The ETH-256 is a high performance general-purpose life science research amplifier. Its high input impedance and high CMR allows low noise recording of biopotential signals, as well as outputs from strain gauge type transducers, such as force, displacement and pressure. The optional C-ISO-256 isolated head stage may be used with the ETH-256 for recording ECG, EMG and EEG signals from humans.

Each channel can provide +/-5.0V of excitation at 50 mA, adequate for most commonly used transducers. In addition, customers may specify adapter cables to accommodate Grass, Gould or HP sensors.

The ETH-256 offers eight gain settings, x1, x5, x10, x50, x100, x500, x1k and x5k. Signals may be further conditioned using high and low pass frequency filters. All filters are four pole active design with sharp roll offs. High pass filter cuts, useful for biopotential measurements, are available at DC, 0.03 Hz, 0.3 Hz and 3 Hz. Low pass filters, useful for limiting high frequency noise, are available at 5 Hz, 50 Hz, 150 Hz, 2 kHz and 10 kHz.

Either of the ETH-256 amplifier’s channels may be configured as a bridge-style transducer amplifier or as a biopotential amplifier. In bridge mode the ETH-256 amplifier’s 10 gigOhm input impedance and differential input allow it to accept input from force, displacement or pressure transducers. In addition, input from many thermistors, pH electrodes and other variable resistance devices is possible. In the biopotential mode, the ETH-256 functions as a low noise AC coupled preamplifier.