Specifications

MODEL 370 REV: D Page 16 of 26
sets to measure the blackbody temperature of incandescent sources, red
photometric filters to precisely match the red response of the human eye,
fiber optic probes, reflex viewing modules to convert the radiometer into a
teleradiometer or microradiometer and many other accessories.
In addition special head assemblies are available which allow the user to
measure ultraviolet light precisely, as well as heads for measuring Helium-
Neon laser compliance and light emitting diode output.
The UDT Instruments optional accessories brochure describes the complete
range of accessories.
6.2 Illuminance Measurements
6.2.1 Purspose
To measure the illuminance of a source such as the illumination level in an
office or factory or photographic exposure times.
6.2.2 Equipment
A - Radiometer/Photometer Indicator Unit
B - detector and cable
C - photometric filter (Model 111)
D - diffuser (Model 112)
6.2.3 Procedure
1. Connect the instrument to the detector using the cable supplied.
2. Attach the photometric filter onto the detector housing with the filter
between the detector and limiting aperture and attach diffuser onto the
filter.
3. Position the head as desired to make the measurement. The
conventional measurement of illumination is done with the head
positioned at the work plane pointing vertically upwards (see Figure E-
4).
4. Make sure that the measurement is not affected by the shadows from
the operator or any other obstacles. The diffuser “sees” objects up to
90º away from the aiming direction.
5. Refer to the calibration sheet. This will indicate which channel should
be used, what multiplication factors are applicable, and what
attachments or other conditions apply. (Normally illuminance
measurements are made with a diffuser, however sometimes
illuminance measurements are done without the diffuser when high
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