Conditioning system for a test bench

A conditioning unit for a conditioning system of a test bench for conditioning an operating medium of a test object circuit (PK) of a test object (P) mounted on the test bench to a predefined setpoint temperature (T_SOLL), wherein at least one mixing unit supply connection and at least one mixing unit outlet connection are provided on the conditioning unit for connecting the conditioning unit to a mixing unit which is fluidically integrated into the test object circuit (PK), wherein the at least one mixing unit supply connection and the at least one mixing unit outlet connection are fluidically connected within the conditioning unit to form a part of a conditioning circuit (KK) for the operating medium, wherein a main flow line of the conditioning circuit (KK) connected to the at least one mixing unit supply connection is divided in the conditioning unit into at least two partial flow lines, wherein each partial flow line is connected with the at least one mixing unit outlet connection, wherein the operating medium is able to be conditioned in a partial flow line to a predefined conditioning temperature (T1, T2), and the at least one further partial flow line is able to be flowed through by unconditioned operating medium having a relatively higher or lower neutral temperature (T3) compared to the conditioning temperature (T1, T2), wherein a flow rate of the operating medium in the at least two partial flow lines is able to be adjusted as a function of the predefined setpoint temperature (T_SOLL) in the test object circuit (PK).