9-3
HDW-750/750CE V1
Luxmeter
Light source
Chart
9-1. General Information on Electrical Alignment
Setting Illuminance (In case of using reflective-
type chart)
Measuring equipment : Luxmeter (pre-calibrated)
1.
Turn on the light source that illuminates the chart and
allow it to warm-up for about 30 minutes.
2.
Fix a luxmeter in front of the reflective-type chart.
Obtain an illuminance of 2000 lx uniformly over the
entire surface of the chart by adjusting the position and
angle of the illuminations.
n
Place the light source at the same height and direction
of the camera that shoots the chart surface.
Setting Luminance (In case of using transparent-
type chart)
Measuring equipment : Photometer (Minolta LS-110 or
equivalent, pre-calibrated)
1.
Turn on the pattern box and allow it to warm-up for
about 30 minutes.
2.
Place the pattern box such that direct light does not fall
on the chart surface.
(Alternatively, place a cover the inside of which is
painted with unglazed black, around the entire chart.)
3.
Fix a photometer 1 m in front of the chart in the
pattern box.
4.
Obtain the luminance of 573
±
6 cd/m
2
at the center of
the chart by adjusting the BRIGHTNESS control of
the pattern box.
n
Adjusting luminance of 573
±
6 cd/m
2
creates the same
illuminance of 2000 lx on the reflective-type gray-
scale chart with reflection of 89.9%.
Chart
Photometer
1 m
