Wandel & Goltermann PS20

Signal source for the telephony and audio frequency range, Transmitting level +16 dBm, transmit signal resolution 0.1 dB, Frequency range 20 Hz to 20 kHz, 30 fixed frequencies (20, 30, 40, 50, 75, 100, 125, 150, 160 and 200 Hz with multiplier x1, x10, x100), Internal resistance 600 ohms and 0 ohms, battery operation. PEGELSENDER

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