IEC 61228:2020 pdf download – Fluorescent ultraviolet lamps used for tanning – Measurement and specification method.
3.7 action spectrum efficiency of monochromatic radiations for producing a specified phenomenon in a specified system [SOURCE: IEC 60050-845:1987, 845-06-14, modified – Definition revised.] 3.8 effective adjective that, when applied to a quantity pertaining to electromagnetic radiation, indicates that the quantity referred to is weighed according to a specified action spectrum 3.9 nominal value approximate quantity value used to designate or identify a lamp [SOURCE: IEC 60050-151:2001, 151-16-09, modified – Definition revised and note deleted.] 3.10 rated value quantity value for a characteristic of a lamp for specified operating conditions Note 1 to entry: The value and/or conditions are specified in this document or assigned by the manufacturer or responsible vendor. 3.11 irradiance maintenance ratio r rated value of the ratio of the effective UV irradiance weighed according to the erythema action spectrum (250 nm to 400 nm) at a specified time to initial values 3.12 initial value electrical and radiometric characteristics measured at the end of a 5 h ageing period 3.13 maintenance code description of the depreciation of the UV irradiance lamp during operation between 5 h and 500 h 4 General test conditions Ageing 4.1 Before the initial measurements, lamps shall be aged for a period of 5 h ± 0,25 h. The ageing shall be performed in accordance with Annex C. 4.2 Operating position During measurement, lamps shall be operated in a horizontal position. Ageing is preferably in a horizontal position; a vertical position may also be applied. Single capped lamps shall be positioned such that the sensor sees both legs of the lamp (see Figure 1). If the lamp has more than two limbs, the manufacturer or responsible vendor shall specify the measurement position.
4.5 Ballast Lamps shall be operated with a ballast that generates electrical values for the operation of the respective lamp that match the values given by the corresponding lamp manufacturer or responsible vendor. The ballast shall be operated at a frequency of 50 Hz or 60 Hz. The frequency shall be specified for each measurement. 5 Test requirements General 5.1 Spectroradiometric measurements shall be made in accordance with the relevant recommendations of the CIE (International commission on illumination), as given in CIE 63. NOTE 1 Additional information about UV measurements is given in Annex B of IEC 62471:2006. NOTE 2 Additional requirements for electrical measurements are given in Annex B of IEC 60081:1997, Annex B of IEC 60081:1997/AMD2:2003, Annex B of IEC 60081:1997/AMD4:2010, Annex B of IEC 60081:1997/AMD5:2013 and Annex B of IEC 60901:1996, Annex B of IEC 60901:1996/AMD2:2000, Annex B of IEC 60901:1996/AMD5:2011 and Annex B of IEC 60901:1996/AMD6:2014. 5.2 Spectroradiometric measuring system Lamps shall be measured in a spectroradiometer system to obtain the spectral irradiance. The system input optics shall have a cosine response to accurately measure irradiance. The spectroradiometer shall have a bandwidth at a given wavelength not exceeding 2,5 nm and its wavelength resolution shall not be higher than 1 nm. The distance between sensor and lamp axis, D sensor , shall be (25 ± 0,5) cm (see Figure 1). NOTE A bandwidth at a given wavelength of 1 nm is preferred for greater measurement accuracy in cases where a rapid change of the spectral irradiance occurs within a small bandwidth area.
6 Measurement and evaluation procedure Measurement 6.1 6.1.1 General The spectral irradiance shall be measured at intervals of 1 nm from 250 nm to 400 nm. Under the test conditions, the lamp power, current and voltage shall be recorded. The lamp shall be in stable electric and radiometric conditions. 6.1.2 Double capped fluorescent UV Lamps Double capped UV fluorescent lamps shall be operated during measurement such that the lamp axis is at the same height as the centre of the entrance aperture of the sensor. The sensor shall be placed in front of the middle of the lamp (see Figure 1). Reflector lamps shall be operated such that the non-reflecting side is directed towards the entrance aperture of the spectroradiometer. Lamps having a portion with no phosphor layer shall be positioned, such that the uncoated portion is directed centrally towards the entrance aperture of the spectroradiometer.