Irradian Limited
L202PMS Photometer
6
SETTING UP
With the unit OFF, plug the detector connector into the socket on the top
of the display unit.
Note during operation the photometer may autorange the display
between the
three range
s
as
the measurement signal exceeds the
maximum or minimum measurement capability on each range.
ILLUMINANCE MEASUREMENTS
Ensure cosine diffuser ring is fully screwed onto the detector assembly
for illuminance measurements. Note, if the white cosine diffuser on the
filter ring is marked or dirty, clean before use. The lux LED must be
illuminated. Place the detector at the required measurement position
ensuring that the you do block any light onto the detector and record the
illuminance values.
LUMINANCE MEASUREMENTS
Remove the cosine diffuser ring and screw the luminance probe onto the
detector assembly. If required, slide a shadow ring onto the end of the
probe. The cd/m² LED must be illuminated. When measuring screen
luminance gently place the probe onto the CRT or LCD with the rubber
'O' ring uniformly touching the screen. The shadow ring can be moved to
touch the screen, thus removing any background reflections.
Note the area being measured by the probe, 9mm
φ
, must be uniform,
otherwise the meter will average the luminance from the part of the
screen being measured.
ZEROING THE PHOTOMETER
It is good practice to zero the photometer prior to use. Cover the
luminance probe or cosine ring and press the zero button. Continue
blocking the detector whilst the display shows - b g - (background). The
zero operation is complete when the display shows a reading of 00.00
(lux or cd/m²).
