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National Measurement Standards Laboratory (NMSL), also known as NML-SIRIM, has designed and developed a prototype of a new calibration system for timing devices with seven-segment LCD. The system uses colour mark sensor and dual counters, which operates based on a new calibration technique. To evaluate the performance of the calibration system and technique used, a bilateral comparison was organized with the Dutch Metrology Institute of the Netherlands, also known as VSL. The comparison protocol, traveling standards and results evaluation were all prepared and done by VSL. The results of the bi-lateral comparisons demonstrated that the proposed technique based on the developed calibration system has its own merits and offered accuracy that is comparable to the time base calibration system.

Illuminance scale is one of the fundamentals in the realisation of candela in optical radiation. The en route of the realisation is based on the fundamental process from the unbroken chain of traceability which includes from the primary standard disseminated to working standard and lastly the end user. There are many variations towards this realisation even though some of the national metrology institutes (NMI) does not have the primary standard but their traceability still valid. The realisation of National Metrology Laboratory SIRIM (NML-SIRIM), Malaysia illuminance scale is based on detector. The scale is traceable to National Physical Labortaory (NPL), United Kingdom (UK) by annually calibrating photometers and luminous intensity lamp. This paper describes measurement method and the system set-up was previously crosschecked with Korea Research Institute Standards and Science (KRISS), Republic of Korea. The agreement between both laboratories is within 0.5% the uncertainty maintained at NML-SIRIM. Furthermore, the basic measurement equation for illuminance realisation is also derived