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Depending on the levels involved, some data logger models can directly measure direct current. Except for power/energy application-specific units, most data loggers cannot measure alternating current directly and require external transducers to convert the parameter of interest into a signal that the data logger can measure and record.
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State of the art, low level DC current data logger measures and records low level DC current and is available in three different measurement ranges, 20 mA, ±160 mA and ±3 A.