•Patented advanced optical position detector providesinstrumentation level accuracy and stability for exceptional closed loop positioning, while being cost effective to suit a wide range of applications.•Our most rugged design — corrosion resistant nickel finishextends lifetime in even the most harsh manufacturing environments.•An extensive range of options and supporting products,giving you a broad selection of configurations to meet your system requirements.•Continuous improvements to the 62XX family; the newH (high torque) line offers twice the speed in small aperture scanning and increased product lifetime from new bearing technology. 6860/6870/6880 Moving Magnet Galvanometer withCapacitive Position Detector •Highest torque available for apertures of 20mm – 50mm,the 6880 galvanometer is recommended for higher speed applications with inertial loads up to 800gm*cm
2 .•Galvanometers 6860 and 6870 are still popular choicesfor some established OEM applications; however, for new applications refer to the 62XXH product line. 68XXP Moving Magnet Galvanometer with Optical Position Detector •Although still popular choices for some established OEMapplications, for new applications refer to the 62XXH series. 6450/6650/6900/6400 Moving Coil Galvanometer with Capacitive Position Detector Galvanometer Accuracy Specification Definitions Most Accurate and Repeatable Product Line SpecificationDefinitionBest CTI PerformanceLinearity Moving coil galvanometers are exclusive to Cambridge Technology and have been used around the globe for over a decade in the most demanding of applications. Their extremely high accuracy is unrivalled in the scanning industry, making them the premium choice when absolute precision is your primary goal.•Ideal for applications where scanning accuracy andrepeatability are most important, or for inertial loads >65gm*cm Position accuracy as a function of the location in the optical field99.9% Step Response Small angle position settling time measured from command start, to the galvo 99% settled position.100 µ sec Short Term Ability to return to the original position, even Repeatability after a full-field move1 microradian Scale Drift Optical position amplitude variation as a function
2 that cannot be supported with movingmagnet galvos.•Patented capacitive front-end position detector providessingle microradian level repeatability for apertures from 10mm to >75mm.•Lowest dither architecture. •Highest torque-to-inertia ratio actuator technology. •Available for larger apertures with inertial loadsup to 50,000gm*cm of temperature50ppm/ ° C Zero Drift Optical position center variation as a function of temperature10 µ rad/ ° C Max. What is 1 Microradian Repeatability? For a focal length of 1 meter, 1 microradianrepeatability equates to 1 micronrepeatability, even after a full field move.
2 . Mirror-Galvo Configuration Strategy One cost-reduction strategy is to use large mirrors on smaller,less expensive galvos. Example: 6220H with 10mm mirror. Step response = 310 µ sec. µ secOne performance improvement strategy is to use alternate mirrorsubstrate materials such as silicon carbide or beryllium. Example: 6240H Galvo with 30mm beryllium mirror. Step response time = 600