KEI2002_902_01B 电路图.pdf

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1、 Model 2002 Multimeter Repair Manual Contains Servicing Information RadioFans.CN 收音机爱 好者资料库 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 3 years from date of shipment. Keithley Instruments, Inc. warrants the following i

2、tems for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation. During the warranty period, we will, at our option, either repair or replace any product that proves to be defective. To exercise this warranty, write or call your local Keithley represe

3、ntative, or contact Keithley headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products

4、 are warranted for the balance of the origi- nal warranty period, or at least 90 days. LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modifi cation without Keithleys express written consent, or misuse of any product or part. This warranty also does not apply to

5、 fuses, software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow instructions. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE

6、. THE REMEDIES PROVIDED HEREIN ARE BUYERS SOLE AND EXCLUSIVE REMEDIES. NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDI- RECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUME

7、NTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY. Keithley Instruments, Inc. 28775 Aurora Road Cleve

8、land, OH 44139 440-248-0400 Fax: 440-248-6168 CHINA:Keithley Instruments China Yuan Chen Xin Building, Room 705 12 Yumin Road, Dewai, Madian Beijing 100029 8610-62022886 Fax: 8610-62022892 FRANCE:Keithley Instruments SARL BP 60 3 Alle des Garays 91122 Palaiseau Cdex 33-1-60-11-51-55 Fax: 33-1-60-11-

9、77-26 GERMANY:Keithley Instruments GmbH Landsberger Strasse 65 D-82110 Germering, Munich 49-89-8493070 Fax: 49-89-84930759 GREAT BRITAIN:Keithley Instruments, Ltd. The Minster 58 Portman Road Reading, Berkshire, England RG3 1EA 44-1189-596469 Fax: 44-1189-575666 ITALY:Keithley Instruments SRL Viale

10、S. Gimignano 38 20146 Milano 39-2-48303008 Fax: 39-2-48302274 NETHERLANDS:Keithley Instruments BV Avelingen West 49 4202 MS Gorinchem 31-(0)183-635333 Fax: 31-(0)183-630821 SWITZERLAND:Keithley Instruments SA Kriesbachstrasse 4 8600 Dbendorf 41-1-8219444 Fax: 41-1-8203081 TAIWAN:Keithley Instruments

11、 Taiwan 1FL., 85 Po Ai Street Hsinchu, Taiwan 886-3-572-9077 Fax: 886-3-572-9031 RadioFans.CN 收音机爱 好者资料库 Model 2002 Multimeter Repair Manual 1995, Keithley Instruments, Inc. Test Instrumentation Group All rights reserved. Cleveland, Ohio, U.S.A. Second Printing June 1998 Document Number: 2002-902-01

12、 Rev. B RadioFans.CN 收音机爱 好者资料库 Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The Revision Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are released between Revi- s

13、ions, contain important change information that the user should incorporate immediately into the manual. Addenda are num- bered sequentially. When a new Revision is created, all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual. Each new

14、 Revision includes a revised copy of this print history page. Revision A (Document Number 2002-902-01).April 1995 Addendum A (Document Number 2002-902-02).October 1995 Revision B (Document Number 2002-902-01).June 1998 All Keithley product names are trademarks or registered trademarks of Keithley In

15、struments, Inc. Other brand and product names are trademarks or registered trademarks of their respective holders. Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation. Although some in- struments and accessories would no

16、rmally be used with non-haz- ardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by qualifi ed personnel who recog- nize shock hazards and are familiar with the safety precautions re- quired to avoid possible injury. Read the operating in

17、formation carefully before using the product. The types of product users are: Responsible body is the individual or group responsible for the use and maintenance of equipment, and for ensuring that operators are adequately trained. Operators use the product for its intended function. They must be tr

18、ained in electrical safety procedures and proper use of the instru- ment. They must be protected from electric shock and contact with hazardous live circuits. Maintenance personnel perform routine procedures on the product to keep it operating, for example, setting the line voltage or replac- ing co

19、nsumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if the operator may per- form them. Otherwise, they should be performed only by service personnel. Service personnel are trained to work on live circuits, and perform safe installations and repair

20、s of products. Only properly trained ser- vice personnel may perform installation and service procedures. Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fi xtures. The American National Standards Institute (ANSI) states that a

21、shock hazard exists when voltage levels greater than 30V RMS, 42.4V peak, or 60VDC are present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring. Users of this product must be protected from electric shock at all times. The responsible bod

22、y must ensure that users are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human contact. Product users in these circumstances must be trained to protect themselves from the risk of electric shock. If the circuit is capable of

23、operating at or above 1000 volts, no conductive part of the circuit may be exposed. As described in the International Electrotechnical Commission (IEC) Standard IEC 664, digital multimeter measuring circuits (e.g., Keithley Models 175A, 199, 2000, 2001, 2002, and 2010) measuring circuits are Install

24、ation Category II. All other instru- ments signal terminals are Installation Category I and must not be connected to mains. Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limited sources. NEVER connect switching cards directly to AC m

25、ains. When con- necting sources to switching cards, install protective devices to lim- it fault current and voltage to the card. Before operating an instrument, make sure the line cord is connect- ed to a properly grounded power receptacle. Inspect the connecting cables, test leads, and jumpers for

26、possible wear, cracks, or breaks before each use. For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting cab

27、les or jump- ers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers. Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth) ground. Always make measurements with dry hands w

28、hile standing on a dry, insulated surface capable of withstanding the voltage being measured. Do not exceed the maximum signal levels of the instruments and ac- cessories, as defi ned in the specifi cations and operating informa- tion, and as shown on the instrument or test fi xture panels, or switc

29、hing card. When fuses are used in a product, replace with same type and rating for continued protection against fi re hazard. Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections. If you are using a test fi xture, keep the lid clo

30、sed while power is ap- plied to the device under test. Safe operation requires the use of a lid interlock. If a screw is present, connect it to safety earth ground using the wire recommended in the user documentation. The symbol on an instrument indicates that the user should re- fer to the operatin

31、g instructions located in the manual. The symbol on an instrument shows that it can source or mea- sure 1000 volts or more, including the combined effect of normal and common mode voltages. Use standard safety precautions to avoid personal contact with these voltages. The WARNING heading in a manual

32、 explains dangers that might result in personal injury or death. Always read the associated infor- mation very carefully before performing the indicated procedure. The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage may invalidate the warranty. Instrumentat

33、ion and accessories shall not be connected to humans. Before performing any maintenance, disconnect the line cord and all test cables. To maintain protection from electric shock and fi re, replacement components in mains circuits, including the power transformer, test leads, and input jacks, must be

34、 purchased from Keithley Instru- ments. Standard fuses, with applicable national safety approvals, may be used if the rating and type are the same. Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component. (Note that

35、se- lected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product.) If you are unsure about the applicability of a replacement component, call a Keithley Instruments offi ce for information. To clean the instrument, use a damp cloth or mild,

36、 water based cleaner. Clean the exterior of the instrument only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. ! i 1Routine Maintenance 1.1Introduction.1-1 1.2Line fuse replacement.1-1 1.3Current fuse replacement.1-2 1.3.1Front AMPS input fuse.

37、1-2 1.3.2Rear AMPS input fuse .1-3 1.4Fan filter cleaning .1-3 1.5Firmware updates.1-3 2Troubleshooting 2.1Introduction .2-1 2.2Repair considerations.2-2 2.3Power-on test.2-2 2.4Front panel tests.2-2 2.4.1KEYS test.2-2 2.4.2DISPLAY PATTERNS Test.2-2 2.4.3Character set test.2-3 2.5Diagnostics.2-3 2.6Control register bit patterns.2-3 2.6.1Control register ICs.2-3 2.6.2Normal operation bit patterns .2-3 2.7Display board checks.2-5 2.8Power supply checks.2-5 2.9Principles of operation.2-6 2.9.1Block diagrams .2-6 2.9.2Display board circuit theory.2-11 2.9.3Power supply circuit theory .