A scanning light spot technique was used to measure the transfer efficiency of 8- and 64-bit charge-coupled device shift registers. Efficiencies of 99·87±0·03 for 64-bit devices are reported.

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The optimum operating conditions for an 8-bit three-phase p-channel CCD were established. This was done by studying the electrical output and the transfer efficiency as a function of six variables: the input and output gate voltage and the clock voltage, overlap, offset and frequency. A transfer efficiency of 99·9±0·1% was recorded for the best devices using a scanning light spot efficiency measurement technique.

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