3
3.
General Description
3-1. General Description
Sky Scanner MS-321LR is designed to measure Luminance and radiance of 145
points of sky hemisphere. The sensor with aperture angle at 11 degrees and the
tracker having two-axis control measure distribution of both luminance and radiance.
Sky Scanner MS-321LR has improved tracking mechanism that achieves high
durability of driving.
In addition, the renewed software increases its user friendliness. There is no change
in the specification of optical head equipped with luminance and radiance sensors.
3-2. Characteristics
１
Sky Scanner MS-321LR tracks 145 points of sky hemisphere. The sensor with
aperture angle at 11 degrees and the tracker having two-axis control measure
distribution of both luminance and radiance in 4.5 minutes.
Measurements of 145 points are based on the CIE108-1994 recommendation. (CIE -
International Lighting Commission, IDMP - International Daylight Measurement
Programme)
Sensors must be calibrated before shipment. Luminance value can be measured per
kcd/m
2
and radiance value per W/m
2
/sr.
２
The renewed software is capable of color and text display of luminance and radiance
values.
Besides, it can produce animation display showing data of the same date.
If the user presets site parameters, solar position that is altitude or azimuth angle
will be calculated and displayed on the screen. Also the data can be stored.
The data of the previous MS-301LR can be loaded and displayed on the screen.
3-3. Block Diagram
Block diagram of Sky Scanner MS-321LR is shown below.
Figure 1
．
Block Diagram
Power Supply
：
100-240V,
50/60Hz
PC Power supply : depends
Tracker
Optical Unit
PC
(Optional)
RS232C
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