A new precision a.c. voltage stabilizer

An a.c. supply of high stability is required for many purposes, particularly metercalibration, and can be obtained only from some type of stabilizer. Few stabilizers have been designed with stabilities he order of 0.1 to 0.01%. The paper deals with the advantages and disadvantages of various basic stabilizer arrangements, and then considers in detail a special type of ¿indicator¿ using a thermistor. The theory of two types of ¿controller¿ is then discussed. The design of a stabilizer of high accuracy using the above special indicator is then considered in detail. Such a stabilizer can be produced with a stability of 0.01% and with an output upto 2 kVA.