KEI 7072 Instruction 电路图.pdf

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1、Instruction Manual Model 7072 Semiconductor Matrix Card Contains Operating and Servicing Information RadioFans.CN 收音机爱 好者资料库 WARRANTY Keithley Instruments, Inc. warrants this product to he free from defects in material and workmanship for a period of I year from date of shipment. Keithley Instrument

2、s, Inc. warrants the following items for 90 days from the date of shipment: prohcs, cahlcs, rcchargcahlc hattcr- its, diskcttcs, and documentation During tbc warranty period, we will, at our option, either repair or replace any product that proves to he defective. To exercise this warranty, write or

3、 call your local Keithley representative, or contact Keithley headquarters in Clcvcland, Ohio. You will he given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs will he made and the product returned, transportation prepa

4、id. Repaired or replaced products arc warranted for the halancc of the original warranty period, or at last 90 days. LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithleys express written consent, or misuse of any product or part. This wa

5、rranty also does not apply to fuses, software, non-rechargeahlc battcrics, damage from battery leak- age, or prohlcms 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

6、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 SO

7、FTWARE 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. STATEMENT OF C

8、ALIBRATION This instrument has hecn inspcctcd and tested in accordance with specifications puhlishcd by Kcithlcy Instruments, Inc. The accuracy and calibration of this instrument al-c traceahlc to the National Bureau of Standards through cquipmcnt which is cali- brated at planned intervals by compar

9、ison to certified standards maintained in the Laboratories of Kcithlcy Instruments, Inc. RadioFans.CN 收音机爱 好者资料库 Model 7072 Semiconductor Matrix Card Instruction Manual 01988, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Third Printing, April 2000 Document Number: 7072-901

10、-01 Rev. C 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 ,II phabetically as the manual undergoes subsequent updates. Addenda, which arc released between Re

11、visions, contain important change information that the user should incorporate immcdiatcly into the manual. Addenda arc numbcrcd 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 ne

12、w Revision includes a revised copy of this print history page. Revision A (Document Numbcr 7072-901-01) . . . February lY88 Revision B (Document Number 7072-901-01) . . April I988 Addendum B (Document Number 7072-901-02). . April I988 Addendum B (Document Numbcr 7072-901-03). . February I996 Revisio

13、n C (Document Number 7072-901-01) ,.,.,.,., April 2000 Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation. Although some in- tmmcnt and accessories would normally be used with non-haz- ardous voltages, there are sitilaf

14、ions when hazardous conditions may be prcscnt. This product is intended for use by qualified personnel who recog- nize shock hazards and are familiar with the safety precautions rc- quired to avoid possible injury Read the operating information carefully before using the product. The types of produc

15、t 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 inten

16、ded 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, for example, setting the l

17、ine voltage or replac- ing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state ifthe 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 s

18、afe installations and repairs ofproducts. Only properly trained ser- vice personnel may perform installation and service procedures. 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 Insti

19、tute (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. Users of this product must bc protected from electric shock at all

20、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. Product users in these circumstances must bc trained to protect themsclvcs from the risk of electric shock. If

21、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 Electrotechnical Commission (IEC) Standard IEC 664, digital multimctcr measuring circuits (e.g., Keithley Models 175.A. 199,2000,2001,2002, and 2010) are In

22、stallation Category II. All other instrumentssignal terminals are Installation Category I and must not be connected to mains. 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

23、 mains. When con- necting sources to switching cards, install protective devices to lim- it fault current and voltage to the card. Bcforc 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 fo

24、r possible wear, cracks, or breaks before each use. 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 cntire test system and discharge any capacitors before: connecting or disconnecting c

25、ables 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 common side of the circuit under test or power line (earth) ground. Always make measurements with dly hands

26、 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 oftbe equip- ment may be impaired. Do not exceed the maximum signal levels ofthe

27、instruments and ac- cessories, as defined in the specifications and operating informa- tion, and us 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

28、 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 up- plied to the device under test. Safe operation requires the use of a lid interlock. Ifa screw is present, connect it to saf

29、ety earth ground using the wire recommended in the user documentation. Then symbol on a” instrument indicates that the user should re- fer to the operating instructions located in the manual. Them symbol on an instrument shows that it can source or mca- sure 1000 volts or mom, including the combined

30、 effect of normal and c”,” 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 indic

31、ated procedure. The CAUTION heading in a manual explains hazards that could damage the instmmcnt. 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 pr

32、otection from electric shock and fire, replaccmcnt components in mains circuits, including the power transformer, test leads, and input jacks, must be purchased from Kcithlcy Instm- men an access door on top of the mainframe allows access to the SMB connectors after the card is installed. 2-l I OPER

33、ATION - CARD HANDLE MOUNTING SCREWS Figure 2-1. Model 7072 InstallatiOtI 2-2 I I OPERATION 1. Before installing the card, make sure the access door on top of the Model 707 is fully closed and secured. The access door contains tracks for the card slots and must be in place to properly install the car

34、d. 2. With one hand grasping the handle, and the other holding the bottom of the card, line up the card with the tracks in the desired slot. Make certain that the com- ponent side of the card is facing the fan on the mainframe. CAUTION CAUTION Do not touch the card surfaces or any com- Do not touch

35、the card surfaces or any com- ponents to avoid contamination that could ponents to avoid contamination that could degrade card performance. degrade card performance. 3. Slide the card into the mainframe until it is properly seated in the edge connectors at the back of the slot. Once the card is prop

36、erly seated, secure it to the main- frame by finger tightening the spring-loaded screws. WARNING The mounting screws must be secured to en- sure a proper chassis ground connection be- tween the card and the mainframe. Failure to properly secure this ground connection may - result in personal injury

37、or death due to elec- tric shock. 4. To remove a card, first turn off the power and discon- nect the line cord from the mainframe. Disconnect all external and internal cables (internal cables can be reached through the access door). Loosen the mounting screws, then pull the card out of the mainframe

38、 by the handle. When the back edge of the card clears the main- frame, support it by grasping the bottom edge near the back edge. 2.5 CONNECTIONS Card connectors, recommended cables and adapters, and typical connections to test instruments are discussed in the following paragraphs. 2.5.1 Card Connec

39、tors The card connectors are shown in Figure 2-2. Each row and column is equipped with a 3-lug female triax connector. As shown in Figure 2-3, the center conductor is SIGNAL, the inner shield is GUARD, and the outer shield, or shell is chassis ground. Note that 3-lug connectors are used to avoid pos

40、sible damage from inadvertently attempting to connect BNC cables. Mounilng screw A-H 3 j, LOW - current Rows )2 B 3 4 5 6 carrying Handle Mountlng SCPW -Columns i-12 Figure 2-2. Card Connectors 2-3 I I OPERATION - Chassis Ground Warning : Do not Exceed Maximum Voltage Levels Shown Figure 2-3. Triax

41、Connector Configuration WARNING Do not exceed 200V between SIGNAL and GUARD, or between SIGNAL and chassis ground, or GUARD and chassis ground. The Model 7072 has 12 columns that are labelled 1 through 12, as well as eight rows, A through H. Rows A and B are labelled LOW I and are intended for low-c

42、urrent measure- ments. Rows G and H are labelled CV and are designed for capacitance-voltage measurements. Rows C through F are general purpose rows that can be used for ordinary voltage, current, or resistance measurements. 2.5.2 Recommended Cables and Adapters Table 2-l summarizes the cables and a

43、dapters recommend- ed for use with the Model 7072. Equivalent user-supplied items may be substituted as long as they are of sufficient quality (low offset current, high leakage resistance). Using substandard cables and adapters may degrade the integrity of the measurements made using the matrix card

44、. See paragraph 2.7 for a discussion of measurement considera- tions. Table 2-1. Recommended Cables and Adapters Description 6171 3-slot male to 2-lug female triax. 6011 2-slot triax to alliga- tor cable* 7078-TRX-3, 7078TRX-10 triax cables 7078.TRX-T triax tee adapter 7078TRX-BNC triax to BNC adapt

45、er 7025 unterminated triax (2 slot) Guarded adapter (6167*) Applications Connect 2.slot triax cable to 7072 7072 input/output connections 7072 input/output connections Daisy chain 7072 columns or rows Connect BNC cables to 7072 For custom 7072 connections Guarded current source *Model 6171 adapter r

46、equired to connect these cables to Model 7072 *6167 requires modification by disconnecting input LO internally. 2.5.3 Triaxial to Banana Plug Adapter Preparation For instruments that use banana jacks, a special 3-slot hiax- to-single banana plug must be prepared, as discussed below. This special cab

47、le can be prepared as outlined below using the parts listed in Table 2-2. Note that you can use either an unterminated triax cable, or cut a dual-connector cable (7L?78-TRX-10) in half to construct two cables. The steps for the procedure below are shown in Figure 2-4. 1. Using a knife, cut and strip

48、 back the outer insulation about 1% inches. 2. Remove the outer insulation, then cut away the outer shield back as far as the insulation is stripped. 3. Carefully strip away the insulation over the inner shield one inch, then cut the inner shield off even with the stripped insulation. 4. Strip the inner conductor % inch, then twist the strands together. 5. Unscrew the cover from a banana plug, then slide the cover over the center conductor of the t see Figures 2-21 and 2-24 for shielding and guarding information. Also, 2-pole switching for row