This was a DConly instrument, but it’s a tribute to the foresight of its designers that many of its features remained unaltered right through to the last Model 8.įrom this point on, the AVO meter went through many developments. The first AVO – so named because it could measure Amps, Volts and Ohms – was put on sale in 1923. Macadie took his idea to the Automatic Coil Winder and Electrical Equipment Company, where it was translated into reality. It occurred to him that he could ease this problem by integrating the functions of several instruments into one. The first AVO was born out of the dissatisfaction of Post Office engineer Donald Macadie with having to carry many separate instruments with him as he went about his daily work. Production has recently ceased of the very last model of analogue AVO meters, the Model 8 mk7. This was a true British icon that could trace its roots directly to one of the twentieth century’s most significant breakthroughs in instrument technology.
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