Справочник Пользователя для IDEAL INDUSTRIES 61-686

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.