(b)the operator must ensure at least once per year, and after each calibration of measuring instruments, that the calibration results multiplied by a conservative adjustment factor based on an appropriate time series of previous calibrations of that or similar measuring instruments for taking into account the effect of uncertainty in service, are compared with the relevant uncertainty thresholds.

Measuring instruments for cold water meters for non-clean water, alcohol meters, certain weights, tyre pressure gauges and equipment to measure the standard mass of grain or the size of ship tanks have been replaced, in practice, by more modern digital equipment.

keep installations and equipment in good condition and ensure that measuring equipment is calibrated regularly; and

(d)keep installations and equipment in good condition and ensure that measuring equipment is calibrated regularly; and

Light Measurement Protocols: When light measurements, such as illuminance and luminance, need to be made, a LMD shall be used with the computer monitor located in dark room conditions. The LMD shall be used to make measurements at the centre of, and perpendicular to the computer monitor screen (Reference VESA FPDM Standard 2.0, Appendix A115). The screen surface area to be measured shall cover at least 500 pixels, unless this exceeds the equivalent of a rectangular area with sides of lengths equal to 10 % of the visible screen height and width (in which case this latter limit applies) ...[+++]. However, in no case may the illuminated area be smaller than the area the LMD is measuring (Reference VESA FPDM Standard 2.0, Section 301-2H).

Representative measurements, i.e. sampling and analysis, of relevant pollutants and process parameters as well as reference measurement methods to calibrate automated measurement systems shall be carried out in accordance with CEN standards as soon as they are available.