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2

Multiplexer Configuration

2-1

Introduction

This section covers the basics for multiplexer switching and
is arranged as follows:

•

Basic multiplexer configurations —

Covers the basic

multiplexer configurations: dual 1

×

12 and 1

×

18 con-

figuration and single 1

×

30 configuration. The signifi-

cance of the backplane jumpers is also covered here.

•

Typical multiplex switching schemes —

Explains some

of the basic ways a multiplexer can be used to source or
measure. Covers single-ended switching, differential
(floating) switching, sensing, and SMU connections.

•

Multiplexer expansion —

Discusses the various config-

urations that are possible by using multiple cards.

Figure 2-1

Model 7021 simplified schematic

Bank B

Bank A

3

Note

: Factory configuration shown.

Bank-to-Bank

Jumpers

HI

LO

HI

LO

Backplane Jumpers

(to 7001/7002

Analog Backplane)

1

HI

LO

Jumpers

HI

LO

A

B

Switching Topology

for all Channels

HI
LO

Input (1 of 30)

HI

LO

Bank

6

2

7

8

4

9

5 10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Basic multiplexer configurations

A simplified schematic of the Model 7021 multiplex banks is
shown in Figure 2-1. It is organized as two multiplex banks:
1

×

12 and 1

×

18. Bank A has 12 inputs and one output, and

bank B has 18 inputs and one output. Two-pole switching is
provided for each multiplexer input, with HI and LO
switched. The two banks can be jumpered together to expand
multiplexer inputs, and backplane jumpers provide bank
connections to an adjacent card installed in a Model 7001/
7002 mainframe.

Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com

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Содержание 7021

Страница 1: ...cess underutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Dem...

Страница 2: ...Instruction Manual Contains Operating and Servicing Information Model 7021 Multiplexer Digital I O Card Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 3: ...E AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDI RECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS IN...

Страница 4: ...nstruction Manual 1997 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A First Printing May 1997 Document Number 7021 901 01 Rev A Artisan Scientific Quality Instrumentation Guaranteed...

Страница 5: ...e num bered 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...

Страница 6: ...re 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 s...

Страница 7: ...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...

Страница 8: ...LO HI Output LO J J HI LO Backplane J J 5V Output VEXT GND Output Channel 1 of 10 5V Input GND Input Channel 1 of 10 10K 10K 10K Multiplexer Configuration Digital I O Configuration DIGITAL I O SPECIF...

Страница 9: ...shipment 1 3 Optional accessories 1 3 2 Multiplexer Configuration Introduction 2 1 Basic multiplexer configurations 2 1 Multiplexer bank to bank jumpers 2 2 Backplane jumpers 2 2 Typical multiplexer s...

Страница 10: ...cal multiplexer connection schemes 4 9 Single card system 4 10 Two card system 4 11 Two mainframe system 4 12 Typical digital I O connection schemes 4 14 Output connection schemes 4 14 Input connectio...

Страница 11: ...d common mode isolation tests 6 11 Channel functionality test 6 13 Special handling of static sensitive devices 6 13 Principles of operation 6 14 Block diagram 6 14 ID data circuits 6 15 Multiplexer r...

Страница 12: ...igure 2 11 Multiplexer input expansion example 2 7 Figure 2 12 Mixed card type example 2 8 3 Digital I O Configuration Figure 3 1 Output configuration for pull up devices 3 1 Figure 3 2 Output configu...

Страница 13: ...esting 5 7 Figure 5 6 Four wire resistance testing 5 8 Figure 5 7 Low resistance testing 5 10 Figure 5 8 Configuration for current gain and common emitter test 5 11 Figure 5 9 Typical common emitter c...

Страница 14: ...3 Channel to channel isolation test summary 6 10 Table 6 4 Differential and common mode isolation testing 6 13 Table 6 5 Recommended troubleshooting equipment 6 17 Table 6 6 Troubleshooting procedure...

Страница 15: ...21 has two pole independent 1 12 and 1 18 multiplex banks and ten independent inputs and outputs for both multiplexer and digital I O capabilities Some of the key features include Low contact potentia...

Страница 16: ...y or death Always read the associated information very carefully before per forming the indicated procedure The CAUTION heading used in this manual explains haz ards that could damage the card Such da...

Страница 17: ...the unit in its original packing carton or the equivalent and include the following information Advise as to the warranty status of the card Write ATTENTION REPAIR DEPARTMENT on the shipping label Fi...

Страница 18: ...B Bank A 3 Note Factory configuration shown Bank to Bank Jumpers HI LO HI LO Backplane Jumpers to 7001 7002 Analog Backplane 1 HI LO Jumpers HI LO A B Switching Topology for all Channels HI LO Input 1...

Страница 19: ...he multiplex banks of one card connect to the multiplex banks of a second card through the analog backplane of the Model 7001 7002 main frame which expands the number of inputs With the jump ers remov...

Страница 20: ...emes The following paragraphs describe some basic switching schemes that are possible with a two pole switching multi plexer These switching schemes include some various shielding configurations to he...

Страница 21: ...can be configured to use instruments that have sensing capability The main advantage of using sensing is to cancel the effects of switch card path resistance 1 25 and the resistance of external cablin...

Страница 22: ...ystem mainframe can accommodate up to ten cards And by connecting up to six Model 7002 mainframes 60 cards can be configured The limits on the number of cards in the Model 7001 7002 are due to trigger...

Страница 23: ...me By leaving the backplane jumpers installed the multiplex banks of the card installed in slot 1 CARD 1 are automatically connected to the multiplex banks of the card installed in slot 2 CARD 2 throu...

Страница 24: ...stalled in an ad jacent slot Figure 2 12 shows a possible switching system using a ma trix and a multiplexer The backplane jumpers for both the matrix and multiplexer must be installed This allows mat...

Страница 25: ...001 7002 switch system are due to triggering Section 4 explains how to connect a test system using two mainframes 1 2 3 4 Columns 7022 Rows Card 1 5x6 Matrix 7021 Card 2 Dual 1x12 and 1x18 Mux Bank A...

Страница 26: ...Refer to Section 4 to configure the logic to your requirement Controlling pull up devices Typically the digital outputs are used to provide drive for rel atively high current devices such as solenoid...

Страница 27: ...s to high impedance devices i e logic devices internal pull up resistors are used to achieve the appropriate logic level Figure 3 2 shows the output con figuration using the 10k pull up resistor RP Th...

Страница 28: ...channel the input is pulled high to 5V which displays the channel as on When the resistor is connected to ground the channel is pulled low Thus with nothing connected to the channel the input is pull...

Страница 29: ...Digital I O Configuration 3 4 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 30: ...rd and two mainframe system configurations Typical digital I O connection schemes Provides some typical connection schemes for output solenoid relay motor and logic device control and for input micro...

Страница 31: ...he backplane row jumpers 1 If mated together separate the relay card from the con nector card by removing the mounting screw and then pulling the two cards away from each other Remember to only handle...

Страница 32: ...ion 2 Refer to Figure 4 2 to determine which jumpers to in stall or remove 3 Using Figure 4 3 as a guide install the jumpers on or remove the jumpers from the appropriate terminal pairs Figure 4 3 Ban...

Страница 33: ...nector card by removing the mounting screw and then pulling the two cards away from each other Remember to only handle the cards by the edges and shields to avoid contamination 2 Locate J101 on the r...

Страница 34: ...y the edges and shields to avoid contamination Keithley has a variety of cable and connector accessories available to accommodate connections from the connector card to test instrumentation and DUTs d...

Страница 35: ...annel 24 58 26b H L 31 31a Channel 29 92 28c H L 30 30a Channel 30 62 30b H L Output 64 32b 32 32a H L 43 11b Channel 1 75 11c H L 13 13a Channel 2 74 10c H L 14 14a Channel 6 46 14b H L 47 15b Channe...

Страница 36: ...n 7 HI 15b 47 Chan 22 HI 25b 57 DIG OUT 39 6c 70 Chan 7 LO 15c 79 Chan 22 LO 25c 89 DIG OUT 40 8c 72 Bank B Chan 8 HI 17a 17 Bank B Chan 23 HI 27a 27 DIG IN 1 3a 3 Chan 8 LO 14c 78 Chan 23 LO 24c 88 D...

Страница 37: ...via the main frame backplane from appearing on the pins of the male DIN connector The output relays will only close when the Model 7011 MTC 2 cable assembly is connected to the card If building your...

Страница 38: ...o of these cables can be used to provide 100 conductors The connector has solder cups to accommodate the individ ual wires of the unterminated cable Figure 4 12 provides an exploded view of the connec...

Страница 39: ...using the Model 7011 MTC 2 round cable assembly This cable mates direct ly to both the external bulkhead connector and the Model 7021 Notice that the bulkhead connector is shown mounted to a fixture t...

Страница 40: ...er system Each card is configured as a single 1 30 multiplexer To accomplish this all bank to bank jumpers both cards are installed to connect banks A and B together By leaving the backplane jumpers o...

Страница 41: ...ltiplexer system Each card is configured as a single 1 30 multiplexer To accomplish this bank to bank jumpers of all three cards must be installed to connect banks A and B together By leaving the back...

Страница 42: ...tions to external circuitry A suitable round cable can be terminated with a 96 pin female DIN connector Model 7011 KIT R with two lengths of Hitachi cable P N N2807 P D 50TAB This cable contains 50 co...

Страница 43: ...0 1 30 31 60 Simplified Equivalent Circuit Card 2 1x30 7001 7002 Analog Backplane Card 1 1x30 Single 1x90 Multiplexer Notes 1 Backplane jumpers for both cards installed in 7001 7002 1 must be installe...

Страница 44: ...ecessary voltage level A motor is turned on when the corresponding output channel is turned on closed Figure 4 17 Digital output motor control Logic device control Figure 4 18 shows a digital output c...

Страница 45: ...on the Model 7002 With a switch open and the input resistance configuration set to pull down as shown in Figure 4 19B the corresponding input channel is pulled low by the internal input resistor As a...

Страница 46: ...upplied 4 40 screw at the end of the card to secure the assembly Make sure to handle the cards by the edges and shields to prevent contamination 2 Facing the rear panel of the mainframe select the slo...

Страница 47: ...nd Installation 4 18 ber to handle the card by the edges and shields to avoid contamination that could degrade performance Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artis...

Страница 48: ...relays never exceed the following maximum signal levels 110V DC or rms 155V peak between any two inputs or chassis 1A switched 30VA resistive load Digital I O maximum signal levels To ensure proper op...

Страница 49: ...on 4 Input channels use positive true logic but can be configured to pull up or pull down Thus a channel can be pulled high or pulled low when the input is open depending on the jumper configuration I...

Страница 50: ...16 B 17 B 18 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 2 14 2 15 2 16 2 17 2 18 2 19 2 20 2 21 2 22 2 23 2 24 2 25 2 26 2 27 2 28 2 29 2 30 2 31 2 32 2 33 2 34 2 35 2 36 2 37 2 38 2 39...

Страница 51: ...ls paragraph However the scan list is specified from the SCAN CHANNELS display mode The SCAN LIST key toggles between the channel list and the scan list The following shows an example of a scan list S...

Страница 52: ...tput 07 open all Scanning output channels There are many commands associated with scanning How ever it is possible to configure a scan using as little as four commands These commands are listed as fol...

Страница 53: ...card installed in slot 1 PRINT 1 output 07 sens2 data 3 PRINT 1 enter 07 LINE INPUT 2 A PRINT A The first statement reads input channel 3 slot 1 The second statement addresses the mainframe to talk se...

Страница 54: ...re cards Accuracy of measurements can be optimized by minimizing stray resistance Make connecting wires as short as possible to minimize path resistance Another technique is to short one of the multip...

Страница 55: ...wo poles of switching are required for each resistor tested For this reason only 12 re sistors per card can be tested using this configuration be cause two channels must close at the same time Figure...

Страница 56: ...measurement accuracy unless steps are taken to avoid them The Model 7021 has been designed to keep relay EMF at a minimal level Thermal EMF effects can be virtually eliminated by taking two voltage m...

Страница 57: ...measuring the collector current IC The DC common emitter current gain of the transistor is then determined as follows Figure 5 8 shows the test configuration and equivalent cir cuit for the current ga...

Страница 58: ...current range on the Model 2000 DMM Doing so will result in the loss of one or two decades of resolution but 3 1 2 or 4 1 2 digit resolution will probably be adequate for most situations HI LO POWER...

Страница 59: ...test capabilities of that system The follow ing paragraphs discuss an overall multiplexer matrix switching system and also briefly outline a typical test that can be made with such a system Multiplex...

Страница 60: ...th the equivalent resistance of the DUT as shown in Figure 5 11 For low to medium device resistance values path isolation resistance is seldom a consideration however it can seriously degrade measurem...

Страница 61: ...sources as in the case of arcing in high volt age environments In either case the effect on the measure ment can be considerable if enough of the unwanted signal is present RFI can be minimized in se...

Страница 62: ...esent in the air can be deposited on the insulator surface To avoid these problems never touch the connector insulat ing material In addition the multiplexer digital I O card should be used only in cl...

Страница 63: ...Operation 5 16 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 64: ...recautions Handling and cleaning precautions Because of the high impedance areas on the Model 7021 care should be taken when handling or servicing the card to prevent possible contamination which coul...

Страница 65: ...y of less than 70 Recommended equipment Table 6 1 summarizes the equipment necessary for perfor mance verification along with an application for each unit Multiplexer connections The following informa...

Страница 66: ...n bank A inputs It is recommended that the physical connections be made at the inputs of bank A as shown in Figure 6 1 7 Connect INPUT LO and INPUT 4 WIRE LO to the HI H terminal of bank A 8 Install t...

Страница 67: ...ain frame 6 Turn on the Model 7001 7002 7 Program the unit to close channel 1 1 bank A input 1 8 On the Model 6517A disable zero check and allow the reading to settle Verify that the reading is 100pA...

Страница 68: ...L B Common Mode Bank Inputs Model 7021 WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL O...

Страница 69: ...n ternal offsets Leave REL READING enabled for the entire procedure 11 Turn off the mainframe Remove the Model 7021 from slot 1 Cut the short on bank B output HI to LO 12 Install the Model 7021 in mai...

Страница 70: ...tion changes 5 Place the Model 6517A in the R measurement function 6 Turn on and program the Model 7001 7002 to close chan nels 1 1 and 1 4 bank A input 1 and bank B input 4 7 On the Model 6517A sourc...

Страница 71: ...6 5 Channel to channel isolation test connections Model 7021 Bank Outputs Bank Inputs A H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L B H L H L Model 6517A Note Setup shown i...

Страница 72: ...k A Input 12 to Bank B Input 13 Bank A and Bank B 1 12 and 1 13 7 Bank A Input 16 to Bank B Input 14 Bank A and Bank B 1 16 and 1 14 8 Bank A Input 17 to Bank B Input 15 Bank A and Bank B 1 17 and 1 1...

Страница 73: ...nk B Input 5 Bank B Input 5 to Bank B Input 8 Bank B Input 8 to Bank B Input 9 Bank B Input 9 to Bank B Input 10 Bank B Input 10 to Bank B Input 13 Bank B Input 13 to Bank B Input 14 Bank B Input 14 t...

Страница 74: ...in slot 1 CARD 1 and turn on the mainframe 7 Make sure all the relays are open 8 On the Model 6517A source 100V 9 After allowing the reading on the Model 6517A to settle verify that it is 1G 109 This...

Страница 75: ...L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L B H L H L Model 6517A Note Setup shown is configured to test isolation between Bank A and chassis ground WARNING NO INTERNAL OPERATOR...

Страница 76: ...ese devices will be received in anti static containers made of plastic or foam Keep these parts in their original containers until ready for in stallation or use 2 Remove the devices from their protec...

Страница 77: ...n information multiplexer relay drivers and relays and digital I O output channel drivers and digital I O input channel registers These various elements are dis cussed in the following paragraphs Figu...

Страница 78: ...ig nal it receives 4 Once all data is received the mainframe sends a stop command which is a low to high transition of the ID DATA line with the IDCLK line held high Figure 6 10 Multiplexer relay cont...

Страница 79: ...n put channel registers U102 contains eight channels and U101 contains two channels When the digital inputs are read the STROBE line goes high to latch the input channel information The INCLOCK line t...

Страница 80: ...ering tool such as a solder sucker to clear each mounting hole completely free of solder Each relay pin must be free to move in its mounting hole before removal Also make certain that no burrs are pre...

Страница 81: ...e 6 U110 pin 6 IDCLK pulses During power up only 7 U110 pin 5 IDDATA pulses During power up only 8 U106 pin 7 STROBE pulse End of relay update sequence 9 U106 pin 2 CLK pulses During relay update sequ...

Страница 82: ...er 7021 2 Card serial number 3 Part description 4 Circuit description if applicable 5 Keithley part number Factory service If the card is to be returned to Keithley Instruments for repair perform the...

Страница 83: ...EJECTOR ARM 7011 301B IC SERIAL EPROM 24C01P IC 737 ROLL PIN FOR EJECTOR ARMS DP 6 1 SHIELD 7011 305C STANDOFF 2 CLEARANCE ST 204 1 C100 112 114 115 118 121 122 125 CAP 0 1 F 20 50V CERAMIC C 365 1 C1...

Страница 84: ...ERIAL IN LATCH DRIVER 5841A IC 536 U110 EPROM PROGRAM 7021 800A01 U111 IC HEX INVERTER 74HCT04 IC 444 U112 IC QUAD 2 INPUT OR 74HCT32 IC 443 U113 IC HIGH SPEED BUFFER 74HC125 IC 451 U114 IC RETRIG MON...

Страница 85: ...ONN BERG CS 339 J202 203 CONN SHIM 7011 309A J1004 CONN 96 PIN 3 ROW CS 514 K201 202 RELAY ULTRA SMALL POLARIZED TF2E 4 5V RL 162 P1002 1003 CONNECTOR 48 PIN 3 ROW CS 748 3 Q201 TRANS NPN SILICON 2N39...

Страница 86: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 87: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 88: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 89: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 90: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 91: ...THLEY INSTRUMENTS INC KEITHLEY DO NOT SCALE THIS DRAWING APPR D R N SCALE DATE P G TITLE NO C DATE ENG REVISION ECA NO LTR 1 1 A B C D D C B A 4 3 2 4 3 2 CAB 1 6 97 1 1 COMPONENT LAYOUT CONNECTOR BOA...

Страница 92: ...NA FILE 7021 174 06 01A 7021 175 06A 0 6 PTH 010 025 010 007 003 SEE NOTE 7 SIDE 01 SEE NOTE 8 SIDE 01 SOLDERMASK ARTWORK CONTAINS SELECTED AREAS OF SOLDERMASK RELIEF ON GUARD TRACES SEE NOTE 9 SIDE...

Страница 93: ...l tests 6 6 Controlling devices using pull up resistors 3 2 Controlling pull up devices 3 1 Current gain tests 5 10 D Differential and common mode isolation tests 6 11 Differential switching 2 4 Digit...

Страница 94: ...terference 5 14 Reading digital I O input channels 5 6 Reading input channels 5 4 Recommended equipment 6 2 Repacking for shipment 1 3 Resistor testing 5 6 S Safety symbols and terms 1 2 Scanning chan...

Страница 95: ...libration only Certi cate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement system including all instruments connected whether po...

Страница 96: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...

Страница 97: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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