temperature measurement with thermocouples is made more accurate , and the cost of disposable thermocouples is reduced by locating the cold junction close to the hot junction , utilizing a thermistor in thermal communication with the cold junction in developing a compensating voltage which varies with temperature as does the voltage produced by the cold junction , and applying the compensating voltage to cancel the cold junction voltage . the presence of radio frequency fields in the region of the thermocouple is detected and utilization of the thermocouple voltage is interrupted in intervals when the interference is greater than some preselected intensity . further , the thermocouple voltage information is utilized to simulate the resistance a thermistor would have at the temperature represented by the thermistor voltage information and that simulated resistance is applied to instrumentation designed to measure temperature with a thermistor .