The LDX-3500 Series Laser Diode Current Sources is a low-cost microprocessor-based precision instrument specifically designed to control low to high power laser diodes. It provides a low noise, high-stability current output for precise control of laser diodes, so measurements in development or production can be made with confidence. The LDX-3500 Series has dual current ranges of 200/500 mA. In addition to precision current control, it is loaded with standard features including PD current measurement for constant power control, analog modulation for power and wavelength tuning, and an analog output for remote monitoring.