Analogue-to-digital converters, usable in the systems specified in 1.A., having any of the following characteristics: a. Designed to meet military specifications for ruggedised equipment; or b. Designed or modified for military use and being any of the following types: 1. Analogue-to-digital converter “microcircuits”, which are “radiation-hardened” or have all of the following characteristics: a. Having a quantisation corresponding to 8 bits or more when coded in the binary system; b. Rated for operation in the temperature range from below -54 o C to above +125 o C; and c. Hermetically sealed; or 2. Electrical input type analogue-to-digital converter printed circuit boards or modules, having all of the following characteristics: a. Having a quantisation corresponding to 8 bits or more when coded in the binary system; b. Rated for operation in the temperature range from below -45 o C to above +55 o C; and c. Incorporating “microcircuits” specified in 14.A.1.b.1.