KEI 6517A Service 电路图.pdf

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1、 Model 6517A Electrometer Service Manual Contains Performance Verifi cation, Calibration, and Repair Information References to the Model 6517 also apply to the Model 6517A. 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 workm

2、anship for a period of 1 year from date of shipment. Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batter- ies, diskettes, and documentation. During the warranty period, we will, at our option, either repair or replace any

3、 product that proves to be defective. To exercise this warranty, write or call your local Keithley representative, 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 faci

4、lity. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for the balance of the original warranty period, or at least 90 days. LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modifi cation without K

5、eithleys express written consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leak- age, or problems arising from normal wear or failure to follow instructions. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIE

6、S, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. 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, INDIRECT, SPECIAL, INCIDENTAL O

7、R CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRU- MENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POS- SIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS T

8、HE RESULT OF INJURY TO ANY PERSON, OR DAM- AGE TO PROPERTY. Keithley Instruments, Inc. 28775 Aurora Road Cleveland, OH 44139 440-248-0400 Fax: 440-248-6168 BELGIUM:Keithley Instruments B.V. Bergensesteenweg 709 B-1600 Sint-Pieters-Leeuw 02/363 00 40 Fax: 02/363 00 64 CHINA:Keithley Instruments China

9、 Yuan Chen Xin Building, Room 705 12 Yumin Road, Dewai, Madian Beijing 100029 8610-62022886 Fax: 8610-62022892 FRANCE:Keithley Instruments Sarl B.P. 60 3, alle des Garays 91122 Palaiseau Cdex 01 64 53 20 20 Fax: 01 60 11 77 26 GERMANY:Keithley Instruments GmbH Landsberger Strasse 65 D-82110 Germerin

10、g 089/84 93 07-40 Fax: 089/84 93 07-34 GREAT BRITAIN:Keithley Instruments Ltd The Minster 58 Portman Road Reading, Berkshire RG30 1EA 0118-9 57 56 66 Fax: 0118-9 59 64 69 INDIA:Keithley Instruments GmbH Flat 2B, WILOCRISSA 14, Rest House Crescent Bangalore 560 001 91-80-509-1320/21 Fax: 91-80-509-13

11、22 ITALY:Keithley Instruments s.r.l. Viale S. Gimignano, 38 20146 Milano 02/48 30 30 08 Fax: 02/48 30 22 74 NETHERLANDS:Keithley Instruments B.V. Postbus 559 4200 AN Gorinchem 0183-635333 Fax: 0183-630821 SWITZERLAND:Keithley Instruments SA Kriesbachstrasse 4 8600 Dbendorf 01-821 94 44 Fax: 01-820 3

12、0 81 TAIWAN:Keithley Instruments Taiwan 1 Fl. 85 Po Ai Street Hsinchu, Taiwan, R.O.C. 886-3572-9077 Fax: 886-3572-9031 6/99 RadioFans.CN 收音机爱 好者资料库 Model 6517A Electrometer Service Manual 1998, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Second Printing, April 1999 Docume

13、nt Number: 6517A-902-01 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 r

14、eleased between Revi- sions, 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

15、of the manual. Each new Revision includes a revised copy of this print history page. Revision A (Document Number 6517A-902-01). September 1998 Revision B (Document Number 6517A-902-01).April 1999 All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other b

16、rand 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 normally be used with non

17、-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 information carefully bef

18、ore using the product. The types of product users are: Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the equipment is operated within its specifi cations and operating limits, and for en- suring that operators are adequately train

19、ed. Operators use the product for its intended function. They must be trained 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 ke

20、ep it operating, for example, setting the line voltage or replac- ing consumable 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 tra

21、ined to work on live circuits, and perform safe installations and repairs 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

22、 xtures. The American National Standards Institute (ANSI) states that a 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

23、 must be protected from electric shock at all times. The responsible body 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 t

24、hemselves from the risk of electric shock. If the circuit is capable of 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 Mode

25、ls 175A, 199, 2000, 2001, 2002, and 2010) are Installation Category II. All other instruments 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 sour

26、ces. NEVER connect switching cards directly to AC mains. 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

27、the connecting cables, test leads, and jumpers for 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

28、 capacitors before: connecting or disconnecting cables 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

29、) ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the voltage being measured. The instrument and accessories must be used in accordance with its specifi cations and operating instructions or the safety of the equip- ment may be impai

30、red. 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 switching card. When fuses are used in a product, replace with same type and rating for contin

31、ued 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 closed while power is ap- plied to the device under test. Safe operation requires the use of

32、 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 operating instructions located in the manual. The symbol on an instrument shows that it can sourc

33、e 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 explains dangers that might result in personal injury or death. Always read the associat

34、ed 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. Instrumentation and accessories shall not be connected to humans. Before performing any maintenance,

35、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 purchased from Keithley Instru- ments. Standard fuses, with applicable national safety a

36、pprovals, 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 se- lected parts should be purchased only through Keithley Instruments to maintain accura

37、cy 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 an instrument, use a damp cloth or mild, water based cleaner. Clean the exterior of the instrument only. Do not apply cleaner dire

38、ctly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with no case or chassis (e.g., data acquisition board for installation into a computer) should never require cleaning if handled according to in- structions. If the board becomes con

39、taminated and operation is af- fected, the board should be returned to the factory for proper cleaning/servicing. ! Rev. 2/99 Table of Contents 1Performance Verification 1.1 Introduction . 1-1 1.2 Environmental conditions . 1-1 1.3 Warm-up period . 1-2 1.4 Line power . 1-2 1.5 Recommended test equip

40、ment . 1-2 1.5.1 Meter performance verification equipment . 1-2 1.5.2 Voltage source verification equipment . 1-3 1.5.3 Temperature verification equipment . 1-3 1.5.4 Humidity verification equipment . 1-4 1.6 Verification limits . 1-4 1.7 Restoring default conditions . 1-4 1.8 Offset voltage and bia

41、s current calibration . 1-5 1.8.1 Front panel offset calibration . 1-5 1.8.2 IEEE-488 bus offset calibration . 1-5 1.9 Meter verification procedures . 1-5 1.9.1 DC volts verification . 1-6 1.9.2 DC amps verification . 1-6 1.9.3 Coulombs verification . 1-9 1.9.4 Ohms verification . 1-11 1.10 Voltage source verification .