Polysomnography

AHNS EEG/PSG headbox 22 / 44 channels

Channel configuration and full scale input range

	22 channels	44 channels
EEG/EXG	12 referential 2 bipolar 7 unipolar 1 SpO2	33 referential 2 bipolar 8 unipolar 1 SpO2
Referential & bipolar inputs (except ECG) ECG (bipolar) Unipolar inputs:	5.050 mV / 21.21 mV / 166.7 mV (software selectable) ECG input: 166.7 mV
1 Sound	3,36 mV/14,2 mV/111mV (software selectable)
3 Flow	47.6 mV
2 Effort	47.6 mV
1 Temperature	PTC with 2252 Ω at 25°C (only 44 channel version)
1 Position	1V

Analog to Digital conversion

Range	1 Vpp
Resolution	20-bits
Acquisition rates	125, 200, 250, 500, 1k, 2k, 5k, 10k, 20k, 40k samples/s/channel (software selectable)

Input impedance

50 MΩ per input (-> 100 MΩ per channel)

Noise (referred to input)

Referential inputs	<2 µVpp
Bipolar inputs	<10 µVpp

CMRR

≥100 dB at 50/60 Hz

Filters

HW High Pass Filters

AC Coupling	HP = 0.0713 Hz (first order, 6 dB/oct)
DC Coupling	HW high pass filter, AC of DC coupling is software selectable
	LP = 23.8 kHz (first order, 6 dB/oct)
Sound	HP = 72.3 Hz (first order, 6 dB/oct)
	LP = 152 Hz ((first order, 6 dB/oct)
Flow/effort	HP = 0.7 Hz (first order, 6 dB/oct)
	LP = 33.5 Hz ((first order, 6 dB/oct)

DSP High Pass Filters

Software selectable	Off or 0.07 Hz
	(first order, 6 dB/oct)

DSP Low Pass Filters

User selectable	~ at 1/3 of software selected sampling frequency
	2 x 2nd order butterworth type, 2 x 12 dB/oct

DSP Notch Filter

Software selectable	50 or 60 Hz 1st order butterworth type
	quality factor = 2.5