1902s are suitable for direct connection to the subject to record a variety of biological signals including EEG, EMG and ECG. With an additional module, they can also be configured to measure skin conductance. The non-isolated transducer input allows connection to many types of transducers for capture of other data such as force, temperature, acceleration, strain and displacement.

Both Spike2 and Signal software packages include built-in control for the 1902. Each package interacts with the 1902s to automatically adjust scaling and add markers to annotate changes in amplifier settings where appropriate. Amplifier settings are stored in Spike2 and Signal sampling configurations, therefore when switching between experiments, amplifier settings are restored automatically.

Gain ranges

For EMG and ECG work, users usually choose the 100 - 100,000 gain range type, which takes a maximum signal amplitude of ±50mV.

For the smaller signals of EEG and evoked potentials, the ±5mV maximum of the 1,000 - 1,000,000 gain range is a better choice.

1902 and Spike2

Spike2 records event and waveform data into a file with a continuous time base, making it ideal for applications including sleep studies, biomechanics, behavioural experiments and cardiovascular research. Changes to the 1902 gain and other software controlled settings are recorded as text notes alongside the conditioned waveforms.

With the aid of active cursors, you can take measurements automatically while recording the amplified and filtered signals. Features from waveforms such as ECG and blood pressure can be detected, and their times, values and other measurement results plotted to an XY view for display and export in spreadsheet format. Results can also be saved inside the data document as additional channels, marking where the measurement was taken and the result.

1902 and Signal

Signal, being a frame-based recording system, is more suited to applications such as evoked response (visual, auditory, electrical, TMS). It is also ideal for biomechanical applications, for example in conjunction with force plates.

For TMS and electrical stimulation experiments, the 1902 optional input clamp is designed to suppress artefacts which would otherwise saturate the amplifier if the recording site is close to the stimulation point.

Input clamp example ×
Input clamp example
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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. ×