An inexpensive digital voltmeter using multiple-anode dekatrons

A medium accuracy digital voltmeter which is robust, reliable and inexpensive is described; particular reference is made to the decade counters, which need only be capable of counting at moderate speeds. Various types of counters are discussed, and a comparison made of their costs. The conclusion is reached that the use of a multiple-anode dekatron counting tube in conjunction with a cold cathode number tube provides the most economic method of counting. A detailed description is given of, the counters used in the voltmeter, including the drive circuits, the coupling of the dekatron to the number tube, and the reset and carry arrangements.