We purchased Nihon kodhen input box and amplifier in 2004. Our experience is that this device is not appropriate to use for online data collection and analysis. But I am not sure whether there are some improvements in this aspect.
Dear Sanjaya Vipula Bandara, your question does not say wheteher you already use/ have this equipment or not. As in another thread, Nihon Kohden equipment is very reliable, but in the end, the utility of equipment lies in the user. You can see use of EEG equipment in references on my page for sleep studies, including paediatric sleep studies, studies of attention and also BCI. Hope this helps. Best wishes