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Measuring Consideration
1. As the range of 20,000 Lux (2000 Fc) is designed to measure the light
values 000 Lux (200 Fc). So if the measured light values less than 2000
Lux (200 Fc), please select the “Range Switch” to the lower range to let
display reading show high resolution & be kept within high accuracy.
2..
As the range of 50,000 Lux(5000 Fc) is designed to measure the light val
-
ues 0,000 Lux (2,000 Fc). So if the measured light values less than 20,000
Lux (2,000 Fc) please select the “Range Switch” to the lower range to let
display reading show high resolution & be kept within high accuracy.
Battery Replacement
1. When the left corner of the LCD display shows LO BAT “
”, it
indicates the battery output less than 6.5 V - 7.5 V. Replacement of the
battery is then needed.
However measurements could still be taken for
another few hours before the meter becomes inaccurate.
2. Open the Battery Cover (#6 in figure on page 4) at the back of meter
and remove the battery.
3. Replace with a 9V battery and reinstall the cover.
Correction Factor for Different Types of Lighting
The light meter is calibrated under a precision “Standard light tungsten
.
incandescent source of 2856°K”. If the user intends to make
.
measurements precisely under a different light source from
“
MERCURY LAMP” or “FLUORESCENT LAMP” or
.
“
SODIUM LAMP” or “DAYLIGHT”
the measurement value can be corrected (multiplied) using the follow
-
ing factors that compare the measuring reading values tested under the
“Standard light tungsten source of 2856°K”.
MERCURY LAMP
x 1.05
FLUORESCENT LAMP
x 0.97
SODIUM LAMP
x 1.11
DAYLIGHT
x 0.95