LUX | /F | LD |
C | HO |
| | AUTO |
MAX | U |
MAN |
| | ZERO |
6
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 fixtures that are equipped with fluores- 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 defined as the illuminance on a 1-square foot surface of which there is a uniformly distributed flux 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.
