Keithley 7012-C Instruction Manual Download Page 55

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Operation

4-9

Figure 4-6
Voltage divider checks

Model 196

Output

Common

Model 230

Measure V

Source V

Model 7012

196

230

+/-

Equivalent Circuit

Sense Output

Sense Common

R 2

R 3

Thick Film

R 2

R 3

Rows

R 4

X = Closed Crosspoints

Cols

R 4

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Summary of Contents for 7012-C

Page 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 Demos In stock Ready to ship TAR certified secure asset solutions Expert team I Trust guarantee I 100 satisfaction All trademarks brand names and brands appearing herein are the property of their respect...

Page 2: ...Manual Contains Operating and Servicing Information Models 7012 S and 7012 C 4 10 Matrix Cards 7012 901 01 Rev B 11 93 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 3: ...T INDIRECT SPECIAL INCIDENTAL 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 LIM ITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON OR DAMAGE TO PROPERTY Keithley Instruments In...

Page 4: ...ls 7012 S and 7012 C Instruction Manual 1991 Keithley Instruments Inc All Rights Reserved Cleveland Ohio U S A Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 5: ...Aurora Road Cleveland OH 44139 Technical Support 1 888 KEITHLEY Monday Friday 8 00 a m to 5 00 p m EST Fax 440 248 6168 Visit our website at http www keithley com Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 6: ... manual Each new Revi sion includes a revised copy of this print history page Many product updates and revisions do not require manual changes and conversely manual corrections may be done without accompanying product changes Therefore it is recommended that you review the Manual Update History Revision A Document Number 7012 901 01 November 1991 Addendum A Document Number 7012 901 02 January 1992...

Page 7: ... hazardous voltage is present 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 Product users in these circumstances must be trained to protect themselves fro...

Page 8: ...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 the line cord and all test cables To maintain protection from electric shock and fire replacement components in mains circuits including the power transformer test leads an...

Page 9: ...ny pin to chassis CONTACT LIFE Cold Switching 108 closures At Maximum Signal Levels 105 closures CHANNEL RESISTANCE per conductor 1Ω CONTACT POTENTIAL 7012 S 500 nV per contact pair Hi Lo 1 5 µV per single contact 7012 C 1 µV per contact pair Hi Lo 3 µV per single contact OFFSET CURRENT 100 pA ACTUATION TIME 3 ms ISOLATION Path 109Ω 50 pF Differential 109Ω 200 pF Common Mode 109Ω 400 pF CROSS TALK...

Page 10: ...ngle ended switching 2 3 2 3 2 Differential switching 2 4 2 3 3 Sensing 2 4 2 3 4 SMU connections 2 5 2 4 Matrix expansion 2 5 2 4 1 Two card switching systems 2 5 2 4 2 Mainframe matrix expansion 2 9 3 1 Introduction 3 1 3 2 Handling precautions 3 1 3 3 Connections 3 1 3 3 1 Backplane row jumpers 3 2 3 3 2 Screw terminal connector card 3 2 3 3 3 Multi pin mass termination connector card 3 4 3 4 T...

Page 11: ... Recommended equipment 5 2 5 3 3 Matrix card connections 5 3 5 3 4 Channel resistance tests 5 3 5 3 5 Offset current tests 5 4 5 3 6 Contact potential tests 5 6 5 3 7 Path isolation tests 5 7 5 3 8 Differential and common mode isolation tests 5 9 5 4 Special handling of static sensitive devices 5 11 5 5 Principles of operation 5 12 5 5 1 Block diagram 5 12 5 5 2 ID data circuits 5 13 5 5 3 Relay c...

Page 12: ...or pinout 3 8 Figure 3 8 Model 7011 KIT R with cable assembly 3 8 Figure 3 9 Single card system example multi pin connector card 3 10 Figure 3 10 Single card system example screw terminal connector card 3 11 Figure 3 11 Two card system example multi pin connector card 3 12 Figure 3 12 Two card system example screw terminal connector card 3 13 Figure 3 13 Two mainframe system example multi pin conn...

Page 13: ...igure 5 2 Common mode offset current testing 5 5 Figure 5 3 Differential offset current testing 5 5 Figure 5 4 Contact potential testing 5 6 Figure 5 5 Path isolation testing guarded 5 8 Figure 5 6 Differential isolation testing 5 10 Figure 5 7 Common mode isolation testing 5 10 Figure 5 8 Model 7012 block diagram 5 12 Figure 5 9 Start and stop sequences 5 13 Figure 5 10 Transmit and acknowledge s...

Page 14: ... 2 Table 5 2 Path isolation tests 5 8 Table 5 3 Differential and common mode isolation testing 5 11 Table 5 4 Recommended Troubleshooting Equipment 5 15 Table 5 5 Troubleshooting procedure 5 16 v vi Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 15: ...e made via the 96 pin male DIN connector on the connector card Keithley offers a variety of optional accessories that can be used to make connections to the connector card see paragraph 1 9 The rest of Section 1 is arranged in the following man ner 1 2 Features 1 3 Warranty information 1 4 Manual addenda 1 5 Safety symbols and terms 1 6 SpeciÞcations 1 7 Unpacking and inspection 1 8 Repacking for ...

Page 16: ... in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading used in this manual explains hazards that could damage the matrix card Such dam age may invalidate the warranty 1 6 Specifications Model 7012 speciÞcations are found at the front of this manual These speciÞcations are exclusive of the ma trix mainframe sp...

Page 17: ...e following accessories are available for use with the Model 7012 Model 7012 ST This screw terminal connector card is identical to the one provided with the Model 7012 S assembly An extra screw terminal connector card al lows you to wire a second test system without disturb ing the wiring conÞguration of the Þrst connector card Model 7011 KIT R This connection kit includes a 96 pin female DIN conn...

Page 18: ...igure 2 1 The card is conÞgured as a 4 10 matrix Each of the 40 crosspoints is made up of a two pole switch By closing the appropriate crosspoint switch any matrix row can be connected to any col umn in the matrix Backplane jumpers Notice in Figure 2 1 there are four pairs of backplane jumpers located on the relay card With the jumpers in stalled the matrix card is connected to the analog back pla...

Page 19: ...mpers isolates the card from the backplane and subsequently any card installed in the other slot For information on removing the jumpers refer to paragraph 3 3 1 NOTE The Model 7001 does not provide an analog backplane for the non 701X se ries cards As a result anyone of these cards installed in one slot in the main frame is electrically isolated from any card installed in the other slot The only ...

Page 20: ...more effective connected to circuit common Chassis ground is accessible at the rear panel of the Model 7001 2 3 1 Single ended switching In the single ended switching conÞguration the source or measure instrument is connected to the DUT through a single pathway as shown in Figure 2 4 Figure 2 4 Single ended switching example Source or Measure Row Columns 7012 H L HI LO DUT Optional Shield Figure 2...

Page 21: ... the matrix card can be conÞg ured to use instruments that have sensing capability The main advantage of using sensing is to cancel the ef fects of matrix card path resistance 1Ω and the resis tance of external cabling Whenever path resistance is a consideration sensing should be used Figure 2 5 Differential switching example HI LO Source or Measure Rows Columns 7012 H L H L DUT Figure 2 6 Sensing...

Page 22: ...e LO Output LO Output LO 236 237 238 Triax Cables 3 WARNING Hazardous voltages may be present on GUARD Make sure all cable shields are properly insulated before applying power 2 3 4 SMU connections Figure 2 7 shows how a Keithley Model 236 237 or 238 Source Measure Unit could be connected to the matrix card By using triax cables that are unterminated at one end the driven guard and chassis ground ...

Page 23: ...ed by simply installing two as shipped Model 7012s in the Model 7001 mainframe By leaving the backplane jumpers installed the rows of the matrix card installed in slot 1 CARD 1 are automatically connected to the rows of the matrix card installed in slot 2 CARD 2 through the analog backplane The 4 20 matrix is shown in Figure 2 9 Figure 2 8 Two separate 4 10 matrices 1 2 3 4 1 10 Columns 7012 Rows ...

Page 24: ...lane Card 1 Notes Backplane jumpers on both cards must be installed 11 20 7012 Card 2 4 x 20 Matrix Columns could have a Model 7012 matrix card installed in one slot and a Model 7011 multiplexer card installed in the other slot Figure 2 11 shows a possible switching system using a matrix card and a multiplexer card The backplane jumpers for both the matrix and multiplexer cards must be installed T...

Page 25: ...rix example 8 10 1 2 3 4 1 10 Columns 7012 Rows 7001 Analog Backplane Card 1 8 x 10 Matrix 7012 Card 2 1 2 3 4 Rows Jumpers Removed External Column Jumpers Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 26: ...ne jumpers must be installed 2 Model 7011 bank to bank jumpers must be removed 1 10 7011 Card 2 Quad 1 x 10 Mux 1 10 1 10 1 10 Bank A Bank B Bank C Bank D Inputs An example of a partially implemented 8 20 matrix is shown in Figure 2 12 The partial matrix is still consid ered 8 20 but contains only 120 crosspoints using three Model 7012 matrix cards installed in two Model 7001 mainframes Matrix car...

Page 27: ...ows 5 6 7 or 8 Figure 2 12 cannot be connected to a column of Model 7012 1 with one ac cidental crosspoint closure Three speciÞc crosspoints must be closed in order to route the source signal to a column of card 1 Figure 2 12 Partial matrix expansion 8 20 1 2 3 4 Rows 1 Columns 7012 1 10 7001 1 External Row Jumpers 11 Columns 7012 2 20 7001 2 7012 3 5 6 7 8 Rows Artisan Scientific Quality Instrume...

Page 28: ...sembly in the Model 7001 mainframe 3 2 Handling precautions To maintain high impedance isolation care should be taken when handling the relay card to avoid contami nation from such foreign materials as body oils Such contamination can substantially lower leakage resis tances thus degrading performance To avoid possible contamination always grasp the re lay and connector cards by the side edges or ...

Page 29: ...e PC board Using a pair of wire cutters cut one lead of each jumper Jumper installation Referring to Figure 3 1 for jumper locations perform the following steps to install backplane row jumpers 1 If mated together separate the relay card from the connector 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 shie...

Page 30: ...amp B Using your thumb and foreÞnger press the re taining clips inward and with your other hand remove the top half of the clamp 4 Route wires under wire guide connector shim 5 Route the wires through the bottom half of the ca ble clamp 6 Replace the top half of the clamp It simply snaps onto the bottom half of the clamp Tighten the ca ble clamp screw The clamp serves as a strain relief for termin...

Page 31: ...ctor card is provided by Figure 3 5 This connector will mate to a 96 pin female DIN con nector Keithley has a variety of cable and connector accesso ries available to accommodate connections from the connector card to test instrumentation and DUT de vices under test In general these accessories which are summarized in Table 3 1 utilize a round cable as sembly for connections Table 3 1 Mass termina...

Page 32: ...minal Connector Desig 1a 32c Schematic Desig 1 96 Matrix Terminal Connector Desig 1a 32c Schematic Desig 1 96 Row 1 HI LO 8c 8b 72 40 Col 1 HI LO 32c 32b 96 64 Row 2 HI LO 6c 6b 70 38 Col 2 HI LO 30c 30b 94 62 Row 3 HI LO 4c 4b 68 36 Col 3 HI LO 28c 28b 92 60 Row 4 HI LO 2c 2b 66 34 Col 4 HI LO 26c 26b 90 58 Col 5 HI LO 24c 24b 88 56 Col 6 HI LO 22c 22b 86 54 Col 7 HI LO 20c 20b 84 52 Col 8 HI LO ...

Page 33: ...ished using a Model 7011 MTC 2 cable and a Model 7011 MTR bulk head connector The two meter round cable is termi nated with a 96 pin female DIN connector at each end This cable mates directly to the multi pin connector card and to the bulkhead connector The bulkhead con nector has solder cups to allow direct connection to in strumentation and DUT Figure 3 7 provides pinout for the bulkhead connect...

Page 34: ...bled Wire instrumentation and DUT to bulkhead connector See Figures 3 5 and 3 7 for terminal identification B 7011 MTC 2 Cut in Half Wire directly to instrumentation and DUT Multi Pin Connector Card C Cable Wire directly to instrumentation and DUT 7011 Kit R Connector Kit Cable Hitachi p n N2807 P D 50TAB is a 50 conductor cable Two of these cables can be used to supply 100 conductors Artisan Scie...

Page 35: ...ide of connector 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 a b c Note See Figure 3 5 for terminal identification Figure 3 8 Model 7011 KIT R with cable assembly Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 36: ... When using a single card system make sure that the card remains electrically isolated from any other switching cards There are several ways to ensure iso lation for a single card in the Model 7001 mainframe 1 Vacate the other mainframe slot If there is a Model 701X card installed in the other slot remove it 2 Remove the backplane jumpers on the matrix card This will disconnect the card from the a...

Page 37: ...rument Instrument Instrument Row 1 Row 2 Row 3 Row 4 DUT 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 1 2 3 4 Instruments Equivalent Circuit Columns Rows Fixture for Bulkhead Connector 7011 MTR Bulkhead Connector 7011 MTC 2 Cable Assembly 28 Individual Conductors Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 38: ...T Test Fixture 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 1 2 3 4 Instrument Instrument Instrument Instrument Instruments Equivalent Circuit Columns Rows Row 1 Row 2 Row 3 Row 4 7012 S Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 39: ... 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 1 2 3 4 Instruments Backplane Row Jumpers installed Column Column CARD 1 CARD 2 Equivalent Circuit Note Backplane row jumpers for both matrix cards must be installed Instrument Instrument Instrument Instrument Row 1 Row 2 Row 3 Row 4 7011 MTC 2 Cable Assembly Cut in half to provide two cables Row Artisan Scientific Quality Instrum...

Page 40: ...ane DUT 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 1 2 3 4 Note Backplane row jumpers for both cards must be installed Instruments Backplane Row Jumpers installed Column Column CARD 1 CARD 2 Equivalent Circuit Row Instrument Instrument Instrument Instrument Row 1 Row 2 Row 3 Row 4 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOUR...

Page 41: ...ation and DUT Notice that the row connections for the third matrix card are made at the instruments Figure 3 14 shows connections for the screw terminal connector card Single conductor connections are made directly from the screw terminals of the connector card to instrumentation and DUT 3 5 Model 7012 installation and re moval This paragraph explains how to install and remove the Model 7012 matri...

Page 42: ... Backplane Row Jumpers installed Column Column Column CARD 1 CARD 2 CARD 3 Equivalent Circuit External Row Jumpers Row DUT Test Fixture 1 2 3 4 5 6 7 8 9 10 DUT Test Fixture 1 2 3 4 5 6 7 8 9 10 Instrument Instrument Instrument Instrument 7011 MTC 2 Cable Assembly Cut in half to provide two cables C A R D 1 C A R D 2 7012 C 7012 C I N O U T Trigger Link 7001 2 DUT Test Fixture 1 2 3 4 5 6 7 8 9 10...

Page 43: ...T 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 DUT 1 2 3 4 5 6 7 8 9 10 1 2 3 4 Trigger Link Cable Note Backplane row jumpers for both cards in 7001 1 must be installed 7001 1 7001 2 Instruments Backplane Row Jumpers installed Column Column Column CARD 1 CARD 2 CARD 3 Equivalent Circuit External Row Jumpers Row I N O U T Trigger Link C A R D 1 C A R D 2 7012 S 7012 S DUT Test Fixture 1 2 3 4 5 6 ...

Page 44: ... to install the card in 3 Referring to Figure 3 15 for Model 7012 S installa tion or Figure 3 16 for Model 7012 C installation feed the matrix card assembly into the desired slot such that the edges of the relay card ride in the rails 4 With the ejector arms in the unlocked position push the card assembly all the way into the main frame until the arms engage into the ejector cups Then push both ar...

Page 45: ... 3 18 Figure 3 15 Model 7012 S card installation in Model 7001 Lock card Unlock card Ejector Arms 2 Lock card Unlock card Ejector Arms 2 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 46: ...6 Model 7012 C card installation in Model 7001 1 Screw 2 Unlock card 2 1 Lock card Screw Ejector Arms 2 Screw Unlock card Ejector Arms 2 Screw Lock card Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 47: ...al level speciÞcations of the card Maximum signal levels To prevent overheating or damage to the relays never exceed the following maximum signal levels DC signals 110V between any two pins termi nals 1A switched 30VA resistive load AC signals 125V rms or 175V AC peak be tween any two pins terminals 1A switched 60VA resistive load 4 3 Mainframe control of matrix card The following information pert...

Page 48: ...CARD 1 CARD 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 Open Channel Closed Channel 7001 Display 4 3 1 Channel assignments The Model 7001 has a channel status display Figure 4 1 that provides the real time state of each available channel The left portion of the display is for slot 1 Card 1 and the right portion is for slot 2 Card 2 Notice that the matrix organization of the channel sta tus display...

Page 49: ... 1 4 3 1 1 4 1 2 4 1 3 4 1 4 4 1 1 5 1 2 5 1 3 5 1 4 5 1 1 6 1 2 6 1 3 6 1 4 6 1 1 7 1 2 7 1 3 7 1 4 7 1 1 8 1 2 8 1 3 8 1 4 8 1 1 9 1 2 9 1 3 9 1 4 9 1 1 10 1 2 10 1 3 10 1 4 10 1 2 3 4 5 6 7 8 9 10 B Slot 2 Card 2 2 1 1 2 2 1 2 3 1 2 4 1 2 1 2 2 2 2 2 3 2 2 4 2 2 1 3 2 2 3 2 3 3 2 4 3 2 1 4 2 2 4 2 3 4 2 4 4 2 1 5 2 2 5 2 3 5 2 4 5 2 1 6 2 2 6 2 3 6 2 4 6 2 1 7 2 2 7 2 3 7 2 4 7 2 1 8 2 2 8 2 3 ...

Page 50: ...ng shows an ex ample of a scan list SCAN CHANNELS 2 1 1 2 1 3 2 2 1 2 2 5 When a scan is performed the channels speciÞed in the scan list will be scanned in the order that they are pre sented in the scan list A manual scan can be performed by using the RESET default conditions of the Model 7001 RESET is selected from the SAVESETUP menu of the main MENU When RESET is performed the mainframe is conÞ...

Page 51: ...ne 25 to slow down the scan Also Line 5 is added to the beginning of the program to ensure that all chan nels are open before the scan is started 5 OUTPUT 707 open all 10 OUTPUT 707 RST 20 OUTPUT 707 trig seq coun auto on 25 OUTPUT 707 trig del 0 25 30 OUTPUT 707 scan 1 1 1 1 4 10 40 OUTPUT 707 INIT 50 END Line 5 Opens all channels Line 25 Sets a 1 4 second delay after each channel closes 4 4 Matr...

Page 52: ... testing 1 2 3 4 H 1 3 4 5 6 7 8 9 10 2 R1 R2 R3 R4 R1 R2 R4 R3 Model 230 Model 196 Ohms Sense Volts Ohms Volts Ohms HI Output Common Measure V or 4 terminal Ω Source V Ohms Sense HI Volts Ohms LO Ohms Sense LO TF 1 TF 2 Sense Output Sense Common L H L H L H L H L H L H L H L H L H L Rows H L H L H L H L Cols 7012 The effects of thermal EMFs generated by relay con tacts and connections can be canc...

Page 53: ... Volts Ohms HI Ohms Sense HI Ohms Sense LO Volts Ohms LO H L 1 H L 2 H L 3 H L 4 H L H L 1 2 R1 R2 R3 H L L H H L H L 196 Equivalent Circuit Ω R4 H L 5 X X X Closed Crosspoints Rows Cols R4 H L Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 54: ... and 3V ranges 1GΩ 30V range 11MΩ 300V range 10 1MΩ For better input impedance re quirements the Keithley Model 617 Electrometer can be incorporated into the test system to measure volt age Another factor to be considered when checking low voltage dividers is thermal EMFs generated by the ma trix card The Model 7012 has been designed to keep relay EMF at a minimal level A matrix card crosspoint ca...

Page 55: ...ce V H 1 2 Model 7012 3 V 196 230 Equivalent Circuit 4 L Sense Output Sense Common R1 R2 R3 Thick Film H L H L H L H L H L H L H L R1 R2 R3 H H H H 1 2 3 4 Rows H L 5 R4 X X X X X Closed Crosspoints Cols R4 H Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 56: ...can be expand ed to test more by simply using additional Model 7012 matrix cards The Model 7001 will accommodate two matrix cards Daisy chaining six Model 7001s expands the system to 12 matrix cards allowing 36 or more tran sistors to be tested NOTE The Model 7012 is a general purpose matrix card and cannot be used to check FETs or transistors that have high gain or low power To test these devices...

Page 57: ... Law as follows Gain IC IB IE IC IB Common emitter characteristic curves A proÞle of the transistor operating characteristics can be obtained by measuring the collector current over a speciÞed voltage range VCE for different base bias currents IB For example Figure 4 9 shows the charac teristics of a typical NPN silicon transistor at base bias currents IB of 20µA 40µA 60µA and 80µA Extensive trigg...

Page 58: ...1 Source I Measure V Output HI Sense HI Sense LO Output LO SMU 2 A Measure I Source V V Measure V Source I H L H L H L 7012 Rows X X X X X Closed Crosspoint Equivalent Circuit A V SMU 2 SMU 1 IC I B VBE I E 1 2 3 4 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 59: ...dom a con sideration however it can seriously degrade measurement accuracy when testing high impedance devices The voltage measured across such a device for example can be substantially attenuated by the volt age divider action of the device source resistance and path isolation resistance as shown in Figure 4 11 Also leakage currents can be generated through these resis tances by voltage sources i...

Page 60: ...c interference over a wide range of frequencies across the spectrum Such RFI can be particularly troublesome at low signal lev els but is can also affect measurements at high levels if the problem is of sufÞcient severity RFI can be caused by steady state sources such as radio or TV signals or some types of electronic equipment microprocessors high speed digital circuits etc or it can result from ...

Page 61: ...ion resistance will be substantial ly reduced affecting high impedance measurement paths Oils and salts from the skin can contaminate connector insulators reducing their resistance Also contami nants present in the air can be deposited on the insula tor surface To avoid these problems never touch the connector insulating material In addition the multi plexer card should be used only in clean dry e...

Page 62: ...Operation 4 16 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 63: ...cuits on the Model 7012 care should be taken when handling or servicing the card to prevent possible contamination which could degrade performance The following precau tions should be taken when handling the matrix card Do not store or operate the card in an environment where dust could settle on the circuit board Use dry ni trogen gas to clean dust off the card if necessary Handle the card only b...

Page 64: ...E Failure of any performance veriÞca tion test may indicate that the matrix card is contaminated See paragraph 5 2 to clean the card 5 3 1 Environmental conditions All veriÞcation measurements should be made at an ambient temperature between 18 and 28 C and at a relative humidity of less than 70 5 3 2 Recommended equipment Table 5 1 summarizes the equipment necessary for per formance veriÞcation a...

Page 65: ... test the high H terminal of row 1 through crosspoints 1 1 through 1 12 Rows Columns 5 3 3 Matrix card connections The following information summarizes methods that can be used to connect test instrumentation to the two connector cards Detailed connection information is provided in Section 3 Model 7012 S Instrumentation can simply be hard wired directly to the screw terminals of the connector card...

Page 66: ... from high H to low L differential and from high H and low L to chassis common mode for each pathway In general these tests are performed by simply measuring the leakage current with an electrometer In the following procedure the Model 617 is used to measure leakage current Referring to Figure 5 2 perform the following proce dure to check offset current 1 Turn the Model 7001 off if it is on 2 Conn...

Page 67: ...L H L H L H L H L H L H L H L H L H L Chassis ground is accessible at rear panel of the 7001 Figure 5 3 Differential offset current testing 1 2 3 4 1 3 4 5 6 7 8 9 10 2 Model 7012 MODEL 617 Measure Current INPUT HI LO Note Setup shown is configured to test Row 1 pathways for offset current Model 7025 Unterminated Triax Cable Rows Columns 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 Arti...

Page 68: ... 3 4 5 6 7 8 9 10 2 Model 7012 HI LO Note Setup shown is configured to test Row 1 crosspoints for contact potential Model 1484 Low Thermal Cable Unterminated Low Thermal short clean high purity copper 1 of 10 Rows Columns 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 KEITHLEY 182 SENSITIVE DIGITAL VOLTMETER TRG SRQ REM TALK LSTN Model 182 5 3 6 Contact potential tests These tests check t...

Page 69: ...correct enabled for the entire procedure 6 On the Model 617 select the 20pA range and re lease zero check 7 On the Model 617 press suppress to cancel offset current and then enable zero check 8 On the Model 617 set the voltage source for 100V and select the 200nA current range Make sure the voltage source is in standby 9 Place the Model 617 in the V I measurement func tion by pressing SHIFT OHMS 1...

Page 70: ...ow 3 Col 7 to Row 4 Col 8 Row 3 and Row 4 1 3 7 and 1 4 8 8 Row 3 Col 8 to Row 4 Col 9 Row 3 and Row 4 1 3 8 and 1 4 9 9 Row 3 Col 9 to Row 4 Col 10 Row 3 and Row 4 1 3 9 and 1 4 10 Figure 5 5 Path isolation testing guarded 1 2 3 4 1 3 4 5 6 7 8 9 10 2 Model 7012 HI Model 617 INPUT Model 7025 Unterminated Triax Cable Red Banana to Banana Cable Ground Link Removed Unterminated Banana Cables Source ...

Page 71: ...On the Model 617 set the voltage source for 100V and select the 200nA current range Make sure the voltage source is still in standby 6 Place the Model 617 in the V I measurement func tion by pressing SHIFT OHMS 7 Turn on the Model 7001 but do not program any channels to close All channel crosspoints must be open 8 On the Model 617 disable zero check and press OPERATE to source 100V 9 After allowin...

Page 72: ... L H L H L H L H L H L H L H L H L Figure 5 7 Common mode isolation testing 1 2 3 4 1 3 4 5 6 7 8 9 10 2 Model 7012 HI Model 617 INPUT Model 7025 Unterminated Triax Cable Red Banana to Banana Cable Ground Link Removed Unterminated Banana Cable Source V and Measure V I HI Chassis Ground is accessible at 7001 rear panel Columns 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 Rows Jumpers 1 o...

Page 73: ... are static sensitive it is recommended that they all be treated as static sensitive 1 Such devices should be transported and handled only in containers specially designed to prevent or dissipate static build up Typically these devices will be received in anti static containers made of plastic or foam Keep these parts in their original containers until ready for installation 2 Remove the devices f...

Page 74: ...iagram of the Model 7012 Key elements include the relay drivers and relays as well as the ROM which contains card ID and conÞguration information These various elements are discussed in the following paragraphs Figure 5 8 Model 7012 block diagram To Mainframe CLK Data Strobe Enable Relay Drivers U100 U104 Relays User connections ID CLK ID DATA ROM U105 3 5V Steady State 5 7 100 msec during relay a...

Page 75: ... more data The ROM will then sequentially transmit data after each acknowledge signal it receives 4 Once all data is received the mainframe sends a stop command which is a low to high transition of the IDDATA line with the IDCLK line held high see Figure 5 9 5 5 3 Relay control Card relays are controlled by serial data transmitted via the relay DATA line A total of Þve bytes for each card are shif...

Page 76: ... IDDATA Data output from mainframe or ROM IDDATA A power on safeguard circuit made up of U114 a D type ßip ßop and associated components ensures that relays do not randomly energize on power up and power down This circuit disables all relays all relays are open during power up and power down periods The PRESET line on the D type ßip ßop is controlled by the 68302 microprocessor while the CLK line ...

Page 77: ...7001 mainframe Some of the procedures may expose you to hazardous voltages Observe stan dard safety precautions for dealing with live circuits Failure to do so could result in personal injury or death CAUTION Observe the following precautions when troubleshooting or repairing the switch card To avoid contamination which could degrade card performance always handle the card only by the handle and s...

Page 78: ... 7 U105 pin 6 ID DATA pulses During power up only 8 U100 pin 7 STROBE pulse End of relay update sequence 9 U100 pin 2 CLK pulses During relay update sequence only 10 U100 pin 3 DATA pulses During relay update sequence only 11 U100 U104 pins 10 18 Low with relay energized high with relay de energized Relay driver outputs 3 5VDC present at V pad under steady state conditions This voltage rises to 5 ...

Page 79: ...resenta tive or the factory see inside front cover for addresses When ordering parts be sure to include the following information 1 Card model number 7012 S or 7012 C 2 Card serial number 3 Part description 4 Circuit description if applicable 5 Keithley part number 6 4 Factory service If the card is to be returned to Keithley Instruments for repair perform the following 1 Complete the service form...

Page 80: ...del 7011 and 7012 use the same relay card only the connector cards are different Table 2 Parts List Screw Terminated Connector Card for 7012 S 7012 160 Component Layout Screw Terminated Con nector Card for 7012 S 7012 166 Schematic Screw Terminated Connector Card for 7012 S Table 3 Parts List Mass Terminated Connector Card for 7012 C 7012 170 Component Layout Mass Terminated Con nector Card for 70...

Page 81: ... CERAMIC C 365 1 C 365 1 C 237 1 C 22 001 C 314 10 C 64 150P J1002 1003 CONNECTOR MALE CS 736 2 K100 139 RELAY ULTRA SMALL POLARIZED TF2E 5V RL 149 P2001 CONNECTOR RIGHT ANGLE MALE CS 775 1 Q100 Q101 TRANS NPN PWR TIP31 TO 220AB TRANS N CHAN MOSPOW FET V11713 TO 92 TG 253 TG 195 R100 R101 R102 103 R104 R105 R106 RES 2 49K 1 1 8W METAL FILM RES 1 15K 1 1 8W METAL FILM RES 560 10 1 2W COMPOSITION RE...

Page 82: ...OARD ASS Y ORIENT ARROW TOWARDS PIN 1 OF DEVICE E2 25917 CHG D U105 FROM IC 737 TO TC17 100 DELETED SO 72 KK 6 18 01 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

Page 83: ...2 25917 ...

Page 84: ...TC17 100 25917 2 ...

Page 85: ...P1002 1003 SHIELD STRIP POLYURETHANE FOR BOTTOM CLAMP TOP CLAMP 2 56X7 16 PHILLIPS PAN HEAD FOR TERMINAL SHIELD BOARD 7011 304 2 FA 243 1 7011 309 7011 305 2001 345 1 7011 302 2 56X7 16PPH J1004 1006 J1005 1007 CONN 6 PIN CONN 8 PIN TE 115 6 TE 115 8 P1002 1003 CONNECTOR FEMALE CS 748 3 Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com ...

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Page 88: ... 365 1 CR101 104 DIODE SILICON IN4148 DO 35 RF 28 E101 102 BEAD FERRITE CT 9 J1004 CONN 96 PIN 3 ROWS CS 514 K101 104 RELAY ULTRA SMALL POLARIZED TF2E 4 5V RL 162 P1002 1003 CONNECTOR FEMALE CS 748 3 Q101 TRANS NPN SILICON BUK456 1000B TG 47 R101 102 R103 RES 220 10 1 2W COMPOSITION RES 100K 5 1 4W COMPOSITION OR FILM R 1 220 R 76 100K Artisan Scientific Quality Instrumentation Guaranteed 888 88 S...

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Page 91: ...alibration only CertiÞcate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement system including all instruments connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboratory out of doors etc What power line voltage is used Ambient temperature F Relat...

Page 92: ...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 ...

Page 93: ...quipment 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 documentation Artisan Scientific Corporation dba Artisan Technology Group is not an affiliate representative or authorized distributor for any manufacturer listed herein We re here to make your life easier How...

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Summary of Contents for 7012-C

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Keithley 7012-C, Instruction Manual, Page: 55 / 93

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Summary of Contents for 7012-C

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