Beam Alignment - HP 5501A Operating And Service Manual

Model 5501A
Installation and Operation
2-23. If a delay exists between application of the +15 Vdc and -15 Vdc power, it is preferable to apply +15
Vdc after the -15 Vdc. This provides automatic retune of the laser head upon power turn-on. If +15 Vdc is
applied first, the retune cycle is initiated by either manually depressing the RETUNE switch (at the rearof the
laser head) or applying a logic low RETUNE CMD signal to pin E of the DIAGNOSTIC connector.
2-24. After power is applied, the POWER ON and RETUNE lamps at the rear of the laser head will remain
on. After 9 seconds the RETUNE lamp goes out and only the POWER O N lamp remains lit.
2-25.
Beam Alignment
2-26. Rotate the turret at the front of the laser head so that the beam exits through the large aperture. DO
NOT STARE DIRECTLY INTO THE BEAM APERTURE. Presence of the red laser beam can be verified by
placing a piece of paper in the beam path and observing the beam reflection on the paper. The components
of the laser transducer system must now be aligned so that the laser beam strikes the photodetector of the
receiver (HP Model 10780A). Refer to the documentation supplied with the receiver and to the Laser
Transducer System Manual for further alignment information.