Specifications

MODEL 370 REV: D Page 19 of 26
multiple reflections (0.5W max).
2500 Laser Integrating Sphere 1,000 Not spectrally flat, needs single
point calibration (100W max).
2525 LED Integrating Sphere 1,000 Not spectrally flat, needs single
point calibration (10W max).
2550 Laser Attentuator 100 Not spectrally flat, needs single
point calibration (0.5W max).
2575 Mini Integrating Sphere 500 Not spectrally flat, needs single
point calibration (10W max).
Refer to the option accessories brochure for the description of the attenuators.
1. Attach the attenuator as shown in Figure E-5.
2. Perform the measurement as outlined in Section 6.3.3.
6.4 Luminance Measurements (Also Radiance, Luminous And Radiant Intensity)
6.4.1 Purpose
To Measure the Luminance (or radiance) of extended sources such as
projection screens, cathode ray tubes, etc. (Also to measure the luminous or
radiant intensity of a point source).
6.4.2 Equipment
A – UDT Instruments Indicator Unit
B – detector and cable
C – photometric filter (Model 111)
D – 15º lumilens (Model 1153)
6.4.3 Procedure
1. Connect the instrument to the detector using the cable supplied.
2. Screw the photometric filter onto the detector housing and screw the
lumilens onto the filter.
3. Point the head towards the extended source as shown in Figure E-6
4. Make sure that the source is uniform and subtends at least a 15º
angle at the detector.
5. Refer to the calibration sheet. This will indicate which channel
should be used, what multiplication factors and what attachments or
other conditions apply.
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