Electroencephalography (EEG)
User Manual
5 of 17
1.3.
Sensor Specifications
> Gain:
41780
> Range:
±
37.5µV (@ VCC = 3V)
> Bandwidth:
0.8
–
48,23Hz
> Consumption:
~0.500mA
> Input Impedance:
> 100GOhm
> CMRR:
100dB
1.4.
Features
>
Single-channel differential sensor
>
Unobtrusive & lightweight sensor
>
Pre-conditioned analog output
>
Shielded miniaturized cables
>
High signal-to-noise ratio
>
Ready-to-use form factor
>
Medical-grade raw data output
>
Discrete elastic head band
1.5.
Applications
>
Life sciences studies
>
Biomedical device prototyping
>
Neurofeedback
>
Psycho-Physiology
>
Brain-Computer-Interfaces
1.6.
Transfer Function (Conversion Formula)
The analog sensor signals acquired with biosignalsplux devices are converted into digital values ranged
between 0 and 2
n
-1 (n=sampling resolution, usually 8-bit or 16-bit) and streamed in the raw digital
format.
In most applications, the original physical unit of the acquired EEG signal is preferred or required. The
raw digital sensor samples can be converted back into micro-Volt (µV) using the following formulas:
𝐸𝐸𝐺(𝑉) =
(
𝐴𝐷𝐶
2
𝑛
- 1 −
1
2) ∗ 𝑉𝐶𝐶
𝐺
𝐸𝐸𝐺
(1)
𝐸𝐸𝐺(µ𝑉) = 𝐸𝐸𝐺(𝑉). 1 ∗ 10
6
(2)
Valid sensor range: [-37.5µV, 37.5µV]
with:
𝐸𝐸𝐺(𝑉)
EEG signal in Volt (V)
𝐸𝐸𝐺(µ𝑉)
EEG signal in micro-Volt (µV)
𝐴𝐷𝐶
Value samples from the sensor/channel (digital value)
𝑛
Sampling resolution (default: 16-bit resolution (n=16), although 12-bit and
8-bit may also be found)
𝑉𝐶𝐶
Operating voltage (3V when used with biosignalsplux)
𝐺
𝐸𝐸𝐺
Sensor gain (40000)
1.7.
Electrode Connections & Sleeve Color Meanings
Sleeve Color
Red
Black
White
Electrode Cable
+
-
reference
See section
for more information on where to place the electrodes and to connect
electrodes cables for EEG acquisitions.
