Project of a digital cryogenic current comparator bridge for high precision dc resistance measurements

The argument of the thesis is the project of a digital CCC bridge for accurate measurement of resistance ratios. The thesis is divided in two parts. The first two chapters are dedicated to the resistance standards technology and the normal Direct Current Comparator bridge. Then a chapter describes the electronic circuit of the bridge. The next describes the cryogenic parts of the bridge: the flux detector, the CCC with its probe and the shields systems