Digital carry applied to successive approximation digital voltmeters

Successive approximation encounters difficulties, when used in high resolution voltmeters, due to the settling time of the decision loop. Solutions so far have either slowed the reading rate, or have significantly increased complication and cost. Digital carry solves the problem both simply and inexpensively. It is applied to a voltmeter which, at 50 readings per second, has a scale length of 100,000.