A test system comprising a load device, a support frame for setting up on a power or torque measuring device to be tested, a reference power or torque measuring device and an adapter for connecting said test system to a tension mechanism configured to be connected to said power or torque measuring device to be tested, wherein said load device includes a housing and a power transmission device, characterized in that said power transmission device comprises at least first and second power transmission means (5a, 5b) which are movably mounted in said housing and arranged along a longitudinal axis, and said first power transmission means (5a, 5b) includes an end portion for receiving an input power to be transmitted and said second power transmission means includes an end portion for outputting an output power for testing said power or torque measuring device, wherein the end portion of said first power transmission means includes a link portion for connecting the end portion to a power application means, and the end portion of said second power transmission means is configured to lie flat on a power receiving portion of said support frame, applicating a power to the end portion of said first power transmission means causes a change in the position of said first power transmission means to said housing, which causes a change in position of said second power transmission means relative to said housing, at least one power transmission means is arranged between the first and second power transmission means (5a, 5b) along said longitudinal axis of said housing, and a restoring spring is arranged in said housing, said restoring spring being configured to apply a restoring power to at least the end portion of said second power transmission means against an application direction of the input power in the direction of said longitudinal axis; and said support frame is configured to receive said load device, wherein said support frame comprises: - a housing receptacle configured to receive a connection portion of said housing of said load device, - said power receiving portion configured to receive the output power of said load device, and - a bearing portion for connecting said reference power or torque measuring device to said support frame and for transmitting the output power to said reference power or torque measuring device as a tensile power. wherein said load device includes a housing and a power transmission device, characterized in that said power transmission device comprises at least first and second power transmission means (5a, 5b) which are movably mounted in said housing and arranged along a longitudinal axis, and said first power transmission means (5a, 5b) includes an end portion for receiving an input power to be transmitted and said second power transmission means includes an end portion for outputting an output power for testing said power or torque measuring device, wherein the end portion of said first power transmission means includes a link portion for connecting the end portion to a power application means, and the end portion of said second power transmission means is configured to lie flat on a power receiving portion of said support frame, applicating a power to the end portion of said first power transmission means causes a change in the position of said first power transmission means to said housing, which causes a change in position of said second power transmission means relative to said housing, at least one power transmission means is arranged between the first and second power transmission means (5a, 5b) along said longitudinal axis of said housing, and a restoring spring is arranged in said housing, said restoring spring being configured to apply a restoring power to at least the end portion of said second power transmission means against an application direction of the input power in the direction of said longitudinal axis; and said support frame is configured to receive said load device, wherein said support frame comprises: - a housing receptacle configured to receive a connection portion of said housing of said load device, - said power receiving portion configured to receive the output power of said load device, and - a bearing portion for connecting said reference power or torque measuring device to said support frame and for transmitting the output power to said reference power or torque measuring device as a tensile power. - a housing receptacle configured to receive a connection portion of said housing of said load device, - said power receiving portion configured to receive the output power of said load device, and - a bearing portion for connecting said reference power or torque measuring device to said support frame and for transmitting the output power to said reference power or torque measuring device as a tensile power.