KEI 7071 Instruction 电路图.pdf

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1、Model 7071 General Purpose Matrix Card Instruction Manual Contains Operating and Servicing Information Publication Date: June 1991 Document Number: 7071-901-01 Rev. D 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

2、 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 batter- ies, diskettes, and documentation. During the warranty period, we will, at our option, either repair or replace any produ

3、ct that proves to be defective. To exercise this wannty, write or call your local Kcithley representative, or contact Keithley headquarters in Cleveland, Ohio. You will bc given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Re

4、pairs 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 modification without Keithleys

5、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 leak age, or problems arising from normal wear or failure to follow instructions. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS

6、ED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY 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 SUALL BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUE

7、NTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRU- MENTS AND 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

8、OF INJURY TO ANY PERSON, OR DAM- AGE TO PROPERTY STATEMENT OF CALIBRATION This instrument has been inspected and tested in accordance with specifications published by Keithley Instruments, Inc, The accuracy and calibration of this instrument me traceable to the National Bureau of Standards through e

9、quipment which is cali- brated at planned intervals by comparison to certified standards maintained in the Laboratories of Keithley Instruments, Inc. RadioFans.CN 收音机爱 好者资料库 Instruction Manual Model 7071 General Purpose Matrix Card 01984 Keithley Instruments, Inc. Instruments Division Cleveland, Ohi

10、o, U.S.A. Document Number: 7071-901-01 RadioFans.CN 收音机爱 好者资料库 Safety Precautions The following safety precautions should be obsewed before using this product and any associated instrumentation. Although some in- trument and accessories would nomudly bc used with non-haz- ardous voltages, there are

11、situations where hazardous conditions may be present. This product is intended for “se by qoalilied personnel who recog- nize shock hazards and are familiar with the safety precautions re- quired to avoid porsiblc injury Read the operating information carefully before using the product. The types of

12、 product users are: Responsible body is the individual or group responsible for the “se and maintenaocc 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 “se the product for it

13、s intended function. They most be trained in electrical safety procedorcs and proper “se of the instru- ment. They must be proind jumpers for possible war. cracks, or breaks before each use. For maximom safety. do nut touch the product. test cables. or any other instruments while power is applied to

14、 the circuit under test. ALWAYS remove power from the entire test system and discharge any capacitors bcforc: connecting or disconnecting cables or jumpy crs, installing or removing switching cards. or making intcnul changes, such as installing or removing jumpers. Do not touch any “bjcct that could

15、 provide a curreot path to the comm” side of the circuit under test or power line (earth) ground. Always make mearencnts with dry hands while stmding on n dry, insulated surface capable of withstanding the voltage being measured. The instrument and accessories must be used in accordance with its spe

16、citications 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 defined in the specifications and operating informa- tion, and as shown on the instrument or test fixture panels, or switching car

17、d. when fuses are used in a product, replace with same type and rating for continued protection against fin: 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

18、power is ap- plied to the device under test. Safe operation requires the use of a lid interlock. Ifa screw is present, connect it to safety earth ground using the wire recommended in the user documentation. m A symbol on an instrument indicates that the uscr should re- fer to the operating instructi

19、ons located in the manual. Then symbol on an instrument shows that it can source or mca- sum 1003 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 d

20、angers 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 acc

21、essories 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 powcr transformer, test leads, and input jacks, must be purchased f

22、rom Keithley Instn- merits. Standard fuses, with applicahlc 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 sc- lead par

23、ts 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 Keithlcy Instruments office for information. To clean an instrument, use a damp cloth or mild, water based cle

24、aner. Clean the exterior of the insrmment only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instmmcnt. 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 c

25、leaning if handled according to in- stmctions. If tbc board becomes contaminated and operation is af- fccted, the board should be returned to the factory for proper cleaning/servicing. Rev. IO/99 SAFETY PRECAUTIONS The following safety precautions should be observed before using the Model 7071 and t

26、he associated instru- malts. This matrix card is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury. Read over this manual carefully before using the matrix card. ALWAYS remove power from the entire syste

27、m (Model 707, test instruments, DUT, etc.) and discharge any capacitors before doing any of the following: 1. Installing or removing the matrix card from the mainframe. 2. Connecting or disconnecting cables from the mahix card. The pins of the Model 7078MTC cable con- nectors are easily accessible m

28、aking them extremely hazardous to handle while power is applied. 3. Making internal changes to the card (such as removing or installing jumpers and quick-disconnect ter- minal blocks). Exercise extreme caution when a shock hazard is present at the test fixtire. User-supplied lethal voltages may be p

29、resent on the fixture or the connector jacks. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V Rh4S or 42.4V peak are present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit before me

30、asuring. Do not exceed ZOOV between any two pins or between any pin and earth ground Inspect the connecting cables and test leads for possible wear, cracks, or breaks before each use. For maximum safety, do not touch the test fixture, test cables or any instruments while power is applied to the circ

31、uit under test. Do not touch any object which could provide a current path to the common side of the circuit under test or power line (earth) ground. Do not exceed the maximum signal levels of the test fixture, as defined in the specifications and operation section of this manual. Do not connect the

32、 matrix card directly to unlimited power circuits. This product is intended to be used with impedance limited sources. NEVER connect the matrix card directly to ac mains. When connecting sources, install protective devices to limit fault current and voltage to the card The chassis connections on the

33、 PC board (located behind the front panel of the matrix card) must only be used as shield connections for measuring circuits, NOT as safety earth ground connections. SPECIFICATIONS MATRIX CONFIGURATION: 8 rows by 12 columns. CROSSPOINT CONFIGURATION: Spole Form A. CONNECTOR TYYPE: Quick disconnect u

34、sing 38 pin umnectom or screw temals (HI, LO, Guard). ISOLATION: Path WvIIiz, 1MO load): 1OWo. clOpF. 4OdB. DifferentfaI: 109, 45pF nominal. Common Mode: lOR, 165pF nominal. INSERTION LOSS (YMHz, 50” source, IMR load): O.ldB tvoicaf. MAXIMUM SIGNAL LEVEL:. 2CQV.lA cany/O.SA switched. 1OVA peak (resi

35、stive load). COMMON MODE VOLTAGE: 2ooV maximum between any 2 pins or chassis. CONTACT LIFE: Cold Switching: 10 closures. At Mn Manual 1.8 REPACKING FOR SHIPMENT 1.9 OPTIONAL ACCESSORIES. SECTION 2-Operation . . . . . 2.1 2.2 2.3 2.4 2.4.1 2.4.2 2.4.3 2.4.4 2.5 2.5.1 2.5.2 2.5.3 2.6 2.6.1 2.6.2 2.6.3

36、 2.6.4 2.7 2.7.1 2.7.2 2.7.3 INTRODUCITON . . HANDLING PRECAUTIONS . . Contents . . . . . . . . . . . . CARD INSTALLtUlON AND REMOVAL . BASIC MAIRIX CONFIGURATIONS . . Single-Ended Switching . . .,. Differential Switching . Guarding . . . Sensing . . . CONNECTION METHODS . Connection Methods Using M

37、ass Terminated Cable (Model 7U78MTC). . Direct Connection Method . Connection Method Using Connector Kit (Model 7078KIT) . MATRIXEXIANSION . Narrow Matrix Expansion. . WideMatrixExpansion . PartiaIMatrixImplementation . Mainframe MahixExpansion . TYTICAL CONNECI-ION SCHEMES . Single Card System . Mu

38、ltiple Card System . Multiple Mainframe System . . . SECTION 3-Applications 3.1 INTRODUCTION . 3-l 3.2 THICK FILM RESISTOR NETWORK TESTING . 31 3.2.1 Four-terminal Ohms Measurements . 3-2 3.2.2 Voltage Divider Checks . 33 3.2.3 Current Shunt Checks . 3-5 3.3 TRANSISMR TESTING . 3-5 3.3.1 Current Gai

39、n Checks . 3-7 3.3.2 I, and V., Measurements . 37 ; 2 2 2 2 2 1-l 1-l 1-l 1-l l-1 l-1 1-l l-1 1-2 1-2 1-2 1-2 2-l 2-l 2-l 2-2 2-b 2-6 2-6 2-6 2-8 2-9 !-15 !-15 t-18 98 !-19 -20 -20 :-21 :-21 ,722 -22 SECTION 4-Service Infmmation 4.1 4.2 4.3 4.4 4.4.1 4.4.2 4.4.3 4.4.4 4.4.5 4.4.6 4.4.7 4.5 4.5.1 4.5

40、.2 4.5.3 4.6 4.7 4.7.1 4.7.2 INTRODUCITON . 4-l HANDLING AND CLEANING PRECAUTIONS . 4-1 RELAY TEST PROGRAM SETUP . 4-l PERFORMANCE VERIPICATION . 42 EnvhonmentaI Conditions . 43 Recommended Equipment . 43 Path Resistance Tests . 43 Offset Current Tests. . 45 Contact Potential Tests . 4-7 Path Isolation Tests . 49 . DtierenhaI and Common Mode Isolation Tests . 411 PRINCIPLESOF OPERATION . 413 Card Identification . 4-W switching circuitry .