Thermostat and testing machine provided with the same

摘要

A thermostat (1) includes a plate body (2), a heat insulator (3), and an electric heater (5). The plate body (2) defines a cavity (8) therewithin. The plate body (2) has on its bottom two openings (11) and (12), which communicate with the cavity (8) and function as a cooling medium inlet and a cooling medium outlet, respectively. The outer periphery of the plate body (2) is covered with the heat insulator (3). That prevents heat intrusion and/or dissipation from the outer periphery of the plate body (2) in transferring heat between the mounting face (7) and a heat transfer medium within the cavity (8). That reduces the thermal influence on the mounting face (7), thereby ensuring more uniform temperature distribution on the mounting face (7).