KEI2002-905-01 电路图.pdf

Model 2002Multimeter Calibration Manual A G R E A T E RM E A S U R E O F C O N F I D E N C E RadioFans.CN 收音机爱 好者资料库 Model 2002 Multimeter Calibration Manual 1994, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Fourth Printing, May 2004 Document Number: 2002-905-01 Rev. D 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- 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 of the manual. Each new Revision includes a revised copy of this print history page. Revision A (Document Number 2002-905-01).April 1994 Addendum A(Document Number 2002-905-02).October 1995 Addendum A(Document Number 2002-905-03).July 1996 Revision B (Document Number 2002-905-01) . June 1998 Revision C (Document Number 2002-905-01) .November 2000 Revision D (Document Number 2002-905-01). May 2004 All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand and product names are trademarks or registered trademarks of their respective holders RadioFans.CN 收音机爱 好者资料库 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-haz- ardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by qualified personnel who recog- nize shock hazards and are familiar with the safety precautions re- quired to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using the product. Refer to the manual for complete product specifications. If the product is used in a manner not specified, the protection pro- vided by the product may be impaired. 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 specifications and operating limits, and for en- suring 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 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 properly, for example, setting the line voltage or replacing consumable materials. Maintenance procedures are de- scribed in the manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel. Service personnel are trained 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. Keithley products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and data I/O sig- nals are Measurement Category I and must not be directly connect- ed to mains voltage or to voltage sources with high transient over- voltages. Measurement Category II connections require protection for high transient over-voltages often associated with local AC mains connections. Assume all measurement, control, and data I/O connections are for connection to Category I sources unless other- wise marked or described in the Manual. Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fixtures. 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 ex- pect that hazardous voltage is present in any unknown circuit before measuring. Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators are pre- vented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human con- tact. Product operators in these circumstances 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. 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 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 the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use. When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input power dis- connect device must be provided, in close proximity to the equip- ment and within easy reach of the operator. 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 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 com- mon side of the circuit under test or power line (earth) 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 specifications and operating instructions or the safety of the equip- ment may be impaired. Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating informa- tion, and as shown on the instrument or test fixture panels, or switching card. When fuses are used in a product, replace with same type and rating for continued protection against fire 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 fixture, keep the lid closed while power is ap- plied to the device under test. Safe operation requires the use of a lid interlock. 5/03 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 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 symbol indicates a connection terminal to the equipment frame. The WARNING heading in a manual 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. Instrumentation 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 fire, 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 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 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 office 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 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 in- structions. If the board becomes contaminated and operation is af- fected, the board should be returned to the factory for proper cleaning/servicing. ! Table of Contents 1Performance Verification 1.1Introduction. 1-1 1.2Environmental conditions. 1-1 1.3Warm-up period. 1-1 1.4Line power . 1-2 1.5Recommended test equipment. 1-2 1.6Verification limits. 1-2 1.6.1Reading limit calculation example. 1-2 1.6.2Additional derating factors. 1-2 1.7Restoring default conditions . 1-2 1.8Verification procedures. 1-4 1.8.1DC volts verification. 1-4 1.8.2AC volts verification. 1-6 1.8.3DC current verification . 1-11 1.8.4AC current verification . 1-12 1.8.5Resistance verification. 1-13 1.8.6Frequency accuracy verification. 1-15 1.8.7Temperature reading checks . 1-17 2Calibration 2.1Introduction. 2-1 2.2Environmental conditions. 2-2 2.3Warm-up period. 2-2 2.4Line power . 2-2 2.5Calibration lock. 2-2 2.5.1Comprehensive calibration lock. 2-2 2.5.2Low-level calibration lock. 2-2 2.5.3IEEE-488 bus calibration lock status. 2-2 2.6IEEE-488 bus calibration commands. 2-2 2.7Calibration errors . 2-4 2.7.1Front panel error reporting. 2-4 2.7.2IEEE-488 bus error reporting. 2-4 2.8Comprehensive calibration . 2-4 2.8.1Recommended equipment for comprehensive calibration. 2-4 2.8.2Front panel comprehensive calibration.