Keithley 706 User manual

Model 706 Scanner
Instruction Manual
Contains Operating and Servicing Information
Publication Date: April 1991
Document Number: 706-901-01 Rev. E

WARRANTY
Keithley Instruments,Inc. warrantsthis productto befreefrom defectsin materialandworkmanshipfor aperiodof 1yearfrom dateof
shipment.
Keithley Instruments,Inc. warrantsthe following itemsfor 90 daysfrom the dateof shipment:probes,cables,rechargeablebatteries,
diskettes,anddocumentation.
During thewarrantyperiod, we will, atour option, eitherrepair or replaceanyproductthatprovesto bedefective.
Toexercisethis warranty,write or call your local Keithley representative,or contactKeithley headquartersin Cleveland,Ohio.You will
begiven prompt assistanceand return instructions. Sendthe product, transportationprepaid, to the indicated servicefacility. Repairs
will bemadeandtheproduct returned,transportationprepaid.Repairedor replacedproductsarewarrantedfor thebalanceof theorigi-
nal warrantyperiod, or atleast90 (lays.
LIMITATION OF WARRANTY
This warranty doesnot apply to defectsresulting from product modification without Keithley’s expresswritten consent,or misuseof
anyproduct or part.This warranty alsodoesnot apply to fuses,software,non-rechargeablebatteries,damagefrom battery leakage,or
problemsarising from normal wearor failure to follow instructions.
‘ITHISWARRANTY IS IN LIEU OF ALL OTHER WARRANTlES, EXPRESSEDOR IMPLIED, INCLUDING ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESSFORA PARTICULAR USE.THE REMEDIES PROVIDED HEREIN ARE
BUYER’S SOLEAND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY INSTRUMENTS, INC. NORANY OF ITS EMPLOYEES SHALL BE LIABLE FORANY DIRECT, INDI-
RECT,SPECIAL, INCIDENTAL QRCONSEQUENTIAL DAMAGES ARISING OUT OFTHE USEOFITS INSTRUMENTS AND
SOFTWAREEVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF
SUCHDAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTSOF REMOVAL
AND INSTALLATION, LOSSESSUSTAINEDAS THE RESULTOF INJURY TOANY PERSON,ORDAMAGE TO PROPERTY.
Keithley Instruments, Inc. l 28775AuroraRoad l Cleveland,OH44139 l 216-248-0400 l Fax:[phone] l http://www.keithley.com
CHINA: Keitbley Instruments Cl&m. Yuan Chen Xio Building, Room 705
l No. 12Yomin Road, Dewei, Madian. Beijing, China loo029 l 8610-2022886 l Fax: [phone]
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Model 706 Scanner
Instruction Manual
01983, Keithley Instruments, inc.
Test Instrumentation Group
All rights reserved.
Cleveland, Ohio, U.S.A.
Fifth Printing, April 1991
Document Number: 706-901-01 Rev. E

SPECIFICATIONS
GENERAL
DISPLAY: Seven 0.5” LED digits with decimal point, function and
IEEE status annunciators.
INTERNAL CLOCK: Displays hours/minutes/seconds or date/
month; less than 1 minute/month error (typical).
BATTERY BACKUP: Rechargeable 3.6V nickel-cadmium. I month
retention of data with unit turned off.
OPERATING ENVIRONMENT: O” to 50°C, 0% to 80% relative
humidity up to 35OC.
STORAGE ENVIRONMENT: -25OC to 65OC.
CONNECTORS; Four BNC (lTL compatible): External Trigger,
Alarm Out/Serial-In, Channel Ready, Serial Out.
CAPACITY: Ten plug-in cards per mainframe.
EXPANSION CAPACITY: Daisy chain allows up to 4 SLAVE units
with I MASTER unit.
SWITCHING RATE: 100 channels/second (IOmsl, programmable
to 1 channel/l6 minutes (999.999s).
RELAY DRIVE: 4A minimum.
POWER: 90-125V or 195250V (internally selected), 50Hz to 400H2,
75V.A maximum.
DIMENSIONS, WEIGHT: 178mm high x 438mm wide x 448mm
deep (7” x 17 l/4” x 17 3/8”). Net weight 8.6kg (19 Ibs).
ACCESSORIES AVAILABLE:
Model 7008-3: IEEE-488 Cable, 0.9m (3 ft.)
Model 70086: IEEE-488 Cable, 1.8m (6 ft.)
Model 7010: IEEE-488 Adapter for Model 85 Computer.
Model 7024-I: Triaxial Cable, 0.3m (I ft.)
Model 7024-3: Triaxial Cable, 0.9m (3 ft.)
Model 7024IO:Triaxial Cable, 3.0m (IO ft.1
Model 7051-2: BNC to BNC Cable, 0.6m (2 ft.)
Model 7051-5: BNC to BNC Cable, 1.5m (5 ft.)
Model 7052: 4 x 5 Matrix Card
Model 7053: High Current Scanner Card
Model 7054: High Voltage Scanner Card
Model 7056: General Purpose Scanner Card
Model 7057A: Thermocouple Scanner Card
Model 7058: Low Current Scanner Card
Model 7059: Low Voltage Scanner Card
Model 7061: Universal Interface Card
Model 7068: Fixed Rack Mounting Kit for 706
Model 7069: Slide Rack Mounting Kit for 706
IEEE-488 BUS IMPLEMENTATION:
Multiline Commands: DCL, LLO, SDC, GET, GTL, UNT, UNL,
SPE, SPD.
Uniline Commands: IFC, REN, EOI, SRQ, ATN.
Interface Functions: SHI, AHI, T6, TM, L4, LEO,SRI, RLI, PPO,
DCI, DTI, CO, El.
Programmable Parameters: Display Mode, Output Format, EOI,
SRQ, Fir&Last, Open, Close, Display Channel, Alternate Output,
Pole Mode, Date Format, Save/Recall, Reset, I/O Port, Time,
Date, Settle Time, Interval Time, Alarm Time, Program Mode,
Trigger Mode, Terminator, Self Test.
Digital I/O Port: A separate edge connector consisting of eight
input and eight output lines as well as common and + R/DC. Out-
puts will drive one lTL load. Inputs represent one lTL load.
Mating connector supplied.
FRONT PANEL PROGRAMS
0 - Digital I/O
I* - Date Format
2* - Settle Time
3* - IEEE Address
4* - Save Setup
5* - Recall Setup
6* - Poles
7 - Alarm Time
8 - Self Test
go* - Stand Alone
91, - Master
92* - Slave
93 - Inspect
94 - Clear
99 - Reset
*Battery backed up.
Read or change state on digital I/O port.
Changes date display between MM.DD
and DD.MM.
Time to output CHANNEL READY pulse
after closing relay.
Set bus address; not programmable from
bus.
Stores present relay setup in buffers l-75.
Recalls relay setup in buffers l-75.
1, 2, or Qpole configuration for scanning
(I-pole requires 7056). O-pole for matrix
card.
Set time for Alarm output pulse; repeats
daily.
Check RAM, ROM, LEDs.
Single 706 configuration.
Daisy Chain configuration.
Daisy Chain configuration.
Display closed relays only.
Clear buffer location.
Reset battery backup parameters to fac-
tory values.
Speclfi+lons subject to change without notice.

Safety Precautions
The following safetyprecautionsshouldbeobservedbeforeusing
this productandanyassociatedinstrumentation.Although somein-
strumentsand accessorieswould normally be usedwith non-haz-
ardousvoltages, there are situations wherehazardousconditions
maybepresent.
This productis intendedfor useby qualified personnelwho recog-
nize shockhazardsandarefamiliar with thesafetyprecautionsre-
quired to avoid possible injury. Readthe operating information
carefully beforeusing the product.
Exercise extremecaution when a shockhazardis present.Lethal
voltage may be presenton cableconnectorjacks or test fixtures.
The American National StandardsInstitute (ANSI) statesthat a
shock hazardexists when voltage levels greaterthan 30V RMS,
42.4Vpeak,or 60VDC arepresent. A good safety practice is to ex-
pect that hazardous voltage is present in any unknown circuit
before measuring.
Beforeoperatinganinstrument,makesuretheline cordis connect-
edto aproperly groundedpowerreceptacle.Inspecttheconnecting
cables,testleads,andjumpersfor possiblewear,cracks,or breaks
beforeeachuse.
For maximum safety,do not touchtheproduct,testcables,or any
other instrumentswhile power is appliedto the circuit undertest.
ALWAYS removepower from theentiretestsystemanddischarge
any capacitorsbefore:connectingordisconnectingcablesorjump-
ers, installing or removing switching cards,or making internal
changes,suchasinstalling or removingjumpers.
Do not touch any object that could provide a current path to the
commonsideof the circuit undertestor powerline (earth)ground.
Always makemeasurementswith dry handswhile standingon a
dry, insulated surface capableof withstanding the voltage being
measured.
Do not exceedthe maximum signal levels of the instrumentsand
accessories,asdefinedin thespecificationsandoperatinginforma-
tion, and as shown on the instrument or test fixture panels, or
switching card.
Do notconnectswitching cardsdirectly tounlimited powercircuits.
They are intended to be used with impedance limited sources.
NEVER connectswitching cardsdirectly to AC main. Whencon-
necting sourcesto switching cards,install protectivedevicestolim-
it fault currentandvoltageto thecard.
Whenfusesareusedin aproduct,replacewith sametypeandrating
for continuedprotectionagainstfire hazard.
Chassisconnectionsmustonly be usedasshield connections for
measuringcircuits, NOT assafetyearthgroundconnections.
If you areusingatestfixture, keepthelid closedwhile poweris ap-
plied to thedeviceundertest.Safeoperationrequiresthe useof a
lid interlock.
Ifa @ screwis present,connectit to safetyearth ground using
#18AWG or largerwire.
The t symbolonaninstrumentoraccessoryindicatesthat 1OOOV
or moremaybepresentontheterminals. Refertotheproductman-
ual for detailedoperatinginformation.
Instrumentation and accessoriesshould not be connected to hu-
mans.
Maintenance should be performedby qualified service personnel.
Before performing any maintenance;disconnectthe line cord and
all testcables.

TABLE OF CONTENTS
Paragraph Title Page
1.1
1.2
1.3
1.4
E
1:7
1.8
1.9
;-:
2:2.1
2.2.2
2.3
z.2
2:5.1
2.5.2
2.5.3
2.5.4
2.6
E
2:9
2.9.1
2.9.2
2.9.3
2.9.4
2.9.5
2.9.6
2.9.7
2.9.8
2.9.9
2.9.10
2.9.11
2.9.12
2.9.13
2.9.14
SECTION l-GENERAL INFORMATION
Introduction ................................................................................... l-l
Model 706 Features ............................................................................. l-l
Warranty information. ........................................................................... l-l
Manual Addenda ............................................................................... l-l
Safety Symbols and Terms ....................................................................... l-l
Unpacking and Inspection ........................................................................ l-l
Specifications.............................................;.- ................................... l-l
Optional Accessories ............................................................................ l-2
Repackingforshipment ......................................................................... 1-3
SECTION 2-OPERATION
Introduction ................................................................................... 2-1
PreparationforUse .............................................................................. 2-l
CorrectLineVoltage ........................................................................... 2-l
Plug-In Card (Scanner) Installation ............................................................... 2-l
PowerUp ..................................................................................... 2-2
Environmental Condition ......................................................................... 2-3
Operatinglnstructions ........................................................................... 2-3
FrontPanelControls ........................................................................... 2-3
Rear Panel Description. ........................................................................ 2-3
Basic Front Panel Operation .................................................................... 2-7
ScanningExamples ........................................................................... 2-8
Front Panel Clock Operation ..................................................................... 2-13
Detailed Front Panel Controls Description .......................................................... 2-14
DetailedRearPanelDescription .................................................................. 2-17
Front Panel Programs. .......................................................................... 2-18
Program 0 Digital I/O ......................................................................... 2-19
Program 1 Data Format ....................................................................... 2-19
Program 2 Relay Settle Time ................................................................... 2-20
Program 3 Set IEEE Primary Address ........................................................... 2-20
Program 4 Save Relay Set Up .................................................................. 2-21
Program 5 Recall Relay Set Up ................................................................. 2-21
Program 6 Pole Configuration, Matrix Mode ....................................................... 2-22
Program 7 Set Alarm Time .................................................................... 2-24
Program 8 Diagnostic Self Test. ................................................................ 2-25
Program 90 Stand Alone ...................................................................... 2-25
Program 91 Master. .......................................................................... 2-25
Program92Slave ............................................................................ 2-26
Program 93 Inspect ......................................................................... 2-26
Program 94 Clear ............................................................................ 2-27
2.9.15 Program 99 Reset ............................................................................ 2-28
SECTION 3-IEEE BUS OPERATION
3.1 Introduction ................................................................................... 3-l
3.1.1 Software Consideration ........................................................................ 3-l
3.1.2 HP-85BASlCStatements ...................................................................... 3-l
3.1.3 Interface Function Codes. ...................................................................... 3-2
3.1.4 Mode 706 Interface Commands ................................................................. 3-3
3.2 IEEE488 Bus Lines .............................................................................. 3-3
3.2.1 Bus Management Lines ........................................................................
3.2.2 Handshake Lines ............................................................................. ifi
3.2.3 Data Lines ................................................................................... 3-4
3.3 System Set Up Procedure ........................................................................ 3-4
i

;*i 1
31412
3.4.3
3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
3.5.7
3.58
3.6
3.7
3.8
3.9
3.9.1
3.9.2
3.9.3
3.10
4.1
4.2
4.3
f.2
5.1
5.2
5.3
5.4
5.5
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
5.5.6
5.6
5.7
6.1
6.2
6.3
6.4
6.5
Bus Commands ................................................................................
Uniline Commands ............................................................................
Universal Commands ..........................................................................
Addressed Commands ......................................................................... ;1;
Device-Dependent Commands ....................................................................
DisplayMode ............................................................................... 331:
Program(Scan)Mode.. ...................................................................... 3-14
Prefix.. .................................................................................... 3-15
EOI(EndorIdentify) .......................................................................... 3-16
BusResponseMode(SRQ) .................................................................... 3-16
TriggerModes ............................................................................... 318
Programmable Terminator (Y) .................................................................. 3-18
Inputs....................................................-. ................................. 3-19
StatusByteFomat ............................................................................. 3-27
Status Word (U) ............................................................................... 3-28
Front Panel Programs .......................................................................... 3-29
FrontPanelErrorMessages ...................................................................... 3-29
IDDCError .................................................................................. 3-29
No Remote Error. ............................................................................ 3-29
IDDCOError ................................................................................ 3-29
ScanningProgram ............................................................................. 3-29
SECTION 4-THEORY OF OPERATION
Introduction ...................................................................................
PowerSupply ..................................................................................
Microcomputer .................................................................................
DisplayCircuit ..................................................................................
IEEE-488lnterfaceCircuitry .......................................................................
SECTION 5-MAINTENANCE
Introduction ...................................................................................
FuseReplacement ..............................................................................
LineVoltageSelection ...........................................................................
Disassembly ...................................................................................
Troubleshooting ................................................................................
RecommendedTestEquipment .................................................................
DigitalSelfTest ...............................................................................
PowerSupplyChecks .........................................................................
DigitalCircuitryChecks ........................................................................
Display Boards Check ............. T
...........................................................
InterconnectBoardChecks .....................................................................
BatteryCharge .................................................................................
Special Handling of Static Sensistive Devices ........................................................
SECTION 6-REPLACEABLE PARTS
Introduction ...................................................................................
Pa&List ......................................................................................
Orderinglnformation.. ..........................................................................
Factory Service. ................................................................................
Component Location Drawings and Schematic Diagrams ..............................................
4-1
4-l
4-l
4-3
4-3
5-l
5-l
5-1
5-3
5-6
5-6
5-6
5-7
5-7
5-7
z
5-8
6-l
6-l
6-l
6-l
6-1

Figure
LIST OF FIGURES
Title
1-I
;::
;:“4
2-5
;:y
3-2
3-3
$2
3-6
g;:
3-9
4-1
2::
2::
6-l
6-2
6-3
6-4
6-5
6-6
6-7
6-8
Model706Scanner ..................................................................
Scanner Card Installation .............................................................
FrontPanelControl ..................................................................
Model706RearPanel ...............................................................
Daisy Chain Configuration ............................................................
Model7052MatrixScheme ...........................................................
Matrix Display Clarification ............................................................
BusStructure ......................................................................
HandshakeSequence ................................................................
ContactAssi nments ................................................................
TypicalBus 8onnector ...............................................................
Digital I/O Port Pin Assignment .........................................................
UandGModeSequence .............................................................
StatusByte Format ..................................................................
Status Word Format .................................................................
IEEE Display Error Messages ..........................................................
Model706BlockDiagram .............................................................
Model706MemoryMap ..............................................................
Topand BottomCoverRemoval ........................................................
PowerSup IyExplodedView ..........................................................
Model706 L1- opView ......... .:. .:. .. I .. .‘. .. lI. .~.._‘...._. ..............................
1-o
;:$I
22;7
2-23
2-24
;:;
3-5
3-5
3-24
3-27
3-28
3-28
3-29
z
5-2
5-4
5-5
6-9
Display Board, Component Location Drawing, Dwg. No. 706-l 10 ..............................
Digital I/O Board, Component Location Drawmg, Dwg. No. 706-170 ............................ 6-10
Mother Board, Component Location Drawing, Dwg. No. 706-I 10 ........................... 6-I 1/6-l 2
Interconnect Board, Component Location Drawing, Dwg. No. 706-I 60 ....................... 6-l 5/6-i 6
Display Board, Schematic Diagram, Dwg. No. 705-l 16 ................................... 6-17/6-18
Digital I/O Board, Schematic Diagram, Dwg. No. 706-176 ................................. 6-19/6-20
Mother Board, Schematic Diagram, Dwg. No. 706-I 06 ................................... 6-21/6-22
Interconnect Board, Schematic Diagram, Dwg. No. 706-l 66 ............................... 6-25/6-26
Page
LIST OF TABLES
Table Title Page
2-1 LineVoltageSetting .................................................................
2-2 Slot Number/Channel Number Assignment ...............................................
2-3 Power Up Default Conditions (Front Panel Operation) .......................................
2-4 Front Panel Controls .................................................................
2-5 Rear Panel Description ...............................................................
2-6 StepScanExample ..................................................................
2-7 SingleScanExample ................................................................
2-8 ContinuousScanExample ............................................................
2-9 Required Equipment for Daisy Chain Example .............................................
2-10 Daisy Chain Example ................................................................
2-11 Temperature Scan Example ...........................................................
2-12 Low Current Scan Example ...........................................................
2-13 SettingtheTime ....................................................................
2-14 SettingtheDate ....................................................................
2-l 5 Maximum Relay Drive Current from Mainframe ............................................
2-l 6 CANCEL Function Example ...........................................................
2-17 Summary of Front Panel Programs ......................................................
2-l 8 Scanner Card Pole Configuration .................. .,
....................................
2-19 Matrix Unit Number Display Assignment ..................................................
2-1
2-l
g:;
2-7
;:g
2-10
2-l 0
2-l 1
12-12
2-13
2-l 3
2-14
2-15
2-16
2-19
2-22
2-24
Iii

LIST OF TABLES (CONT.)
2-20 Matrix Card Number Display Assignment ............................................................ 2-24
2-21 Program 99 Reset Condition ....................................................................... 2-29
3-l HP-85 IEEE-488 BASIC Statements .................................................................. 3-2
3-2 Model 706 Interface Function Codes ................................................................. 3-3
3-3 IEEECommand Groups ............................................................................ 3-3
34 IEEE Bus Connector Contact Designations ............................................................ 3-5
3-5 Power Up, DCL and SDC Default Conditions .......................................................... 3-6
3-6 Device-Dependent Commands Not Available to the Front Panel .......................................... 3-9
3-7 Model 706 Device-Dependent Commands ........................................................... 3-10
3-8 Hierarchy of Command Execution .................................................................. 3-12
3-9 SRQ Commands and Conditions ................................................................... 3-16
3-10 Digital I/O Port Contact Pin Assignments ............................................................ 3-24
5-l Fuse Replacement 3AG Size. ....................................................................... 5-l
5-2 Fuse Replacement 5mm Size ....................................................................... 5-l
5-3 Line Voltage Selection. ............................................................................ 5-l
54 RecommendedTestEquipment ..................................................................... 5-6
5-5 PowerSupplyChecks ............................................................................. 5-6
5-6 DigitalCircuitn/Checks ............................................................................ 5-7
5-7 DisplayBoardChecks ............................................................................. 5-7
5-8 InterconnectBoardChecks ......................................................................... 5-8
5-9 Model 706 Static Sensitive Devices .................................................................. 5-8
6-l Model 706 Recommended Spare Parts List. ........................................................... 6-l
6-2 Index of Model 706 Schematics and Component Layouts. ............................................... 6-l
6-3 Display Board Parts List ........................................................................... 6-2
6-4 Mother Board Parts List ........................................................................... 6-3
6-5 Digital I/O Board Parts List ......................................................................... 6-5
6-6 Interconnect Board Parts List ....................................................................... 6-6
6-7 Model 706 Mechanical Parts List .................................................................... 6-7
Iv

Figure l-l. Model 706 Scanner
1-O