IA-400D vs ETH-256VS
The IA-400D is the optimal solution for most recording requirements. It is a 4 Channel general purpose recorder designed for measuring signals from transducers as well as Biopotentials using the C-ISO-256 The ETH-256 is a 2 channel amplifier with selectable gain and filters, for measuring signals from transducers as well as biopotentials. For isolated signals, such as human biopotentials, the C-ISO-256 is required.
An amplifier is used to set the Gain and Filter for a sensor.