Development of circuitry for temperature and current measurement

The report describes the development of a system for conditioning, digitization and transmission of thermocouple signals and the measurement of mini - S TRIKE drain current . The system is based on a circuit which samples and transmits the signals to the central acquisition system while preserving signals integrity. Moreover the system is designed to minimize the electromagnetic noise affecting the low ampl itude signals from the thermocouples. T he design of the circuit is presented, describing the layout and the electronic components for the acquisition of the thermocouple s and acceleration current signals and for the data transmission. The circuit has been tested in the test stand of the neutral beam injectors of the LHD experiment ( NIFS, Japan). The results are reported and discussed.