This modified version of the standard BioAmplifier was developed specifically for EOG applications where the DC voltage produced with eye movement is to be measured.
A vernier control on the front panel allows DC balancing of the input stage +/-0.5V.
In addition to the normal high pass filter settings provided with the standard BioAmplifier,
the 0.03Hz setting is replaced with a DC setting, whereby the high pass filter is
completely disabled allowing DC potentials to be measured without time constant
distortion.
With the exception of the DC amplification facility, the specification of the
DC BioAmplifier is identical to that of the standard BioAmplifier, described below.
9 settings for 24dB high pass filter from 0.01Hz – 30Hz. (5 settings EEG4/2) |
• 8 settings for 48dB low pass filter from 40Hz – 10kHz. (4 settings EEG8, fixed LP freq EEG4/2.) • Bessel filters optimized for minimal phase distortion. • Uncomplicated filter design recovers well from transients. • 8 gain settings from 200,000 – 2000 (2 settings EEG4/2, 50,000 and 25,000). • T notch hum filter, 50/60Hz. Selectable. • Internal calibrator and electrode impedance checker (not EEG4/2) • Analogue filters allow higher resolution at A-D. • Linear analogue opto-coupling. • Analogue output if required, after isolation barrier. • <5kHz sample rate. (2.5kHz EEG8) • 32Mb on board memory (different gain/filter selection for ambulatory devices). • USB interface and power. |
SPECIFICATIONS | |
NoiseLevel Common Mode Rejection Input Impedance Hum Filter 50/60 Hz Voltage Output Subject Isolation |
< 1uV RMS unfiltered R.T.I. > 100dB >100 M Ohm, 20pF > 60 dB +/-5V adjustable > 6000V, 100 M Ohm |