Test-4 is a valuable tool for calibration sessions, laboratory tests and simulation of analog measurements controlled by industrial devices (PLCs, controllers, data acquisition systems, etc ). With an overall accuracy of less than 0.1%, a resolution of one A and one mV, Test-4 ensures the best calibration results. It allows simulation of ramps in both tension and current (active or passive).Test-4 can be powered with 220 Vac power supply or through 2-NiMH batteries that provide an average range of 20 hours.