against the control plate. If any change in the radiance factor is noticed, clean the primary working standard by the procedure described in 6.4. If the change persists, clean and recalibrate both working standards against an appropriate IR3 reference standard.AS NZS 1301.436 pdf free download.