Irradian Limited
L203 Photometer
8
SETTING UP
1) With the unit OFF, plug the detector 8 way connector into the socket
on the top of the display unit.
2) Carefully screw the filter ring for illuminance measurements, field of
view or contact probe for luminance measurements to the detector
housing. Note: Clean the white diffuser on the filter ring or the lens on
the field of view probe if they are marked or dirty.
3) Press and release the power switch on the L203 display key pad. The
micro controller will initiate with the display momentarily showing:-
The photometer will now search for the optimum range on the detector
amplifier. A typical display is shown below.
An LED will illuminate indicating the units. This will be the same units
prior to the last power off.
4) Press and release the
UNITS
switch to select the correct units
required. For illuminance measurements with the CIE Cos-112
photopic filter rings the correct units are either lux or fc. For luminance
measurements with the CIE FOV-112 photopic field of view or contact
probe the correct units are either cd.m
-2
or fL.
5) It is recommended that the photometer amplifier is nulled periodically.
Place the cover over the filter ring or the end of the field of view or
contact probe. Press and release the
ZERO
switch, the display will
momentarily show:-