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MKIII OPERATOR’S MANUAL

2 SYSTEM DESCRIPTION

The Brewer MKIII Spectrophotometer is an optical instrument designed to measure ground-level

intensities of the attenuated solar ultraviolet (UV) radiation. The Brewer contains two modified

Ebert f/6 spectrometers, each utilizing 3600 line / mm holographic diffraction gratings operated in

the first order.

The Brewer is designed for continuous outdoor operation and is therefore housed in a durable

weatherproof shell which protects the finely-tuned internal components. The instrument operates

reliably and accurately over a wide range of ambient temperature and humidity conditions.

Following is a brief description of the the major mechanical, optical, and electronic assemblies

which make up the basic instrument. A more complete description of the electronic assemblies is

provided in the Brewer Maintenance Manual.

The Brewer system is comprised of a Spectrophotometer, a Solar Tracker, and Computer

equipment running Brewer control and data logging software.

Figure 2.1: Top View of Brewer Cover

2. SYSTEM DESCRIPTION

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