KEI 2015 Service 电路图.pdf

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1、 Contains Servicing Information Model 2015 THD Multimeter Service Manual 2015 THD MULTIMETER RANGE ! F 500V PEAK FRONT/REAR 3A 250V AMPS HI INPUT LO SENSE 4 WIRE INPUTS 350V PEAK 1000V PEAK AUTO SHIFT LOCAL POWER RANGE R SHIFT CH1REM TALK LSTN SRQ STAT RELFILT 4W BUFFER MATH REAR SCAN TIMER STEPCH2C

2、H3CH4CH5CH6CH7CH8CH9CH10 HOLDTRIGFASTMEDSLOWAUTOERR EXITENTERDIGITSRATE RELFILTERTRIGEX TRIGSTORERECALL SOURCEMEAS DCVDCI MATHTHDdBm ACVACI24FREQTEMP dBCONTPERIOD TCOUPL LIMITSON/OFFDELAYHOLD SAVESETUPCONFIGHALT TEST RS232GPIB CAL STEPSCAN THD RadioFans.CN 收音机爱 好者资料库 WARRANTY Keithley Instruments, I

3、nc. 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 items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation. During the

4、 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 representative, or contact Keithley headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions. S

5、end the product, transporta- tion prepaid, to the indicated service facility. 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

6、does not apply to defects resulting from product modifi cation without Keithleys express writ- ten consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non- rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failur

7、e to fol- low instructions. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICU- LAR USE. THE REMEDIES PROVIDED HEREIN ARE BUYERS SOLE AND EXCLUSIVE REME- DIES. NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY O

8、F ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARIS- ING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRU- MENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, B

9、UT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PER- SON, OR DAMAGE TO PROPERTY. 1/99 RadioFans.CN 收音机爱 好者资料库 Model 2015 THD Multimeter Service Manual 1998, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Third Printin

10、g, June 1999 Document Number: 2015-902-01 Rev. C 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 sub- sequent updates.

11、Addenda, which are released between Revisions, contain important change in- formation that the user should incorporate immediately into the manual. Addenda are numbered sequentially. When a new Revision is created, all Addenda associated with the previous Revision of the manual are incorporated into

12、 the new Revision of the manual. Each new Revision includes a revised copy of this print history page. Revision A (Document Number 2015-902-01).May 1998 Revision B (Document Number 2015-902-01).July 1998 Revision C (Document Number 2015-902-01).June 1999 All Keithley product names are trademarks or

13、registered trademarks of Keithley Instruments, Inc. Other brand 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 instrumen- tation. Although some instruments

14、and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by qualifi ed personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury. Rea

15、d the operating information 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, for ensuring that the equipment is operated within its specifi cations and operating limits, and for ensur

16、ing that operators are adequately trained. Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the instrument. They must be protected from electric shock and contact with hazardous live circuits. Maintenance personnel perform ro

17、utine procedures on the product to keep it operating, for example, setting the line voltage or replacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be performed only by ser- vice p

18、ersonnel. Service personnel are trained to work on live circuits, and perform safe installations and repairs of products. Only properly trained service personnel may perform installation and service procedures. Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on

19、 cable connector jacks or test fi 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

20、 measuring. Users of this product 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 circumsta

21、nces must be trained to protect themselves 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 measur

22、ing circuits (e.g., Keithley Models 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

23、 used with imped- ance limited sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective devices to limit fault current and voltage to the card. Before operating an instrument, make sure the line cord is connected to a properly ground

24、ed power receptacle. Inspect 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

25、test system and discharge any capacitors before: connecting or disconnecting cables or jumpers, 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 unde

26、r test or power line (earth) ground. Always make measurements with dry hands while standing on a dry, insulated surface ca- pable 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

27、 the equipment may be impaired. Do not exceed the maximum signal levels of the instruments and accessories, as defi ned in the specifi cations and operating information, and as shown on the instrument or test fi xture panels, or switching card. When fuses are used in a product, replace with same typ

28、e 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 closed while power is applied to the device under test. Safe operatio

29、n 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 documen- tation. The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual. The symbol on an instrument sh

30、ows that it can source or measure 1000 volts or more, including the com- bined 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. Alw

31、ays read the associated information 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 performin

32、g 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 purchased from Keithley Instruments. Standard fuses, with applicable

33、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 selected parts should be purchased only through Keithley Instruments to

34、maintain accu- racy 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 a

35、pply cleaner directly 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 instructions. If the bo

36、ard becomes contaminated and op- eration is affected, the board should be returned to the factory for proper cleaning/servicing. ! Rev. 2/99 Table of Contents 1 Performance Verifi cation Introduction . 1-2 Verifi cation test requirements . 1-3 Environmental conditions . 1-3 Warm-up period . 1-3 Line

37、 power . 1-3 Recommended test equipment . 1-4 Verifi cation limits . 1-5 Example reading limit calculation . 1-5 Calculating resistance reading limits . 1-5 Restoring factory defaults . 1-6 Performing the verifi cation test procedures . 1-7 Test summary . 1-7 Test considerations . 1-7 Verifying DC v

38、oltage . 1-8 Verifying AC voltage . 1-10 Verifying DC current . 1-12 Verifying AC current . 1-13 Verifying resistance . 1-14 Verifying temperature . 1-16 Verifying frequency . 1-17 Verifying total harmonic distortion . 1-18 Verifying function generator amplitude . 1-19 2 Calibration Introduction . 2

39、-2 Environmental conditions . 2-3 Warm-up period . 2-3 Line power . 2-3 Calibration considerations . 2-4 Calibration code . 2-5 Front panel calibration code . 2-5 Remote calibration code . 2-5 Comprehensive calibration . 2-6 Calibration cycle . 2-6 Recommended equipment . 2-6 Aborting calibration . 2-7 Front panel calibration . 2-7 Preparing the Model 2015 for calibration . 2-7 Front panel short and open calibration . 2-8 DC volts calibration . 2-9 Resistance calibration . 2-11 DC current calibration . 2-12 AC voltage calibration . 2-13 AC current calibration . 2