EASYCAP is well known for its high-quality sintered Ag/AgCl electrodes, which can cope with any electrophysiological demands that are placed on them. However, such high quality electrodes are not required for every recording situation and therefore the cheaper TinCap was introduced as a cost effective solution where sintered Ag/AgCl electrodes are not required.
However, the requirements of many EEG applications can also be satisfied using electrodes with tin sensors, which are much cheaper. Therefore EASYCAP now offers caps and single electrodes with sensors made of pure solid tin, which also have great mechanical strength.
- Tin electrodes have no stable electrode potential, and recordings should therefore be made using an AC amplifier (or an amplifier in AC mode) with a high-pass filter equal to or higher than 0.3 Hz (time constant: 0.53 sec).
- Especially when they are quite new, they also have a tendency to produce random but infrequent spikes that exceed the usual EEG voltage range. An automated artefact removal routine should therefore reject sequences with max./min. values more than 150 μV apart.
- Tin electrodes need a minimum surface area of 120 square millimeters to allow for low impedances and ensure stable signals. During the mounting and filling of the cap/electrodes, care should be taken to ensure that the electrolytic medium wets as much of the sensor surface as possible. If these conditions are satisfied, tin electrodes will deliver a clear, drift-free and noise-free signal. In this case they are as suitable as any other sensor material for all clinical EEG and evoked potentials, and for most event-related potentials.
We have set out to produce mechanically strong electrodes that are absolutely waterproof, and which are equipped with cables covered in insulation that is as tough as possible. These tin electrodes are now available, either as single electrodes or mounted together in complete EEG-recording caps.
Please note: Our products are scientific equipment for INVESTIGATIONAL USE ONLY! Medical use e.g. for diagnosis, treatment of disease or other such purposes is strictly forbidden.