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
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
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
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
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

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
NAICS: 423490
Commodity codes
Hardware: 84716070
Software: 85234945

By email:

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

(Int.+44) (0)1223 420186

From North America (Toll Free):

1 800 345 7794


Privacy policy

CED, through this site, does two things that relate to privacy. We would like to explain them.

Emails from down-loads

We offer free down-loads of many files on our site, from test programs to complete install files for updated versions of major packages like Spike2 and Signal.

When customers wish to take a down-load of a major package, we ask a few questions, including their name, email address, the serial number of the software for which they seek an upgrade and whether they would like an automatic email whenever we update the product. This information is emailed back to CED when they access the final down-load screen. Within this email, your browser transmits the type and version of browser you are using, and the screen resolution you are running.

The reasons why we take and keep this information are that it is useful for our software development team to know who has taken the latest versions, and it is useful for our web site development team to know which browsers people are using to view our site, and what resolution they have their screens set to.


When people down-load a major package, we try to write a cookie, a small file in your computer, that records your name, serial number of the software package, and the version you are down-loading. These files have a lifetime of one year.

The reasons for storing this information are firstly that if you ask for another down-load some other time, your details are read from the cookie and are pre-written into the form, to save you looking them up again. The other reason is that next time you access our site, your browser looks through your CED cookies and compares the versions down-loaded with the latest version numbers read from our site. If there is a later version of a product you have already down-loaded, we tell you on the home page screen, so you know that it is worth going to the down-load page again.

None of this information is ever given to anyone outside CED. ×