The DS4 takes an analogue voltage waveform defined within your own data acquisition/ control system and converts it into an isolated constant current stimulus. The DS4 will accept several input voltage ranges and produces four output ranges (±10µA, ±100µA, ±1mA and ±10mA). It also features a GATE input, so that several DS4 units can be controlled by a single analog waveform, but enabled individually via this GATE input. A timed "inactivity sensor" reduces battery usage and damaging "leak currents" during infrequent stimulation, while at the same time maintaining low levels of zero crossing distortion for repetitive waveforms.
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Download a brochure at http://www.autom8.com/pdfs/amplifiers/DS2a-DS3-stimulator.pdf