KEI 776 Instruction 电路图.pdf

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1、Model 776 Programmable Counter/Timer 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 In

2、struments, 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, w

3、rite 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, transportatio

4、n 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

5、. 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 MERCHANTA

6、BILITY 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

7、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 I

8、nstruments, 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 Yuan Chen Xin Building, Room 705 12 Yumin Road, Dewai, Madian Beijing

9、 100029 8610-62022886 Fax: 8610-62022892 FRANCE:Keithley Instruments Sarl 3, alle des Garays 91127 Palaiseau Cedex 01-64 53 20 20 Fax: 01-60 11 77 26 GERMANY:Keithley Instruments GmbH Landsberger Strasse 65 82110 Germering 089/84 93 07-40 Fax: 089/84 93 07-34 GREAT BRITAIN:Keithley Instruments Ltd T

10、he 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: 91-80-509-1322 ITALY:Keithley Instruments s.r.l. Viale S. Gimignano, 38 20146 Milano 02-48

11、39 16 01 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 30 81 TAIWAN:Keithley Instruments Taiwan 1 Fl. 85 Po Ai Street Hsinchu, Taiwan,

12、R.O.C. 886-3572-9077 Fax: 886-3572-903 9/00 RadioFans.CN 收音机爱 好者资料库 Model 776 Programmable Counter/Timer Instruction Manual Serial Prefi x T74 1993, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Fifth Printing, April 2001 Document Number: 776-901-01 Rev. E RadioFans.CN 收音机爱

13、 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 Revisions, contain important cha

14、nge information 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 the new Revision of the manual. Each new Revision includes a revised

15、copy of this print history page. Addendum D (Document Number 776-901-02) . January 1999 Revision E (Document Number 776-901-01). April 2001 All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand and product names are trademarks or registered trad

16、emarks 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-haz- ardous voltages, there are situations where hazard

17、ous 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 before using the product. The types of product users are: R

18、esponsible 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.

19、 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, for example, setting the line voltage o

20、r 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 trained to work on live circuits, and perform safe installa

21、tions 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 Electrotec

22、hnical 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 tr

23、ansient over-voltages often associated with local AC mains connections. The user should assume all measurement, control, and data I/O connections are for connection to Category I sources un- less otherwise marked or described in the Manual. Exercise extreme caution when a shock hazard is present. Le

24、thal 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

25、 in any unknown 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 must be exposed to potential human contact. Pr

26、oduct 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. Do not connect switching cards directly to unlimited power circuits. They are int

27、ended 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

28、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

29、 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 b

30、efore: 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. A

31、lways 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

32、 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 protect

33、ion 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 inte

34、rlock. 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- s

35、ure 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- m

36、ation 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

37、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, m

38、ay 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 func

39、tionality 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

40、 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 a

41、nd operation is af- fected, the board should be returned to the factory for proper cleaning/servicing. ! 2/01 1 l-l l-2 l-3 1-4 l-5 l-6 1-7 l-8 2 installation 2-1 Introduction . 2-1 2-2 Performance Checks. . .2-I 2-3 Power Requirements. . .2-I 2-4 Grounding Requirements. . .,.,2-I 2-5 Installation a

42、nd Mounting . 2-2 2-6 Bench Mounting . 2-2 2-7 Rack Mounting. . 2-2 2-8 Portable Use. . 2-2 2-9 Short Term Storage. . 2-2 2-10 Long Term Storage or Re-packaging For Shipment . 2-2 2-11 Safety . 2-3 3 3-l 3-2 3-2-l Table of Contents General Information Introduction . I-1 Instrument and Manual Identification . 1-I Configuration. . l-2 Warranty Information . l-2 Manual Addenda . I -2