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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
Input clamp example ×
Input clamp example
Cambridge Electronic Design Limited

Registered in England: 972132

Registered office:

  • Cambridge Electronic Design Limited,
  • Technical Centre,
  • 139 Cambridge Road,
  • Milton,
  • Cambridge CB24 6AZ
  • ENGLAND.

VAT: GB 214 2617 96

Producer Registration number: WEE/BD0050TZ

Terms and Conditions of Sale

For our US customers, we can provide tax form W-8BEN, that identifies us as a UK company.

DUNS: 219151016
CAGE/NCAGE: KB797
NAICS: 423490
Commodity codes
Hardware: 84716070
Software: 85234945
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By email:

info@ced.co.uk

By post:
  • Cambridge Electronic Design Limited,
  • Technical Centre,
  • 139 Cambridge Road,
  • Milton,
  • Cambridge CB24 6AZ
  • ENGLAND.
By telephone:

(Int.+44) (0)1223 420186

From North America (Toll Free):

1 800 345 7794

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