Multichannel Systems MEA1060-Up-BC Manual - Manual (Page 51)

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7 Appendix
7.1 Technical Specifications
7.1.1 Pin and MEA Layout
The layout of standard MEA electrodes follows the scheme of a standard grid: The first digit
is the column number, and the second digit is the row number. For example, electrode 23
is positioned in the third row of the second column. The numbering follows the standard
order from left to right, and from top to bottom.
The two ground inputs G of the preamplifier are internally connected, so it does not matter,
which one you use.
MEAs are not symmetrical, please pay attention to the recommended orientation
of the MEA chip inside the amplifier: The writing NMI should be on the right side.
The following illustration shows the standard pin layout of the socket on the amplifier.
The list below shows the assignment of the electrodes to the pins of the socket. Pin 1
is the ground of the power supply, pin 2 is the ground of the signal, that is, where the
signal is referred to. Both pins are already internally connected inside the amplifier.
If you are planning to build a custom setup with a home-made filter amplifier, please be careful
with the input of the filter amplifier. Since the MEA1060-BC is a quasi DC-coupled preamplifier,
the input into the filter amplifier has to be AC-coupled, that is, there has to be a capacitor at the
input, before the signal is led into the operational amplifier. Otherwise, you will have problems
with the offset of the metal electrodes, and your filter amplifier will go into saturation.
Channels A1 to A4 are the four additional analog inputs of the MCS Standard Connector that
are not used by the MEA amplifier. You can access channels A1 to A3 via the BNC sockets labeled
Analog IN on the rear side of the data acquisition computer of the MEA-System (see also MEA-
System manual).