Triggering / Digital Input Does Not Work; Noise On Single Electrodes - Multi Channel Systems MEA2100-Mini-System Manual

Triggering / Digital Input does not Work

You have connected a TTL source to one of the digital inputs of the interface board, and configured
the virtual rack in Multi channel Experimenter for triggering displays or data acquisition by the TTL
source, but you do not see any sweeps.
Possible causes:
? The TTL source does not generate true TTL signals (> 2 to 5 V TTL level), or the TTL pulse duration
is too short in combination with the sampling rate, so that the pulse is missed in-between two data
points.
The MEA2100-Mini-System can only accept TTL signals as a digital input stream. The TTL pulse needs
to be optimized according to the sampling rate. Otherwise, a detection of the trigger cannot be
guaranteed.
? The software settings for the Digital Event Detector do not match with the hardware configuration.
In Multi Channel Experimenter, add a Digital Event Detector to your virtual rack. Please see the Multi
Channel Experimenter help or manual for more details.

Noise on Single Electrodes

The noise level on single electrodes is significantly higher than expected or you see artifact signals.
Possible causes:
? The electrode or the contact pin of the headstage may be defective. To test this, do the following.
Open the MEA2100-Mini headstage and turn the MEA by 90 degrees. Close the headstage again
and start the recording.
If the same electrode in the MEA layout is affected, the amplifier's contact is not okay. If another
electrode is now affected and the previously affected electrode is all right now, the MEA electrode
is not okay, but the headstage is fine.
— OR —
Use the test model probe to test the MEA2100-Mini headstage. If the noise level is fine without
the MEA, bad MEA electrodes cannot be the cause.
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