Method and rheometer for measuring the viscosity of a specimen

A method for measuring a viscosity of a specimen with a rheometer or rotational rheometer or viscometer, the method comprising:

• using a measuring motor of the rheometer to rotationally drive a measuring shaft fastened to a first measuring part;
• placing the specimen to be examined in a measuring gap between the first measuring part and a second measuring part disposed below the first measuring part;
• adjusting the first and second measuring parts relative to each other to set a height of the measuring gap;
• using a temperature-control unit disposed below the second measuring part to control a temperature of the second measuring part;
• driving at least one of the first measuring part or second measuring part in a rotating or rotating-oscillating manner relative to each other about a common axis;
• placing an internal contour of a hood of the rheometer against at least one of the second measuring part or the temperature-control unit to surround and cover the first measuring part and the measuring gap and form a measuring space;
• using an annular duct of the rheometer or rotational rheometer or viscometer located in a region of the temperature-control unit to incorporate a temperature-control medium into the measuring space, and dissipating the temperature-control medium from the hood through at least one exit opening, the annular duct disposed completely around the temperature-control unit and the second measuring part, and the duct having entry openings between the second measuring part and the hood;
• and
• using the temperature-control unit and the placement of the duct to temperature-control the temperature-control medium in the duct and to effect uniform temperature-control of the first measuring part, of the specimen and of the second measuring part, upon the temperature-control medium flowing through the measuring space.