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The modulation meter "SK3-46" was produced presumably since 1987. Designed to measure the frequency deviation of the FM signals and the ratio of AM signals. The instrument can also measure the AM coefficient associated with the FM signal, and the frequency deviation associated with the AM signal. The presence of a low-frequency output and a low level of harmonics introduced into the measured signal allows using the instrument to measure the distortion of the modulation law of AM and FM signals. The frequency range of the input signal is 10 ... 1500 MHz. Overall dimensions of 260x93x375 mm. Weight 3.3 kg. A detailed description of the device is on the Internet.