HP 10780A Operating And Service Manual

Model 10780AInstallation and Operation2-22-10. One 10780A Receiver package is required for each measurement axis in the Laser Transducer systembeing installed. Figure 2-1 shows the required optic components, and the alignment of the receiver tothese optics, required for each measurement axis.Figure 2-1. Basic Measurement System2-11. Specific details for the placement of the receiver and its associated optics and installation examplescan be found in the Laser Transducer System Operating Manual. Also a detailed alignment procedure canbe found in the system operating manual.2-12. Briefly, each axis of the Laser Transducer System has a receiver with a lens photodiode assembly in thefront. It must be positioned so that the polarizing vectors of the laser beam are parallel or perpendicular tothe line defined by the two mounting holes (within +3 ) as shown in Figure 2-1.2-13. When mounting the receiver, the following points are important to remember :• At a 45° position , the signal will go to zero.• The receiver dissipates between 2 and 2.7 watts. Plastic pads keep an air gap around the receiver andalso act as thermal and electrical isolators.• The cable to connect to the back connector of the receiver, must have ample room to makeconnection . (See dimensional drawing Figure 2-28 in the 5501A System Operating and ServiceManual ).CAUTIONThe receiver housing must be electrically isolated from the equipment that it is tobe mounted on. Use nylon screws only.2-14. CABLING2-15. For cable preparation , connectors , and part numbers , refer to Appendix C of the 5501A SystemOperating and Service Manual.