IDEAL INDUSTRIES 61-686 - Manual (Page 3)

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.
Nbr. of Lumen
Area (sq. foot or sq. meter)
Nbr. of Lumen = Nbr. of foot (or meter) x area
Foot-candle / Lux conversion
1 foot-candle = 10.764 lux
1 lux = 0.09290 foot-candles
(sq, foot or sq. meter)
OPERATING THE METER
1. Press the “ “ button to turn the power on or off
2. Remove the sensor’s cap and place the sensor in the area to be measured.
3. Press the Lx/Fc button to select the desired units of measure. Fc is the
default.
4. Read the light level on the display. If the measurement is out of range, an
OL will appear in the display. Press the Range button to change the range.
5. To save the current value on the LCD press the Data Hold button. Press
the Data Hold button again to resume normal measuring.
6. To capture the maximum reading while taking measurements, press the
Max Hold button to capture the maximum value. Press max Hold button
again to resume normal measuring.
7. After testing, replace the light sensor cap and press the power button to
turn off the meter.
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