... , open circuit trigger, short-circuit trigger.;2. Channel: 1, 2, 4, 8, 16, 32, 64 ;3. Amplifier bandwidth: upper webbing cut-off frequency: straight ... , 1KHz, 10KHz, 100KHz; 4. Amplifier sensitivity: <1μV / 1 digits;5. Amplifier attenuation multiples: two-group 1,2,5,10,20,50,100 ... , 0.05, 0.1, 0.2, 0.5, 1, 2, 4 Ms;10. Negative latency points (for multi-channel): 2, 4, 8, 16, 32 ...