Alpha400

The Alpha400 amplifier has been designed to accommodate a wide range of neurofeedback application requirements. The Alpha400 features 4 EEG input channels, plus an additional 3 auxiliary inputs for interface to external devices. The Alpha400 amplifier features a uniquely powerful range of programmable features enabling:

The ability to switch between 2ch and 4ch modes

The ability to internally link the REF inputs

Precision internal programmable calibrator

True 3-position analog gain control

Switchable powerline notch filtering

Remote PowerON / PowerOFF and AUX Enable / Disable

	SPECIFICATIONS:

	Number of Channels:		4 EEG channels (each pair has 2 active inputs and 1 REF input) + 3 DC AUX channels
	Input Noise:		1.0uVs p-p referred to input
	Input Impedance:		> 10 Gig Ohms
	CMR:		> 100dB
	EEG Input Range:		Selectable as: 50uV, 100uV, or 500uV p-p Full Scale
	AUX Input Range:		0 to 1.0 VDC (isolated)
	BandPass:		0.5Hz to 55Hz (at the -3dB points)
	PowerLine Rejection:		> 50 dB
	Notch Filter:		Selectable as: 50Hz, 60Hz, or OFF
	Impedance Test:		Simultaneous test of all electrodes (range: 1K to 50K ohms)
	Calibration:		Precision Digital Synthesizer to produce any frequency from 0.1Hz to 99.9Hz (accuracy +/- .01Hz)
			Calibration voltage: 0, 5, 10, 15, 20, 25, 50, 75, 100 uV p-p (accuracy +/- 2%)
	A-D Resolution:		16 bits
	Sample Rate:		256 Samples/second
	Interface:		Isolated USB interface
	Power:		All power derived from USB cable (no batteries required)
	Isolation:		Medical grade digital isolation per UL1577 Component Recognition Program.
			Each isolator fully tested at 3000V RMS for 1 second, and 2500V RMS for 1 minute.
			Internal isolated DC-DC converter rated at 6000VAC isolation.

Note: The precision internal programmable calibrator of the Alpha400 is the ideal tool to allow for exact verification of the response parameters of the EEG bandpass filters used in your clinical designs.