The 3340 Variable Electronic Filter is digitally tuned over the range from 0.001Hz to 99.9kHz. Passband gain: (0 dB, 10 dB or 20 dB); Attenuation rate: 48 dB per octave, Max attenuation: >80 dB; Output hum and noise: <500 ?V; Max output voltage: ?7 V p-p to 500 kHz decreasing to ?3 V p-p at 1MHz; 50-ohms impedance.