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This paper describes in detail how raw test data (i.e.) measured pressures, temperatures, flows and speeds) are converted into meaningful data that can be used for evaluating the performance of a gas turbine or a gas compressor. The data reduction is explained based on the basic relationships of pressure, temperature, flow and head as well s the operational characteristics of gas turbines and centrifugal gas compressors. The correct use of performance maps is explained. Gas compressors and gas turbines are covered separately due to the distinctly different procedures for data processing. A few remarks on general procedures, valid for any type of test, including the application of test uncertainties are included.
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