Multichannel Temperature Monitor Compatible with PC

Publisher Summary This chapter presents a temperature monitor to measure cryogenic temperatures by means of resistive temperature sensors. This is a box of 172 × 76 × 24 mm3 connected to COM-port (RS232) of a personal computer. A four-lead technique is used to measure the resistance of the temperature sensor with respect to the precision reference resistor. The main characteristics are: the number of measured channels/sensors can be from 1 up to 15 or 16; the range of measuring direct current is from 0.5 μA to 5 mA; the range of measured resistances, R, is from 1 Ohm to 100 kOhm; the accuracy of measurements is ∆R/R