BRITISH STANDARD BS EN 50294 1998 Incorporating Amendment No 1 Measurement method of total input power of ballast lamp circuits The European Standard EN 50294 1998, with the incorporation of amendment[.]
Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Fri Aug 31 18:45:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BRITISH STANDARD BS EN 50294:1998 Incorporating Amendment No Measurement method of total input power of ballast-lamp circuits The European Standard EN 50294:1998, with the incorporation of amendment A1:2001 and A2:2003, has the status of a British Standard ICS 29.140.99 12&23 0.95 cos α > 0.975 α < 13°, tan α < 0,23 α is 13° (R = 2L) For the sensor the angle of the incident radiation has no effect on the sensor signal strength (within the 13°), therefore no cos α correction is used for the sensor When R = 2L, the error due to different contribution in light from centre of the lamp and lamp end is maximum 0,3 % sensor lam ps 50 100 200 50 370 100 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Fri Aug 31 18:45:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 12 EN 50294:1998 o l am v e r f u p l en l l gt h - Dim ensions in mm 500 a nti - draught shield Figure — Side view of light output measurement system NOTE The sensors are in a box painted matt black internally to avoid reflected light Lamps are placed horizontally for linear double capped fluorescent lamps For other lamps the test position according to the relevant lamp data sheet applies NOTE The sensor view angle should be large enough to measure the total illuminance of the lamp(s) including the cathodes NOTE The distance of the sensor to the lamp(s) shall be at least twice the lamp length in order to ensure that the error, due to the different contributions of light from the centre of the lamp end, is a maximum of 0,3 % lamp holder A sensor A+200 B 370 255 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Fri Aug 31 18:45:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 13 EN 50294:1998 C Dimensions in mm A = Lamp length B = 1/2 Lamp length C = 2x Lamp length Figure — Top view of light output measurement system Figures and 2, requirements for positioning: a) Figures and are used both for single and linear lamp ballasts b) The same figures are used also for multi lamp ballasts (3 or lamps) with the following provisions: — The measuring position of the lamps is for four lamps: two lamps next to each other and two lamps above each other — For three lamp ballasts the measuring position is in the upper position two lamps next to each other and in the lower position one lamp in the centre The minimum distance from the light sensor to the lamp is set at least at 0,80 m, however the sensor must “see” for at least the lamp length +20 % For an amalgam lamp care shall be taken that the reference measurements and test measurements are always taken in the same position X ,X X X' R Φx α /2 L R' Φ x' Figure — Configuration of lamp and photocell sensor B all ast u nd er t est S tart er V Reference lamp S up pl y R eferen ce b all ast S u pp ly V V A W Figure — Measurement of magnetic wire wound ballast-lamp circuits Sup pl y Reference lamp Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Fri Aug 31 18:45:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 14 EN 50294:1998 Ballast u nd er t est V W A Sup pl y Ph ot ocel l A W V V Reference bal las t Figure — Measurement of AC supplied electronic ballast-lamp circuits blank Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Fri Aug 31 18:45:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Fri Aug 31 18:45:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 50294:1998 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest 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