Specifications

Welcome to MEA-Systems
13
7. Optional: Connect digital (TTL) input sources to the BNC connectors labeled Digital IN (Bits 0, 1, 2).
If you have only one instrument for triggering recording (for example the Sync Out of a stimulus
generator), connect it to bit 0. In MC_Rack, add a Trigger Detector to your virtual rack, and select
the Digital Data D1 input stream as the Trigger. Select the appropriate logical state (generally
HIGH) for triggering. Mask all unused bits. The standard settings of the Trigger Detector are for
using bit 0.
8.
Optional: If you have a digital in / out extension, you can connect up to 16 digital input sources
and up to 16 devices that you want to be triggered by the Digital Output instrument of MC_Rack.
2.6 Supply Power and Recommended Setups
In the standard MEA-System, the isolated power supply IPS10W that is preinstalled on the data
acquisition computer delivers the power for the amplifiers, distributed via the 68-pin MCS high
grade cable. One of the limiting factors when using the IPS10W is the voltage drop of the 3 m
MCS high grade cable. The characteristic resistance of the cable is 0.3 Ohms per meter. This results
in a 1 Ohm resistance for a 3 m cable, leading to a voltage drop of 500 mV for a 500 mA current
(U = R * I = 1  * 500 mA = 500 mV). As the voltage drop limit is 500 mV, the limit for each cable is
± 500 mA, that equals 1 MEA amplifier with blanking circuit.
Warning: Follow the manufacturer’s setup recommendations. Do not use longer cables than
recommended. Do not connect other amplifiers or more amplifiers than recommended. A voltage
drop exceeding the limit of ± 500 mA can lead to improper behavior of the amplifier, or can even
melt the wire!
The following tables show you how much power the amplifiers need, and how much power the
MCS power supplies will provide.
MEA1060-INV MEA1060-UP MEA1060-INV-
BC
MEA1060-UP-
BC
Supply voltage
± 6 VDC to ± 9 VDC ± 6.5 VDC to ± 9 VDC
Supply current
max. 220 mA, typically ± 150 mA ± 550 mA
IPS10W (internal power supply) PS40W (external power supply)
Output voltage
±6.3 V ± 10% ±7 V ± 10%
Output current
max. 1.2 A @ + 6.3 V or – 6.3 V max. 2.5 A @ ±7 V
The following table shows the recommended setups regarding the power supplies that are
needed for operating these Systems. It is necessary to use an external power supply for operating
a MEA Switch (MEAS2to1 or MEAS4to2).
MEA1060-
INV/UP
MEA1060-
INV/UP-BC
MEAS2/1 MEAS4/2 IPS10W PS40W MEA-System
1
1
60
1
1
60
2
1
120
2
2
120
2 1
1
60
2 1
1
60
4 1
1
120
4 1
1
120