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Annex B Selected Instrumentation
B 1. Instrument Specifications
B 1.1 Introduction
The information found in this annex is based upon the use of particular instruments within the BSRN
network. When used following the instructions given within the m anual, it is believed that these instruments
can meet the accuracy requirements specified by the BSRN. Other instrumentation may meet these
accuracies but have not been used within the program at the time of publication of this manual.
The instrument specifications provided are those of the manufacturers. Independent tests of the instruments
have been made by a variety of laboratories and have been published in the open literature and through
technical agencies such as the International Energy Agency. For further information on any of these
instruments the reader is advised to contact either a WMO Regional Radiation Centre or the manufacturer
directly.
The purpose in providing these specifications is to enable both data users and site scientists to gain
information about particular instrument configurations. For the former, this should aid in gaining a
better understanding of the data measured by particular instruments; both strengths and weaknesses.
For the latter, the choice of an instrument for a particular site can be better determined by knowing
what others use in similar situations. Furthermore, by understanding the differences between instruments,
questions concerning differences in data quality can be addressed.
The instruments are given in alphabetical order with the specifications provided by the manufacturers.
Where possible, specifications common to each manufacturer are used. However, like most manufactured
goods, no standard methods of specifying all of the various attributes of an instrument have been adopted.
The International Standards Organization (ISO) (ISO 9060, Solar Energy - Specification and classification
of instruments for measuring hemispherical solar and direct solar radiation) and the WMO (WMO No.
8, Commission on Instruments and Methods of Observation (CIMO) Guide to Instruments and Methods
of Observation) has recommended some guidelines, but these have yet to be universally accepted.
Tables B1 and B2 on pyranometer specifications and pyrheliometer specifications found in the ISO
document are provided below as a general guide on instrument quality.
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