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Deals mainly with the precautions and measures to be taken to ensure that analogue/digital convertors operating on the principle of successive approximation do achieve the required accuracy. The devices described are those of Hybrid Systems. It describes the operation of this type of convertor and the circumstances in which the performance (accuracy) may be degraded, discussing in turn permissible input frequencies, test procedures, and the solution to the problem of ensuring accuracy which consists in blocking the input signal, that is in artificially maintaining a constant input signal during the period during which the A/D conversion is being effected. The modalities of this procedure are described with examples of the circuitry in question. Appendices deal with the ADC/computer interface and with precautions in the use of ADCs.