CED 1902: Technical specifications

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Main amplifier
Bandwidth	DC to 10 kHz (-3dB) in DC mode 0.16 Hz to 10 kHz in AC mode
Gain accuracy	±2%

Filter response	Bessel or Butterworth
Filter slope (low- and high-pass)	2nd or 3rd order (12 or 18 dB/octave)
Low pass filter corner frequency	1 Hz - 10 kHz cont. variable
High pass filter corner frequency	0.01 Hz - 1 kHz cont. variable
Filter latency	0.35 ms (approx.)
Rectification	User-selectable

Mains notch cut (50 Hz or 60 Hz)	50 dB (typical)
Overload indicator	2 yellow LEDs (1 for each polarity) indicate when input is overrange
Control
RS232 serial line 9600 Baud
USB via optional USB-serial adaptor
Important note: The CED 1902 is sold as a research instrument and not as a medical device within the meaning of the EC Medical Device Directive.

Isolation pre-amplifier
Front end type	Low noise EEG	ECG
Input impedance	10 GOhm
Input bias current at 25°C	±150pA
Noise referred to input, 1 Hz - 10 kHz	0.3 microV rms
Common-mode rejection at 50 Hz	100 dB
Common-mode voltage range	±1 V
Input offset voltage, initial adjusted	less than 10 microV after 1-hour warmup
Gain ranges (including 1902 system board)	100 - 100,000 or 1,000 - 1,000,000
Gain step sequence	1, 3, 10 ...
Gain accuracy	±2%
Bandwidth, all gains	DC - 10 kHz (-3 dB)
Isolation voltage, continuous	1500 V DC
Isolation voltage, peak for 5 sec	2500 V peak
Input-output leakage at 240V, 50 Hz	less than 20 microA
Input clamp option	0.5 - 14 ms	-
Lead configurations	-	I, II, III, aVR, aVL, aVF and V
Calibrator	-	1 mV pulse

Transducer input
Input impedance	1 GOhm
Input bias current at 25 °C	50 nA
Common mode rejection (at x100 gain)	80 dB at 50 Hz
Bandwidth	DC - 10 kHz
Gains	x1 to x100,000
Gain step sequence	1, 3, 10
Gain accuracy	±2%
Noise 1 Hz to 10 KHz (at x100 gain)	1 microV r.m.s.

Trigger inputs
Input impedance	100 kOhms
Voltage range	±15V
Trigger polarity	Selectable
Trigger level	+1.25 (approx.)
Trigger hysteresis	+0.5V (approx.)
Output pulse	TTL negative-going
Output pulse length	3 microSec
Trigger output drive capability	0.9 mA maximum

Power supplies & dimensions, single channel 1902
1902 chassis mechanical dimensions	Width 240 x height 46 x depth 240 mm
1902 weight (approx.)	2.5 Kg
Power input	100 - 240V AC external power supply (PSU can supply up to four 1902s)
PSU weight	750g

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1902 application guide

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