KEI 248 Instruction 电路图.pdf

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1、Model 248High Voltage Supply 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 Instrument

2、s, 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 product that proves to be defective. To exercise this warranty, write o

3、r 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 prep

4、aid. 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

5、 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 WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILI

6、TY 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 OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRU- MENTS AND

7、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 THE RESULT OF INJURY TO ANY PERSON, OR DAM- AGE TO PROPERTY. Keithley Ins

8、truments, Inc. 28775 Aurora Road Cleveland, 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

9、Cdex 33-1-60-11-51-55 Fax: 33-1-60-11-77-26 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

10、 ITALY:Keithley Instruments SRL Viale 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

11、-1-8203081 TAIWAN:Keithley Instruments 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 248 High Voltage Supply Instruction Manual 1995, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Second Printing, February 1999

12、 Document Number: 248-901-01 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

13、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 Revi

14、sion of the manual. Each new Revision includes a revised copy of this print history page. Revision A (Document Number 248-901-01).December 1995 Addendum A (Document Number 248-901-02).February 1996 Addendum A (Document Number 248-901-03).July 1997 Revision B (Document Number 248-901-01).February 199

15、9 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. Safety Precautions The following safety precautions should be observed before using this product and a

16、ny 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 wit

17、h the safety precautions re- quired to avoid possible injury. Read 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 operat

18、ed 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 c

19、ontact 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 consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if the operator ma

20、y 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 repairs of products. Only properly trained ser- vice personnel may perform installation and service procedures. Exercise extreme

21、 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

22、to ex- pect that hazardous voltage is present in any un- known circuit before 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

23、 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 operating at or above 1000 volts, no conductive part of the circuit may be exposed. As described in the International

24、Electrotechnical Commission (IEC) Standard IEC 664, digital multimeter measuring 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

25、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 ope

26、rating 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. For maximum safety, do not touch the product, test cables, or any other instruments while

27、 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

28、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 while standing on a dry, insulated surface capable of withstanding the voltage being measured. The instrument and accessories must be used i

29、n 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 x

30、ture 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 xt

31、ure, 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

32、- 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 WARNIN

33、G 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 w

34、arranty. 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

35、 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 c

36、omponent. (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 the instrument, use

37、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. ! Rev. 1/99 Keithley Instruments, Inc. Cleveland, Ohio 44139 DRN. CKD. APP. DATE DATE DATE PART NUMBER LTRREVISI

38、ONSAPP. DATE FORM 28777A-SBG BRUNING 40-21 62198-SBG PURCHASED ITEM SPECIFICATIONS SBG 10/25/00 SPEC-248 GENERAL DIMENSIONS: 89mm high 206mm wide 406mm deep (3.5 in 8.1 in 16 in). WEIGHT: 3.7 kg (8 lbs). INPUT POWER: 55 watts; 100, 120, 220, 240V AC 10%, 50 or 60Hz. OUTPUT HIGH VOLTAGE CONNECTOR: SH

39、V male (Kings Type 1704-1 or equiva- lent), on rear panel. REMOTE INTERFACE: GPIB (IEEE-488.1). WARRANTY: One year parts and labor on materials and workmanship. WARM-UP TIME: 1 hour. OPERATING ENVIRONMENT: 0C to 50C. MONITOR OUTPUTS: Output Scale: 0 to +10V for 0 to full range output regardless of p

40、olarity. Current Rating: 10mA maximum. Output Impedance: 1. Accuracy: 0.2% of full scale. Update Rate: 8Hz. EXTERNAL VOLTAGE SET: Input Scale: 0 to +10V for 0 to full range output regardless of polarity. Input Impedance: 1M. Accuracy: 0.2% of full scale. Update Rate: 16Hz. Output Slew Rate: 5kV Work

41、ing Voltage) Safety Shield Safety Earth Ground Warning: Turn off high voltage, and allow voltage to discharge before connecting or disconnecting high voltage cable. Load When the voltage select switch is in the SET position, the I/MON jack remains an output signal, but the SET/MON jack becomes an in

42、put signal and sets the high voltage source value over the same range as the control voltage in- put. For example, a 2V analog voltage input results in a 1kV source output voltage. When the switch is in the SET posi- tion, the REAR LED on the front panel is lit, indicating that high voltage is under

43、 analog control and cannot be adjusted from the keypad. All signals are positive voltages, indepen- dent of output voltage polarity. Figures 2-4 and 2-5 show example analog output connec- tions. WARNING The BNC jack outer shells are connect- ed to chassis ground and cannot be fl oated. IEEE-488 STD

44、PORT The 24-pin IEEE-488 (GPIB) connector allows computer control of the Model 248. The primary address is set from the front panel using the GPIB ADDR keys. Refer to Section 3 for detailed IEEE-488 programming information. Operation 2-6 2.6Guide to operation 2.6.1Setting the output voltage The volt

45、age setting can be changed with the high voltage on or off. The basic procedure is as follows: 1. Press the SELECT key until the VOLTAGE SET LED is on. The present voltage setting will appear on the center display. 2. To change the voltage setting, enter the desired voltage using either the numeric

46、or cursor keys. After the new value has been entered into the center display, press ENTER to update the output voltage. 3. The VOLTAGE SET LED will fl ash until ENTER or CLR is pressed to remind you that the displayed value is not the actual programmed value. Figure 2-4 Voltage monitor, current moni

47、tor connections MON SET SET/MONI MON 0-10V0-10V V O L T A G E WARNING: NO USER SERVICEABLE PARTS INSIDE. REFER TO USER MANUAL FOR SAFETY NOTICE. FOR USE BY QUALIFIED PERSONNEL ONLY. FUSE (SLOW BLOW) 1A 100/120V ;1/2A 220/240V MADE IN U.S.A. IEEE-488 STD PORT CAUTION: CHANGING POLARITY WITH POWER ON

48、WILL DAMAGE THE UNIT POSNEG HIGH VOLTAGE WARNING FUSE PULL Voltage Monitor Voltmeter (0-10V DC) Current Monitor Voltmeter (0-10V DC) Model 248 BNCCoax MON Position Input Input MON SET SET/MONI MON 0-10V0-10V V O L T A G E WARNING: NO USER SERVICEABLE PARTS INSIDE. REFER TO USER MANUAL FOR SAFETY NOTICE. FOR USE BY QUALIFIED PERSONNEL ONLY. FUSE (SLOW BLOW) 1A 100/120V ;1/2A 220/240V MADE IN U.S.