Specifications for biopotential
measurement system, type ActiveTwo
Mk2 with two-wire active electrodes : |
| Sample-rate options: (sample rate is adjustable by user) | 2048 Hz | 4096 Hz | 8192 Hz | 16384 Hz |
| Max. number
of channels @ selected sample rate: |
280 | 280 | 280 | 152 |
| Bandwidth (-3dB): | DC - 400 Hz | DC - 800 Hz | DC - 1600 Hz | DC - 3200 Hz |
| Low-pass response | 5th order cascaded integrator-comb (CIC) digital filter | |||
| High-pass response | fully DC coupled | |||
| Digitalization: | 24
bit, 4th order Delta-Sigma modulator with 64x oversampling,
one converter per channel |
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| Sampling skew: | < 10 ps | |||
| Absolute sample rate accuracy (over temp range: 0-70 C) | 0.1 Hz | 0.2 Hz | 0.4 Hz | 0.8 Hz |
| Relative sample rate accuracy (jitter) | < 200 ps | |||
| Quantization-resolution | LSB = 31.25 nV, guaranteed no missing codes | |||
| Gain accuracy: | 0,3 % | |||
| Anti aliasing filter | fixed first order analog filter, -3dB at 3.6 kHz | |||
| Total input noise (Ze < 10 kOhm):, full bandwidth | 0.8
uVRMS (5 uVpk-pk) |
1.0
uVRMS (6 uVpk-pk) |
1.4
uVRMS (8 uVpk-pk) |
2.0
uVRMS (12 uVpk-pk) |
| 1/f noise (Ze < 100 kOhm): | 2 uVpk-pk @ 0.1..10Hz | |||
| Amplifier current noise: | < 30 fArms | |||
| Input bias current: | < 100 pA per channel | |||
| Input impedance Active Electrode | 300 MOhm @ 50 Hz (1012 Ohm // 11 pF) | |||
| DC offset: | < 0.5 mV | |||
| DC drift | < 0.5 uV per degree Celsius | |||
| Input range | +262 mV to -262 mV | |||
| Distortion | < 0.1 % | |||
| Channel separation | > 100 dB | |||
| Common Mode Rejection Ratio | > 90 dB @ 50 Hz | |||
| Isolation Mode Rejection Ratio | > 160 dB @ 50 Hz | |||
| Power Consumption | 4
Watt @ 280 channels inversely proportional with the number of installed channels |
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| Battery capacity, standard battery | 25
Watt-hour, 3 cell sealed lead-acid (double capacity battery is available as an option) |
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| Battery life on standard battery | >
5 hours @ 280 channels inversely proportional with the number of installed channels |
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| Battery charge time (with external fast charger): | < 3.5 hours for a 100% charge | |||
| Leakage current, normal operation: | < 1 uA rms. | |||
| Leakage current, single fault | < 50 uArms | |||
| Trigger inputs: | 16 inputs on optical receiver (isolated from subject section) , TTL level | |||
| Trigger outputs: | 15 outputs on optical receiver (isolated from subject section) , TTL level | |||
| PC interface: | USB2.0 | |||
| Size of front-end, including battery-box (H x W x D) | 120 x 150 x 190 mm | |||
| Weight of front-end, including battery-box | 1.1 kg | |||
| Warranty | 3 years | |||