Multichannel Systems MPA2I User Manual

Channel miniature preamplifier

Multi Channel Systems
MCS GmbH
Aspenhaustrasse 21
72770 Reutlingen
Germany

Fon +49-7121-9 09 25- 0
Fax +49-7121-9 09 25-11

[email protected]
www.multichannelsystems.com

Product information is subject to change
without notice.

2-Channel Miniature Preamplifier

2-Channel Miniature Preamplifier
Input Connectors

Pin 1

GND (Ground)

Pin 2

Reference input

Pin 3 and 4 Recording channels 1 and 2

2-Channel Miniature Preamplifier 15-Pin D-Sub Male Connector

Pin 1

GND (Power Ground)

Pin 9

GNDS (Signal Ground)*

Pin 15

Positive supply voltage

Negative

supply

voltage

Pin 3, 11, 4, 12, 5, 13, 6, 14, 7 (GND) Ground
Pin 2 and 10

Recording channels 1 and 2

* = Connected to the ground
of the amplifier. The signal
ground is used as the
reference for the following
filter amplifier.

2-Channel Miniature Preamplifier Outputs

2-Channel Miniature Preamplifier Inputs

The 2-Channel Miniature Preamplifier MPA2I is connected to the microelectrodes for providing the initial
tenfold amplification stage. It has additional common ground and reference electrode inputs. The reference
electrode is ideally identical to the recording electrodes and placed into a comparable but inactive area or
tissue. Background or noise signals that are picked up by both the reference electrode and the recording
electrodes are removed.
The metal case provides electrical shielding. Electrode damage is prevented by the very low bias current.
The high input impedance ensures stable long-term recordings: Ideally, the input impedance would be infinite.
As low voltages are generally recorded, a high current would flow if the input impedance were low. As a result,
the amplifier would not be able to deliver the current, and the voltage would break down. The miniature
preamplifier has a high input impedance to avoid this problem.