... .;2. Channel: 1, 2, 4, 8, 16, 32, 64 ;3. Amplifier bandwidth: upper webbing cut-off frequency: straight, 1MHz, 100KHz, 10KHz ... frequency: straight, 100Hz, 1KHz, 10KHz, 100KHz; 4. Amplifier sensitivity: <1μV / 1 digits;5. Amplifier attenuation multiples: two-group 1,2,5 ... ,10,20,50,100,200 attenuation;6. Amplifier input impedance: 1KΩ;7. Launch pulse voltage: low voltage: 160V ...