Multichannel Systems USB-MEA32-STIM4 Manual - Manual (Page 40)

USB-MEA32-STIM4 Manual
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6.3 No Computer Connection / No Recording Possible
Problem: You cannot establish a connection to the computer. USB-MEA32-STIM4 is not available
in MC_Rack. When loading a previously saved virtual rack file, you will get an error message and
the simulation mode will be started automatically. Or you get an error message when starting
the recording in MC_Rack after a successful computer connection.
Possible causes:
? The supply power is not connected or there is a technical problem with the device.
Check the power source and the cable connections. If this does not solve the problem,
contact your local retailer for support.
? The USB port might not support USB 2.0 or might not be working.
Check the USB port. Only high speed USB 2.0 ports can be used. Try another USB 2.0 port.
? You can establish a connection, but get an error message when starting the recording in
MC_Rack. The bandwidth of the USB port is not sufficient for recording. This can be the case
if the USB-MEA32-STIM4 is connected via USB hub, and a second device that sends or receives
continuous data streams, for example, a web cam or USB speakers, is connected to the same
USB port.
Connect the USB-MEA32-STIM4 device directly to a USB port, not via hub.
6.4 MEA is defective
Perforated MEAs wear out after multiple uses. This is considered a normal behavior. pMEAs
are also easily damaged by mishandling, for example, if wrong cleaning solutions or too severe
cleaning methods are used or if the recording area is touched. If you observe a bad long-term
performance of pMEAs, consider a more careful handling. Also do not apply too high/too long
stimuli. This might lead to electrolysis and destruction of the electrodes.
Problem: The noise level on individual electrodes is significantly higher than expected or you
see artifact signals. In the following example electrode number 13 shows a high noise level.
Possible causes:
? The contact pads are contaminated.
Clean the contact pads carefully with a swab or a soft tissue and pure (100 %) alcohol.
? The contact pads or the electrodes are irreversibly damaged. You could have a look at the
electrodes under a microscope: If they appear shiny golden, the TiN is gone and the electrode
is irreversibly damaged. Electrodes may be damaged without changing their visual appearance,
though.
If too many electrodes are defective, use a new pMEA.