After copper oxide instrument rectifiers became available in the late 1920s, a 20-range " Universal " version of the Avometer was introduced in 1931 having both direct and alternating voltage current ranges.
12.
The design concept is due to the Post Office engineer Donald Macadie, who at the time of the introduction of the original Avometer in 1923 was a senior officer in the Post Office Factories Department in London.
13.
However, the Avometer HR had additional 2500V ( AC ) and ( DC ) ranges which used the corresponding 1000V ranges, and were connected through two additional terminals at the top corners of the front panel.
14.
The last meter to leave the factory was an Avometer Eight Mk 7 ( Serial Number 6110-610 / 081208 / 5166 ) which was presented in February 2010 to the winner of a competition run by the Megger company.
15.
A development of the 36-range Universal Avometer incorporating automatic cut-out and internal construction similar to the Model 7 ( Basic ranges to 12A and 1200V, the former extendable with accessory current shunts ) . 167 ohms / volt.
16.
Universal AVOmeter 50-range Later known as Model 7 ( 1936 to c . 1986 ) : A " High Sensitivity " multimeter for radio servicing . ( Basic ranges to 10A and 1000V, the former extendable with accessory current shunts.
17.
Unlike many similar multimeter designs, all Universal Avometers, with the exception of the short-lived " High Resistance ( HR ) Avometer " ( c . 1948-1951 ), could measure up to either 10A or 12A ( AC ) depending on the model.
18.
The original Avometer was designed to measure direct current ( 3 ranges, 0.12, 1.2 & 12A ), direct voltage ( 3 ranges, 12, 120 & 600V ) and resistance ( single range, 0-10, 000 ohms, 225 ohms mid-scale ).
19.
The first Avometer had a sensitivity of 60 ohms per volt, three direct current ranges ( 12 mA, 1.2 A, and 12 A ), three direct voltage ranges ( 12, 120, and 600 V or optionally 1200 V ), and a 10, 000 ohm resistance range.
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