IDEAL INDUSTRIES 61-686 Camera Accessories User Manual


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INSTRUMENT DESCRIPTION
1. Display(LCD):Displaysmeasurementsandfunctionsymbols
2. Power Button: Switches the meter on and off.
3. LUX/FC: Unit of measure button
4. MAX: Maximum hold button
5. HOLD: Dataholdbutton
6. MANU: Manual range button
7. AUTO: Auto range button
8. ZERO: Auto zero button
9. LIGHT SENSOR
INTRODUCTION
The61-686metermeasureslightfromxturesthatareequippedwithuores-
cent,metalhalide,high-pressuresodiumandincandescentlightsources.
The foot-candle unit is defined as the amount of illumination the inside
surfaceanimaginary1-footradiusspherewouldbereceivingiftherewerea
uniformpointsourceofonecandelaintheexactcenterofthesphere.Alterna-
tively,itcanbedenedastheilluminanceona1-squarefootsurfaceofwhich
thereisauniformlydistributeduxofonelumen.Thiscanbethoughtofas
theamountoflightthatactuallyfallsonagivensurface.Thefoot-candleis
equaltoonelumenpersquarefoot.
TheSIderivedunitofilluminanceisthelux.Onefoot-candleisequalto
approximately10.764lux,althoughinthelightingindustry,typicallythisis
approximatedas1footcandlebeingequalto10lux.
61-686
Light Meter
LUX/FC
HOLD
MANU
MAX
AUTO
ZERO
1 5
9
6
7
4
2
8
3
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