Multichannel Systems MPA32I 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
2012 Multi Channel Systems MCS GmbH
Product information is subject to change
without notice.
32-Channel Miniature Preamplifier
32-Channel Miniature Preamplifier
Input Connectors
Pin 1
GND (Ground)
Pin 2
Reference input
Pin 3 to 34 Recording channels 1 to 32
Pin 35
Reference
Pin 36
GND (Ground)
32-Channel Miniature Preamplifier 37-Pin D-Sub Output Connector
Pin 1 and Pin 18 GND (Power Ground)
Pin 20
GNDS (Signal Ground)*
Pin 37
Positive supply voltage
Pin 19
Negative supply voltage
Pin
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
Recording channel
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31
Pin
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36
Recording Channel
2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32
* = Connected to the
ground of the amplifier.
The signal ground is used
as the reference for the
following filter amplifier.
32-Channel Miniature Preamplifier Outputs
The 32-channel Miniature Preamplifier MPA32I 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.
3
18
37
4
17
2
35
5
19
20
21
36
23
22
1
15
16
34
33
24
32-Channel Miniature Preamplifier Inputs
The MPA32I is optimized for the use
with flexible microelectrode arrays
(FlexMEA36 or FlexMEA72) from
Multi Channel Systems MCS GmbH.
For connecting FlexMEAs or NeuroNexus
probes special adapters are available,
for example, ADPT-NN-36 or ADPT-NN-72.
This illustration shows the pin layout viewed from the front,
with the case screws down.
5
13
7
11
3
9
15
1
21
29
23
27
19
25
31
17
2
10
4
8
35
6
12
33
18
26
20
24
16
22
28
14
34
32
30
36