Optical chopper MC2000, MC2000-EC

Features Crystal-Stabilized, Phase-Locked Feedback Loop Suppresses Low Frequency Drift and Phase Jitter Harmonic, Subharmonic, and Fractional Harmonic Chopping with Sum and Difference Reference Outputs Microprocessor Controlled 2-Frequency Blades Available for Pump-Probe and Other Nonlinear Experiments Save and Recall User Setups in Non-Volatile RAM USB Interface The MC2000 Optical Chopper, utilizing advanced features to meet the most demanding applications, is a rotary chopper that is composed of a control console, motor head assembly and slotted chopper wheel. The MC2000 uses a phase-locked loop (PLL) motor speed control design to precisely maintain the chopping speed and phase relative to a reference signal. An internal, crystal-stabilized, frequency synthesizer provides an accurate and stable reference frequency for stable long-term performance. Unlike conventional, open-loop speed control designs, the PLL speed control circuit also allows the MC2000 chopper to be synchronized to external reference signals, including other MC2000 choppers and reference sources such as DSP lock-in amplifiers. Please see the Operations tab for more details on the MC2000 chopper and its applications. The MC2000 design features a high quality, rare earth magnet, DC motor and a photo-etched optical chopper wheel for high precision. The compact optical head has a wide base for extra stability. The base is slotted for two 1/4"-20 mounting screws on 2" centers. The interface cable uses circular snap-on LIMO connectors for easy setup.