Multichannel Systems µPA16+32 Manual - Manual (Page 8)

Micro Preamplifier Manual
4
3 Setting Up and Connecting the μPA
3.1 General Setup Recommendations
In the following, you find general recommendations for the installation.
Important: It is important that the complete setup refers to a single common ground. The reference
input has always to be connected. It is recommended to use a reference electrode. However, if you
are not using a reference electrode, connect the reference input to ground (GND). Otherwise, noise
picked up by the reference input will be subtracted from the recording signals. This will either lead to
signal loss or to a very high noise level.
1. Ground the animal with a ground electrode of large surface area, for example, a liquid gel adhesive
electrode, that is connected to the ground of the setup, for example, a large metal table or a Faraday
cage, to avoid pickup of noise from the environment. The ground electrode is best positioned in an
electrically inactive region not near muscle, nor heart, for example, at the belly.
2. Connect the GND input of the micro preamplifier to the common ground of the setup. The ground
input is internally connected to the metal case of the preamplifier.