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How do I know what range, or scale, to set my power/energy meter to? And what happens if I go over range?

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How do I know what range, or scale, to set my power/energy meter to? And what happens if I go over range?

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Each given range represents one level of gain of an internal amplifier. The electronics, as always, have a limited Dynamic Range. If the measured signal is too low, in other words near the bottom of the range, then it may be lost in the noise and the reading will be inaccurate and noisy.

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