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A 9V AC-AC adapter can be connected to the emonTx to supply an AC voltage sample. This can be used to measure the AC RMS voltage which, in turn, can be used to calculate real power, power factor, frequency and detect power flow direction.
Not all AC-AC adapter are the same. Variations in design, materials and construction mean the AC output waveform varies between different adapters.
Rating: 9V AC 500mA
Primary resistance: 700 ohm
Secondary resistance: 2.4 ohm
Quiescent power consumption: 3.9W
Supplier: unknown
Rating: 9V AC 100mA
Primary resistance: 266 ohm
Secondary resistance: 1.3 ohm
Quiescent power consumption: 2.5 - 3.4W
Supplier: Farnell http://uk.farnell.com/stontronics/ac-09100bs2-1/adaptor-9vac-1a-uk-2-1/dp/1279503?Ntt=1279503
Rating: 9V AC 300mA
Primary resistance: 1.37Kohm
Secondary resistance: 3.3 ohm
Quiescent power consumption: 1.4W
Supplier: RS http://uk.rs-online.com/web/p/products/400-6484/
Rating: 9V AC 528mA
Primary resistance: 970 ohm
Secondary resistance: 3.5 ohm
Quiescent power consumption: 1.5W
Supplier: RS http://uk.rs-online.com/web/p/products/459-853/
Rating: 9VAC 600mA
Primary resistance: 705 ohm
Secondary resistance: 2.3 ohm
Quiescent power consumption: 0W
Supplier: http://www.idealpower.co.uk/
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