Основы светотехники на английском языке, страница 12

A lux meter and a power meter or cos-ϕ meter are required to conduct the experiment. Both the power and the power factor (phase angle) can be measuredwith the Universal Power Meter (Type 1091). Measure the characteristic values on the primary and secondary side. If only a power meter or a cos-ϕ meter is available, one variable must be calculated from theother. Use the mains switch for switching on/off the unit. Please note that the lamp needs a certain warmup time before reaching full brightness. Do not look directly into the lamp, protect your eyes!Experiment:••Screw the mercury vapourhigh-pressure lamp into thesocket provided.L1First set up the circuit asshown in figure 4.3.3.1.Q1•Measure the voltage U andthe current I.•Calculate the active powerP of the mercury vapourhigh-pressure lamp fromthe values measured forvoltage and current ormeasure the active powerwith a power meter if available.Figure 4.3.3.1 Experiments setup 1 – primary side measurementP = U ⋅ I ⋅ cos ϕL1••NDetermine the power factorcos ϕ by calculation ormeasurement.Measure the illuminance Eonly at a distance of 0.5 mhorizontally to the lamp.•Enter all the measured values in the table 4.3.3.•Then set up the circuit asshown in figure 4.3.3.2 andrepeat the experiment.E1Q1NE1Figure 4.3.3.2 Experiments setup 2 – secondary side measurement80Experiments with the SPECIAL LAMP BOARDCharacteristic Values of a Mercury Vapour High-pressure LampU/VΙ/AP/Wcos ϕE / lxExperiment 1Experiment 2Table 4.3.3Evaluation:Question: What is the value of the power loss (active losses) of the operating equipment and the electrical efficiency of the illumination?Answer:Experiments with the SPECIAL LAMP BOARDComparison of the Lamps on the SPECIAL LAMP BOARD4.481Comparison of the Lamps on the SPECIAL LAMP BOARDTask:Enter the characteristic values of the lamps from the experiments in chapters 4.1 to 4.3 in table 4.4Formula symbol /UnitCharacteristic valueElectrical powerPel.

/ WPhase anglecos ϕIlluminanceE / lxLight currentΦ / lmLuminous efficiencyη/mxWLuminous intensityΙ / cdLight quantityQ / MlmhLifetL / hStart/ignition timet/sInrush/turn-on currentILight colour-----Area of application-----Table 4.4-1Halogenhigh-pressure lampSodium vapourhigh-pressure lampMercury vapourhigh-pressure lamp82Notes:Experiments with the SPECIAL LAMP BOARDComparison of the Lamps on the SPECIAL LAMP BOARDLighting Engineering – AppendixMeasuring Hints / Measuring Devices / Lamps OverviewA15 Appendix5.1 Important Measuring HintsWARNING:•Only set up the experiments when the device is switched off!•Check the connections of the supply voltage!•Don’t touch open sockets with electrical voltage!•All measurements for the illuminance have been done in a dark room with a basic brightnessof 2 lux. The measuring distance to the lamp is always r = 0.5 m!•When using high-pressure lamps according to chapter 4, the lamps must be cooled down forre-ignition!5.2 Measuring Equipment and Generators Used•Multimeter•Power meter or alternatively cos-ϕ measuring device:Both the power and the phase angle can be measured with the Universal Power Meter (Type 1091).

Ifonly a power meter or a cos-ϕ measuring instrument is available, one of the variables must be calculated from the other.•Lux meterLighting Engineering – AppendixMeasuring Hints / Measuring Devices / Lamps OverviewA2Incandescentarc lampCompact fluorescent lampHalogenhigh-pressurelampSodiumvapourhigh-pressurelampMercuryvapourhigh-pressurelampPel. / W636513511Starter: 21EVG: 18.5535062Phaseangle,increasedefficiencycos ϕ---------------0.5371 µF: 0.5123 µF: 0.8954 µF: 0.7240.8460.7770.874IlluminanceE / lx3423701 min: 8052 min: 7008 min: 645145.71Starter: 480EG: 640179710901075LightcurrentΦ / lm896.04969.41823.52381.76Starter: 1257.6EG: 1676.84708.142855.82816.15Luminousefficiencyη / m x W -114.2214.9113.5134.71Starter: 59.89EG: 90.6472.4345.3338.06LuminousintensityΙ / cd85.5892.59174.1736.46Starter: 120.11EG: 160.15449.68272.76269.01LightquantityQ / Mlmh0.91.949.123.82Starter: 10.06EG: 13.4128.2528.5642.25LifetL / h10002000500010000800060001000015000Start/ignition timet--------------------M.

Starter: 2 sE. Starter: 0.5 sEG: 2 s5 … 6 min4 … 5 min3 … 4 minI may be amultiple ofthe ratedcurrentI may be amultiple ofthe ratedcurrentUp to 1.5fold of therated currentUp to 2-fold ofthe rated currentUp to 1.4fold of therated currentUp to1.25-foldof the rated currentUp to 1.4fold of therated currentDaylight,white, warmtone, warmtone de LuxeBrilliantwhite,similar todaylightCharacteristicvalueInrush/turn-oncurrentLightcolourArea ofapplicationI---------------FluorescentlampHalogen filament lampElectricalpowerFormula symbol, unitFilament lamp5.3 Comparison of all Lamps Used in this ManualBrilliantwhite,Yellow-red similar todaylightVery similar to daylightVery similar to daylightCan beused foralmost allpurposes.The highpowergraduationand theuse ofspeciallamps cansatisfyalmost allrequirements.Streetlighting,factories,sportsfields etc.Can beSee tableused for1.4.4.3 onalmost all page 21purposes.The highpowergraduationand theuse ofspeciallamps cansatisfyalmost allrequirements.Car lamps,daylight/slide projectors, forlightingfilm andTV productions,used infloodlightsystems.Film andTV recordingsunderdaylightconditions, reporting(lampswith lowpower),production(lampswith highpower),stage(dramalighting),professionalphotographyWarmwhiteIllumination ofstreets,squaresand parksBluishwhite withhigh yellow-greencontentTraffic andfactoryhall lighting, foyers, shopping precincts, effect lighting withdownlightsand wallwashers,plant lighting, decorative interior andexteriorlighting.