KEI 224 Instruction 电路图.pdf

Model 224 Programmable Current Source Instruction 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 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship 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 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 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 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 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 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. THE REMEDIES PRO- VIDED 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 OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIM- ITED 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 Cleveland, Ohio 44139 440-248-0400 Fax: 440-248-6168 1-888-KEITHLEY (534-8453) Sales Offi ces:BELGIUM:Bergensesteenweg 709 B-1600 Sint-Pieters-Leeuw 02-363 00 40 Fax: 02/363 00 64 CHINA:Yuan Chen Xin Building, Room 705 12 Yumin Road, Dewai, Madian Beijing 100029 8610-6202-2886 Fax: 8610-6202-2892 FINLAND:Tietjntie 2 02130 Espoo Phone: 09-54 75 08 10 Fax: 09-25 10 51 00 FRANCE:3, alle des Garays 91127 Palaiseau Cdex 01-64 53 20 20 Fax: 01-60 11 77 26 GERMANY:Landsberger Strasse 65 82110 Germering 089/84 93 07-40 Fax: 089/84 93 07-34 GREAT BRITAIN:Unit 2 Commerce Park, Brunel Road Theale Berkshire RG7 4AB 0118 929 7500 Fax: 0118 929 7519 INDIA:Flat 2B, Willocrissa 14, Rest House Crescent Bangalore 560 001 91-80-509-1320/21 Fax: 91-80-509-1322 ITALY:Viale San Gimignano, 38 20146 Milano 02-48 39 16 01 Fax: 02-48 30 22 74 KOREA:FL., URI Building 2-14 Yangjae-Dong Seocho-Gu, Seoul 137-130 82-2-574-7778 Fax: 82-2-574-7838 NETHERLANDS:Postbus 559 4200 AN Gorinchem 0183-635333 Fax: 0183-630821 SWEDEN:c/o Regus Business Centre Frosundaviks All 15, 4tr 169 70 Solna 08-509 04 679 Fax: 08-655 26 10 SWITZERLAND:Kriesbachstrasse 4 8600 Dbendorf 01-821 94 44 Fax: 01-820 30 81 TAIWAN:1FL., 85 Po Ai Street Hsinchu, Taiwan, R.O.C. 886-3-572-9077 Fax: 886-3-572-9031 Copyright 2001 Keithley Instruments, Inc. Printed in the U.S.A. 11/01 RadioFans.CN 收音机爱 好者资料库 Model 224 Programmable Current Source Instruction Manual Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Fifth Printing, December 2001 Document Number: 224-901-01 Rev. E 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 qualifi ed 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 specifi cations. If the product is used in a manner not specifi ed, 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 specifi cations 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 Installation Category I and Installation Category II, as de- scribed in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and data I/O sig- nals are Installation Category I and must not be directly connected to mains voltage or to voltage sources with high transient over-volt- ages. Installation 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 con- nections are for connection to Category I sources unless otherwise 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 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 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 specifi cations and operating instructions or the safety of the equip- ment may be impaired. 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 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 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 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 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 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 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 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 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. ! 11/01 SPECIFICATIONS ACCURACY (1 YEAR) MAXIMUM +%rdn + offset) STEP TEMPERATURE COEFFICIENT f (%rda + offset)/OC RANGE OUTPUT - 18z-280C SIZE ii=-18C Et 28O-50C IOOmA f101.00mA 0.1 % + 5OuA 5OU.A 1OmA I19.995mA 0.05% + l five way binding posts for GUARD OUTPUT COMMON and CHASSIS; BNC (chassis isolated) connectors for EXTERNAL TRIGGER INPUT and OUTPUT. All connections on rear panel. IEEE-488 BUS INTERFACE (ootion 22431 Multiline Commands: DCL, LLO, SDC, GET, GTL, UNT, UNL, SPE, SPD. Uniline Commands: IFC, REN, EOI, SRQ, ATN. Interface Functions: SHl, AHI: T6, TEO, L4, LEO, SRl, RLI, PPO, DCI, DTl, CO, El. Output Connections: Amphenol or Cinch Series 87 IEEE and printed circuit digital I/O port. All connections on rear panel. Jnternal Programmable Parameters: Display Mode, Output, (Prefix Data Format), EOI, SRQ (including mask for over V-limit), Range, Terminator Character, Inputs (SOURCE, V-LIMIT, DWELL TIME), Output Status. Digital I/O Port: A separate I/O port consisting of four input and four output lines as well as common (IEEE-4881 and +SVDC. Outputs will drive one ITL load. Inputs represent one TTL load. The 224 can be pro- grammed to generate a “SRQ” upon any change in the four bit input data. Mating connector supplied. GENERAL DISPLAY: 0.5” LED digits, 4%-digit signed mantissa, l-digit signed ex- ponent. OVER VOLTAGE LIMIT INDICATION: “V-LIMIT” LED will blink. SELF TEST: Digital RAM, ROM, and front panel LEDs upon power up. WARMUP: 1 hour to rated accuracy. POWER: 105125 or 210-250VAC (internal switch selected), 50 or 60H2, 60 watts maximum (80VA maximum). 90-105 or 180-210VAC operation available. COOLING: Internal fan for forced air cooling. ENVIRONMENTAL LIMITS: Operating: O”-50C; up to 35OC at 70% non-condensing relative humidity. Storage: -25OC to 70C. DIMENSIONS, WEIGHT: 127mm high x 216mm wide x 359mm deep (5-l/2” x :y 6-3 6-5 6-7 iv SECTION 1 GENERAL INFORMATION 1.1 INTRODUCTION The Model 224 is a programmable current source with full range current output of 20,uA to 101 mA. The smallest step of output current is 5nA. The Model 224 has a selectable voltage compliance of up to 105V in IV increments. The value of output current can be modified in two ways: manual- ly or automatically. The automatically modified current value is incremented or decremented by the programmed rate. The time button allows the modification of the programmed auto increment/decrement rate. The control of the current value modification can be activated by an external trigger pulse ap- plied to the EXTERNAL TRIGGER INPUT. At the completion of the current value modification (each digit) the Model 224 outputs a pulse that has the specifications shown in Figure 2-5. This pulse can be used to trigger another instrument (printer, DMM, controller, etc.1 to start its programmed task. With the Model 2243 IEEE-488 interface option installed, the Model 224 can be used with any measurement system that uses ?he IEEE-488 bus. For detailed operating instructions of the Model 2243 IEEE-488 interface option, refer to the Model 2243 Instruction Manual 1.2 FEATURES The Model 224 has several convenient and easy to use features some of which are listed below. Selectable voltage compliance allows the user to select the required voltage compliance. 04% digit display with appropriate exponent and decimal point. The output current value can