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ActiveTwo
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Sample-rate options: (sample rate is adjustable by user)
2048 Hz
4096 Hz
8192 Hz
16,384 Hz
Max. number of channels @ selected sample rate:
280
152
88
56
Bandwidth (-3dB):
DC - 400 Hz
DC - 800 Hz
DC - 1600 Hz
DC - 3200 Hz
Low-pass response
5
th
order sinc digital filter
High-pass response
fully DC coupled
Digitalization:
24 bit, 4
th
order Delta-Sigma modulator with 64x oversampling,
one converter per channel
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:
1 %
Anti aliasing filter
fixed first order analog filter, -3dB at 3.6 kHz
Total input noise (Z
e
< 10 kOhm):, full bandwidth
0.8 uV
RMS
(5 uV
pk-pk
)
1.0 uV
RMS
(6 uV
pk-pk
)
1.4 uV
RMS
(8 uV
pk-pk
)
2.0 uV
RMS
(12 uV
pk-pk
)
1/f noise (Z
e
< 1 MOhm):
1 uV
pk-pk
@ 0.1..10Hz
Amplifier current noise:
< 30 fA
rms
Input bias current:
< 100 pA per channel
Input impedance Active Electrode
300 MOhm @ 50 Hz (10
12
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
> 100 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
Battery capacity, standard battery
25 Watt-hour, 3 cell sealed lead-acid
(double capacity battery is available as an option)
Battery life on standard battery
> 5 hours @ 280 channels
inversely proportional with the number of installed channels
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 uA
rms
Trigger inputs:
16 inputs on optical receiver (isolated from subject section) , TTL level
Trigger outputs:
16 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
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