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Krohn Hite 3210C
The Model 3210C is a 100A calibrator and is an accurate voltage to current amplifier or transconductance amplifier. The current output is directly proportional to the input voltages from a high accuracy ac voltage standard.
The AC voltage bandwidth is 40Hz to 500Hz. The 3210C is calibrated with instruments and load resistors traceable to the National Institute of Standards & Technology.