Experimental measurement basis: "Measurement Uncertainty Evaluation and Representation" (JJF1059. 1-2013)
Measurement environment: temperature 20 ± 10 ℃, relative humidity ≤ 75%RH.
Measuring instrument: Illuminance meter testo540; measuring range is (0 ~ 99999) Lux; uncertainty or accuracy or maximum allowable error is ±3% of the reference value; resolution is 1 Lux (0 ~ 19999) Lux, 10 Lux ( the rest of the range).
Object to be tested: Indoor double-ended straight tube fluorescent lamps, 2 pcs
Measurement method: According to the method stipulated in the standard "Lighting Measurement Method" (GB/T5700-2008), measure the illuminance with an illuminance meter directly below the two lamps and at a distance of 2.5m from the lamps, and record the fluctuation of the power supply voltage to ensure the measurement Conditions remain relatively unchanged.
Experimental results: The relative expanded uncertainty of the measured value of the illuminometer is Urel=5.8%(k=2).
