HP 5501A Service manual

OPERATING AND SERVICE MANUAL
5501A
LASER TRANSDUCER (LASER HEAD)
SERIAL PREFIX: 1736A
This manual appliesdirectly to Hewlett-Packard Model5501A
Laser Transducers having serial prefix 1736A.
SERIAL PREFIXES NOTLISTED
For serial prefixes above 1736A, a Manual Change sheet is
included with this manual. For lower serial prefixes, refer to
Section
VI of this manual.
Copyright HEWLETT-PACKARD COMPANY 1975
5301 STEVENS CREEK BLVD., SANTA CLARA, CALIF. 95050
Printed: MAY 1979

SAFETY
This product has been designedandtestedaccordingto InternationalSafetyRequirements.To ensuresafe
operation and to keep the product safe, the information, cautions, and warnings in this manualmust be
heeded. Refer to Section
7 for general safety considerations applicable to this product.
CERTIFICATION
Hewlett-PackardCompany certifies that this product met its publishedspecificationsat the time ofship-
ment from the factory. Hewlett-Packardfurther certifies that its calibration measurements are traceable
tothe UnitedStates NationalBureauofStandards, totheextentallowedbythe Bureau's calibration facility,
and to the calibration facilities of other InternationalStandards Organization members.
WARRANTY
This Hewlett-Packard product is warranted against defects in materialsand workmanship for a period of
90 days from date of shipment, except that in the case of certain components listed in Section 1 of this
manual, this warranty shall be for the specifiedperiod. Duringthe warranty period, HP will, at its option,
either repair or replace products which prove to
be defective.
Warranty serviceof this product will beperformedat Buyer's facility at nochargewithin HP servicetravel
areas. Outside HP service travel areas, warranty service will be performed at Buyer's facility only upon
HP's prior agreement and Buyer shall pay HP's round trip travel expenses. Inall other cases, products
must be returned to a service facility designated by HP.
For products returned to HP for warrantyservice, Buyer shall prepayshipping charges toHP and HP shall
pay shipping charges to returnthe productto Buyer. However, Buyershallpay all shippingcharges, duties,
and taxes for products returned to HP from another country.
LIMITATION OFWARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance
by Buyer, Buyer-suppliedsoftwareor interfacing, unauthorized modificationor misuse, operationoutside
of the environmental specifications for the product, or improper site preparation or maintenance.
NO OTHER WARRANTY
IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES. HP SHALL NOT
BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
WHETHER BASED ONCONTRACT, TORT, OR ANY OTHER LEGAL THEORY.
ASSISTANCE
Product maintenance agreements and other customer assistance agreements are available for Hewlett-
Packardproducts.
For any assistance, contactyour nearest Hewlett-PackardSales andService Office. Addresses areprovided
at the back of this manual.

SAFETY PRECAUTIONS
This is a Safety Class I system. This system has been designed and tested according to IEC
Publication
348, "Safety Requirements for Electronic Measuring Apparatus".
LASER RADIATION
DO NOT STARE INTO BEAM
MAXIMUM OUTPUT:
1 mw
PULSE SPEC: continuous wave
LASER MEDIUM: helium neon
CLASS 11 LASER PRODUCT
BEAM CAN BE SHUT
OFF BY CLOSING
BLACK APERTURE
ALIGNMENT
APERTURE FOR
REDUCED BEAM
-1' CAUTION" - Laser radiation
when open and interlock failed
or defeated. DO NOT STARE
INTO BEAM.
This laser product conformsto Federal Bureau of
Regulations 21 CRF 1040.10.

Although this system has been designed in accordance with international safety standards,
this manual contains information, cautions, and warnings which must
be followed toensure
safe operation and toretainthe system insafe condition. Removalof thecoverand
rub!sequent
service or adjustmentsshould be performedonly by qualified service personnel.
L 1
WARNING
HIGH VOLTAGES ARE GENERATED WITHIN THE LASER HOUSING.
THE COVER OF THE MODEL
5500C LASER IS PROVIDED WITH AN
INTERLOCK TO PREVENT ACCIDENTAL ACCESS TO VOLTAGES.
FOR SAFETY, THERE ARE NO HIGH VOLTAGES ON THE INTER-
CONNECTINGCABLE.
t %
CAUTION
Any adjustment, maintenance, and repair of an opened instrument
under voltage should
be avoided as muchas possibleand, when in-
evitable, should
be carriedoutonly by a skilled personwho is aware
of the hazard involved.
Capacitors inside the instruments may still
be charged even if the
instruments have been disconnected from their source of supply.
Whenever
it is likely that the protection has been impaired, the
system must
be made inoperative and be secured against any un-
intendedoperation.
Useof controls or adjustments, or performanceof procedures other
thanthose specifiedherein may resultinhazardousradiationexposure.

LASER TUBE WARRANTY CLAIM
Shipping Instructions
Carefully wrap the tube inIM-inchthick cotton batting or other soft padding material.
Wrap the above in heavy kraft paper.
Pack wrapped tube inarigidcontainer which is at least 4 incheslargerthanthe tube ineach dimension.
Surround the tube with at least 4 inches of packed excelsior or similar shock absorbing material; be
sure the packing
is tight all around the tube.
FROM: DATE
COMPANY
For additional information, contact:
COMPANY
1. HP INSTRUMENT a. MODEL
b. SERIAL No.
2. TUBE SERIAL No.
3. Is defective tube original? YES NO
4. Date purchased (if available)
5.
Describe nature and/or symptoms of trouble
6.
Describe operating environment (i.e., temperature, humidity, etc.)
7. Remarks

Model 5501A
Table of Contents
TABLE OF CONTENTS
Section
I
Title Page
..................................................
GENERAL INFORMATION 1-1
. 1.1 Introduction ...................................................... 1-1
. 1.3 EquipmentDescription ............................................. 1-1
. 1.7 Identification ...................................................... 1-1
. 1.11 EquipmentSupplied ............................................... 1-1
. 1.13 Available Accessories ............................................... 1-2
. 1.15 Specifications ...................................................... 1-3
INSTALLATIONAND OPERATION
........................................... 2-1
2.1
. Introduction ...................................................... 2-1
2.3 . Unpacking and Inspection .......................................... 2-1
2.5 . Packagingfor Reshipment .......................................... 2-1
2.7
. Storage ........................................................... 2-1
2.9
. Installation ........................................................ 2-1
2.11
. Mounting ...................................................... 2-2
2.13
. Power and Signal Connections ................................... 2-2
2.15 . Cable Fabrication ............................................... 2-3
.........................................................
2.17 . Operation 2-3
2-1 9
. Controls, Connectors, and Indicators .............................. 2-3
2.21
. Power Application .............................................. 2-3
2.25
. Beam Alignment ................................................ 2-7
THEORY OF OPERATION
................................................... 3-1
3.1
. Introduction ...................................................... 3-1
...............................................
3.3 . General Description 3-1
3.15
. General Functional Description ..................................... 3-2
3.17
. Power Distribution ............................................... 3-2
.........................................
3.21 . Laser Current Regulation 3-3
...........................................
3.25 . Automatic PZT Tuning 3-3
...............................
3.34 . Control and Diagnostic Monitoring 3-4
MAINTENANCE
............................................................ 4-1
4.1
. Introduction ...................................................... 4-1
4.3
. Performancecheck ................................................ 4-1
4.6
. Instrument Access ................................................. 4-2
...................................................
.
4.15 Troubleshooting 4-4
4.17 . Adjustment Procedures ............................................. 4-8
4.19
. Lock Reference Board Adjustments ................................ 4-8
4.26
. Laser Tube Current Adjustment ................................... 4-10
REPLACEABLE PARTS
....................................................... 5-1
5.1
. Introduction ...................................................... 5-1
5-4 . Ordering Information .............................................. 5-1
MANUAL CHANGES AND OPTIONS
......................................... 6-1
6.1
. Introduction ...................................................... 6-1
6.3
. Manual Changes ................................................... 6-1
6.5
. New Instruments ................................................ 6-1
6.7
. Older Instruments ............................................... 6-1
6.9
. Options ........................................................... 6-3
........................................................ CIRCUIT DIAGRAMS 7-1
7.1
. Introduction ......................................................... 7-1

Model 5501A
Tables and Figures
TABLES
Table
Figure
Title Page
Available Accessories ......................................................... 1.2
................................................................
Specifications 1.3
Laser Head System Signal Chart
............................................... 2.5
DC UnbalancedFailures
...................................................... 3.2
lnput Voltage ................................................................ 4.1
Voltages at Diagnostic Connector
.............................................. 4.1
Indicator Conditions During Retune
........................................... 4.2
ReferenceSignal
............................................................. 4.2
ModuleAdjustment Requirements
............................................ 4.8
Replaceable Parts
............................................................ 5.3
......................................................
Manufacturers Code List 5.9
BackdatingChanges
.......................................................... 6-1
Power Supply Options
........................................................ 6.2
....................................................
Laser Head Module Listing 7.7
A1 Connector Board Signal List ................................................ 7.8
A2 High Voltage Assembly Signal List
.......................................... 7.12
........................................... A5 Lock Reference Board Signal List 7.14
A6 PZT Power Supply Assembly Signal List
...................................... 7.16
A7 Control BoardAssembly Signal List
......................................... 7.18
FIGURES
Title Page
Model 5501A Laser Transducer ................................................ 1.0
Mounting Details and Physical Characteristics
.................................. 2.2
Typical Transducer System Interconnections
.................................... 2.3
Interconnecting Plugs and Cable Details
....................................... 2.4
Controls, Connectors, and Indicators
.......................................... 2.7
......................................................
RetuneTiming Diagram 3.5
Troubleshooting Flow Chart
................................................... 4.5
Laser Current Loop FailureAnalysis
............................................ 4.6
....................................... Automatic Retune Loop FailureAnalysis 4.7
................................ A5 Lock Reference Board Adjustment Locations 4.9
................................................. Laser Beam Blocking Method 4.9
Laser Current Adjustment Locations
........................................... 4.11
Schematic Diagram Notes
..................................................... 7.2
IC Diagrams ................................................................. 7-3
Laser Head Assembly Locations
................................................ 7.6
.................................................... FunctionalCircuit Diagram 7.7
A1 Connector BoardComponent Locator ...................................... 7.10
A1 Connector BoardSchematic Diagram ....................................... 7.11
A2 H.V. Power Supply Assembly Schematic Diagram
............................ 7.13
A5 Lock Reference Board Component Locator
.................................. 7.15
A5 Lock Reference BoardSchematic Diagram
.................................. 7.15
.............................
A6 PZT Power Supply Assembly Schematic Diagram 7.17
A7 Control Board Component Locator
......................................... 7.19
A7 Control Board Schematic Diagram
.......................................... 7.19

Model 5501A
General l nformation
Figure
7-7. Model 5507A Laser Transducer
1-0

Model5501A
General Information
SECTION I
GENERAL INFORMATION
1-1. INTRODUCTION
1-2. This section of the manual providesadescription of theHP 5501A Laser Transducer, hereaftercalled
the laser head. Informationregardingidentificationof the manual, the laser head, andcircuitboardswithin
the unit, as well as alistof availableaccessories(Table1-I), generalapplicationsinformation, and complete
specifications (Table1-2),
is also included.
1-3. EQUIPMENT DESCRIPTION
1-4. The laser head (Figure1-1) is a high stability laser source that generates acoherent light beam toa
receiverthroughthe system optics. The laser headalsogeneratesan electricalreferencesignalREF 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 headprovidesvisualand electricaldiagnostic outputsthat indicate
its operational status. Remotely activated tuning can be performed via the diagnostic circuits.
1-6. The laser headconsistsof three printed-circuit boards, twosealed modules, alaser tube, andinternal
opticsmountedinaNEMA type 12enclosure. These componentsmaintainoptimum laser beamoperation,
as well as provide continuous laser reference and status information.
1-7. IDENTIFICATION
1-8. This manual is identified on the title pagebyequipment description and nomenclature,manualpart
number, and publicationdata. Refertoinformation presented inthefollowing paragraphsandensurethat
this manual applies to equipment being serviced.
1-9. Hewlett-Packard instruments have a two-section, nine-digit plus one-letter serial number usually
attachedtotheinstrumentrearpanel.
the four-digit prefix (firstfourdigitsformtheleft)identifiesagroupof
instruments. The letter indicates the assembly plant location. The five-digit serial number
is different for
each instrument.Iftheserial prefixof your instrumentdiffersfromthat listedonthetitlepageofthismanual,
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 characteristicsof the complete printed-circuit assembly.
A replacementcircuit-
board assembly may have a different series number than the assembly originally supplied with the
instrument. Therefore, when troubleshooting acircuit-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 lowerthanthenumberontheschematicdiagraminSectionVII, refertosectionVI ofthismanual
for change information. If the series number onthe assembly
is higher than the numberontheschematic
diagram, the change information
is provided inamanualchangesheet which is availablefromthe nearest
Hewlett-Packard Sales and Service Office.
1-11. EQUIPMENT SUPPLIED
1-12. Three plugsthat mate with the laser head rear-paneljacks are includedwith the laser head. System
interconnection of the laser head
is accomplished by fabricating suitable cables that terminatewith these
plugs. Refer to Section
II of this manual for cable fabricating instructions.

Model 5501A
General l nformation
1-13. AVAILABLE ACCESSORIES
1-14. Table 1-1 lists electrical, mechanical, and optical accessories that are availablefor usewith thelaser
head. Also included are part numbers for cables that are suitable for interconnecting a laser transducer
system.
Table
7-7. Available Accessories
Description
Coupler
Laser Transducer Interface
Laser Transducer Counter
Laser Transducer Counter with Resolution Extension
Extender Board
HP-IB Interface
Binary Interface
Compensation
l nterface
Manual Compensator
Counter
Receiver
Pulse Converter
Service Kit without Laser Assembly
Laser Assembly only
Numeric Display
33% Beam Splitter
50% Beam Splitter
Linear Interferometer
Retroreflector
Retroreflector
Single Beam Interferometer
Plane Mirror Interferometer
Beam Bender
Cable for RF signals,
4 conductors
(bulk, order required length)
Cable for power,
4 conductors
(bulk, order required length)
Cable for diagnostics, 21 conductors
(bulk, order required length)
Adjustable Mount for 10700A, 10701A,
10705A, and 10707A
Adjustable Mountfor 10702A and 10706A
HP Model
or Part Number
10740A
10741A
10742A
10742A
Opt. H01
10743A
10745A
10746A
10755A
10756A
10760A
10780A
10781A
10782A
10782A
Opt. 001
10783A
10700A
10701A
10702A
10703A
10704A
10705A
10706A
10707A
C05-59995A
C07-59995A
(308-59995A
10710A
10711A