The SR-1R is a single-channel solar irradiance data logger.  Setup the Logger using the Electrosoft software, then fit the sensor to the position that you're going to measure.
 
This logger is designed to be installed by a competent person.  Once you're set up, just press the Start button to start logging!  The indicator will flash Green when logging.
 
When the logger's finished recording (or you've captured enough data!) just disconnect from supply, hook it up to your PC and download the information.  Electrosoft will let you view the data immediately on-screen and save or export for later analysis.