Keithley 708 User manual

Model 708
Switching System
Instruction Manual
Contains Operating and Servicing information

WARRANTY
Keithley Instruments, Inc. warrants this product to bc free from defects in material and workmanship for a period of I year from date of
shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries,
diskcttcs, and documentation.
During the warranty period, we will, at our option, either repair or replace any product that proves to be defwtivc.
To cxercisc this warranty, write or call your local Kcithley representative, or contact Keithley headquarters in Cleveland, Ohio. You will
be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs
will bc made and the product returned, transportation prepaid. Repaired or replaced products xc warranted for the balance of the origi-
nel warranty period, or at least 90 days.
LIMITATION OF WARRANTY
This warranty dots not apply to defects resulting from product modification without Kcithley’s express written consent, or misuse of
any product or part. This warranty also does not apply to fuses, software, non-rcchargcablc batteries, damage from batcry lc&agc, 0~
problems arising from normal wear or failure to follow instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCI.UDING ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PROVIDED HEREIN ARE
BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDI-
RECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND
SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF
SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL
AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.
Keithley Instruments, Inc. - 28775 Aurora Road-Cleveland, OH 44139 - 216-248-0400 - Fax: [phone] - http://www.keithley.com

Model 708 Switching System
Instruction Manual
01996, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Second Printing. lunc 1997
Document Number: 708-90-01 Rev. R

Manual Print History
The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The Revision
Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are relcascd between Revi-
sions, contain important change information that the user should incorporate immediately into the manual. Addenda arc num-
bered sequentially. When a new Revision is created, all Addenda associated with the previous Revision of lhc manual are
incorporated into the new Revision of the manual. Each new Revision includes a revised copy of this print history page.
Kcvisim A (DocumentNamhcr708-901-01)....................................................................................Pcbruary
14%
AddendutnA (DncumentNumberX18-901-02)
.......................................................................................Mily ,996
*ddc”dumA ~““cumentNumber708~901-03~.
.......................................................................................July 1Wh
RWiSi””B (IhcumcntNunlhcr7”%9”1~“1).
..........................................................................................JU”C,997

The following safety precautions should he obsaved before using
this product and any associated instrumcnlation. Although some in-
struments and accessories would normally be used with non-baz-
ardous voltages, there arc situations where huardous conditions
may bc present.
This product is intended for USCby qualified personnel who rccog-
nirc shock hazards and are familiar with the safety precautions re-
quired to avoid possihlc injury. Read Lbc operating information
cardully before using the product.
The types of product users are:
Responsible body is the individual or group responsible for the USC
and maintenance of equipmcnt. and for ensuring that operators are
adequately trained.
Operators use tbc product for its intended function. They most hc
trained in electrical safety procedures and proper use of the inntru-
ment. They must bc protected from electric shock and contacl with
hazardous live circuils.
Maintenance personnel perform routine procedures on the product
to keep it operating, for example. setting tic line voltage or rcplac-
ing consumable materials. Maintenance procedures are described in
the manual. The procedures explicitly state if tbc operator may pw
form them Otherwise, they should be pcrformed only by service
p~IS”“d
Service personnel are trained to work on tivc circuits, and perform
saie installations and repairs of products. Only properly trained ser-
vice personnel may perform installation and service procedures.
Exercise cxtrome caution when a shock hazard is present. Lethal
voltage may be present on cable connector jacks or test fixtures. The
American National Standards Institute (ANSI) states that a shock
hazard exists when voltage levels greater than 30V RMS, 42.4V
peak, or 60VDC are present. A good safety practice is to Expect
that hazardous voltage is present in any unknown circuit beSore
measuring.
Safety Precautions
Users OShis product must be pro,ecwtt from elcclric shock ia illI
times. The responsible body must c~wrc dun oscr\ xc prcvcwxt
access and/or insutaled from every conneclion point. In some CIISLIS.
connections most bc cxposcd 10 polenlial buman COIIIWI. Product
users in these circunx~mccs must he trained to protect thcmsclvcs
from the risk ofelecLTic shock. If Ihc circuit is capable ofopcmling
al or above 1000 voids, no conductive part of the circuit may be
exposed.
Do not connect switching cards dircclty 10 unbmilcd power circuils.
They arc intended LO be used with impcdancc limilctl sourcc~.
NEVER connect switching cards directly to AC mains. When con-
nccting sources to switching cards. install prolectivc dcviccr 1o tiw
it fault currcn, and votragc to the card.
Bcforc operating an inswument, make sure lbc lint cord is connccl~
cd to a properly grounded power reccpt;~lc. Inspect the connecting
cables, test leads, and jumpers for possible wear. cracks. or breaks
before each use.
For maximum safety. do no, louch ,bc product, tcs, abler. or any
other instruments white power is appticd to the circuil under test.
ALWAYS remove power from the entire test syswm and discharge
any capecitars before: connecting or disconnccdng cabtcs or jump-
ers, installing or removing switching cards. or making internal
changes, such as installing or removing jumpers.
Do not touch any object that could provide a currcn~ petit to tbc
common side of tbc circuit under wrl or power line (earth) ground.
Always make m~~surcments with dry hands while standing on a
dry, insulated surface capahtc of withslanding the voltapc hciny
measured.

Do not exceed the maximum signal levels of the inslrumcnt~ and ac-
ccssories, as delined in the specilications and operating informa-
tion, and as shown on the instrumenl or at tixtorc pan&, or
switching card.
When fuses are used in a product, replace with same type and rating
lor continued proteclion agains, lirc hazard.
Chassis connecLions must only be used as shield connections lo1
measuring circuils, NOT as safely cart,, ground connections.
If you ax using a test fixture, keep the lid closed while powcr is ap-
plied to the device under test. Safe operation requires the use of a
lid intcll”ck.
Ifa @ ”LL~CWis prcscnt, connect it to safely earl,, ground using the
wire recommended in Ihe user documentation.
The A ! symbol on an instrument indicates Ihat the user should rc-
fcr t” the upcrating instructions located in the manual.
Then symbol on an instrument shows Iha, it can source or me&
sure 1000 dolts or more. including the combincd effect of normal
and commrln mode ““Itages. “se standard safety precautions LO
avoid personal contact with thcsc voltages.
The WARNING heading in a manual explains dangers that might
result in personal injury or death. Always read Lhe associated infor-
mation wry carefully before performing the indicated procedure.
The CAUTION heading in a manual explains hands tia~ could
damage the instrument. Such damage may invalidate the warranty.
Instrumentation and a~~~~sories shall not be connected LOhumans.
Beiore performing any maintenance, disconnecl Lhc lint cord and
all test cables.
TII maintain protection from electric shock and fire, rcplaccmcnt
components in mains circuits, including the power ~ransCormer, lest
Icads, and input jacks, must be purchased from Keithley lnstru-
mmts. Standard fuses, wilh applicable national safely approvals,
may hc used if the rating and type are the same. Other components
that are not salety related may be purchased from other suppliers as
long as they are equivalent to the original component. (Note that se-
lcclcd parts should bc purchased only through Keithley instruments
to maintain accuracy and funclionalily of the product.) If you am
unsure about the applicability of a replacement componen,, call II
Keithley Instruments oftice for informalion.
To clean the instrument, USC a damp cloth or mild, water based
cleaner. Clean the exterior or Lhe insLIumcnt only. Do not apply
cleaner directly to the instnun~nl or allow liquids to enter or spill
on the inslrument.

Specifications

Table of Contents
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.7.1
1.7.2
1.X
1.9
2 Card Installation
2.1
Introduction .......................................................................................................................................................... 2-l
2.2 Changing card installation access ....................................................................................................................... .2-l
2.3 Card ~nstallatlonlremoval..
..................................................................................................................................... 2-2
3
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.3
3.4
3.4.1
3.4.2
3.4.3
3.4.4
3.4.5
3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
General information
Introduction.. ........................................................................................................................................................ I I
Features ................................................................................................................................................................ I I
Warranty information ........................................................................................................................................... I -I
Manual addenda ................................................................................................................................................... I I
Safety symbols and tams I.................................................................................................................................... I
Specifications ....................................................................................................................................................... I-2
Unpacking and inspection.. .................................................................................................................................. I-?
Inspection ror damage
................................................................................................................................ I-2
Shipment contents ...................................................................................................................................... I-2
Repacking for shipment ....................................................................................................................................... I-2
Optional acCeSSorieS............................................................................................................................................. I-2
Getting Started
Introduction.. ........................................................................................................................................................ 3. I
Front panel famdmnzatlon....................................................................................................................................... 3-I
LED matrix ................................................................................................................................................ 3-2
Light pen connection.. ................................................................................................................................ 3-3
LED indicators ........................................................................................................................................... 3-3
Switches/connections.. ............................................................................................................................... 3-3
Rear panel familiarization.. .................................................................................................................................. 3-4
Card connections.. ................................................................................................................................................ 3-6
Overview - matrix design considerations ................................................................................................ 3-h
Connections - mstruments to rows ......................................................................................................... .3-6
ConnectIons - mstmments to columns .................................................................................................... 3-X
Connections -partial matrix expansion ................................................................................................... 3-X
Multiple application cards.......................................................................................................................... 3-8
,,
Expandmg matrix SIX.. ...................................................................................................................................... 3.10
Overview ~ multiple matrix expansion.. ............................................................................................... .3 IO
Backplane row expansion ........................................................................................................................ 3- I4
External expansion ................................................................................................................................... 3- 14
Control expansion using master/slave configuration ............................................................................... 3- I.5
System expansion issues. ......................................................................................................................... 3.18

3.5.6
3.5.7
35.8
3.6
3.6.1
3.6.2
3.6.3
3.6.4
4
4.1
4.2
4.3
4.3. I
4.3.2
4.3.3
4.3.4
4.3.5
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.5
4.5. I
4.52
4.6
4.6. I
4.6.2
4.6.3
4.6.4
4.6.5
4.6.6
4.6.7
4.6.8
4.7
4.7.1
4.7.2
4.8
4.x.1
4.X.2
4.8.3
4.8.4
4.8.S
4.9
5
5.1
5.2
5.3
Documenting system configuration ......................................................................................................... 3.18
Analog backplane cable construction. ..................................................................................................... 3.20
Sample expanded matrices ...................................................................................................................... 3.20
Bask?watching overview .................................................................................................................................. 3.24
Power-up.. ................................................................................................................................................ 3-24
Selecting make/break and break/make rows ............................................................................................ 3.24
Modifying a relay setup ........................................................................................................................... 3.24
Storing relay setup and applying setup to relays ..................................................................................... 3.24
Operation
Introduction.. ........................................................................................................................................................ 4-I
Setup date paths.. ................................................................................................................................................. 4-l
Power-up procedure.. ........................................................................................................................................... 4-2
Line power connections ............................................................................................................................. 4-2
Power switch.. ............................................................................................................................................ 4-2
Power-up self-test and error condltlons..
..................................................................................................... 4-2
Power-up c”nCigurati”n ............................................................................................................................. 4-3
Master/slave power-up ............................................................................................................................... 4-3
Display.. ............................................................................................................................................................... 4.4
Error LED .................................................................................................................................................. 4-4
IEEE-4X8 statns indicators ........................................................................................................................ 4-4
Crosspoint display LEDs ........................................................................................................................... 4-S
Light pen .................................................................................................................................................... 4-S
Crosspoint display ............................................................................................................................................... 4-6
Modifying.. ................................................................................................................................................ 4-6
Copying ...................................................................................................................................................... 4-h
Operation control ................................................................................................................................................. 4-7
Digital I/O ports.. ....................................................................................................................................... 4-7
External trigger.. ........................................................................................................................................ 4-X
Matrix ready “utput ................................................................................................................................... 4-X
Stand-alonc and master/slave .................................... ................................................................................ 4-9
IEEE-488 bus address.............................................................................................................................. 4.10
Hardware relay settling times .................................................................................................................. 4.10
Self-test.. .................................................................................................................................................. 4.10
Factory delaults ....................................................................................................................................... 4.10
Selecting switching parameters ......................................................................................................................... 4.10
Programmed settling times ...................................................................................................................... 4-l I
Make/break and break/make rows ........................................................................................................... 4-l I
Triggering .......................................................................................................................................................... 4-I I
Sources.. ................................................................................................................................................... 4-12
Overnm conditions .................................................................................................................................. 4.12
External trigger input ............................................................................................................................... 4.14
Matrix ready output ................................................................................................................................. 4.14
IEEE-48X bus triggering .......................................................................................................................... 4.15
Reset .................................................................................................................................................................. 4.15
IEEE-488 Programming
Introduction .......................................................................................................................................................... 5-l
IEEE-488 quick start............................................................................................................................................ 5-l
Bus cable connections .......................................................................................................................................... 5.3
ii

5.4
5.5
5.6
5.7
5.7. I
5.7.2
5.7.3
5.7.4
5.8
5.8. I
5.8.2
5.8.3
5.8.4
5.8.5
5.8.6
5.x.7
5.X.X
5.x.9
5.9
5.9.1
5.9.2
5.9.3
5.9.4
5.9.5
5.9.6
5.9.7
5.9.8
5.9.9
5.9.10
5.9.11
5.9.12
5.9.13
5.9.14
5.9. IS
59.16
5.9.17
5.9.18
5.9.19
S.9.20
5.9.21
5.9.22
5.9.23
5.9.24
5.9.25
5.9.26
5.10
5.1 I
6 Principles of Operation
6.1 Introduction.. ........................................................................................................................................................ h-l
6.2 Overview .............................................................................................................................................................. 6-l
6.3 Microcomputer ..................................................................................................................................................... 6-2
Interface function codes ....................................................................................................................................... 5-S
Primary address programming.. ........................................................................................................................... 5-S
QuickBASIC programming ................................................................................................................................. 5-6
Indicator and c”ntrol aspects “f IEEE-488 “pcration .......................................................................................... S-7
Error LED .................................................................................................................................................. s-7
Stetus indicators ......................................................................................................................................... S-X
I,OCAL/DIGITAL I/O key.. ...................................................................................................................... S-9
Concurrent front panel and bus operation .................................................................................................. S-LJ
Gcncral bus command pmgramming ................................................................................................................... S-<J
Ovcrvicw.. .................................................................................................................................................. S-9
REN (remote enable) ................................................................................................................................. 5.‘)
IFC (intcrfacc clear) ................................................................................................................................. S-IO
LLO (local lockout) ................................................................................................................................. S-10
GTL, (go t” local) ..................................................................................................................................... 5-10
DCL (dcvicc clear). .................................................................................................................................. s-10
SDC (selective dcvicc clear) .................................................................................................................... 5~IO
GET (group execute trigger) ................................................................................................................... .S~IO
SPE, SPD (serial polling) ......................................................................................................................... 5~10
Device-depcndcnt command (DDC) programming.. ......................................................................................... S-I I
-0vcrvicw .................................................................................................................................................. 5-l I
A . External trigger ................................................................................................................................ 5.15
B - Matrix ready .................................................................................................................................... S-I6
c - Close crosspoint .............................................................................................................................. 5-I 7
D - Digital Output .................................................................................................................................. S-17
E-Edit pointer.. .................................................................................................................................... S-IX
F - Enable/disable triggers.. ................................................................................................................... 5 I8
G - Data l’ormat
...................................................................................................................................... 5 I9
I -Insert blank setup.. ............................................................................................................................ S-24
J -Self-test.. ........................................................................................................................................... 5-24
K . EOI and hold-off.. ........................................................................................................................... S-24
L - Download setups
.............................................................................................................................. S-25
M - SRQ and serial poll byte ................................................................................................................. S-26
N ~ Open crosspoint.. ............................................................................................................................. S-28
0 - Digital output .................................................................................................................................. S-28
P - Clear crosspoints .............................................................................................................................. S-29
Q - Delete setup ..................................................................................................................................... S-29
R -Restore defaults ............................................................................................................................... S-30
S - Programmed settling time.. .............................................................................................................. S-30
T - Trigger ............................................................................................................................................. S-3 I
u . status.. 5-32
..............................................................................................................................................
V - Make/Break ..................................................................................................................................... S-36
W -Break/Make.. .................................................................................................................................. S-37
X - Exccutc 5-38
.............................................................................................................................................
Y - Terminator.. ..................................................................................................................................... S-38
z - copy setup ....................................................................................................................................... s-39
Relay command combinations ........................................................................................................................... S-40
Timing conslderatmns ........................................................................................................................................ s-41

6.3. I
6.3.2
6.3.3
6.4
6.4.1
6.4.2
6.5
6.5. I
h.S.2
65.3
6.5.4
6.6
6.7
6.7.1
6.7.2
6.8
6.9
6.10
7 Maintenance
7.1 Introduction.. ........................................................................................................................................................ 7-l
7.2 Fixed rack mstallatmn.
........................................................................................................................................... 7-l
7.3 Cover removal ..................................................................................................................................................... 7-4
7.4 Fuse replaccmcnt ................................................................................................................................................. 7-S
7.5 Battery replacement ............................................................................................................................................. 7-h
7.6 Digital I/O power selection (jumper W 101)
........................................................................................................ 7-7
7.7 Disassembly ......................................................................................................................................................... 7-X
7.8 Static sensitive devices ........................................................................................................................................ 7-8
7.9 Switching System troubleshooting .................................................................................................................... 7-10
7.9. I Recommended tat equipment.. .................................................. .
............................................................ 7 IO
7.9.2 Power-up selGtest .................................................................................................................................... 7-10
7.9.3 Power supply checks................................................................................................................................ 7-l I
7.9.4 Mother board checks................................................................................................................................ 7.11
7.9.5 Display checks.. ....................................................................................................................................... 7- I5
7.9.6 Using an extender card ............................................................................................................................ 7 I5
7.10 Handling and cleaning ....................................................................................................................................... 7 I5
8 Replaceable Parts
8.1 Introduction .......................................................................................................................................................... 8-l
8.2 Parts lists .............................................................................................................................................................. 8-l
8.3 Ordering information ........................................................................................................................................... 8-l
8.4 Factory service ..................................................................................................................................................... 8-l
8.5 Component layouts and schematics ..................................................................................................................... 8-I
A Card Configuration Worksheet
8
B.I
8.2
Reset c,rcu,t
................................................................................................................................................. 6-3
Address decoding ....................................................................................................................................... 6-3
Memory ...................................................................................................................................................... 6-3
Relay control c,rcu,try ......................................................................................................................................... 6-4
Switching card interface ............................................................................................................................ 6-4
Switching card logic .................................................................................................................................. 6-6
Display crcutry .................................................................................................................................................. 6-8
Display data ............................................................................................................................................. 6-l I
Front pilncl keys ....................................................................................................................................... 6-11
Display interface ........................................................................................................................... ........... 6-l I
Refresh display/read keyboard ................................................................................................................ 6-I I
Light pen interface.. ........................................................................................................................................... 6-12
Master/slave arcutry ........................................................................................................................................ 6-13
Serial cOmmu”lcat*“” .............................................................................................................................. h-13
Control signals ......................................................................................................................................... h- I4
Digital I/O .......................................................................................................................................................... 6 I4
IEEE-48X bus interface.. .................................................................................................................................... 6.14
Power supplies.. ................................................................................................................................................. 6.14
I/O Connections
Typical output connection schemes,.,,..,.......................,.......................,.....................,,,...................................... B-l
Typical input connection scheme ,,,,,.,..,............................................,.........................,,...................................... B-2
iv

C IEEE-488 Bus Overview
C.I
c.2
C.3
c.3.1
C.3.2
c.3.3
c.4
c.4. I
C.4.2
c.4.3
c.4.4
c.4.5
C.4.6
c.4.7
C.4.8
C.5
Introduclion.. ....................................................................................................................................................... C-I
Bus description.. .................................................................................................................................................. C-I
Bus lines .............................................................................................................................................................. c-3
Data lines.. ................................................................................................................................................. C-3
Bus management lines .............................................................................................................................. C-3
Handshake lines ........................................................................................................................................ (‘~3
Bus commands.. .................................................................................................................................................. C4
Unilinc commands .................................................................................................................................... C-J
Universal mulLilinc commands ................................................................................................................. C-5
commands.. ..............................................................................................................
...................................................................................................................................
Intcrhcc Cunction codes ...................................................................................................................................... C-R
”

2 Card Installation
Figure 2-l Model 708 switching system - changing switch card installation ,.............................................................. 2-2
Figure 2-2 Matrix card installalion .._................................................................................................................... _
T-3
3
Figure 3-l
Figure 3-2
Figure 3-3
Figure 3-4
Figure 3-5
Figure 3-6
Figure 3-7
Figure 3-8
Figure 3-9
Figure 3.10
Figure 3-l I
Figure 3. I2
Figure 3-I 3
Figure 3-14
Figure 3-15
Figure 3.16
Figure 3- 17
Figure 3. I8
4
Figure 4. I
Figure 4-2
Figure 4-3
Figure 4-4
Figure 4-S
Figure 4-6
Figure 4-7
Figure 4-8
Figure 4-9
Figure 4. IO
Figure 4-11
Figure 4- I2
Figure 4-13
Figure 4. I4
Figure 4-15
List of Illustrations
Getting Started
Model 708 front panel switches.. ................................................................................................................ .3-l
Setup data transfers ...................................................................................................................................... 3-2
Digital 110 status display.. ............................................................................................................................ 3-2
Front panel ................................................................................................................................................... 3-4
Model 708 rear panel ................................................................................................................................... 3-5
Connecting instruments to rows - single switching system ........................................................................ 3.7
Connecting instruments to rows - multiple (two) switching systems ......................................................... 3-7
Connecting instruments t” columns - multiple (two) switching systems..
.................................................. 3~Y
Partial matrix expansion example.. ........................................................................................................... .3 IO
Sample backplane expansion .................................................................................................................... .3 -1 I
Sample cxtcmal (I” backplane) expansion ................................................................................................. 3-12
Sample of master/slave interconnect cables five Model 708 switching systems..
.................................. 3 I6
Mastcdslave column locations.. ................................................................................................................. 3 I7
Analog backplane expansion connectors ................................................................................................... 3-20
Backplane expansion cable - five Model switching systems .................................................................... 3-21
External row expansion two stand-alone Model 708’s.. ......................................................................... 3-22
Sample backplane expansion ..................................................................................................................... 3-23
Partial matrix expansion example .............................................................................................................. 3-24
Operation
Paths for relay setup data ............................................................................................................................. 4-I
IEEE-488 status indicators.. ......................................................................................................................... 4-4
Crosspoint display LEDs .......................................................................................................................... ...4-5
Light pen ...................................................................................................................................................... 4-6
Pinouts .. dtgltel I/O ports ............................................................................................................................ 4-7
1nputl0utput conr,gurat1ons .......................................................................................................................... 4.7
Rear panel BNC jacks .................................................................................................................................. 4-8
Sample cxtemal trigger pulses ..................................................................................................................... 4-8
Sample matrix ready pulses ......................................................................................................................... 4-x
Master/sIavc connectors ............................................................................................................................ ...4- 9
Rear panel IEEE-488 address switches ..................................................................................................... 4-Y
IEEE-488 bus connector and rotary selection switches ............................................................................. 4-10
Timing without make/break and break/make rows.. ................................................................................. .4-12
Timing with either makclbrcak or break/make rows ................................................................................. 4-13
Timing with both make/break and break/make rows ................................................................................. 4- 14
vii

5 IEEE-488 Programming
Figure 5. I
Figure S-2
Figure S-3
Figure 5-4
Figure 5-5
t’igurc 5-6
Figure 5-7
Figure s-x
Figurc 5-9
Figure 5. IO
Figurc 5-11
Figurc 5-12
Figurc 5. I3
Figure S-I4
Figure 5. IS
Figurc S-I6
Figurc 5-17
Figure 5-18
Figure 5-19
Figure S-20
Figure S-21
Figure 5-22
Figure 5-23
Flowchart ol’cxamplc program .................................................................................................................... 5-2
IEEE-488 connector.. ................................................................................................................................... 5-3
IEEE-48X connections ................................................................................................................................. S-3
IEEE-488 connector location
5-4
........................................................................................................................
Contacl assignments .................................................................................................................................... 5-4
IEEE-488 bus connector and rotary sclcction switchcs.. ............................................................................. S-6
IEEE-488 indicllrors .....................................................................................................................................
5-8
Digital I/O status display mode
5-9
....................................................................................................................
External trigger pulse.. ............................................................................................................................... 5 I5
Matrix reedy pulse .....................................................................................................................................
S- I6
GO and Cl full output formats.. ................................................................................................................. S-21
G2 and G3 inspect output Cormats
............................................................................................................. S-22
G4 and G5 condensed output formats ....................................................................................................... 5-22
G6 and G7 binary output formats .............................................................................................................. S-23
SRQ mask and serial poll byte format.. ..................................................................................................... S-26
KEADY and MATRIX READY signal timing ......................................................................................... 5-3 I
UO machine status word .............................................................................................................................
5-33
Ul error status word .................................................................................................................................. 5-33
U3 relay step pointer .................................................................................................................................. 5-34
U4 number ot”slaves .................................................................................................................................. 5-35
U5 card idcn(lfxatmn................................................................................................................................... 5-35
U6 relay setthng tmx..................................................................................................................................
5-3s
U7 digital input .......................................................................................................................................... 5-36
6
Figure 6. I
Figurc 6-2
Figure 6-3
Figure 6-4
Figure 6-S
Figure 6-6
Figure 6-7
Figure 6-X
Figure 6-9
IFigure 6-10
Figure 6. I I
Figure 6. I2
7 Maintenance
Figure 7. I Rack mstalla~~on
............................................................................................................................................ 7-2
Figure 7-2 Screw and dress panel removal .................................................................................................................... 7-4
Figure 7-3 Fuse FAA250location.. .................................................................................................................................. 7-5
Figure 7-4 Shield removal ............................................................................................................................................. 7-6
Figure 7-5 W 101 jumper location ................................................................................................................................. 7-7
Figure 7-6 Model 708 exploded view ........................................................................................................................... l-9
Figure 7-7 Troubleshooting programs. ........................................................................................................................ 7-IO
Figure 7-8 Relay control wavcCorms
........................................................................................................................... 7-14
Figure 7-9 Display interface waveforms ..................................................................................................................... 7 I4
Principles of Operation
Model 708 block diagram ............................................................................................................................ 6-I
Digital board block diagram.. ...................................................................................................................... 6-2
RAM and battery backup ............................................................................................................................. 6-4
Matrix card interface simplified schematic ................................................................................................. 6-S
Matrix card interlaw timing diagram.. ........................................................................................................ 6-6
Typical matrix card logic block diagram ..................................................................................................... 6-7
IDDATA timing diagram ............................................................................................................................ 6-7
Display board block diagram ....................................................................................................................... 6-9
Display interface simplified schematic ........................................................................................................ 6-9
..
Light pen interface simph~xd schematic ...................................................................................................
6.12
..
Master/slave interface simphfied schematic .............................................................................................. 6- I3
Digital l/O interlace simplified schematic ................................................................................................. 6 I5

8
Figure B-I
Figure B-2
Figure B-3
Figure B-4
Figure B-5
C IEEE-488 Bus Overview
Figure C-l IEEE-488 bus configuration. ....................................................................................................................... C~?
Figure C-2 IEEE-48X handshake sequcncc ................................................................................................................... C3
Figure C-3 Command codes..
........................................................................................................................................ C-6
I/O Connections
Digital output, solenoid control .................................................................................................................. IS-I
Digital output, r&y control ........................................................................................................................ IS-I
Digital output, motor control ...................................................................................................................... B-2
Digital output, logic dcvicc control.. ........................................................................................................... B-2
Digital input, .... momtonng micro-swtchcs ................................................................................................... B-2
ix

3
Table 3-l
Table 3-2
Table 3-3
Table 3-4
Table 3-S
Table 3-6
Table 3-7
Table 3-X
Table 3-9
4 Operation
Table 4. I Setup data paths ........................................................................................................................................... J- I
Table 4-2 Power-up, reset, and factory defaults ........................................................................................................... J-3
Table 4-3 Error conditions.. ........................................................................................................................................ ..J~J
Table 4-4 Slave unit controls, indicators, and connections.. ........................................................................................ 4-9
Table 4-5 Make/break and break/make operation.. ................................................................................................... .4 -I I
5 IEEE-488 Programming
Table 5. I
Table 5-2
Table 5-3
Table 5-4
Table 5-5
Table S-6
Table 5-7
Table 5-8
Table 5-9
Table 5. IO
Table 5-I I
Tablc 5.12
Table S-13
Table S-14
Table 5.15
Sample strings.. ............................................................................................................................................ 5-2
Contact assignments ..................................................................................................................................... 5-4
..
Model 708 interlace lunclmn codes
............................................................................................................. S-5
BASIC IEEE-48X statements ....................................................................................................................... 5-6
IEEE-48X errors causing ERR LED to illuminate ....................................................................................... S-7
Digital input display format.. ....................................................................................................................... 5-9
Digital output display format ....................................................................................................................... 5-Y
General bus commands/BASIC statements 5.10
................................................................................................
Factory default, power-up, and DCL/SDC conditions.. ............................................................................. S-I I
Order of command execution.. ................................................................................................................... S-I?
DDC summary ........................................................................................................................................... 5.13
Master/slave setup example ....................................................................................................................... S-20
Byte counts for data format.. ..................................................................................................................... .5-21
..
Typical transnuss~on and hold-off times - stand-alone 5-42
..............................................................................
Typical transmission and hold-off times - master and one slave ............................................................. .5-43
List of Tables
Getting Started
Digital input display formats.. ...................................................................................................................... 3-3
Digital output display Ibrmats ...................................................................................................................... 3-3
IEEE-488 address switches. ......................................................................................................................... 3-5
Matrix and multiplexer cards ....................................................................................................................... 3-6
Row-column and column-column paths ...................................................................................................... 3-X
Matrix expansion.. J-13
.......................................................................................................................................
Model 708 external expansion cables ........................................................................................................ 3 I5
Rcsponsc time comparison ......................................................................................................................... 3 IX
Model 708 switching system card configuration worksheet ...................................................................... 3 IY
xi

6
Table 6-I
7 Maintenance
Table 7. I Recommended troubleshooting equipment ............................................................................................... 7-10
Table 7-2 Power supply checks..
................................................................................................................................ 7-l I
Table 7-3 Microcomputer checks
............................................................................................................................... 7-I I
Table 7-4 Relay control cheeks.................................................................................................................................. 7 I2
Table 7-5 Display interface checks ............................................................................................................................ 7- 12
Table 7-6 Digital I/O checks ...................................................................................................................................... 7- I2
Table 7-7 Light pen checks. ....................................................................................................................................... 7-13
Table 7-8 Master/slave checks ................................................................................................................................... 7- 13
Table 7-9 Display hoard checks.. ............................................................................................................................... 7-15
8 Replaceable Parts
Table S-1 Model 708 mother bead, parts list.. ............................................................................................................ 8-2
Table 8-2 Model 708 front panel control hoard, pats list ........................................................................................... 8-4
Table 8-3 Model 708 backplane board, parts list ......................................................................................................... R-4
Table X-4 Model 708 display hoard, parts list.. ............................................................................................................ 8-5
Table 8-5 Model 70X miscellaneous, parts list ............................................................................................................. 8-5
C IEEE-488 Bus Overview
Table C-l IEEE-48X bus command summary .............................................................................................................. C-4
Table C-2 Hexadecimal and decimal command codes.. ............................................................................................... C-5
Table C-3 Typical addressed command sequence
........................................................................................................ C-7
Table C-4 Typical addressed command sequence
........................................................................................................ C-7
Table C-5 IEEE command groups ................................................................................................................................ C-7
Table C-6 Model 708 interface function codes ............................................................................................................ C-X
Principles of Operation
Display segment assignments ..__.......__..................................,.............................................................. O-IO
xii

General Information
1.1 Introduction
This section contains general information about the Model
708 Switching System. The Model 708 is designed as a pro-
grammable switch for connecting signal paths in II matrix to-
pology. It is for applications requiring a small-scale matrix
(up to 96 crosspoints per mainhxme and 480 crosspoints per
master/slave configuration). Plug-in cards are available for
general and special purpose switching applications.
1.2 Features
Key features of the Model 708 Switching System are:
The switching system accepts one 7X7X switching card
(front or rear panel installation).
Digital I/O contained in the switching system (sixteen
inputs and outputs with internal pull-up resistors).
IEEE-488 bus or interactive programming.
Storage of 100 sets of relay setups, which can bc up-
loaded or downloaded through the IEEE-488 intcrfacc.
An active front panel LED display shows the present re-
lay status, a stored setup, or an editing scratchpad.
High-speed triggering of stored setups.
Makc/Lxeak and hrctimake switching programmable
matrix by rows. Operation is transparent and indcpen-
dent of the relay setup.
- Maximum matrix size of 8 rows by 60 columns (480
crosspoints on one IEEE-488 address with live units
connected in a mastcrlslave configuration).
- Scaled construction, low heat producing design elimi-
natcs vent holes, which is suitehlc for cleanrooms.
. An optional light pen is available for interactive control
of relays and editing stored relay setups.
1.3 Warranty information
Warranty information is located on the inside from cow-r ot
this manual. Should your Model 70X rcquirc warranty Serb
vice, contact your Kcitblcy rcprcscntativc or an iwtborizcd
repair facility in your arca for furtbcr information.
1.4 Manual addenda
Any improvements orchangcs concerning the switching sys-
tem or manual will he explained in ;m addendum 1%~sure 10
note these changes and incorpomtc them into the manual hc-
fore using or servicing the unit.
1.5 Safety symbols and terms
The following symbols and terms may hc found on an instni-
mcnt or used in this miuwal.
TheA. symbol on an instrument indicates that the user
should r&r to the opemting instructions located in the in-
struction manual.
The A. qymhol on an instrument shows that high voltage
may hc present on the terminal(s). USCstandard safety pre-
cautions to avoid personal contact with tbcse voltages.
The WARNING heading used in this manual cxplains da-
gers that might result in personal injury or death. Always
read the associated information wry carefully hcforc per-
forming the indicated procedure.
The CAUTION heeding used in this manual explains haz-
ads that could damage the instrument. Such damegc may in-
validate the warranty.
1-I

1.6 Specifications
Model 708 specifications axelocated at the front of this man-
ual. These spccifcations are exclusive “1 matrix card speci-
fications, which arc located in their appropriate instruction
manual.
1.7 Unpacking and inspection
1.7.1
Inspectionfor damage
Upon receiving the Model 708, carefully unpack the unil and
inspect it for any obvious signs of physical damage. Repon
any damage to the shipping agent immcdiatcly. Save the
original packing carton for possible future shipment. If in-
stalling a matrix card at this time, be sure to follow the addi-
tional handling precautions explained in the appropriate
matrix card instruction manual.
1.7.2 Shipmentcontents
The following items arc included with every Model 70X or-
der:
* Model 70X Switching System.
* Model 708 Instruction Manual.
. Fixed rack mount kit (includes mounting hardwax).
* Removable feet (for bench-top use - includes hard-
WWS).
* Additional accessories as ordered.
1.8 Repacking for shipment
Should it become necessary to return the Model 708 for rc-
pair, carefully pack the unit in its original packing carton or
the equivalent, and perform the following:
Call the Repair Department at I-800-552-1 115 for a
Repair Authorization (RMA) number.
Advise as to the warranty status of the switching sys-
tem.
Write ATTENTION REPAIR DEPARTMENT and the
RMA number on the shipping label.
Fill out and include the service form located at the back
of this manual.
1.9 Optional accessories
The following accessories are available for the Model 708.
Adapter and switching matrix cards
Model 7070 Universal Adapter Card - The Model 7070
card installs in the Model 708 and is jumper-sclcctablc for
use cilhcr as a backplane cxtcnder or a breadboard. It has
quick-disconnect screw terminals and IOft. ribbon cables.
Model 7071 General Purpose Matrix Card -The Model
7071 card has 8 rows by 12 columns of three-pole Form A
switching for general purpose applications. It has mass term
minated connectors in addition to quick-disconnect screw
terminals.
Model 7071-4 Dual 4 x 12 General Purpose Matrix Card
-The Model 707 I-4 card has two banks of four signal paths
of three-pole switching. Row and column connections to the
matrix are through 3X-pin mass terminated connectors.
Model 7072 Semiconductor Matrix Card - The Model
7072 card has 2 rows by 12 columns of two-pole Form A for
low cumxt switching, 4 rows by 12 c”lumn~ of two-pole
Form A for general purpose switching, and 2 rows by 12 col-
umns of one-pole Form A for C-V switching. IL has three-lug
triaxial connectors.
Model 7072-HV High Voltage Matrix Card -The Model
7072.HV switches low level, high vollage, and high impcd-
ante signals for semiconductor parametric tests. It has two
low current paths, four general purpose paths, and two C-V
paths. Connections to the matrix are through triax connec-
tors.
Model 7073 Coaxial Matrix Card - The Model 7073 card
has 8 rows by 12 columns of one-pole FormA switching (up
to 30MHz) for applications with single-ended instruments. It
has BNC connectors.
Model 7074-D Eight 1 x 12 General Purpose Multiplexer
Card - This card has eight banks “I’ one signal path of
three-pole switching. Bank connections are through four 75.
pin mass tenninatcd connectors; row connections are
through one 3X-pin mass terminated connector.
Model 7075 Eight 1 x 12 Two-Pole Multiplexer Card -
The Model 7075 is a general purpose multiplex switching
card that consists of tight banks of independent 1 x 12 mul-
tiplexer switching. Eight 25.pin D connectors are provided
Sorbank connections and one for row connections.
l-2

Model 7076 Dual 4 x 12 Two-Pole Matrix Card - The
Model 7076 is a general purpose matrix switching card that
consists of two indcpcndent 4 x 12 switching matrices. Each
matrix has two switched circuits (HI and GUARD). The four
row signal paths ‘ax connected through jumpcrs to the gen-
eral purpose analog backplane in the Model 708. Conncc-
tions to the matrix arc through standard 25.pin D connectors
for mass termination.
Model 7077 8 x 12 Isolated Coaxial Matrix Card - The
Model 7077 has 8 rows by 12 columns of two-pole Form A
switching for general purpose applications. It has BNC cot)-
nectars.
Model 7172 Low Current Matrix Card - The Model 7172
is for semiconductor I-V and C-V measurements. It is con-
tigurcd in an 8 x 12 matrix of two-pole switching with triax
connectors. An on-board elcctromcter measures offset cur-
rent.
Model 7173-50 4 x 12 High Frequency Matrix Card -
This card combines high frequency performance with
excellent DC switching characteristics. It provides 200MHz
bandwidth in a 4x12 matrix configuration. It has BNC
COll”eCt”TS.
Model 7174 8 x 12 Low Current Matrix Card- The Mod-
el 7 174 is designed for high pcrfommnce switching 01 I-V
and C-V signals. It has triax connccto~‘s.
Digital I/O cables
Model 7075-MTC Standard Cable ~ Standard 3m (IOft)
cable assembly terminated with 25.pin D-sub plugs on both
ends.
CS-400 Cable - 25.pin D-sub plug that will mate to the re-
ccptacles of the card. Solder-cup connections simplify the
building of custom cables.
CS-401 Cable- 25.contact D-sub receptacle that will mate
to the cables terminated with a 25-pin D-sub plug.
CS-590 Cable-Plastic backshell housing for CS-400.
Note: The following two cables are availahlc from 3M Cor-
poration.
8225-7000 (3M) Cable - 25.pin D-sub plug for customized
ribbon cahlc assemblies.
3357.9225 (3M) - Junction shell for 3M X225-7000 D-sub
plug.
Miscellaneous cables and accessories
Model 7007-l Shielded IEEE-488 Cables - The Model
7007-l connects the Model 708 to the IEEE-48X bus using
shielded cables to reduce clcctromagnetic intcrl’crcncc
(EMI). The Model 7007-I is Im (3.3ft) long imtl has im IIMI
shielded IEEE-48X connector at ci~h end. This cable is also
available in a 2111(6.6ft) length (Model 7007-2).
Model 7051.2 BNC to BNC Cables - The Model 705 I-2
makes connections to cxtcrnal trigger and matrix ready on
the Model 708 rear panel. The Model 705 I-2 is ii St)<>BNC
to BNC cable (RG58C), which is 0.611~(2ft) long. This cable
is also available in a ISm (5ft) length (Model 70.51-S).
Model 7078.PEN Programming Light Pen ~ The Model
7078.PEN connects to the Model 70X front pancl. It is used
to toggle the states of the LEDs that display crosspoints and
digital l/O. A pen holdcr is included.
Model 8501-l and 8501-2 Trigger Link Cables - The
Model 8501-l and X501-2 contain nn X-pin malt DIN con-
ncctor. The Model 8501-I is 1111(3.311) in Icngth. and the
Model X501-2 is 2111(6.61() in length. Multiple cahlcs arc
used for connecting Model 708 units in a mastcrlslavc con-
figuration through tbc rear panel mesterlslwc connectors.
Now The following backplane expansion component\ xc
availeblc from 3M Corporation.
Backplane expansion (20 pin cable components)
3365/20 (3M) - 2X AWG ribbon cable rated at >2oOVDC.
3461-001 (3M) - 0. I inch card-cdgc connector with a cur-
rent rating of IA z ZOOVDC (one connector required for
each Model 708).
3448-54 (3M) - Strain relief.
Backplane expansion (SOpin cable components)
3365/50 (3M) - 28 AWG ribbon cahlc rated at >2OOVDC.
3415-OOOl(3M) - 0. I inch card-edge conncxtor with ii cur-
rent rating of IA > 200VDC (one connector required fol
each Model 70X).
3448-54 (3M) - Strain relief.
I-3