The 1902 programmable amplifier/filter

IMPORTANT NOTE: We are unable to offer the 1902 for sale in the EU due to new RoHS waste disposal legislation. This in no way compromises the safety specifications of the 1902.

The 1902 is research equipment and is not sold as a medical device within the meaning of the European Medical Devices Directive.

The 1902 amplifier is controlled by a serial line at 9600 Baud. It may be specified for general purpose transducer use, or with medical-specification isolation. This single-channel unit may also be ordered as stacks of 2 or 4 units with internal power and serial data connections, normally up to a maximum of 8 channels or 32 using special cabling, see below. The isolated 1902 is designed to meet BS 5724 (EN 60601-1). More details

The standard isolated input module is a low-noise stage, suitable for 3-electrode EEG or EMG signals. ECG signals can also be recorded using either the standard input or the optional lead-switching input module.

The low noise input has a unity-gain buffer option for common-reference applications, to reduce the effect of signal output impedance on the common mode rejection. There is also an input clamp option for fast-response studies involving magnetic or somatosensory stimuli.

low noise
Single channel $2635
Dual channel $4680
Quad channel $8775
Input buffer $135
Input clamp (per channel) $255
1902 accessories

Multiple rack-mounted quad-channel 1902 units can be controlled by a serial buffer board



Rack mount option for quad-channel 1902, at time of order.



4 channel battery powered head stage for use with both concentric and wire needle electrodes



2 channel battery powered head stage
The 1902-10-HS2 and HS4 are now offered with 1.5mm touch-proof connectors as standard.



16 channel electrode adaptor box, 1.5mm safety sockets, including input buffer terminals



8 channel electrode adaptor box, 1.5mm safety sockets, including input buffer terminals



4 channel electrode adaptor box



2 channel electrode adaptor box



Flight case for Quad-channel rack-mounted 1902


1902-10 battery powered head stage
1902-11-4 electrode adaptor box

The 1902-11 electrode adaptor boxes are designed to receive 1.5mm electrode plugs in safety (touchproof) sockets and to connect them by a 1.2m screened cable to the standard 1902 isolated input connector. Sockets for connecting 2mm electrode plugs can be made available on request.

Versions for 2, 8 or 16 channels are also available.

Where multiple channels share a common reference line, channel 0 of the 1902s should have an input buffer to reduce the common electrode capacitance loading.

The 1902-11-4 may be ordered with a switch, to select for all four channels, whether the signal is to be treated as bipolar, or for all four channels to have a common negative electrode.

CED 4002 electrode adaptor box

The CED 4002-8 and CED 4002-16 are passive electrode adaptor boxes to adapt 8 and 16 electrodes to CED1902 isolated inputs. The electrode adaptor boxes are supplied with 1.5mm touchproof electrode input terminals as standard. Sockets for connecting 2mm electrode plugs can be made available on request. The outputs are taken via 1200mm captive screened cables that are fitted with 6-pin DIN connectors to mate with the isolated input connectors on a set of CED1902s. Other cable lengths are available to special order.

Each channel arrives on three leads: positive, negative and the common reference. Switches on the adaptor box allow the negative input of each channel to be connected to either its own input connector or to the output of the buffer. There is a separate switch that connects a channel’s common input line to either its own input socket or to the global common input connector. When both switches of a channel are in the local position, that channel is isolated from all other channels.

The boxes are metal, to give screening for the electrode signals. They are connected to the screens of the output cables, and should not be connected to mains earth.

4002-8 1.5kg 193 x 105 x 159 mm (W x H x D)
4002-16 3kg 352 x 100 x 180
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. ×