KEI 7076 Instruction 电路图.pdf

《KEI 7076 Instruction 电路图.pdf》由会员分享，可在线阅读，更多相关《KEI 7076 Instruction 电路图.pdf（72页珍藏版）》请在收音机爱好者资料库上搜索。

1、Model 7076 General Purpose Matrix Card Dual 4 x 12 Instruction Manual Contains Operating and Servicing Information Publication Date: April 1991 Document Number: 7076-901-01 Rev. B 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 an

2、d 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 replac

3、e any product that prows 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 f

4、acility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for the balance of the origi- nal warranty period, or at least 90 days. LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification witho

5、ut Keithleys express written consent, or misuse of any product ot 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 WARRANT

6、IES, EXPRESSED 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 SHALL BE LIABLE FOR ANY DIRECT, INDI- RECT, SPECIAL, INCIDENT

7、AL 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 LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS T

8、HE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY. Keithley Instruments, Inc. * 28775 Aurora Road * Cleveland, OH 44139 - 216-248-0400 -Fax: 216-248-6168 - RadioFans.CN 收音机爱 好者资料库 General Purpose Matrix Card Dual 4 x 12 Model 7076 Instruction Manual 01990, Keithley Instruments, Inc. All right

9、s reserved. Cleveland, Ohio, U. S. A. Document Number: 7076-901-01 RadioFans.CN 收音机爱 好者资料库 All Keithley product names are trademarks or registered trademarks of Keithky Instruments, Inc. Other brand and product names are trademarks or registered trademarks of their respective holders SAFETY PRECAUTI

10、ONS The following safety precautions should be observed before using the Model 7076 and the associated instruments. 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 m

11、anual carefully before using the matrix card. ALWAYS remove power from the entire system (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 t

12、he matrix card. The pins of cable connectors are easily accessible making them extremely hazardous to handle while power is applied. 3. Making internal changes to the card (such as removing or installing jumpers). Exercise extreme caution when a shock hazard is present at the test f?xture. User-supp

13、lied lethal voltages may be present on the tlxture or the connector jacks. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS or42.4V peak are present. A good safety practice is to expect that hazardous voltage is present in an

14、y unknown circuit before measuring. Do not connect the card or any other instrumentation to humans. 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 appl

15、ied to the circuit 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

16、not connect the 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 co

17、nnections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections. Model 7076 Dual 4x12 Two-Pole Matrix Card MATRIXCON”GURATION:Dual4rowsby12columns.Alsocanfigurableas8rowsby 12 mhmns. Jumpers can be removed to isolate any row from the backplane. CROSSP

18、OINT CONFIGURATION: 2 pole Form A (HI, GUARD). CONNECTOR TYPE: 25.pin subminiature D connector, two for column connection, one far row connection. MAXIMUM SIGNAL LEVEL: DC Signals: IIOV DC, IA switched, 30VA ksistive load). AC Signals: 175” AC peak, IA switched, 62SVA (resistive load). COMMON MODE V

19、OLTAGE: IIOV DC, 175V AC peak pin to pi” or pi” to chassi% CONTACT LIFE: Cold Switching: 10s closures. At M.Mm”rn Signal Level: 105 closures. PATH RESISTANCE (per conductorb 0.5On initial, 1.5R at end of contact life CONTACTPOTENTIAL: 5pV per crosspaint (HI lo GUARD). OFFSET CURRENT: lOw2, lOQ l2opF

20、 nominal. Common Mode: lOQ 2OOpFnominal. CROSSTALK (IMHr, Mfi 1o;db -5OdB. INSERTION LOSS (IMHz, 5On source, 5OR load): 0.05dB typical. 3dB BANDWIDTH (500 load): 15MHz typical. RELAY DRIVE CURRENT (per crosspoint): 28mA. RELAY SEITLING TIME: 3ms. ENVIRONMENT: Operating: 0 to 5O”C, up to 35C at 70% R

21、.H. storage: -250 to WC. ACCESSORY SUPPLIED: instruction manual, jumpers for 8 x 12 expansion. 5pcifications subject to change without notice. Column Jumpers - (user Table of Contents SECTION 1 - General Information 1.1 INTRODUCTION 1.2 FEATURES . 1.3 WARRANTY INFORMATION 1.4 MANUAL ADDENDA 1.5 SAFE

22、TY SYMBOLS AND TERMS 1.6 SPECIFICATIONS . . 1.7 UNPACKING AND INSPECTION 1.7.1 Inspection for Damage . . . 1.7.2 Shipping Contents 1.7.3 Instruction Manual 1.8 REPACKING FOR SHIPMENT 1.9 OPTIONAL ACCESSORIES SECTION 2 - Operation 2.1 INTRODUCTION . 2.2 HANDLING PRECAUTIONS . 2.3 CARD INSTALLATION AN

23、D REMOVAL . 2.4 BASIC MATRIX CONFIGURATIONS . 2.4.1 4x24Matrix . 2.4.2 8xl2Matrix . 2.5 TYPICAL MATRIX SWITCHING SCHEMES . 2.5.1 Single-ended Switching. . 2.5.2 Differential Switching . 2.5.3 Guarding . 2.5.4 Sensing . 2.6 CONNECTIONS . 2.6.1 Standard Cable (Model 7075-MTC) . 2.6.2 High Isolation Ca

24、bles (Model 7076-RMTC and Model 707 dual 4 x 12 matrices, a single 4 x 24 matrix or a single 8 x 12 ma- trix. 2.5 Typical Matrix Switching Schemes: Explains some of the basic ways that a matrix can be used to source or measure. Covers single-ended switching, differential (floating) switching, sensin

25、g, shielding, and guarding. 2.6 Connections: JXxwses the various methods and techniques that can be used to connect DUTs and in and to connect row E to column 10 (22nd column), crosspoint El0 would have to be closed. These crosspoint closures assume that the matrix card is installed in slot 1 of the

26、 mainframe. The crosspoint assignments in Figure 2-2B are valid regardless of how the card is configured. The column number assignments for programming the Model 707 are determined by the mainframe slot that the matrixcard is installed in. For example, the column num- ber assignments of a matrix car

27、d installed in slot 4 of the mainframe are numbered 37 through 48. Column num- ber assignments for all six mainframe slots are listed in Table 2-1. Notice in Figure 2-2A that there are backplane jumpers located on the matrix card. With the jumpers installed, the matrix card is connected to the backp

28、lane of the Model 707 allowing matrix expansion (see paragraph 2.7). With the jumpers removed, the matrix card is iso- lated from any other cards installed in the mainframe. The physical location of these jumpers on the board is shown in Figure 2-3. 2-2 SECTION 2 Operation Mounting Screws Card Handl

29、e Figure 2-1. Matrix Card Installation Table 2-l. Column Number Assignments 1 7076 Card Location 1 Matrix Column Numbers Slot 1 1 through 12 Slot 2 13 through 24 Slot 3 25 through 36 Slot 4 37 through 48 Slot 5 49 through 60 Slot 6 61 through 72 2-3 SECTION 2 r- _- - 1 A. Simplified Schematic r- - 1

30、 igure 2-2. Model 7076 2-4 SECTION 2 Oaeration I I 1 I I I 0 0 l . Cigure 2-3. SimpIified Component layout 2.4.1 4 x 24 Matrix Figure 2-4 shows how the Model 7076 can be configured as a single 4 x 24 matrix. Row jumper wires are used to connect rows A, B, C and D to rows E, F, G and H respec- tively

31、. These connections can be made wherever it is most convenient, such as at the connector of a custom- ized cable ass$mbly, or at the instrumentation (see Figure Z-15) or DUT test fixture. In a multiple card system where badcplane jumpers are left installed, row jumpers are only required at one card.

32、 Removing the backplane jumpers will isolate the 4 x 24 matrix from any other card installed in the mainframe. Crosspoint assignments for progmmming the Model 707 do not change even though the matrix configuration of the card has changed (see Figure 2-28). For example, to connectrowAtothe24th(12)col

33、umnofthe4x24matrix (see the equivalent circuit in Figure 2-4), the Model 707 would have to be programmed to close crosspoint El2 kmmingtbecardisinstaUedinslot 1 of themainframe). Table 2-2 provides the crosspoint assignments for a Mode17076 configuredasa4x24matrixinstalled inslot 1 of the mainframe.

34、 Table2-I provides the column number assignments for the other mainframe slots. r- I Column I Fmv I I 1 2 3 4 5 6 7 I 8 Backplane Jumpers J”rnpers I I TTTTTTTTI I II/ I I I I I I Column I Equivalent Circuit igure 2-4. Model 7076 Configuredas 4 x 24Matri.r 2-6 SECTION 2 Operation Table 2-2. 4 x 24 Ma

35、trix Crosspoint Assignments M. the standard cable (Model 7075MTC), and high isolation cables (Model 7076RMTC and Model 7076-CMK). Basically, the stan- dard cable is a general purpose cable that will mate to either the ROWS or COLUMN receptacles. The high iso- lation cables provide better isolation b

36、etween paths. The Model 7076-RMTC is used to connect to the ROWS recep- tacle, while the Model 707CMTC is used to connect to the COLUMN receptacles. The available cables, as well as some miscellaneous con- nectors for customized user supplied terminations, are Cd 1 Gd Cd 2 Gd Cd 3 Gd Cd 4 Gd Cd 5 Gd

37、 Cd 6 Gd Cd 7 Gd Cd 6 Gd Cd 9 Gd CollOGd Co111 Gd Co112 Gd N/C Cd 1 HI Col2HI Cd 3 HI Co14 HI Co15 HI Co16 HI Co17 HI Co16 HI Co19 HI Col 10 HI Col 11 HI Cd 12 HI Columns (A W Columns (E H) View of receptacles looking at Rear Panel Row A Gd Row A Gd Row B HI Row C Gd Row C Gd Row D HI Row E Gd Row E

38、 Gd Row F HI Row G Gd Row G Gd Row H HI N/C Row A HI Row B Gd Row 6 Gd Row C HI ROW D Gd Row D Gd Row E HI Row F Gd Row F Gd Row G HI Row H Gd Row H Gd A) COLUMNS Receptacle (1 of 2) HI = High Gd = Guard N/C = No connection B) ROWS Receptacle igure Z-11. D-sub Receptacle Contact Assigments 2-10 SECT

39、ION 2 Ckmntion Table 2-3. Available Cables and Connectors Manufacturer Model or Part Number Description Keithley Model 7075.MTC Standard Cable Standard three-meter (10 feet) cable assembly terminated with 25-pin D-sub plugs on both ends. Mates to either the ROWS or COLUMN receptacles of the matrix c

40、ard. Keithley Model 7076.CMTC High Isolation Three-meter (10 feet), high isolation (for high isolation) cable Columns Cable assembly terminated with 25-pin D-sub plugs on both ends. Use to mate to either COLUMNS receptacle of the matrix card. Keithley Model 7076-RMTC High Isolation Three-meter (10 f

41、eet), high isolation (for high isolation) cable Rows Cable assembly terminated with 25-pin D-sub plugs on both ends. Use to mate to the ROWS receptacle of the matrix card. Keithley cs400 25-pin D-sub plug that will mate to the ROWS and COL- UMN receptacles of the matrix card. Solder-cup connections

42、simplify the building of custom cables. Keithley C%Ol 25-contact D-sub receptacle that will mate to cables termi- nated with a 25-pin D-sub plug. Keithley G-590 Plastic backshell housing for CS400. Belden 9868 High isolation cable. Same cable used for the Models 7076-RMTC and 707tXMTC cable assembli

43、es. See para- graph 2.6.2 for description. 82257000 25-pin D-sub plug for customized ribbon cable assemblies. 3357-9225 Junction shell for 3M 8225-7000 D-sub plug. summarized in Table 2-3. The cables available from Keithley are described in more detail in paragraphs 2.6.1 and 2.6.2. WARNING To avoid

44、 electrical shock that could result in injury or death, ALWAYS remove power from the entire system (Model 707, test in- struments, DUT, etc.) and discharge any ca- pacitors before connecting or disconnecting cables from the matrix card. The pins of the cable connectors are easily accessible mak- ing

45、 them extremely hazardous to handle while power is applied. Use the following procedure to connect a cable termi- nated with a 25-pin D-sub plug to the matrix card: 1. Install thematrixcardin theModel707mainframeas explained in paragraph 2.3. 2. Push the plug of the cable onto the appropriate re- ce

46、ptacle of the matrix card. The cable plug and ma- trix card receptacle will only mate one way. 3. Tighten the screws of the plug housing to secure it to the panel. The same basic procedure applies for connecting the ca- ble plug to a test fixture receptacle. 2.6.1 Standard Cable (Model 7075-MTC) The

47、 standard cable (Model 7075-MT0 is a three-meter (10 feet), general purpose 24-conductor, shielded cable that is terminated with a Z-pin D-sub male plug on each end thatwillconnect toeither theROWSorCOLLJMNre- ceptacles on the matrix card. The standard cable (shown in Figure 2-12) is comprised of a flat ribbon cable that is located inside a shielded, round cable casing. The braided shield of the cable sur- rounds the ribbon cable and is subsequently connected to chassis ground when the cable is connected to a Model 7076 that is instal