For more info on Measuring Field potentials using MEA chips one may read books, visit labs or check for other web contents. Here are some choices for reading material.

Books:

1. Boven K-H, Fejtl M, Moller A, Nisch W, Stett A. On Micro-Electrode Array Revival. In: Baudry M, Taketani M, eds. Advances in Network Electrophysiology Using Multi-Electrode Arrays. New York: Springer Press; 2006: 24-37.
2. Thomas CA, Springer PA, Loeb GE, Berwald-Netter Y, Okun LM. 1972. A miniature microelectrode array to monitor the bioelectric activity of cultured cells. Exp Cell Res. 74: 61-66.
3. Warwick, K, Gasson, M, Hutt, B, Goodhew, I, Kyberd, P, Andrews, B, Teddy, P and Shad, A:"The Application of Implant Technology for Cybernetic Systems", Archives of Neurology, 60(10), pp1369-1373, 2003

Webliography:

http://en.wikipedia.org/wiki/Multielectrode_array

Video References:

http://www.youtube.com/watch?v=E8l3_kAUe0w
http://www.youtube.com/watch?v=RTgoRmDJvmE