4mmto 13 ח 13 mm. These new Models 293X position-sensitivedetectors (PSDs) deliver exceptional perfor- mance with a range of convenient features. With <0.25-m resolution, <ձ15-m accuracy,and 16-bit digital output resolution, thesedetectors are ideal for beam position, pointing and power measurements. Unlike our quad- rant-cell photoreceivers, which are ideal for centering applications, these PSDs are well- suited for applications requiring varying beam positions or angles. (See the inset ՓPSDs vs. Quadrant-Cell Photoreceivers for more infor- mation.) Three versions with different photode- tector sizes are available for varying beam sizes or beam position deviations from 4 These easy-to-use PSDs include both digitaland analog outputs. The digital outputs use a USB 2.0 interface for easy interfacing with your computer. The analog outputs can bemanually switched between raw X, Y and SUM(i.e. power) or normalized X/SUM, Y/SUM and SUM. To further improve precision, the normal- ized output features a background (ambient light) subtraction function. These PSDs also include adjustable gain settings for use with a wide variety of optical powers. > Models 293X