The invention relates to a method for testing an electronic unit (2), particularly an electronic unit (2) of a device for determining and/or monitoring a process variable, wherein the electronic unit (2) comprises a plurality of electric components. According to the invention, at least some of the electric components are combined in a group (5), to the group (5) a query signal is transmitted, the response signal from the group (5) is received, and the response signal is evaluated. Furthermore, the invention relates to a device for determining and/or monitoring a process variable.