T4 EEG Amplifier User Manual
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Appendix 1: Specifications
Note: Lifelines reserves the right to change product specifications at any time without notice. This
is in-line with the company’s policy of continual product development.
T4 Amplifier Specifications
EEG inputs
Number of EEG channels
32 referential (monopolar) inputs, expandable to 64 with
expansion option
ADC Resolution
24 bits
Sampling
250 – 16000 Hz
Input impedance
>20 Mohms
Common mode rejection ratio
>100dB @ 50 and 60 Hz
Equivalent input noise
<1.5
Vp p , < 0 . 2 u V r m s
Gain
12 ±0.5%
Max Input V
diff
750mVpp (including DC)
Quantisation
0.17uV/bit @ Gain = 12 and Bits = 22
Bandwidth (-3dB)
DC to 4193Hz
Max common mode input voltage
0.4Vpp
Input bias current
< ±0.3 nA
Front-end Calibration
8mVpp ±5% at 0.98Hz
Impedance Check current
24nA ±20% at 7.8Hz
Polygraphy inputs
Number of polygraphy inputs
8 poly (bipolar) inputs
ADC Resolution
24 bits
Sampling
250 - 16000 Hz
Input impedance
>20 Mohms
Common mode rejection ratio
>100dB @ 50 and 60 Hz
Equivalent input noise
<1.5
Vp p , < 0 . 2 u V r m s
Gain
12 ±0.5% (AC), 4 ±0.5% (DC)
Max Input V
diff
750mVpp AC setting (including DC), 2.25Vpp DC setting
Bandwidth (-3dB)
DC to 4193Hz
Quantisation
0.17uV/bit @ Gain = 12 and Bits = 22
Max common mode input voltage
0.4Vpp
Input bias current
< ±0.3 nA
Front-end Calibration
8mVpp ±5% at 0.98Hz
Impedance Check current
24nA ±20% at 7.8Hz
Aux. high-level DC Inputs
Number of Aux channels
1
ADC Resolution
24 bits
Sampling
250 - 16000 Hz
Input impedance
100 Kohms
Gain
4 ±0.5%
Max Input V
diff
2.25Vpp
Bandwidth (-3dB)
DC to 4193Hz
Connections, ports and con-
trols
Patient Connection Unit
Plug-on unit with touchproof 1.5mm sockets. Variants:
24 referential ch 8 bipolar (model T4-PCU 24+8)
64 referential ch 4 bipolar (model T4-PCU 64+4)
Aux DC Inputs
1 Jack socket 3.5mm
Patient Event Input
1 Jack socket 3.5mm
Front-panel push-button
On/Off and Patient Event