Re: AVO Multimeter survey
The initial numbers and letters indicate the class or potential use of the item:
10A Miscellaneous Radio (Wireless) Equipment
10S Radio (Wireless and Radar) Test Equipment
The test meter type D was a versatile instrument so could be stored and referenced under either category.
But then you might wonder why it could not have been given a 5Q number:
5Q Ammeters, Micro-ammeters, Milli-ammeters, Voltmeters and Milli-voltmeters
Maybe the change came after the introduction of Radar or were binstruments with both 10A and 10S made simultaneously?
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Richard
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