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A moving coil permanent magnet type instrument can measure audio frequency AC voltages and currents using a bridge rectifier to convert AC to DC, making it suitable for communication circuits with low voltages and currents. The bridge rectifier consists of four diodes that produce a steady deflection proportional to the average current value, while the meter is calibrated in RMS values due to the form factor of 1.11 for AC sinusoidal waveforms. A multiplier resistance is included to limit the current to the

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