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The Fluke 5220A Transconductance Amplifier lets you calibrate alternating or direct current meters and shunts and the current functions of digital multimeters that measure up to 20A. A known input voltage of 1 to 20 volts produces a known output current of 1 to 20A. The 5220A is designed for those applications where 20A ac or dc current is required; for example, calibration of the upper ranges of digital multimeters, or used with a current coil to calibrate clamps and clamp meters.