Jadak PHOTO RESEARCH SpectraScan PR-655, Руководство пользователя

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PR-655/670 User Manual
79
G
EOMETRICAL
C
ONSIDERATIONS
The LR-55 is designed to measure the emittance of LED's over an 8.3

acceptance cone.
It is important to note that since the spatial distribution of LED's varies with angle, LEDs measured using
acceptance cones other than 8.3

will produce different results. Generally, measurements through smaller
cones will yield higher values, while LED's sampled over larger cones will produce measurements with lower
radiant and luminous intensity values. Therefore, as part of the measurement report it is important to note the
acceptance cone sampled during the test.
P
ROCEDURE
- LED A
DAPTER
C
AP
R
EPLACEMENT
If it becomes desirable to switch LED Adapter caps supplied with the LR-55 , proceed as follows:
1. Loosen and remove the two SAE 4-40 hex cap screws that secure the LED Adapter cap to the main tube.
2. Remove the LED Adapter cap.
3. Insert the new adapter cap making sure to align the threaded holes in the adapter with the through
holes in the tube.
4. Replace and tighten the screws. DO NOT OVER TIGHTEN THE SCREWS!!
M
AKING
M
EASUREMENTS
1. Remove the MS-75 lens or other accessory by turning counter clockwise.
2. Install the LR-55 by threading it clockwise into the PR-655/670 lens mount. Do not over tighten.
3. From the Instrument Setup menu, select LR-55 from the Primary Accessory window by touching the
▲
▼
icons.
4. Insert the LED into the adapter port and allow at least a 5 minute warm-up (unless otherwise specified).
5. Make sure the LED is properly seated in the adapter.
6. Touch the MEASURE button to begin a measurement.
U
SING THE
LR-127
O
VERVIEW
The LR-127 is designed to characterize discrete LEDs per the CIE 127 Technical Report – Measurement of LEDs. It
satisfies the report’s requirement of average luminous intensity by providing both Condition A (2°) and
Condition B (6.5°) measurement capabilities. This is achieved by actuating a slide from the A position to the B
setting. There is no need to remove the LED from the fixture during the test insuring the accurate determination
of average luminous intensity.