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Keithley 7070, Instruction Manual

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Keithley 7070 Instruction Manual Download Page 12

 

2.6.2

Radio Frequency Interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-21

2.6.3

Ground Loops. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-21

2.6.4

Keeping Connectors Clean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-22

2.6.5

Shielding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-22

2.6.6

Guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-23

 

SECTION 3 — 

 

Applications

 

3.1

INTRODUCTION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.2

SCANNER SWITCHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.2.1

Scanner Con

Þ

guration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.2.2

Relay Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.2.3

Programming the Scanner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

3.2.4

A Practical Scanner Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

3.3

ON-CARD BUFFERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-6

3.3.1

Buffer Con

Þ

guration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-6

3.3.2

Buffer Considerations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-7

3.3.3

Powering the Buffer ICs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-7

3.3.4

A Typical Buffer Application  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-8

3.4

SOLID-STATE RELAYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-11

3.4.1

Solid-state Relay Advantages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-11

3.4.2

Typical Application  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-13

3.4.3

Solid-state Relay Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-14

3.4.4

Programming Solid-state Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-14

3.5

HIGH-SPEED ANALOG SWITCHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-14

3.5.1

Analog Multiplexer ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-14

3.5.2

Typical Analog Switching Circuit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.5.3

Control Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-17

3.6

USING THE ADAPTER CARD WITH OTHER MATRIX CARDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-18

3.6.1

Scanner-Matrix Combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-18

3.6.2

Signal Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-18

 

SECTION 4 — 

 

Service Information

 

4.1

INTRODUCTION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

4.2

HANDLING AND CLEANING PRECAUTIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

4.3

SPECIAL HANDLING OF STATIC-SENSITIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

4.3.1

Rear Shield  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

4.4

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2

4.4.1

Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2

4.4.2

Troubleshooting Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2

4.5

PRINCIPLES OF OPERATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3

4.5.1

Block Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3

4.5.2

ID Data Circuits  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-4

4.5.3

Relay Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-5

4.5.4

Power-on Safeguard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-5

 

SECTION 5 — 

 

Replaceable Parts

 

5.1

INTRODUCTION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

5.2

PARTS LISTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

5.3

ORDERING INFORMATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

5.4

FACTORY SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

5.5

COMPONENT LAYOUT AND SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

Summary of Contents for 7070

Page 1: ...c i a n sw i t ho v e r 1 5 0y e a r so f s p e c i a l i z a t i o n 9 0d a yw a r r a n t y 5d a yr i g h t o f r e t u r no na l l e q u i p me n t 1 3y e a r w a r r a n t i e sf o r n e wa n d p...

Page 2: ...Model 7070Universal Adapter Card Instruction Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E...

Page 3: ...R ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS B...

Page 4: ...Model 7070 Universal Adapter Card Instruction Manual 1988 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Second Printing October 2000 Document Number 7070 901 01 Rev B...

Page 5: ...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 Revi sion includes a revised copy of this print...

Page 6: ...I O connections are for connection to Category I sources un less otherwise marked or described in the Manual Exercise extreme caution when a shock hazard is present Lethal voltage may be present on ca...

Page 7: ...lly 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 accessories...

Page 8: ...before measuring Do not exceed ZOOVbetween any two pins or any pin and earth ground Inspect the connecting cables and test leads for possible wear cracks or breaks before each use For maximum safety d...

Page 9: ...ee individual card specifications for their relay drive requirements RELAY DRIVE LINES 96 open collector sink drivers 140mA each Coded in 8 row x 12 column format for front panel display User may prov...

Page 10: ...nts information for mounting relays and other components on the breadboard portion of the Model 7070 SECTION 2 Operation Gives typical applications for the Model 7070 SECTION 3 Applications Contains p...

Page 11: ...nd 6V Supplies 2 6 2 3 10 Chassis and GND Connections 2 6 2 4 EXTENDER CARD OPERATION 2 6 2 4 1 Selecting the Extend Function 2 6 2 4 2 Ribbon Cable Connections 2 6 2 4 3 Connecting Cards to the Exten...

Page 12: ...ing Solid state Relays 3 14 3 5 HIGH SPEED ANALOG SWITCHING 3 14 3 5 1 Analog Multiplexer ICs 3 14 3 5 2 Typical Analog Switching Circuit 3 15 3 5 3 Control Program 3 17 3 6 USING THE ADAPTER CARD WIT...

Page 13: ...Connections 2 24 SECTION 3 Applications Figure 3 1 A Scanner as a Rotary Switch 3 2 Figure 3 2 8 Input 2 Pole Relay Scanner 3 3 Figure 3 3 Scanner Relay Coil Wiring 3 3 Figure 3 4 Program 1 Flowchart...

Page 14: ...1 Table 2 3 Partial List of Recommended Spacing for High Voltage Circuits 2 16 Table 2 4 Column Numbering by Slot and Unit 2 17 SECTION 3 Applications Table 3 1 Multiplexer IC Truth Table 3 15 SECTION...

Page 15: ...capability On card decoding circuity to allow mainframe front panel and IEEE 488 control of user installed relays and circuits Plated through holes and pads for easy access to back plane pathways and...

Page 16: ...bbon cable clips 5 Model 7070 Instruction Manual Additional Accessories as ordered 1 7 3 Instruction Manual The Model 7070 Instruction Manual is three hole drilled so that it can be added to the three...

Page 17: ...DLING PRECAUTIONS To maintain isolation care should be taken when handl ing the adapter card to avoid contamination from such foreign materials as body oils Such contamination can substantially lower...

Page 18: ...m m m m m m m m m m m m m m m m m m m m m m m m m m m m 01 m m m m m...

Page 19: ...cards available for the matrix system the Model 7071 General Purpose Matrix Card the Model 7072 Semiconductor Matrix Card and the Model 7073Coaxial Matrix Card As summarized in Table 1 ANALOG l ac ces...

Page 20: ...d as an extender card for troubleshooting or bench top testing of other matrix cards The following paragraphs discuss set ting up the unit as an extender card connecting the ribbon cables and connecti...

Page 21: ...t has been set outslde the mainframe on a non conductive surface Do not place the matrix card on a conductive surface such as a rack Voltages present on the card could short caus ing a shock hazard or...

Page 22: ...spring loaded screws WARNING The mounting screws must be secured to en sure a proper chassis ground connectlon be tween the card and the mainframe Failure to properly secure this ground connection ma...

Page 23: ...OPERATION CARD HANDLE MOUNTING SCREWS Figure 2 5 Model 7070 Installation 2 9...

Page 24: ...totyping areas on the card allow the installation of user supplied relays or active circuits for custom matrix applications The following paragraphs describe the major aspects of using the Model 7070a...

Page 25: ...the flux around to other areas of the board 2 After cleaning with FreorP swab the treated area with clean methanol then blow dry the board with dry nitrogen gas 3 After cleaning the board allow it to...

Page 26: ...ccur Splitting the Relay Supply In some cases you may wish to split up the power supply allotment among the relays because of different relay voltages or other factors such ascurrent constraints Todo...

Page 27: ...ls simply connect one side of each coil to the V RELAY BUS and connect the other side of the coil to the relay driver connection pad An example of such connections for all 12columns of row A is shown...

Page 28: ...IC Figure 2 9 Typical Relay Driver Output P v Relay Bus 6V or 35V Maximum External Supply User Installed Relays Relay Drivel Outputs ii l El i Al A2 A3 A4 A5 A6 A7 A6 A9 A10 Al 1 A12 Notes 1 Maximum...

Page 29: ...onnec relays will be wired in a row column matrix configuration tors while the other end of each row and column group as shown in Figure 2 11 for the sake of clarity we have would be connected to the...

Page 30: ...tandard must be observed A partial list of minimum distances for various recommended voltages is shown in Table2 3 The clearancevalues are distances in free air whiie the creepagevalues are distances...

Page 31: ...able 2 4 For exam ple card column number 2 on a card in slot 5 of unit 1 is accessed as matrix column 62 Each intersecting point in the matrix is called a crosspoint that can be individually closed or...

Page 32: ...OPERATION HII 0GIJARD Typical 3 P Switching HI LO GUARD Columns i Note Switching topology depends on user installed relays and wiring Typical l Pole Switching Figure 2 12 Matrix Organization 2 18...

Page 33: ...With the row jumpers removed cards in slots 1through 3 areconnected and cards in slots 4 through 6 are connected together Because of more critical signal paths rows A B G and H of ANALOG l are not ju...

Page 34: ...OPERATION Figure 2 14 16 x 36 Matrix Constructed by External Jumping 2 20...

Page 35: ...equencies across the spectrum Such RF1can be par ticularly troublesome at low signal levels but is can also affect measurements at high levels if the problem is of suf ficient severity RF1can be cause...

Page 36: ...ing high impedance measurement paths If the connector insulators should become contaminated either by inadvertent touching or from air borne deposits they can be cleaned with a cotton swab dipped in c...

Page 37: ...age current flows through the leakage resistance RL Leakage between inner and outer shields may be con siderable but that leakage is of little consequence because that current is supplied by the buffe...

Page 38: ...s Measuring or Sourcing Crosspoint Relay Instrument Connect Guard L J to Relay Shield if available Matrix Card Warning Lethal voltage may be present on guard Surround guard with safety shield Connect...

Page 39: ...sshown in Figure 3 l Each switch position is ac tually a set of relay contacts giving the switch 1 2 3 or even 4 pole switching capability A scanner operates by stepping through its inputs or chan nel...

Page 40: ...r i I I DUT 1 I I DUT 2 I 0 I I I DUT 3 I 0 I I I I I DUT 4 I 0 I I Measuring Instrument DUT 5 I o I I I I I DUT 6 0 I I I DUT 7 I 0 I DUT 8 I 0 I I I L l Multiplexer Figure 3 1 A Scanner as a Rotary...

Page 41: ...basic principles of controlling the scan ner with programming Figure 3 4is aflowchart of the pro gram One feature included in the program is a program mable channel settling time As written the progra...

Page 42: ...can be modified to make the resistance measurements Program 2 below provides the basic test capability for the system including the basic scanner se quencing and obtaining and displaying areading fro...

Page 43: ...APPLICATIONS r i OHMSSENSE HI cLT OHMS LO OHMS SENSE LO on 7070 Card Figure 3 5 Testing Thick Film Resistor with a Scanner 3 5...

Page 44: ...lumn inputs and any switching relays asshown in the simple matrix of Figure 3 7 In this instance a simple 2 x 2 matrix is shown but the same general configuration would be used for larger matrices Sin...

Page 45: ...to the circuit board itself instead mount Teflon insulators on the board and make all con nections at the insulator terminals 3 3 3 Powering the Buffer ICs Typical ICs used as buffers require both pos...

Page 46: ...tests Basically resistivity is determined by forcing a current through the sample under test and then measuring the voltage acrossthe sample In this example the current is sourced by a Model 220curren...

Page 47: ...APPLICATIONS 1 2 Columns A 220 Current source Sources Current through Sample 196 DMM Measures Voltage Across sample Figure 3 9 Typical High Resistivity Test System 3 9...

Page 48: ...APPLICATIONS A4 03 Cl Al I 02 c l G H Note Denotes closed crosspoints from figure 3 9 Figure 3 10 Voltages Necessary to Determine Resistivity 3 10...

Page 49: ...ero crossing turn on Zero crossing action simply means that the switching action of the relay occurs at the point when the ac signal crosses the zero axis as indicated in Figure 3 11 Zero crossing swi...

Page 50: ...ntrol I Input Input L L R V 1 I DC Supply Load I __ J DC Solid State Relay D r Figure 3 12 Typical DC Solid state Relay v way BUS 1 r I Control I Input L Relay Driver 1 I AC Supply I J AC Solid State...

Page 51: ...ledyne 675 6 relay Keithley part number RL78 The control voltage for this The relay output is connected in series with the acsupply device is in the range of 3VDC to 32VDC and the unit can and the loa...

Page 52: ...ce such as an MOV should be connected across the out put terminals 3 4 4 Programming Solid state Relays To control solid state relays simple close or open the ap propriate crosspoint as you would with...

Page 53: ...rovide the interface bet ween the timer programming information and the timer itself The logic levels on Al A8 control whether or not a specific timer output is connected to the COUNT output of the ti...

Page 54: ...s used to program the timer with Al the LSB and A8 the MSB of the program 3 16 ming byte The actual interval will depend on the funda mental time unit determined by R and CT as des cribed above 3 The...

Page 55: ...Figure 3 17 is a flowchart of the program Program 3 Multiplexer Control Program Program Comments 16 REBOTE 718 Put 707 in remote 20 IlII1 CtlD1C5UI Dimension command string Define open command letter...

Page 56: ...mit To switch higher voltages signal conditioning cir cuits in the form of voltage dividers can be mounted on the adapter card Figure 3 19shows voltage dividers with 1O l ratios which would for exampl...

Page 57: ...APPLICATIONS r 1 2 3 4 5 6 7 8 9 10 1 12 I 1 I I I I I I I I I L J 7071 General Purpose Matrix car 3 Figure 3 19 Signal Conditioning Example 3 1913 20...

Page 58: ...bject to possible static discharge damage because of the high impedance levels involved When handling such devices use the precautions listed below NOTE In order to prevent damage assume that all part...

Page 59: ...so refer to paragraph 4 5 for an overview of operating principles NOTE The Model 7070 should be in the LOCAL mode when troubleshooting Rear Shield Mounting Hole and Standoff 1 of 8 Matrix Card Chassis...

Page 60: ...Section 5 4 5 1 Block Diagram Figure 4 3 shows a simpli ed block diagram of the Model 7070 Key elements include the buffer U44 ID data circuits U45 U46 and U47 relay drivers U35 U41 and power on safeg...

Page 61: ...is pulsed high to clear the address counter and set it to zero At this point a ROM address of zero is selected This pulse occurs only once 3 The NEXTADDR line is set low NEXTADDRS going low increments...

Page 62: ...t the corresponding relay driver output must be low to energize the associated relay while the output is high when the relay is de energized 4 5 4 Power on Safeguard A power on safeguard circuit made...

Page 63: ...lowing information 1 Card model number 7070 2 Card serial number 3 Part description 4 Circuit designation if applicable 5 Keithley part number 5 4 FACTORY SERVICE If the matrix card is to be returned...

Page 64: ...4W COMPOSITION OR FILM RES 200 5 1 4W COMPOSITION OR FILM RES 1OK 5 1 4W COMPOSITION OR FlLM RES 120K 5 l 4W COMPGSITION OR FILM RES 1 lK 5 1 4W COMPOSITION OR FILM RES 910 5 1 4W COMPOSITION OR FILM...

Page 65: ......

Page 66: ......

Page 67: ......

Page 68: ...ION KEITHLEY PART No C1 CAP 150pF 10 1000V CERAMIC C 64 150P J101 J107 J113 CONN 86 PIN CARD EDGE CONN 34 PIN CARD EDGE CONN 30 PIN CARD EDGE CS 579 1 CS 591 2 CS 591 1 P50 P51 P52 CABLE ASSY 50 PIN C...

Page 69: ......

Page 70: ......

Page 71: ...CABLE 1 CLAhtP LOWER 1 CLAMP UPPER 1 SHIELD I SHlELD REAR 8 STANDOFFS FOR REAR SHIELD 2 SOCKET 16 PIN DIP 12 SOCKET 18 PIN DIP 1 SOCKET 20 PIN DIP 1 SOCKET 28 PIN DIP 1 REAR PANEL 1 SOCKET 14 PIN DIP...

Page 72: ...orautput circle one ODrifts q Unable to zero q Unstable q Will not read applied input q Overload q Calibration only aData required DC of C required attach any additional sheets as necessary Show a blo...

Page 73: ...Landsberger Strasse 65 D 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 1EA 0118 9 57 56 66 Fax 0118 9 5...

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