A new type of thermostat of high stability using a magnetic temperature transducer

Mechanical and electrical details together with performance tests are presented for a new type of thermostat for use at a given temperature (about 353K), which uses a magnetic temperature transducer in the shape of a small toroidal core of CuZnTi ferrite for the temperature control system. The thermostat gave a stability of +or-0.5 mK over a long period of time and a short term stability better than +or-0.1 mK when the ambient temperature was constant to within +or-0.5K. The thermostat was designed for thermostatting quartz oscillators. The associated electronics is simple and allows the use of readily available components at a low total cost.