User Guide

OPERATIONAL GUIDE
Recommendations for Users
Before using this product, make sure that it is entirely suitable for the
environment in which they are used.
Operation of this instrument in residential area could cause unaccept-
able interferences to radio and TV equipments, requiring the operator
to take all necessary steps to correct interferences.
Any variation introduced by the user to the supplied equipment may
degrade the instrument’s EMC performance.
To avoid electrical shock, do not use this instrument when the voltage
at the measurement surface exceeds 24VAC or 60VDC.
To avoid damages or burns, do not perform any measurement in
microwave ovens.
ISTR97500R1 09/02
• The meter is supplied complete with a 9V battery. Remove
the battery compartment cover on the back of the meter
and install the battery while paying attention to its
polarity.
• Put the light sensor on a stable surface and the meter at
a proper distance to avoid any interference or disturb to
the illumination of the sensor.
• Turn the meter on by pressing the
ON/OFF key.
• Press the RANGE key to select the
proper scale according to the in-
tensity of the light.
• “1. “ on the LCD indicates that it
is necessary to change the measure
scale. Press again the RANGE key.
The decimal point moves through
the display and finally the correct
value is shown.
• Wait for about 1 second for the reading to stabilize.
• After 7 minutes of nonuse, the meter shuts off.
Note: it is recommended to check if the sensor is clean before
taking any measurement.
BATTERY REPLACEMENT
When the battery becomes weak, the
meter displays a blinking “V” on the
left side of the LCD.
When the low battery indicator appears only a few hours of
battery life is remaining. A low battery level may also result
in unreliable measurements. It is recommended to replace
the battery immediately.
Unscrew the 3 screws on the back of the meter, remove the
battery cover and replace the battery while paying atten-
tion to its polarity. Make sure that the battery contacts are
tight and secure before replacing the cover.
Replacement must only take place in a nonhazardous area
using an alkaline 9V battery.
LIGHT MEASUREMENT
Illuminance is measured by Luxmeters in lux scale, which can
achieve up to 200 Klux for reliable outdoor readings.
For accurate measurements the photosensor has to be cosine
and color corrected.
The cosine correction allows for the effects of light falling on the
cell at oblique angles, while color correction is necessary to
match the spectral sensitivity of the human eye, and it is
defined by the CIE Vλ (“V-lambda”) curve.
The color correction filters usually limit the sensitivity to UV
(ultraviolet) and IR (infrared) radiations.
Note: in many situations the “measuring plane” is either not
specified or nonexistent. In these cases, a height of one
meter above ground or floor level is generally consid-
ered acceptable.
SPECIFICATIONS
Range 0.001 to 1.999 Klux
0.01 to 19.99 Klux
0.1 to 199.9 Klux
Resolution 0.001 Klux
0.01 Klux
0.1 Klux
Accuracy ±6% of reading ±2 digits
Calibration Factory calibrated
Light Sensor Human-eyes-response silicon photodiode
with 1.5m coaxial cable (fixed)
Battery Type 1 x 9V alkaline
Battery Life 200 hours of continuous use
Auto-off after 7 minutes of nonuse
Environment 0 to 50°C (32 to 122°F); 100% RH
Dimensions 164 x 76 x 45 mm (6.5 x 3.0 x 1.8")