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6033A


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                                        SERVICE MANUAL

                                  AUTORANGING
                            SYSTEM DC POWER SUPPLY
                          AGILENT MODELS 6033A and 6038A



                             FOR INSTRUMENTS WITH SERIAL NUMBERS

                          Agilent Model 6033A; Serials US38320231 and above

                          Agilent Model 6038A; Serials US38310401 and above




                   For instruments with higher serial numbers, a change page may be included.




Agilent Part No. 5959-3346
                                        5                                                  Printed in USA
Microfiche Part No. 5959-3347                                                              September, 2000
                                                   CERTIFICATION
Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent
Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of
Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International
Standards Organization members.

                                                      WARRANTY
This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three
years from date of delivery. Agilent Technologies software and firmware products, which are designated by Agilent
Technologies for use with a hardware product and when properly installed on that hardware product, are warranted not to
fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date
of delivery. During the warranty period Agilent Technologies will, at its option, either repair or replace products which
prove to be defective. Agilent Technologies does not warrant that the operation of the software, firmware, or hardware shall
be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility designated
by Agilent Technologies. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned
to Agilent Technologies for warranty service. Except for products returned to Customer from another country, Agilent
Technologies shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent Technologies product price, only if
Customer pays Agilent Technologies international prices (defined as destination local currency price, or U.S. or Geneva
Export price).

If Agilent Technologies is unable, within a reasonable time to repair or replace any product to condition as warranted, the
Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent.Technologies.

                                           LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer,
Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental
specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED
OR IMPLIED. AGILENT TECHNOLOGIES. SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

                                              EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. AGILENT
TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

                                                     ASSISTANCE
The above statements apply only to the standard product warranty. Warranty options, extended support contracts, product
maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent
Technologies Sales and Service office for further information on Agilent Technologies' full line of Support Programs.




2
                                                     SAFETY SUMMARY
The following general safety precautions must be observed during all phases of operation, service and repair of this
instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety
standards of design, manufacture, and intended use of the instrument. Agilent Technologies, Inc. assumes no liability for
the customer's failure to comply with these requirements.

BEFORE APPLYING POWER.
Verify that the product is set to match the available line voltage and the correct fuse is installed.

GROUND THE INSTRUMENT.
This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis
and cabinet must be connected to an electrical ground. The instrument must be connected to the ac power supply mains through a three-
conductor power cable, with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. For instruments
designed to be hard wired to the ac power lines (supply mains), connect the protective earth terminal to a protective conductor before any
other connection is made. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will
cause a potential shock hazard that could result in personal injury. If the instrument is to be energized via an external autotransformer for
voltage reduction, be certain that the autotransformer common terminal is connected to the neutral (earth pole) of the ac power lines
(supply mains).

FUSES
Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used. Do not use
repaired fuses or short circuited fuseholders. To do so could cause a shock or fire hazard.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.
Do not operate the instrument in the presence of flammable gases or fumes.

KEEP AWAY FROM LIVE CIRCUITS.
Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified
service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even
with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before
touching components.

DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

DO NOT EXCEED INPUT RATINGS.
This instrument may be equipped with a line filter to reduce electromagnetic interference and must be connected to a properly grounded
receptacle to minimize electric shock hazard. Operation at the line voltage or frequencies in excess of those stated on the data plate may
cause leakage currents in excess of 5.0mA peak.

SAFETY SYMBOLS.
         Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the
         instruction manual (refer to Table of Contents) .

               Indicates hazardous voltages.

               Indicate earth (ground) terminal.

                     The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly
                     performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the
                     indicated conditions are fully understood and met.

                     The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly
                     performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed
                     beyond a CAUTION sign until the indicated conditions are fully understood and met.

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the
instrument. Return the instrument to an Agilent Technologies, Inc. Sales and Service Office for service and repair to ensure that safety
features are maintained.
Instruments which appear damaged or defective should be made inoperative and secured against unintended operation until they can be
repaired by qualified service personnel.



                                                                                                                                            3
                                          Safety Symbol Definitions
    Symbol                  Description                  Symbol                         Description
             Direct current                                          Terminal for Line conductor on permanently
                                                                     installed equipment
             Alternating current                                     Caution, risk of electric shock


             Both direct and alternating current                     Caution, hot surface


             Three-phase alternating current                         Caution (refer to accompanying documents)


             Earth (ground) terminal                                 In position of a bi-stable push control


             Protective earth (ground) terminal                      Out position of a bi-stable push control
             (Intended for connection to external
             protective conductor.)
             Frame or chassis terminal                               On (supply)


             Terminal for Neutral conductor on                       Off (supply)
             permanently installed equipment
             Terminal is at earth potential                          Standby (supply)
             (Used for measurement and control                       Units with this symbol are not completely
             circuits designed to be operated with                   disconnected from ac mains when this switch is
             one terminal at earth potential.)                       off. To completely disconnect the unit from ac
                                                                     mains, either disconnect the power cord or have
                                                                     a qualified electrician install an external switch.

Printing History

The edition and current revision of this manual are indicated below. Reprints of this manual containing minor corrections
and updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition
incorporates all new or corrected material since the previous printing date. Changes to the manual occurring between
revisions are covered by change sheets shipped with the manual. Also, if the serial number prefix of your power supply is
higher than those listed on the title page of this manual, then it may or may not include a change sheet. That is because even
though the higher serial number prefix indicates a design change, the change may not affect the content of the manual.

Edition 1    February, 1991
Edition2     September, 2000




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