When the amplified signal for any given channel exceeds the range -10 to +10 volts, the signal will rail. You will see a straight line at -10 or + 10 volts (more likely the reading will be close 9.99 volts). The MP system is designed to work only in the range -10 to +10 volts. The signal could rail for several reasons (which are not exclusive):
The signal is too strong for the current gain setting on the amplifier. Try reducing the gain setting.
You are recording in DC mode when you should be recording in AC mode. If this is the case, make sure DC is off and a switch is set to 0.05Hz HP or 0.5Hz HP.
Your amplifier baseline (offset) is not adjusted properly. Please consult with application note 110 for details on how to make the required adjustments.
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