PR-655/670 User Manual
78
FIGURE 74 - LR-55 LED RECEPTOR
Typical applications for the measurement of luminous intensity include lamps (candelas) and LED’s
(millicandelas). For the measurement of luminous intensity, the PR-655 or PR-670 can be equipped with the LR-
55 LED Receptor and or the LR-127 CIE LED Analyzer. During calibration, these accessories are calibrated using
sources where the precise area being sampled is used in calculating candelas as given by
area
m
cd
candelas
*
/
2
=
where
area
is the total emitting area of the source.
H
OW TO
M
AKE
L
UMINOUS
I
NTENSITY
/
R
ADIANT
I
NTENSITY
M
EASUREMENTS
D
ESCRIPTION
The
LR-55 LED Receptor
enables the PR-655/670 to measure the axial spectral radiant intensity (watts /
steradian) and luminous intensity (millicandelas) and color of light emitting diodes (LED's).
The
LR-55
consists of a 2.5 inch (63.5 mm) long tube with an LED port on one end and a mounting thread at the
other end. The threaded end is installed into the lens mount of the PR-655 / 670.
During use, the LED's are inserted into the LED port at the open end of the accessory. Two different sized LED
ports are supplied with the
LR-55
. One is designed to accept 0.118" (2.99 mm) diameter LED's, and the other
accepts 0.205" (5.21 mm) diameter LED's.
Note:
Special adapters can be fabricated for LED's that do not exceed 0.275" (7 mm) in diameter. Contact
Photo Research for details.
Mounting Thread
LED Adapter
Cap
LED Adapter Screws
(2 each)
LED Mounting Port
Содержание PHOTO RESEARCH SpectraScan PR-655
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