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Model 5501A
General Information
SECTION I
GENERAL INFORMATION
1-1. INTRODUCTION
1-2. This section of the manual provides a description of the HP 5501A Laser Transducer, hereafter called
the laser head. Information regarding identification of the manual, the laser head, and circuit boards within
the unit, a s well as a list of available accessories (Table 1-I), general applications information, and complete
specifications (Table 1-2), is also included.
1-3. EQUIPMENT DESCRIPTION
1-4. The laser head (Figure 1-1) is a high stability laser source that generates a coherent light beam to a
receiver through the system optics. The laser head also generates an electrical reference signal R E F which is
compared with the received electrical signal MEAS (from a 10780A Receiver) to provide displacement
information.
1-5. As an additional feature, the laser head providesvisual and electrical diagnostic outputs that indicate
its operational status. Remotely activated tuning can be performed via the diagnostic circuits.
1-6. The laser head consists of three printed-circuit boards, two sealed modules, a laser tube, and internal
optics mounted in a NEMA type 12 enclosure. These components maintain optimum laser beamoperation,
as well a s provide continuous laser reference and status information.
1-7. IDENTIFICATION
1-8. This manual i s identified on the title page by equipment description and nomenclature, manual part
number, and publication data. Refer to information presented in the following paragraphs and ensure that
this manual applies to equipment being serviced.
1-9. Hewlett-Packard instruments have a two-section, nine-digit plus one-letter serial number usually
attached to the instrument rear panel.
the four-digit
prefix (firstfour digits form the left) identifies agroup of
instruments. The letter indicates the assembly plant location. The five-digit serial number is different for
each instrument. If theserial prefix of your instrument differsfrom that listed on the title pageof this manual,
there are differences between this manual and your instrument.
1-10. The printed-circuit boards within the instrument are identified by a two-section, 10-digit part
number (e.g., 05501-60001) and a four-digit series number (e.g., "SERIES 1404"). The series number
identifies the electrical characteristics of the complete printed-circuit assembly. A replacement circuit-
board assembly may have a different series number than the assembly originally supplied with the
instrument. Therefore, when troubleshooting a circuit-board assembly, ensure that the series number on
the schematic diagram matches the series number on the board assembly. If the series number on the
assembly is lower than the number on theschematicdiagram in Section VII, refer tosection VI of this manual
for change information. If the series number on the assembly is higher than the number on the schematic
diagram, the change information is provided in a manual change sheet which i s available from the nearest
Hewlett-Packard Sales and Service Office.
1-11. EQUIPMENT SUPPLIED
1-12. Three plugs that mate with the laser head rear-panel jacks are included with the laser head. System
interconnection of the laser head is accomplished by fabricating suitable cables that terminate with these
plugs. Refer to Section II of this manual for cable fabricating instructions.
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