L202PMS Photometer
Irradian Limited
1
The Irradian L202PMS digital photometer is a portable instrument
designed for accurate measurement of illuminance in lux and screen
luminance in cd.m
-2
.
The photometer comprises of a hand held display unit, a detector with
connecting cable, a cosine corrected diffuser ring, a luminance contact
probe with shadow rings and an RS232 connection cable.
The display unit houses an autoranging amplifier, 4½ digit liquid crystal
display with back light illumination and PP3 type battery. The anodised
aluminium body houses the large area silicon photodiode, detector
amplifier, and specially selected colour filter glasses that adjust the
detectors response to closely match the CIE v
(λ
) photopic response. A
profiled diffuser ring gives the detector an accurate cosine corrected
angular response for illuminance measurements. The luminance probe
interchanges with the cosine diffuser ring to enable contact
measurements of CRT or LCD screen brightness. Shadow rings can be
fitted around the probe to reduce background lighting effects.
A switch within the detector housing automatically changes the
photometer calibration between lux and cd.m
-2
with an LED illuminated to
indicate which unit is selected.
