The thesis describes the process of development, building, calibration, and testing of a temperature measurement device with galvanically isolated thermocouple inputs and CAN communication interface.
The device supports simultaneous measurement of 16 channels with K-type thermocouples. In this sort of measurement system, the measurement circuit is electrically connected to the device under test. The input circuit is, therefore, isolated galvanically to allow the thermocouple to be bonded to electrically conductive parts where non-zero potentials may appear (e.g. the drain of a power transistor).
Configuration and calibration of the device are controlled through the CAN communication interface. The device supports a streamlined version of the CANopen protocol. This protocol was chosen because it is also used on electric motor drives, which will be tested using these devices.
The result of this project is a successfully designed measurement system which will be produced for internal use in a small batch on the company production line.