Multichannel Systems USB-ME64-128-256-Systems Manual - Manual (Page 23)

Troubleshooting
19
5.4 External Power Supply
The external power supply PS40W is used for all USB-ME-Systems.
External power supply through: Plug in for the external power supply, for example, PS40W. The
external power supply energizes the devices that are connected to the USB-ME256, for example,
filter amplifier, gain amplifier or MEA amplifier with blanking circuit. The conductive path from
the three pins of the plug in runs through the device to the front 68-pin MCS Standard connector
and occupies Pin Number 1, 67 and 68. (Please see also chapter "Pin layout" 68-pin MCS standard
connector in the Appendix).
The PS40W is a standard power supply delivering supply voltages to connected devices. The PS40W
is especially recommended for use with Multi Channel Systems products, for example, it is perfect
for supplying power to MEA1060BC or to programmable gain amplifiers PGA and for other
custom setups that lack an internal power supply IPS10W. It supplies power with +/- 7 V output
voltage, 2.5 A output current, and about 40 W output power. The PS40W stabilizes two voltages
using the linear regulation technique. The outputs of the device have over-current and over-
temperature protection. In case of a failure of the PS40W, the output voltages are decreased.
Fuses protect the electronic components against fatal damages.
If you connect four MEA1060 amplifiers from Multi Channel Systems MCS GmbH to the USB-
ME256, that means maximum load, it will be necessary to use the strong power supply PS40W
with +/- 7 V to generate about 40 W output power. Otherwise the following amplifiers will not
be sufficiently supported.
Important: Do not mismatch the polarity of the power supply. A false connection may cause
permanent damages.
Note: If by any cause the supply voltages are reduced, the recorded signals could be deformed.
Please do not place the external power supply device PS40W near to the data acquisition
device in experimental setup! The PS40W will disturb the data acquisition with 50 Hz hum,
that is why the PS40W should be placed in a distance to the data acquisition device.
Cabling
For Digital Out D0, and Analog Input A1 to A4 on the rear panel of the device you need the same
special coaxial cable as for the Digital Trigger In plugs on the front panel: Lemo cable with one
head BNC connector, the other head "Lemo" connector. Please see the picture below. Sync In
and Sync Out need Lemo cable with two Lemo connectors.