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The Computer Controlled Reciprocating Compressor Unit, "HCRC", allows students to study and test a fluid power machine and to discover how the compressor flow rate relates to the pressure delivered by the compressor. The unit provides a detailed analysis of a compressor performance and allows to study the energy balance, efficiencies and thermodynamics of the compressor. This unit consists of a small reciprocating compressor with an intake vessel. All controls and instrumentation are controlled from the computer. The compressor speed is variable up to the maximum allowable for the compressor. The control of the compressor motor speed allows flexibility to match the compressor motor under different conditions. The inlet air passes through an air filter and pressure regulator to provide constant pressure, clean and water free air to the unit. The air enters the compressor, which delivers it under pressure to the intake vessel. The inlet air passes to an intake vessel to reduce intake pulsations and allows various inlet conditions to be established. A valve releases pressure from the intake vessel to the atmosphere through an orifice plate. The valve sets the pressure in the intak