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]
FRANCE Keitbley Instruments SAkL
l BP 60.3 al& des Garays -91122 Palaiseau C&&x l 31-6-0115155. Fax: [phone]
GERMANY: Keitbley Instruments GnibH
l Laodsberger Stralk 65 l 82110 Germering l 49-89-849307-o l Fax: [phone]
GREAT BRITAIN: Keitbley Instruments, Lt&
l The Minster l 58 Portman Road l Reading, Berkshire RG30 IEA 944-01734-575666 *Fax: [phone]
ITALY: Keitbley Instruments SIk l Viale S. Gimigoano 38 l 20146 Milano l 39-2-48303008. Fax: [phone]
JAPAN: Keitbley Instruments F& East KK
l Aibido Bldg. * 7-20-2 Nishishinjuko . Shiojuku-ko, Tokyo 160 l 81-3-5389-1964 * Fax: [phone]
NETHERLANDS: Keitbley Instruments Bv
l Avelingen West 49 l 4202 MS Gorinchem l 31-(0)183-635333 l Fax: [phone]
SWITZERLAND: Keithley Instruments Sk* Kriesbachstrasse 4
l 8600 Diibendorf* 41-1-8219444 l Fax: 41-l-8203081
TAIWAN Keitbley Instruments Taiwan
l 1, Ming-Yu First SUeet * Hsinchu, Taiwan, R.0.C * 886-35-778462 l Fax: [phone]

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

SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
The Model 706 is an IEEE488 bus compatible scanner that
can accommodate ten plug-in scanner cards. With ten scan-
ner cards installed up to 100 2-pole channels can be on the
same IEEE address. Using four additional Model 706s in a
daisy chain configuration up to 500 2-pole channels can be
on the same IEEEaddress. The Model 706 scanner adheres to
standard IEEE488 interface bus protocol. This enables the
Model 706 to be incorporated into any measurement that
uses programmed control through the IEEE-488 bus.
The front panel controls are clearly marked and easy to use.
These controls serve several functions such as opening a
selected channel, closing the channel, scanning between a
selectable first and last channel, selecting scan rate and
mode. There are 15 internal programs that are accessible
from the front panel. The programs can select primary ad-
dress, settling time, store a relay set up, recall the stored relay
set up, control the digital I/O port, switch from International
to American date format, start or stop a scan sequence,
select 1, 2 or 4-pole measurement modes and program the
Model 706 as a master, slave or stand alone instrument in a
daisy chain configuration. The Model 706 may also be
operated in a matrix configuration.
The time and date are kept internally with a battery backed up
clock allowing time dependent procedures to be performed.
1.2 MODEL 706 FEATURES
The Model 766 scanner includes the following features:
.lJp to 100 2-pole channels.
aIEEE-488 bus operation.
*Selectable scan rate of IOmsec to 999.999sec.
aSelectable scan modes that enable the user to scan the first
channel to the last channel once, continuously or manually.
*Fifteen internal programs that are accessible from the front
panel.
aModel 706 mainframe can accomodate 10 scanner plug-in
cards.
*Several different plug-in scanner cards are available as op-
tions. They include: a general purpose relay card, a ther-
mocouple card, low voltage card, low current card, high
current card, high voltage card, matrix card and universal in-
terface card.
*Time and date are kept with a battery backed up clock.
*Digital I/O port with eight lines as inputs and eight lines as
outputs.
*External trigger input that accepts a greater than wet
negative going TTL compatible pulse for triggering the
Model 706 into a scan sequence.
@Channel ready output that outputs a greater than IOFec
negative going lTL compatible pulse upon the completion
of the programmed channel settling time.
*Alarm output that outputs a negative going lTL level
greater than 10,usec pulse when the programmed time is
reached.
1.3 WARRANTY INFORMATION
Warranty information is provided on the inside front cover of
this manual. If there is a need to exercise the warranty, con-
tact your Keithley representative in your area to determine the
proper action to be taken. Keithley maintains complete repair
and calibration facilities in the United States, West Germany,
Great Britain, France, the Netherlands, Switzerland and
Austria. Information may be directed to the applications
engineer at any of the above locations. Check the inside front
cover of this manual for addresses.
1.4 MANUAL ADDENDA
Improvements or changes to this manual will be explained on
an addendum included with this manual.
1.5 SAFETY SYMBOLS AND TERMS
Safety symbols used in this manual are as follows:
The symbol ’
Q on the instrument denotes that the user
should refer to the operating instructions.
The symbol AM on the instrument denotes that high
voltage may be present on the terminals.
The, WARNING used in this manual explains dangers that
could result in personal injury or death.
The CAUTION used in this manual explains hazards that
could damage the instrument.
1.6 UNPACKING AND INSPECTION
The Model 706 is inspected both electrically and mechanically
before shipment. Upon receiving the Model 706, unpack all
items from the shipping container and check for any obvious
damage that may have occurred during transit. Report any
damage to the shipping agent. Retain and use the original
packaging materials if reshipment is necessary. The following
items are shipped with all Model 706 orders:
*Model 706 Scanner
*Model 706 Instruction Manual
*Optional accessories per request. (Cards are shipped
separately. 1
1.7 SPECIFICATIONS
For Model 706 detailed specifications, refer to the specifica-
tions that precede this section.
1-l

+
1.8 OPTIONAL ACCESSORIES
Switching Cards - Keithley offers over 20 different models of
switching cards. In addition to general purpose scanning and
matrix applications, cards are designed for special applications
with signal handling capabilities that include:
l Low voltage switching to 20nV.
l Low current switching to 1OfA.
l High frequency switching to 500MHz.
o Thermocouple switching with a precision temperature refer-
ence.
l High voltage switching to 1OOOV.
Further details on switching cards can be obtained by contact-
ing a Keithley representative or sales office.
Model 7008-3 IEEE-488 Cable-The Model 7008-3 is a 1 me-
ter (3 feet) IEEE-488 cable. The cable has 24 stranded wire
conductors and is terminated on each end with IEEE-488 stan-
dard connectors.
Model 7008-6 IEEE-488 Cable-The Model 7008-6 is a 2 me-
ter (6 feet) IEEE-488 cable. The cable has 24 stranded wire
conductors and is terminated on each end with IEEE-488 stan-
dard connectors.
Model 7010 Cable Adapter-The Model 7010 is an IEEE-488
cable adapter. The adapter extends the IEEE-488 connector by
one connector width.
Model 7051-2 1 The Model 7051-2 is a (2 feet) BNC to BNC
cable. It is especially useful for daisy chain operation.
Model 7051-5 - The Model 7051-5 is a (5 feet) BNC to BNC
cable. It is especially useful daisy chain configuration.
Model 7068 Fixed Rack Mount-The Model 7068 is a fixed or
stationary rack mounting kit that mounts the Model 706 in a
standard 19 inch rack. The dimensions are 13-3/4 inches deep
x 7 inches high (350mm x 178mm).
Model 7069 Slide Rack Mount with Handles - The Model
7069 is a sliding rack mount kit. It enables one Model 706 to be
rack mounted with the added feature of sliding the instrument
for easy access. The dimensions are 3-3/4 inches deep x 7
inches high (95mm x 178mm).
1.9 REPACKING FOR SHIPMENT
The Model 706 should be packed in its original carton. Before
packing, wrap the instrument in plastic. After it is placed in the
box, surround the instrument with Styrofoam packaging mate-
rial. Remove all cards and ship separate.
If the Model 706 is to be returned to Keithley Instruments for
calibration or repair, include the following:
l Write ATTENTION REPAIR DEPARTMENT on the address
label.
= Include the warranty status of the instrument.
l Photocopy and complete the service form at the back of this
manual and return it with the instrument.
1-2
+

SECTION 2
OPERATION
2.1 INTRODUCTION
Operation of the Model 706 is divided into two sections: front
panel operation and IEEE-488 bus operation. IEEEbus opera-
tion is located in Section 3. This section contains the follow-
ing information:
*Preparation for use
@Power Up
iEnvironmental Conditions
*Front and Rear Panels Description
@Examplesof Scanning
aFront Panel Programs
2.2 PREPARATION FOR USE
2.2.1 Correct Line Voltage
Connect the Model 706 to the proper power receptacle (refer
to Table 2-l). For fuse replacement or line voltage setting
refer to Section 5 Maintenance.
WARNING
Ground the instrument through a properly
earth grounded receptacle before opera-
tion. Failure to ground the instrument can
result in severe injury or death in the event
of a short circuit or malfunction.
2.2.2 Plug-In Card (Scanner) Installation
Before operating the Model 706, the appropriate scanner
cards must be installed into the mainframe. Each scanner
card (up to 10 cards per the Model 706 mainframejis installed
in-the appropriate vertical slot in the rear panel of the Model
706. Refer to Figure 2-l for an overall picture of scanner card
installation.
WARNING
To prevent a possible shock hazard, turn
the instrument off and disconnect the line
cord before installing/removing any scan-
ner card.
1. To install a scanner card, slide the card into the appropriate
vertical slot. The slots are numbered 1through 10. Refer to
Table 2-2 for slot number/ channel numbers assignment.
Facing the rear panel of the Model 706, the scanner card
component side should face the left side of the slot. Make
certain the card edges are aligned with the top and bottom
grooves in the slot.
2. Once the card is aligned with the grooves, insert the card
to its full depth into the Model 706. Make certain the card
is properly seated into the connector on the interconnect
board. When the card is fully inserted, the locking tabs on
the card should be placed in the locked position as shown
in Figure 2-1.
3. To remove a scanner card, first turn the Model 706 off and
disconnect the line cord. Unfasten the locking tabs by pull-
ing both tabs outward. Grasp the end of the card and pull it
out of the mainframe.
NOTE
Handle the scanner cards by the edges to avoid
contaminating them with dirt, body oil, etc.
WARNING
Do not insert scanner cards that have metal
clamps into the Model 706. Otherwise a
shock hazard will be present. Only use
scanner cards that have plastic clamps.
Table 2-2. Slot Number Channel Number Assignment
Table 2-l. Line Voltage Setting
Slot
Number
1
2
3
4
5
7”
ii
10
Channels
Included
l-10
11-20
2130
31-40
41-50
51-60
61-70
71-60
81-90
91-100
“Does not include other units in a daisy cha;
configuration see paragraph 2.5.4 example 4.
Input Jumper I Line Fuse FlOl . Varistor
Voltage Setting 3AG 5mm VR2
9OV-125v Installed 1.25A, 1.25A, installed
250V 250V
195v-250v Not 0.6A, 0.6A, not
Installed 250V 250V installed
2-l

LOCKING TABS
MODEL706 /
REAR PANEL
2.3 POWER UP
NDLES
SCANNER CARD
INSTALLATION
Figure 2-l. Scanner Card Installation
When the Model 706 is turned on the instrument goes
through a power up sequence that is outlined as follows:
Immediately after turing on the Model 706 via the power
switch, the display indicates the following for a number of
seconds:
1 1
1. This is a display test. The operator can note inoperative
display segments by comparing the Model 706’s display
with the figure above.
2. In addition, the pushbutton and the TALK, LISTEN and
REMOTE indicators turn on. All indicators turn on
simultaneously if operating correctly.
After the display test is complete, the Model 706 displays the
software revision level for approximately 0.5 seconds. The
following is an example of software revision level Al.
RI I
After the software revision level is displayed, the Model 706
displays the primary address of the instrument for approx-
imately 0.5 seconds. The primary address of the Model 706 is
factory set at 18.
r---r-q
During the display test the Model 706 performs a digital self
test of the RAM circuitry and a cyclic redundancy check
(CRC) of the ROM circuitry. If a problem is found by these
tests the Model 706 displays a diagnostic number. This
number and its meaning is described in detail in Section 5.
After all the displays and test of the power up sequence, the
Model 706 comes to the default conditions that are listed in
Table 2-3.
NOTE
If upon power up the Model 706 displays the
slave or no loop message (refer to paragraphs
2.9.11 and 2.9.12) activate Program 90 to return
the Model 706 to normal operating conditions.
To activate Program 90, press PRGM, 9, 0.
‘2-2

Table 2-3. Power Up Default Conditions (Front Panel Operation)
Function or
Program Default Conditions
CHANNEL Channel mode is selected, channel 1 is displayed and all channels are open.*
TIME Time is not affected by power up.
DATE Date is not affected by power up.
RESET Reset is not affected by power up.
INTERVAL Interval time is not affected by power up.
SINGLE Single scan mode is set to inactive.
CONTINUOUS Continuous scan mode is set to inactive.
START/STOP Start/Stop function is set to stop.
Program 0 Digital I/O outputs are set to 000, the inputs are not affected by power up.
Program 1 Date format is not affected by power up.
Program 2 Settle time is not affected by power up.
Program 3 Primary address is not affected by power up. ..
Program 4 Save relay set up is cleared from display but still in memory. Channel 1 is displayed.
Program 5 Recall relay set up is cleared from display but still in memory. Channel 1 is displayed.
Program 6 Number of poles is not affected by power up.
Program 7 Alarm time is set to 00.00.00.
Program 8 Self test is not activated.
Program 90 Program 90 is not affected by power up.
Program 91 Program 91 is not affected by power up.
Program 92 Program 92 is not affected by power up.
Program 93
Program 93 is set to inactive.
Program 94 Program 94 is not affected by power up.
Program 99 Program 99 is not affected by power up.
FIRST The first function is not affected by power up.
LAST The last function is not affected by power up.
CLOSE All channels are open.
OPEN All channels are open.
*If channel 1 was previously programmed as the first channel, last channel, both or neither, it is displayed as such.
The FIRST and LAST functions are not affected by power up.
To identify the previous state of the functions that are not af-
fected by power up simply activate the desired function.
When the function is activated the previous state for that
function is displayed. Refer to paragraph 2.5.1 for informa-
tion concerning the actuation of the desired function.
2.4 ENVIRONMENTAL CONDITIONS
All operation of the Model 706 should take place at an am-
bient temperature within the range of O°C to 50°C, up to
35OC at 80% noncondensing relative humidity. Environmen-
tal conditions for storage are -25OC to +65OC.
NOTE
If the Model 706 internal operating temperature
is higher than 75OC the thermal breaker on the
power supply will open up. This action will shut
down the Model 706. Refer to Section 5
paragraph 5.5.3.
2.5 OPERATING INSTRUCTIONS
2.5.1 Front Panel Controls
Table 2-4 lists all the front panel controls and buttons. Their
operation and function are briefly described in the table. For
complete details concerning the front panel controls refer to
paragraph 2.7. Refer to Figure 2-2 for a view of the front
panel controls.
2.5.2 Rear Panel Description
Table 2-5 lists all the rear panel connectors and terminals.
Their function and operation are briefly described in the table.
For complete details concerning the rear panel refer to
paragraph 2.8. Refer to Figure 2-3 for a view of the Model 706
rear panel.
2-3

Control
POWER ON/OFF
CHANNEL
CLOSE
OPEN
FIRST
LAST
RESET
INTERVAL
CONTINUOUS
SINGLE
START/STOP
PRGM
DATA
ENTER
CANCEL
TIME
DATE
TALK”
LISTEN*
REMOTE*
Table 2-4. Front Panel Controls
Description
Turns the unit on or off.
Selects channel mode, turns on the channel LED and displays channel information (e.g.
open or closed, first or last). Increments channel number by one each time it is acti-
vated when in the channel mode.
When activated the CLOSE button closes the presently displayed channel. Close is
indicated by a c on the far right digit of the display.
When activated the OPEN button opens the presently displayed channel. Open is indi-
cated by an o on the far right digit of the display.
When activated the FIRST button specifies the presently displayed channel as the first
channel of a multi channel configuration. First is indicated by an F in the middle of the
display. I-
When activated the LAST button specifies the presently displayed channel as the last
channel of a multi channel configuration. Last is indicated by an L on the display.
When activated the RESET button opens all channels and reverts the display to the
specified first channel.
The INTERVAL button selects the programmed interval time for display and turns on the
interval LED. The interval time is the programmed time each channel is closed in a
scanning sequence.
The CONTINUOUS button selects the continuous scan mode and turns on the
continuous LED. The continuous scan mode allows the user to scan through the
programmed channels in a continuous cycle upon the actuation of the START/STOP
button.
The SINGLE button selects the single scan mode and turns on the SINGLE LED.
The single scan mode allows the user to scan through the programmed channels
one time upon the actuation of the START/STOP button.
The START/STOP button when activated initiates the selected scan mode and turns
on the START/STOP LED. Pressing the button during a scan stops the scan sequence
and turns off the START/STOP LED. When not in the continuous or single scan modes the
START/STOP button activates the STEP scan mode. Refer to paragraph 2.5.4.
The PRGM (Program) button when activated shows a display that prompts the user to
select one of the 15 front panel programs. Refer to paragraph 2.9 for complete
details and examples of the front panel’programs.
The O-9 buttons allow entry of numerical data onto the display.
The ENTER button loads the displayed data for the interval time, channel number,
time, date and program modes into the Model 706.
During the entry of data (C segment cursor is flashing) the CANCEL button cancels
the present display and reverts the instrument to the previous display.
When activated the TIME button selects for display the 24 hour time clock and
turns on TIME LED.
When activated the DATE button selects the date mode for display and turns on
the DATE LED.
When lit the TALK LED indicates that the Model 706 is in the talk mode.
When lit the LISTEN LED indicates that the Model 706 is in the listen mode.
When lit the REMOTE LED indicates that the Model 706 is in the remote mode.
*Refer to Section 3 IEEE-488 bus operation.
.2-G:

I I . I

Table 2-5. Rear Panel Deswiption
Connections Description
Card Slots
SER. OUT
ALARM/SERIAL IN
CHANNEL READY
EXT. TRIGGER
DIGITAL I/O
IEEE-488 INTERFACE
CONNECTOR
FUSE
AC Power Receptacle
Each slot accepts one scanner card. There are a total of 10 slots.
The serial output connector is a female BNC connector that provides
connection to another Model 706 for a daisy chain configuration.
The alarm function of this female BNC connector outputs a pulse when the
programmed alarm time is reached. The serial in function is used in a
daisy chain configuration where serial in is connected to the serial out of
another Model 706.
This female BNC connector outputs a pulse at the completion of the pro-
grammed channel settling time.
This is a female BNC connector that initiates the selected scan mode upon
receiving the proper signal pulse.
The digital I/O port consists of 16 digital input/output lines along with four
lines that are +5V and IEEE common.
This standard connector provides connection to the IEEE-488 bus.
The line power fuse provides protection for the AC power line input and is
rated as shown in Table 2-l.
The line power receptacle mates with three wire line cord and applies the
line power to the instrument.
2.5.3 Basic Front Panel Operation
This section provides the information necessary for basic
front panel operation of the Model 706. There are a number
of steps to follow in order to get the Model 706 ready for
scanning operation. These steps are as follows:
1. Install the desired scanner card(s). Refer to paragraph 2.2.2
for information concerning the installation of the scanner
cards into the Model 706.
2. Select appropriate line voltage. Refer to Section 5
Maintenance for information concerning the selection of
appropriate line voltage and proper fuse rating.
3. Turn on the Model 706. The instrument then goes through
the power up sequence that is described in paragraph 2.3
and displays one of the following:
I[ (Normal Condition)
(Matrix Mode Refer to
I o 1 Paragraph 2 9 71
. .
NOTE
If upon power up the Model 706 displays the
slave or no loop message (refer to paragraphs
2.9.11 and 2.9.12) activate Program 90 to return
the Model 706 to normal operating conditions.
To activate Program 90, press PRGM, 9, 0.
NOTE
Channel 1 is set as the programmed first chan-
nel. If another channel was previously program-
med as the first or last channel, then the F or L
will not be displayed upon power up.
4. Program the desired channel. (Channel mode is selected
upon power up).
-
A. Select the first channel.
1. Press the desired channel number from the DATA
group buttons O-9.
2. Press the FIRST button to program the presently
displayed channel as the first channel.
NOTE
Selecting a channel that does not exist in the
present set up causes the Model 706 to display
the following message.
no Ch
B: Select the last channel.
1. Press the desired number from the DATA group but-
ton O-9.
2. Press the LAST button to program the presently
dispkyed channel as the last channel.
5. Program the number of poles (0, 1, 2 or 4).
A. Press PRGM.
B. Press 6.
C. Select number of poles (0, 1, 2 or 4).
D. Press ENTER.
NOTE
The 0 pole mode is the matrix mode. Refer to
paragraph 2.9.7 for complete details concerning
programming of the different poles.
6. Program the interval time.
A. Press the INTERVAL button to select interval mode for
display.
B. Enter the interval time on the display by pressing from

the DATA group the desired time, within the limits of
000.010 to 999.999 seconds.
C. Press the ENTER button.
7. Program the desired scan mode. Press the SINGLE or
CONTINUOUS button to select one of these two scanning
modes. To select the step scan mode press the CHANNEL
button.
Upon the actuation of the START/STOP button in step 9,
channel 1 is closed and the START/STOP LED is turned on.
Channel 1 remains closed for two seconds (programmed in-
terval rate) and then opens. The START/STOP LED turns off
and the Model 706 advances to the next channel.
8. Press the START/STOP button to start the scanning se-
quence. For the step mode press the START/STOP but-
ton each time a single channel is to be scanned.
To scan the remaining channels, press the START/STOP
button each time a channel is to be scanned. After the last
programmed channel is scanned the instrument reverts to the
first programmed channel and turns off the START/STOP
LED. At this point the step scan sequence may be activated
again by pressing the START/STOP button, if desired.
The previous steps 1 through 8, show a general procedure to
-get the Model 706 into a scanning sequence. Paragraph 2.5.4
shows how to use the different scan modes, how to daisy
chain several Model 706s for an extended number of chan-
nels and how to scan using different scanner cards.
To stop the scanning sequence and reset the Model 706 to
the programmed first channel simply press the RESET but-
ton. .-
2.5.4 Scanning Examples
Example 1 Manual Scan (Step Scan&If it is desired to
scan through the programmed channels manually the Model
706 can be programmed for the step scan mode. In the step
scan mode the programmed channels can be scanned (closed
for the programmed interval rate and then opened) one chan-
nel at a time. Upon the actuation of the START/STOP but-
ton a single channel will be scanned. For this example we will
choose the following parameters.
1. First channel is 1.
2. Last channel is 10.
Example 2 Single Scan-In the single scan mode all the
programmed channels are scanned sequentially one time
upon the actuation of the START/STOP button. The single
scan sequence operates as follows:
1. The START/STOP LED turns on.
2. The programmed first channel is closed for the pro-
grammed interval rate and then opened.
3. The Model 706 then advances to the next channel, closes
it for the programmed interval rate and then opens it.
4. This sequence is repeated up to and including the pro-
gammed last channel. At this point the Model 706 reverts
to the programmed first channel and turns off the
START/STOP LED.
3. Interval time is 2 seconds.
4. Number of poles is 2.
5. Use the step scan mode.
5. The single scan sequence is now complete.
Use the steps outlined in Table 2-6 to program the Model 706
for the preceding parameters. For the sake of simplicity we
will use the Model 7056 general purpose scanner card for this
example.
To help illustrate a single scan sequence we will choose the
following parameters. For the sake of simplicity we will use
the Model 7056 general purpose scanner card.
1. First channel is 5.
2. Last channel is 25.
3: Interval time is 0.5 seconds.
Table 2-6. Step Scan Example
Step Action Comments
1 Install the Model 7056 General Purpose Refer to paragraph 2.2.2.
Scanner Card into slot 1 of the Model
706.
2 Select appropriate line voltage and turn
on the Model 706.
3 Press PRGM, 6. Selects PROGRAM 6.
4 Press 2, ENTER. Selects the 2-pole mode, refer to para-
graph 2.9 for more information about
front panel programs.
i Press 0, 0, 1, FIRST. Programs channel 1 as the first channel. Press, 0, 1, 0, LAST. Programs channel 10 as the last channel.
7 Press INTERVAL, 0, 0, 2,0,0,0, ENTER. Programs the interval time for two seconds.
8 Press CHANNEL, RESET. Selects the channel mode for display and
reverts to the first channel.
9 Press START/STOP. Initiates the step scan mode.