They came with charts and detailed technical explanations of how the meters are made and tested to a degree that ensures they are far more precise than the analog models they replaced. …. In addition to being very low power, radio frequency transmitters in SmartMeter™ electric system

They came with charts and detailed technical explanations of how the meters are made and tested to a degree that ensures they are far more precise than the analog models they replaced.

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By Albert O’Grady & Jim Ryan
An analog transmitter is a field-mounted device that senses a physical parameter such as pressure or temperature and generates a current proportional to the measured variable in the standard range, 4 to 20 mA. Providing the output as a current in a twisted-pair loop has many advantages: the measurement signal is insensitive to noise and is not affected by changes in loop resistance; transmitters meeting the standard are interchangeable; and the power required to energize the transmitter circuits can be derived from a remotely supplied loop voltage. Figure 1 shows a conventional transmitter circuit, consisting of a power supply, a current-manipulating transmitter, and a receiving controller.

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