Tektronix 707A Instruction Manual
Model 707A
Switching Matrix
Instruction Manual
707A-901-01 Rev. A / 9-98
Contains Operating and Servicing Information
W ARRANTY
Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of
shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries,
diskettes, and documentation.
During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.
To exercise this warranty, write or call your local Keithley representati v e, 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 be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for the balance of the original warranty period, or at least 90 days.
LIMIT A TION OF W ARRANTY
This warranty does not apply to defects resulting from product modification without Keithley’s express written consent, or misuse of
any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leakage, or
problems arising from normal wear or failure to follow instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING 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, INDIRECT , SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND
SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF
SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT 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 • 440-248-0400 • Fax: 440-248-6168 • http://www.keithley.com
CHINA: Keithley Instruments China • Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-62022886 • Fax: 8610-62022892
FRANCE: Keithley Instruments SARL • BP 60 • 3 Allée des Garays • 91122 Palaiseau Cédex • 33-1-60-11-51-55 • Fax: 33-1-60-11-77-26
GERMANY: Keithley Instruments GmbH • Landsberger Strasse 65 • D-82110 Germering, Munich • 49-89-8493070 • Fax: 49-89-84930759
GREAT BRITAIN: Keithley Instruments, Ltd. • The Minster • 58 Portman Road • Reading, Berkshire RG30 1EA • 44-1189-596469 • Fax: 44-1189-575666
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SWITZERLAND: Keithley Instruments SA • Kriesbachstrasse 4 • 8600 Dübendorf • 41-1-8219444 • Fax: 41-1-8203081
TAIWAN: Keithley Instruments Taiwan • 1FL., 85 Po Ai Street • Hsinchu, Taiwan • 886-35-778462 • Fax: 886-35-778455
Model 707A Switching Matrix
Instruction Manual
©1998, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
First Printing, September 1998
Document Number: 707A-901-01 Rev. A
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 released between Revisions, contain important change information that the user should incorporate immediately into the manual. Addenda are numbered sequentially. When a new Revision is created, all Addenda associated with the previous Revision of the manual are
incorporated into the new Revision of the manual. Each new Revision includes a revised copy of this print history page.
Revision A (Document Number 707A-901-01) ............................................................................ September 1998
All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand and product names are trademarks or registered trademarks of their respective holders.
Safety Precautions
The following safety precautions should be observed before using
this product and any associated instrumentation. Although some instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions
may be present.
This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury. Read the operating information
carefully before using the product.
The types of product users are:
Responsible body is the individual or group responsible for the use
and maintenance of equipment, and for ensuring that operators are
adequately trained.
Operators use the product for its intended function. They must be
trained in electrical safety procedures and proper use of the instrument. They must be protected from electric shock and contact with
hazardous live circuits.
Maintenance personnel perform routine procedures on the product
to keep it operating, for example, setting the line voltage or replacing consumable materials. Maintenance procedures are described in
the manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be performed only by service
personnel.
Service personnel are trained to work on live circuits, and perform
safe installations and repairs of products. Only properly trained service personnel may perform installation and service procedures.
Exercise extreme 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 bef ore
measuring.
Users of this product must be protected from electric shock at all
times. The responsible body must ensure that users are prevented
access and/or insulated from every connection point. In some cases,
connections must be exposed to potential human contact. Product
users in these circumstances must be trained to protect themselves
from the risk of electric shock. If the circuit is capable of operating
at or above 1000 volts, no conductive part of the circuit may be
exposed.
As described in the International Electrotechnical Commission
(IEC) Standard IEC 664, digital multimeter measuring circuits
(e.g., Keithley Models 175A, 199, 2000, 2001, 2002, and 2010)
measuring circuits are Installation Category II. All other instruments’ signal terminals are Installation Category I and must not be
connected to mains.
Do not connect switching cards directly to unlimited power circuits.
They are intended to be used with impedance limited sources.
NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective devices to limit fault current and voltage to the card.
Before operating an instrument, make sure the line cord is connected to a properly grounded power receptacle. Inspect the connecting
cables, test leads, and jumpers for possible wear, cracks, or breaks
before each use.
For maximum safety, do not touch the product, test cables, or any
other instruments while power is applied to the circuit under test.
ALWAYS remove power from the entire test system and discharge
any capacitors before: connecting or disconnecting cables or jumpers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.
Do not touch any object that could provide a current path to the
common side of the circuit under test or power line (earth) ground.
Always make measurements with dry hands while standing on a
dry, insulated surface capable of withstanding the voltage being
measured.
Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating information, and as shown on the instrument or test fixture panels, or
switching card.
When fuses are used in a product, replace with same type and rating
for continued protection against fire hazard.
Chassis connections must only be used as shield connections for
measuring circuits, NOT as safety earth ground connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use of a
lid interlock.
If a screw is present, connect it to safety earth ground using the
wire recommended in the user documentation.
!
The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.
The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined effect of normal
and common mode voltages. Use standard safety precautions to
avoid personal contact with these voltages.
The WARNING heading in a manual explains dangers that might
result in personal injury or death. Alw ays read the associated infor mation very carefully before performing the indicated procedure.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and
all test cables.
To maintain protection from electric shock and fire, replacement
components in mains circuits, including the power transformer, test
leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses, with applicable national safety approvals,
may be used if the rating and type are the same. Other components
that are not safety related may be purchased from other suppliers as
long as they are equivalent to the original component. (Note that selected parts should be purchased only through Keithley Instruments
to maintain accuracy and functionality of the product.) If you are
unsure about the applicability of a replacement component, call a
Keithley Instruments office for information.
To clean the instrument, use a damp cloth or mild, water based
cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill
on the instrument.
The CAUTION heading in a manual explains hazards that could
damage the instrument. Such damage may invalidate the warranty.
707A Switching Matrix Specifications
Overview
CAPACITY: Six plug-in cards per mainframe.
EXPANSION CAPACITY: Daisy-chain expansion of up to four Slave units with one
Master unit.
ANALOG BACKPLANES: Backplanes provide automatic row expansion between
similar cards within one mainframe.
DISPLAY:14-segment alphanumeric LED display, plus individual status LEDs.
MEMORY:Storage for 100 matrix setups, lithium battery backup.
PROGRAMMED SETTING TIME: 0 to 65 seconds in 1ms increments.
FRONT PANEL MENU: Digital I/O; External Trigger edge; Matrix Ready level; Master/
Slave operation; IEEE-488 address; Relay Settling Time; Self Test; Card Identify;
factory defaults.
TRIGGER SOURCES: External Trigger (TTL compatible, programmable edge, 600ns
minimum pulse width); IEEE-488 bus (TALK, GET, “X”); manual.
STATUS OUTPUT: Matrix Ready (TTL compatible, programmable high or low true):
goes false when relays are switched, true at end of Programmed Settling Time.
MAKE BEFORE BREAK, BREAK BEFORE MAKE: Programmable by row.
LIGHT PEN OPTION: Controls crosspoints, memories, make before break and break
before make. One light pen controls Master and all Slaves.
Execution Speed
MAXIMUM TRIGGER RATE: 200 setups per second (stepping through previously
stored setups with make-before-break and break-before-make disabled).
TRIGGER RESPONSE TIME:
External Trigger: <1ms.
IEEE-488 GET: <1ms.
RESPONSE TO IEEE-488 COMMAND (to close a single relay, excluding relay settling
time):
Stand Alone: <15ms.
Master and Four Slaves: <55ms.
DOWNLOAD TIME (one setup to 707A):
Stand Alone: 60ms typical.
IEEE-488 BUS IMPLEMENTATION
MULTILINE COMMANDS:DCL, LLO, SDC, GET, GTL, UNT, UNL, SPE, SPD
UNILINE COMMANDS: IFC, REN, EOI, SRQ, ATN.
INTERFACE FUNCTIONS: SH1, AH1, T6, TE0, L4, LE0, SR1, RL1, PP0, DC1, DT1, C0, E1.
PROGRAMMABLE PARAMETERS: All parameters programmable except for IEEE-
488 bus address and Master/Slave operating mode.
GENERAL
DIGITAL I/O (TTL compatible):
Data: 8 inputs, 8 outputs.
Control: Input Latch, Output Strobe.
REAR PANEL CONNECTORS:
Two BNC: External Trigger, Matrix Ready.
One DB-25: Digital I/O.
Two 8-pin DIN: Mater/Slave In, Mater/Slave Out.
One 6-pin Screw Terminal Plug: Relay Test.
ENVIRONMENTAL:
Operating: 0 to 50 C.
Storage: –25 to 65 C.
POWER: 100 to 240 VAC, 50–60Hz, 250VA maximum.
RELAY DRIVE: 5A minimum per card (slot).
EMC: Conforms with European Union Directive 89/336/EEC EN 55011,
EN 50082-1, EN 61000-3-3, FCC part 15 class B.
SAFETY: Conforms with European Union Directive 73/23/EEC EN 61010-1.
PHYSICAL: 356mm high ×432mm wide × 574mm deep (14 in × 17 in × 22.6 in). Net
weight without cards 16.5kg (36 lbs).
ACCESSORIES SUPPLIED: Instruction manual, power line cord, relay test
connector, fixed rack mounting hardware.
ACCESSORIES AVAILABLE:
Model 7078-PEN:Programming Light Pen (includes holder)
Model 7079: Slide Rack Mounting Kit
Model 7078-DIN: 8-pin DIN cable (Master/Slave), 1.8m (6ft.)
Specifications are subject to change without notice.
Table of Contents
1 General Information
1.1 Introduction ........................................................................................................................................................ 1-1
1.2 Features .............................................................................................................................................................. 1-1
1.3 Warranty information ......................................................................................................................................... 1-1
1.4 Manual addenda ................................................................................................................................................. 1-1
1.5 Safety symbols and terms .................................................................................................................................. 1-2
1.6 Specifications ..................................................................................................................................................... 1-2
1.7 Unpacking and inspection .................................................................................................................................. 1-2
1.7.1 Inspection for damage .............................................................................................................................. 1-2
1.7.2 Shipment contents..................................................................................................................................... 1-2
1.8 Repacking for shipment ..................................................................................................................................... 1-2
1.9 Optional accessories ........................................................................................................................................... 1-2
2 Card Installation
2.1 Installing and removing cards ............................................................................................................................ 2-1
3 Getting Started
3.1 Introduction ........................................................................................................................................................ 3-1
3.2 Front panel familiarization ................................................................................................................................. 3-1
3.3 Rear panel familiarization .................................................................................................................................. 3-6
3.4 Card connections ................................................................................................................................................ 3-8
3.5 Expanding matrix size ...................................................................................................................................... 3-10
3.5.1 Single unit expansion ............................................................................................................................. 3-10
3.5.2 Multiple unit expansion ......................................................................................................................... 3-16
3.5.3 System expansion issues ........................................................................................................................ 3-20
3.5.4 Documenting system configuration ....................................................................................................... 3-20
3.6 Basic switching operation ................................................................................................................................ 3-22
3.6.1 Power-up ................................................................................................................................................ 3-22
3.6.2 Selecting make/break and break/make rows .......................................................................................... 3-22
3.6.3 Modifying a relay setup ......................................................................................................................... 3-22
3.6.4 Storing setup and sending to relays ........................................................................................................ 3-23
i
4 Operation
4.1 Introduction ........................................................................................................................................................ 4-1
4.2 Setup data paths ................................................................................................................................................. 4-1
4.3 Power-up procedure ........................................................................................................................................... 4-2
4.3.1 Line voltage selection .............................................................................................................................. 4-2
4.3.2 Line power connections ........................................................................................................................... 4-2
4.3.3 Power switch ............................................................................................................................................ 4-2
4.3.4 Power-up self-test and messages ............................................................................................................. 4-2
4.3.5 Power-up configuration ........................................................................................................................... 4-3
4.3.6 Master/slave power-up ............................................................................................................................. 4-4
4.4 Displays and messages ...................................................................................................................................... 4-4
4.4.1 Alphanumeric display .............................................................................................................................. 4-4
4.4.2 Display messages ..................................................................................................................................... 4-5
4.4.3 IEEE-488 status indicators ...................................................................................................................... 4-6
4.4.4 Crosspoint display LEDs ......................................................................................................................... 4-6
4.4.5 Make/break and break/make LEDs ......................................................................................................... 4-8
4.4.6 Light pen .................................................................................................................................................. 4-8
4.5 Selecting crosspoint display ............................................................................................................................ 4-10
4.6 Modifying crosspoint display .......................................................................................................................... 4-10
4.7 Copying crosspoint display .............................................................................................................................. 4-11
4.8 Inserting and deleting stored setups ................................................................................................................. 4-12
4.9 Menu operations .............................................................................................................................................. 4-12
4.9.1 Digital I/O .............................................................................................................................................. 4-14
4.9.2 External trigger ...................................................................................................................................... 4-14
4.9.3 Matrix ready ........................................................................................................................................... 4-15
4.9.4 Stand-alone and master/slave ................................................................................................................ 4-16
4.9.5 IEEE-488 bus address ............................................................................................................................ 4-17
4.9.6 Relay (hardware) settling times ............................................................................................................. 4-18
4.9.7 Card labels ............................................................................................................................................. 4-18
4.9.8 Self-test .................................................................................................................................................. 4-18
4.9.9 Factory defaults ..................................................................................................................................... 4-18
4.10 Selecting switching parameters ....................................................................................................................... 4-19
4.10.1 Programmed settling time ...................................................................................................................... 4-19
4.10.2 Make/break and break/make rows ......................................................................................................... 4-19
4.11 Triggering ........................................................................................................................................................ 4-20
4.11.1 Trigger sources ...................................................................................................................................... 4-20
4.11.2 Front panel triggering ............................................................................................................................ 4-21
4.11.3 Trigger overrun conditions .................................................................................................................... 4-21
4.11.4 External trigger input ............................................................................................................................. 4-25
4.11.5 Matrix ready output ............................................................................................................................... 4-25
4.11.6 IEEE-488 bus triggering ........................................................................................................................ 4-25
4.12 Resetting .......................................................................................................................................................... 4-25
ii
5 IEEE-488 Programming
5.1 Introduction ........................................................................................................................................................ 5-1
5.2 IEEE-488 quick start .......................................................................................................................................... 5-1
5.3 Bus cable connections ........................................................................................................................................ 5-3
5.4 Interface function codes ..................................................................................................................................... 5-5
5.5 Primary address programming ........................................................................................................................... 5-6
5.6 QuickBASIC programming ............................................................................................................................... 5-7
5.7 Front panel aspects of IEEE-488 operation ....................................................................................................... 5-8
5.7.1 Front panel error messages ...................................................................................................................... 5-8
5.7.2 Status indicators ....................................................................................................................................... 5-9
5.7.3 Local key ................................................................................................................................................ 5-10
5.7.4 Concurrent front panel and bus operation .............................................................................................. 5-10
5.8 General bus command programming ............................................................................................................... 5-10
5.8.1 Overview ................................................................................................................................................ 5-10
5.8.2 REN (remote enable) ............................................................................................................................. 5-10
5.8.3 IFC (interface clear) ............................................................................................................................... 5-11
5.8.4 LLO (local lockout) ............................................................................................................................... 5-11
5.8.5 GTL (go to local) ................................................................................................................................... 5-11
5.8.6 DCL (device clear) ................................................................................................................................. 5-11
5.8.7 SDC (selective device clear) .................................................................................................................. 5-11
5.8.8 GET (group executive trigger) ............................................................................................................... 5-11
5.8.9 SPE, SPD ( serial polling) ...................................................................................................................... 5-11
5.9 Device-dependent command (DDC) programming ......................................................................................... 5-12
5.9.1 Overview ................................................................................................................................................ 5-12
5.9.2 A — External trigger .............................................................................................................................. 5-16
5.9.3 B — Matrix ready .................................................................................................................................. 5-17
5.9.4 C — Close crosspoint ............................................................................................................................ 5-18
5.9.5 D — Display .......................................................................................................................................... 5-18
5.9.6 E — Edit pointer .................................................................................................................................... 5-19
5.9.7 F — Enable/disable triggers ................................................................................................................... 5-19
5.9.8 G — Data format .................................................................................................................................... 5-20
5.9.9 H — Hit key ........................................................................................................................................... 5-25
5.9.10 I — Insert blank setup ............................................................................................................................ 5-26
5.9.11 J — Self-test ........................................................................................................................................... 5-26
5.9.12 K — EOI and hold-off ........................................................................................................................... 5-26
5.9.13 L — Download setups ............................................................................................................................ 5-27
5.9.14 M — SRQ and serial poll byte ............................................................................................................... 5-28
5.9.15 N — Open crosspoint ............................................................................................................................. 5-30
5.9.16 O — Digital output ................................................................................................................................ 5-30
5.9.17 P — Clear crosspoints ............................................................................................................................ 5-31
5.9.18 Q — Delete setup ................................................................................................................................... 5-31
5.9.19 R — Restore defaults ............................................................................................................................. 5-32
5.9.20 S — Programmed settling time .............................................................................................................. 5-32
5.9.21 T — Trigger ........................................................................................................................................... 5-33
5.9.22 U — Status ............................................................................................................................................. 5-34
5.9.23 V — Make/break .................................................................................................................................... 5-39
5.9.24 W — Break/make ................................................................................................................................... 5-39
5.9.25 X — Execute .......................................................................................................................................... 5-40
5.9.26 Y — Terminator ..................................................................................................................................... 5-41
5.9.27 Z — Copy setup ..................................................................................................................................... 5-41
5.10 Relay command combinations ......................................................................................................................... 5-42
5.11 Timing considerations ...................................................................................................................................... 5-43
iii
6 Principles of Operation
6.1 Introduction ........................................................................................................................................................ 6-1
6.2 Overall function description .............................................................................................................................. 6-1
6.3 Microcomputer .................................................................................................................................................. 6-1
6.3.1 Reset circuit ............................................................................................................................................. 6-1
6.3.2 Address decoding ..................................................................................................................................... 6-2
6.3.3 Memory .................................................................................................................................................... 6-4
6.4 Relay control circuitry ....................................................................................................................................... 6-4
6.4.1 Switching card interface .......................................................................................................................... 6-6
6.4.2 Switching card logic ................................................................................................................................ 6-6
6.5 Display circuitry .............................................................................................................................................. 6-10
6.5.1 Display data ........................................................................................................................................... 6-13
6.5.2 Front panel keys ..................................................................................................................................... 6-13
6.5.3 Display interface .................................................................................................................................... 6-13
6.5.4 Refresh display/read keyboard .............................................................................................................. 6-14
6.6 Light pen interface............................................................................................................................................ 6-14
6.7 Master/slave circuitry ...................................................................................................................................... 6-15
6.7.1 Serial communication ............................................................................................................................ 6-15
6.7.2 Control signals ....................................................................................................................................... 6-17
6.8 Digital I/O ........................................................................................................................................................ 6-17
6.9 IEEE-488 bus interface .................................................................................................................................... 6-17
6.10 Power supply ................................................................................................................................................... 6-19
7 Maintenance
7.1 Introduction ........................................................................................................................................................ 7-1
7.2 Line voltage sensing .......................................................................................................................................... 7-1
7.3 Fuse replacement ............................................................................................................................................... 7-2
7.4 Fixed rack installation ........................................................................................................................................ 7-2
7.5 Disassembly ....................................................................................................................................................... 7-5
7.6 Backplane jumpers ............................................................................................................................................. 7-7
7.7 Battery replacement ........................................................................................................................................... 7-9
7.8 Static-sensitive devices ...................................................................................................................................... 7-9
7.9 Mainframe troubleshooting ............................................................................................................................... 7-9
7.9.1 Recommended test equipment ............................................................................................................... 7-10
7.9.2 Power-up self-test .................................................................................................................................. 7-10
7.9.3 Power supply checks .............................................................................................................................. 7-10
7.9.4 Digital board checks .............................................................................................................................. 7-10
7.9.5 Display board checks ............................................................................................................................. 7-14
7.10 Using an extender card .................................................................................................................................... 7-16
7.11 Cleaning ........................................................................................................................................................... 7-16
7.11.1 Backplane .............................................................................................................................................. 7-16
7.11.2 Fan filter ................................................................................................................................................. 7-16
8 Replaceable Parts
8.1 Introduction ........................................................................................................................................................ 8-1
8.2 Parts lists ............................................................................................................................................................ 8-1
8.3 Ordering information ......................................................................................................................................... 8-1
8.4 Factory service ................................................................................................................................................... 8-1
8.5 Component layouts and schematics ................................................................................................................... 8-1
iv
A Card Configuration Worksheet
B IEEE-488 Bus Overview
B.1 Introduction ....................................................................................................................................................... B-1
B.2 Bus description .................................................................................................................................................. B-1
B.3 Bus lines ............................................................................................................................................................ B-3
B.3.1 Data lines ................................................................................................................................................. B-3
B.3.2 Bus management lines ............................................................................................................................ B-3
B.3.3 Handshake lines ...................................................................................................................................... B-3
B.4 Bus commands .................................................................................................................................................. B-4
B.4.1 Uniline commands .................................................................................................................................. B-4
B.4.2 Universal multiline commands ............................................................................................................... B-5
B.4.3 Addressed multiline commands .............................................................................................................. B-5
B.4.4 Address commands ................................................................................................................................. B-5
B.4.5 Unaddress commands ............................................................................................................................. B-5
B.4.6 Command codes ...................................................................................................................................... B-5
B.4.7 Typical command sequences .................................................................................................................. B-7
B.4.8 IEEE command groups ........................................................................................................................... B-7
B.5 Interface function codes .................................................................................................................................... B-8
v
List of Illustrations
2 Card Installation
Figure 2-1 Installing a matrix card .............................................................................................................................. 2-2
3 Getting Started
Figure 3-1 Model 707A front panel ............................................................................................................................. 3-2
Figure 3-2 Setup data transfers .................................................................................................................................... 3-3
Figure 3-3 Model 707A rear panel .............................................................................................................................. 3-7
Figure 3-4 Connecting instruments to rows ................................................................................................................. 3-8
Figure 3-5 Connecting instruments to columns ........................................................................................................... 3-9
Figure 3-6 Backplane buses ....................................................................................................................................... 3-10
Figure 3-7 Backplane expansion of analog bus #1 .................................................................................................... 3-11
Figure 3-8 Backplane expansion of analog bus #2 .................................................................................................... 3-12
Figure 3-9 Backplane expansion of analog bus #3 .................................................................................................... 3-13
Figure 3-10 Row connection examples ....................................................................................................................... 3-14
Figure 3-11 Example of partial matrix expansion ....................................................................................................... 3-15
Figure 3-12 Model 7071 row connections of stand-alone units .................................................................................. 3-16
Figure 3-13 Example of master/slave interconnect cables .......................................................................................... 3-17
Figure 3-14 Master/slave column locations ................................................................................................................. 3-18
Figure 3-15 Example of master/slave row expansion .................................................................................................. 3-19
4 Operation
Figure 4-1 Paths for relay setup data ........................................................................................................................... 4-1
Figure 4-2 Alphanumeric display ................................................................................................................................ 4-4
Figure 4-3 Crosspoint display ...................................................................................................................................... 4-7
Figure 4-4 Light pen .................................................................................................................................................... 4-9
Figure 4-5 Crosspoint display keys ........................................................................................................................... 4-10
Figure 4-6 Data entry keys ......................................................................................................................................... 4-11
Figure 4-7 Memory keys ............................................................................................................................................ 4-12
Figure 4-8 Digital I/O port ......................................................................................................................................... 4-14
Figure 4-9 Rear panel BNC jacks .............................................................................................................................. 4-14
Figure 4-10 Sample external trigger pulses ................................................................................................................. 4-15
Figure 4-11 Sample matrix ready pulses ..................................................................................................................... 4-15
Figure 4-12 Master/slave connectors ........................................................................................................................... 4-16
Figure 4-13 IEEE-488 bus connector .......................................................................................................................... 4-17
Figure 4-14 Switching keys ......................................................................................................................................... 4-19
Figure 4-15 Trigger keys ............................................................................................................................................. 4-20
Figure 4-16 Timing without make/break or break/make rows .................................................................................... 4-22
Figure 4-17 Timing with either make/break or break/make rows ............................................................................... 4-23
Figure 4-18 Timing with both make/break and break/make rows ............................................................................... 4-24
vii
5 IEEE-488 Programming
Figure 5-1 Flowchart of example program .................................................................................................................. 5-2
Figure 5-2 IEEE-488 connector ................................................................................................................................... 5-3
Figure 5-3 IEEE-488 connections ............................................................................................................................... 5-3
Figure 5-4 IEEE-488 connector location ..................................................................................................................... 5-4
Figure 5-5 Contact assignments .................................................................................................................................. 5-5
Figure 5-6 IEEE-488 indicators ................................................................................................................................... 5-9
Figure 5-7 LOCAL key ............................................................................................................................................. 5-10
Figure 5-8 External trigger pulse ............................................................................................................................... 5-16
Figure 5-9 Matrix ready pulse ................................................................................................................................... 5-17
Figure 5-10 G0 and G1 full output formats ................................................................................................................. 5-22
Figure 5-11 G2 and G3 inspect output formats ........................................................................................................... 5-23
Figure 5-12 G4 and G5 condensed output formats ..................................................................................................... 5-23
Figure 5-13 G6 and G7 binary output formats ............................................................................................................ 5-24
Figure 5-14 SRQ mask and serial poll byte format ..................................................................................................... 5-28
Figure 5-15 READY and MATRIX READY signal timing ....................................................................................... 5-33
Figure 5-16 U0 machine status word ........................................................................................................................... 5-35
Figure 5-17 U1 error status word ................................................................................................................................ 5-35
Figure 5-18 U3 relay step pointer ................................................................................................................................ 5-36
Figure 5-19 U4 number of slaves ................................................................................................................................ 5-37
Figure 5-20 U5 card identification .............................................................................................................................. 5-37
Figure 5-21 U6 relay settling time ............................................................................................................................... 5-37
Figure 5-22 U7 digital input ........................................................................................................................................ 5-38
Figure 5-23 U8 relay test input .................................................................................................................................... 5-38
6 Principles of Operation
Figure 6-1 Model 707A block diagram ....................................................................................................................... 6-2
Figure 6-2 Digital board block diagram ...................................................................................................................... 6-3
Figure 6-3 RAM and battery backup ........................................................................................................................... 6-5
Figure 6-4 Switching card interface simplified schematic .......................................................................................... 6-7
Figure 6-5 Switching card interface timing diagram ................................................................................................... 6-8
Figure 6-6 Typical switching card logic block diagram .............................................................................................. 6-8
Figure 6-7 IDDATA timing diagram .......................................................................................................................... 6-9
Figure 6-8 Display board diagram ............................................................................................................................. 6-11
Figure 6-9 Display interface simplified schematic .................................................................................................... 6-13
Figure 6-10 Light pen interface simplified schematic ................................................................................................. 6-14
Figure 6-11 Master/slave interface simplified schematic ............................................................................................. 6-16
Figure 6-12 Digital I/O interface simplified schematic ............................................................................................... 6-18
7 Maintenance
Figure 7-1 Captive nut installation .............................................................................................................................. 7-3
Figure 7-2 Nut bar on flange ....................................................................................................................................... 7-3
Figure 7-3 Chassis support sizing ................................................................................................................................ 7-4
Figure 7-4 Chassis support assembly .......................................................................................................................... 7-4
Figure 7-5 Right side view of disassembly ................................................................................................................. 7-5
Figure 7-6 Front view of disassembly ......................................................................................................................... 7-6
Figure 7-7 Backplane jumpers ..................................................................................................................................... 7-8
Figure 7-8 Troubleshooting programs ....................................................................................................................... 7-14
Figure 7-9 Relay control waveforms ......................................................................................................................... 7-15
Figure 7-10 Display interface waveforms ................................................................................................................... 7-15
viii
B IEEE-488 Bus Overview
Figure B-1 IEEE-488 bus configuration ...................................................................................................................... B-2
Figure B-2 IEEE-488 handshake sequence ................................................................................................................. B-3
Figure B-3 Command codes ........................................................................................................................................ B-6
ix
List of Tables
3 Getting Started
Table 3-1 Row-column and column-column paths .................................................................................................... 3-9
Table 3-2 Matrix and multiplexer cards ................................................................................................................... 3-13
Table 3-3 Model 707A external expansion cables ................................................................................................... 3-15
Table 3-4 Response time comparisons ..................................................................................................................... 3-20
Table 3-5 Model 707A card configuration ............................................................................................................... 3-21
4 Operation
Table 4-l Setup data paths ......................................................................................................................................... 4-2
Table 4-2 Power-up, reset, and factory defaults ......................................................................................................... 4-3
Table 4-3 Error messages ........................................................................................................................................... 4-5
Table 4-4 Information messages ................................................................................................................................ 4-6
Table 4-5 Menu operations ....................................................................................................................................... 4-13
Table 4-6 Status of slave unit controls ..................................................................................................................... 4-17
Table 4-7 Make/break and break/make front panel operation .................................................................................. 4-20
Table 4-8 Front panel messages for trigger sources ................................................................................................. 4-20
5 IEEE-488 Programming
Table 5-1 Sample strings ............................................................................................................................................ 5-2
Table 5-2 Contact assignments ................................................................................................................................... 5-5
Table 5-3 Model 707A interface function codes ........................................................................................................ 5-6
Table 5-4 Basic IEEE-488 statements ........................................................................................................................ 5-7
Table 5-5 Front panel IEEE-488 error messages ........................................................................................................ 5-8
Table 5-6 General bus commands/BASIC statements ............................................................................................. 5-11
Table 5-7 Factory default, power-up, and DCL/SDC conditions ............................................................................. 5-12
Table 5-8 Order of command execution ................................................................................................................... 5-13
Table 5-9 DDC summary ......................................................................................................................................... 5-14
Table 5-10 Master/slave setup example ..................................................................................................................... 5-21
Table 5-11 Byte counts for data format ...................................................................................................................... 5-22
Table 5-12 Typical transmission and hold-off times — stand-alone ......................................................................... 5-44
Table 5-13 Typical transmission and hold-off times — master and one slave .......................................................... 5-45
6 Principles of Operation
Table 6-1 Display segment assignments .................................................................................................................. 6-12
xi
7 Maintenance
Table 7-1 Line fuse values ......................................................................................................................................... 7-2
Table 7-2 Fixed rack parts .......................................................................................................................................... 7-2
Table 7-3 Recommended troubleshooting equipment ............................................................................................. 7-10
Table 7-4 Power supply checks ................................................................................................................................ 7-10
Table 7-5 Microcomputer checks ............................................................................................................................. 7-11
Table 7-6 Relay control checks ................................................................................................................................ 7-11
Table 7-7 Display interface checks .......................................................................................................................... 7-12
Table 7-8 Digital I/O checks .................................................................................................................................... 7-12
Table 7-9 Light pen checks ...................................................................................................................................... 7-13
Table 7-10 Master/slave checks ................................................................................................................................. 7-13
Table 7-11 Display board checks ............................................................................................................................... 7-14
8 Replaceable Parts
Table 8-1 Digital board assembly .............................................................................................................................. 8-2
Table 8-2 Display board assembly ............................................................................................................................. 8-3
Table 8-3 Backplane assembly ................................................................................................................................... 8-3
Table 8-4 Voltage regulator assembly ....................................................................................................................... 8-3
Table 8-5 Chassis assembly ....................................................................................................................................... 8-4
Table 8-6 Miscellaneous ............................................................................................................................................ 8-4
B
Table B-1 IEEE-488 bus command summary ............................................................................................................ B-4
Table B-2 Hexadecimal and decimal command codes ............................................................................................... B-5
Table B-3 Typical addressed command sequence ...................................................................................................... B-7
Table B-4 Typical common command sequence ........................................................................................................ B-7
Table B-5 IEEE command groups .............................................................................................................................. B-7
Table B-6 Model 707A interface function codes ........................................................................................................ B-8
xii
1
General Information
1.1 Introduction
This section contains general information about the Model
707A Switching Matrix. The Model 707A is designed as a
programmable switch for connecting signal paths in a matrix
topology. It is for applications requiring a large-scale matrix
(up to 576 crosspoints per mainframe and 2880 crosspoints
per master/slave configuration). Plug-in cards are available
for general and special purpose switching applications.
Section 1 is arranged as follows:
1.2 Features
1.3 Warranty Information
1.4 Manual Addenda
1.5 Safety Symbols and Terms
1.6 Specifications
1.7 Unpacking and Inspection
1.8 Repacking for Shipment
1.9 Optional Accessories
1.2 Features
• An active front panel LED display shows the current
relay status, a stored setup, or an editing scratchpad.
• High-speed triggering of stored setups.
• Make/break and break/make switching are programmable by rows. Operation is transparent to the user and
independent of the relay setup.
• With five units connected in a master/slave configuration, the maximum matrix size is eight rows by 360 columns (2880 crosspoints on one IEEE-488 address).
• An optional light pen is available for interactive controlling of relay states, editing stored relay setups, and
selecting make/break and break/make rows.
1.3 W arranty information
Warranty information is located at the front of this instruction manual. Should your Model 707A require warranty service, contact the Keithley representativ e or authorized repair
facility in your area for further information. When returning
the mainframe for repair be sure to fill out and include the
service form at the back of this manual to provide the repair
facility with the necessary information.
Key features of the Model 707A Switching Matrix include:
• The six-slot mainframe accepts any mix of 8-row by
12-column matrix cards.
• Rows are extended within the mainframe to minimize
system wiring and interconnect requirements.
• Storage of 100 sets of relay setups, which can be
uploaded or downloaded through the IEEE-488 interface.
1.4 Manual addenda
Any improvements or changes concerning the mainframe or
manual will be explained in an addendum included with the
unit. Be sure to note these changes and incorporate them into
the manual before using or servicing the unit.
1-1
General Information
1.5 Safety symbols and terms
The following symbols and terms may be found on an instrument or used in this manual:
!
The
should refer to the operating instructions located in the
instruction manual.
The
may be present on the terminal(s). Use standard safety precautions to avoid personal contact with these voltages.
The WARNING heading used in this manual explains dangers that could result in personal injury or death. Alw ays read
the associated information very carefully before performing
the indicated procedure.
The CAUTION heading used in this manual explains hazards that could damage the instrument. Such damage might
invalidate the warranty.
symbol on an instrument indicates that the user
symbol on an instrument shows that high voltage
1.6 Specifications
Model 707A specifications can be found at the front of this
manual. These specifications are exclusiv e of the matrix card
specifications, which are located in their appropriate instruction manual.
1.7 Unpacking and inspection
1.7.1 Inspection for damage
Upon receiving the Model 707A, carefully unpack it from its
shipping carton and inspect the unit for any obvious signs of
physical damage. Report any damage to the shipping agent
immediately. Save the original packing carton for possible
future reshipment.
1.7.2 Shipment contents
The following items are included with every Model 707A
order:
• Model 707A Switching Matrix
• Model 707A Instruction Manual
• Power line cord
• Relay test connector
• Fixed rack mounting hardware
• Additional accessories as ordered
1.8 Repacking for shipment
Should it become necessary to return the Model 707A for
repair, carefully pack the unit in its original packing carton
or the equivalent, and include the following information:
• Call the repair department at 1-800-552-1115 for a
Repair Authorization (RMA) number.
• Advise as to the warranty status of the mainframe.
• 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 av ailable for the Model 707A:
Model 7070 Universal Adapter Card — The Model 7070
card installs in the Model 707A and is jumper-selectable for
use either as a backplane extender or a breadboard. It has
quick disconnect screw terminals and 10-ft. ribbon cables.
Model 7071 General Purpose Matrix Card — The Model
7071 card has 8 rows by 12 columns of 3-pole Form A
switching for general purpose applications. It installs in the
Model 707A and has mass terminated connectors in addition
to quick-disconnect screw terminals.
Model 7071-4 General Purpose Matrix Card — The Model
7071-4 card has dual 4 rows by 12 columns of 3-pole Form
A, which is also configurable as 8 rows by 12 columns of 3pole Form A or 4 rows by 24 columns of 3-pole Form A. It
installs in the Model 707A and has 38 pin quick disconnect
connectors.
Model 7072 Semiconductor Matrix Card — The Model 7072
card has 2 rows by 12 columns of 2-pole Form A for lo w current switching, 4 rows by 12 columns of 2-pole Form A for
general purpose switching, and 2 rows by12 columns of
1-pole Form A for C-V switching. It installs in the Model
707A and has 3-lug triaxial connectors.
Model 7072-HV Semiconductor Matrix Card — The Model
7072-HV card has 2 rows by 12 columns of 2-pole Form A
for low current paths to jumpers, 4 rows by 12 columns of 2pole Form A for general purpose paths to the backplane, and
2 rows by 12 columns of 1-pole Form A for C-V paths to
jumpers. It installs in the Model 707A and has 3-lug triaxial
connectors.
1-2
General Information
Model 7073 Coaxial Matrix Card — The Model 7073 card
has 8 rows by 12 columns of 1-pole Form A switching (up to
30MHz) for applications with single-ended instruments. It
installs in the Model 707A and has BNC connectors.
Model 7074-D General Purpose Multiplexer Card — The
Model 7074-D card has eight banks of 1 row by 12 columns
of 3-pole Form A. Adjacent banks can be connected together
or jumpers can be removed to isolate any bank from the
backplane. It installs in the Model 707A and has four 75 pin
bank connections and one 38 pin connector for row connections.
Model 7075 2-Pole Multiplexer Card — The Model 7075
card has eight banks of 1 row by 12 columns of 2-pole Form
A. Adjacent banks can be connected together or jumpers can
be removed to isolate any bank from the backplane. It installs
in the Model 707A and has nine 25 pin subminiature D connectors, eight for bank connections and one for row connection.
Model 7076 Dual 2-Pole Matrix Card — The Model 7076
card has dual 4 rows by 12 columns of 2-pole Form A, which
is also configurable as 8 rows by 12 columns of 2-pole Form
A. Jumpers can be removed to isolate any bank from the
backplane. It installs in the Model 707A and has three 25 pin
subminiature D connectors, two for column connection and
one for row connection.
Model 7077 Isolated Coaxial Matrix Card — The Model
7077 card has 8 rows by 12 columns of 2-pole Form A. It
installs in the Model 707A and has BNC connectors.
Model 7078-DIN 8-pin DIN Cable — The Model 7078-DIN
cable has two 8-pin circular (DIN) connectors and is 1.8m (6
ft.) long. Multiple cables are used for connecting Model
707A units in a master/slave configuration through the rear
panel master/slave connectors.
Model 7078-PEN Programming Light Pen — The Model
7078-PEN connects to the Model 707A front panel. It is used
to toggle the states of crosspoint LEDs, make/break LEDs,
and break/make LEDs. A pen holder is included.
Model 7079 Slide Rack Mounting Kit — The Model 7079
kit consists of two sets of support brackets, equipment slides,
and hardware for mounting the Model 707A in a standard
19-inch equipment rack or cabinet.
Model 7007 Shielded IEEE-488 Cables — The Model 7007
connects the Model 707A to the IEEE-488 bus using
shielded cables to reduce electromagnetic interference
(EMI). The Model 7007-1 is one meter (3.3 ft.) long and has
an EMI shielded IEEE-488 connector at each end. The
Model 7007-2 cable is identical to the Model 7007-1, but is
2m (6.6 ft.) long.
Model 7051 BNC to BNC Cables — The Model 7051 cables
are for making connections to External Trigger and Matrix
Ready on the Model 707A rear panel. The Model 7051-2 is
a 50 Ω BNC to BNC cable (RG-58C), which is 0.6m (2 ft.)
long. The Model 7051-5 cable is identical to the Model
7051-2, but is 1.5m (5 ft.) long.
Model 7172 Low Current Matrix Card — The Model 7172
card has 8 rows by 12 columns of 2-pole Form A. Expanding
the columns can be done internally by connecting the rows
of multiple 7172 cards together with coax jumpers. It installs
in the Model 707A and has 3-lug triaxial connectors.
Model 7173-50 High Frequency 2-Pole Matrix Card — The
Model 7173-50 card has 4 rows by 12 columns of 2-pole
Form C with row isolators. It installs in the Model 707A and
has BNC connectors.
Model 7174A Low Current Matrix Card — The Model
7174A card has 8 rows by 12 columns of 2-pole Form A.
Expanding the columns can be done internally by connecting
the rows of multiple 7174A cards together with coax jumpers. It installs in the Model 707A and has 3-lug triaxial connectors.
Model 8000-14 Enclosures — The Model 8000-14 is a
19”-wide by 14”-high open-backed steel enclosure. It is supplied with hardware to mount a bench-top Model 707A The
top cover of the enclosure can be removed to access jumpers
between cards installed in a Model 707A.
1-3
2
Card Installation
2.1 Installing and removing cards
Before operating the Model 707A in a test environment,
matrix cards (up to six per mainframe) must be installed into
the mainframe. Note that matrix cards are not necessary to
program setups. Setups for master/slave configurations can
be programmed as long as the MASTER/SLAVE OUT to
MASTER/SLAVE IN loop connections are present. (See
paragraph 3.5.2.)
WARNING
Before installing/removing cards or
making card connections, turn off mainframe power and disconnect the line
cord. Also, ensure that no power is
applied from the user's circuit.
Install a card in the Model 707A as follows, using Figure 2-1
as a guide. Instructions specific to each card can be found in
the appropriate card manual.
CAUTION
Do not touch the card surfaces, connectors, or components to avoid contamination that could degrade card
performance.
2. Remove the slot cover from the desired slot.
3.
With one hand grasping the card's handle, and the other
supporting its weight, line up the card with the card
guides in the slot. Ensure that the component side is facing the fan of the mainframe.
4. Slide the card into the mainframe until it is fully seated
in the backplane connectors. Finger-tighten the springloaded mounting screws at the back of the card to lock
it in place.
WARNING
The mounting screws must be secured to
ensure a proper chassis ground connection between the card and the mainframe. Failure to properly secure this
ground connection may result in personal injury or death due to electric
shock.
NOTE
Some cards have connectors that are inaccessible once the card is fully inserted into
the mainframe (e.g., the quick disconnect
terminal blocks on Model 7071 cards). In
these cases, connect wires to the row and
column terminal blocks before seating it in
the backplane connectors.
1. Ensure that the access door on top of the mainframe is
fully closed and locked down. (The bottom side of the
access door has card guides.)
2-1
Card Installation
NOTE
The SMB coax jumpers used between
Model 7072 cards do not have to be
installed before the cards are inserted. Use
the access door on top of the mainframe
for this purpose. (Because of the access
door, the Model 7079 slide rack kit is recommended for rack-mounted units.)
5. To remove a matrix card, first turn off the mainframe
and disconnect the line cord. Ensure no voltage is
applied from the user's circuit. Remove any internal
cabling between cards through the unit's access door.
Loosen the spring-loaded mounting screws and pull out
the card by its handle.
Figure 2-1
Installing a matrix card
2-2
3
Getting Started
3.1 Introduction
This section contains introductory information on operating
your instrument and is intended to help you get your Model
707A up and running as quickly as possible. It includes a
brief description of operating controls and connections.
Once you are familiar with the material presented here, refer
to Section 4 for more detailed information.
Section 3 is organized as follows:
3.2 Front Panel Familiarization: Briefly describes each
front panel control and outlines display operations.
3.3 Rear Panel Familiarization: Outlines each aspect of
the Model 707A rear panel, including connectors.
3.4 Card Connectors: Describes where to connect instru-
ments and DUTs to the matrix rows and columns.
3.5 Expanding Matrix Size: Discusses methods for
expanding the matrix, both internal to the mainframe
and with multiple units.
3.6 Basic Switching Operation: Provides a general proce-
dure for powering up the Model 707A, choosing make/
break or break/make operation, modifying the crosspoint display, storing the setup, and sending the setup to
the relays.
3.2 Front panel familiarization
An overview of the Model 707A operation is gi ven in the following paragraphs. The front panel of the instrument is
shown in Figure 3-1. Figure 3-2 illustrates setup data transfers within the Model 707A. This pictorial will be helpful in
understanding the operations of individual front panel keys.
All front panel keys except POWER are momentary contact
switches. Some keys have an LED to indicate the selected
function. The keys are color coded into functional groups for
ease of operation.
3-1
Getting Started
Figure 3-1
Model 707A front panel
3-2
Getting Started
Model 707A
Internal
Memory
Stored
Setup #100
Stor ed
Setup #1
Crosspoint Relays
Model 7X7X
Matrix Cards
Model 707A
Front Panel
Crosspoint Display
Figure 3-2
Setup data transfers
3-3
Getting Started
POWER — AC power switch turns the unit on or off.
Crosspoint display group
MEMORY — Displays a stored relay setup (from location
shown in MEMORY STEP field) on the crosspoint display
and lights the MEMORY indicator.
RELAYS — Displays the current relay setup on the cross-
point display and lights the RELAYS indicator.
CROSSPOINT DISPLAY MODIFIED — Lights when
changes are made to the crosspoint display (by front panel
keys or light pen), making it different from the original
configuration.
COPY DISPLAY → MEMORY — Copies the displayed
cross-point configuration to the location shown in the MEMORY STEP field.
COPY DISPLAY → RELAYS — Copies the displayed
cross-point configuration to the relays.
AUTOMATIC (COPY DISPLAY → RELAYS) — When
this LED is lit, any change to the crosspoint display is sent to
the relays at the same time. The pushbutton toggles the LED
on and off .
DELETE — Deletes the setup at the location shown in the
MEMORY STEP field. Moves higher stored setups down
one memory location.
MENU — Steps through the available menu items.
• View digital input, program digital output.
• Select whether rising or falling edge of External Trigger
pulse triggers Model 707A.
• Select an active high or active low Matrix ready output
signal.
• Select master/slave or stand-alone operation.
• Program IEEE-488 address.
• View longest relay setting time of present card
configuration.
• Vie w unit configuration by slot number and card model
number.
• Execute self-test.
• Restore factory defaults (and clear stored setups).
Programmable parameters can be changed with the
SCROLL or data entry keys and then pressing enter.
Switching group
Scroll group
SCROLL — If MEMORY indicator is lit, increments
MEMORY STEP field and displays setup on crosspoint
LEDs. If RELAYS indicator is lit, increments RELAY STEP
field, displays setup on crosspoint LEDs, and sends setup to
relays. Also used for scrolling up through a list of multiple
choice parameters.
SCROLL — Same actions as the SCROLL key
except that it increments and scrolls down.
Memory group
INSERT — Inserts a blank setup at the location shown in
the MEMORY STEP field. Moves higher stored setups up
one memory location.
SETTLING TIME — Displays the current value of pro-
grammed settling time. (This delay begins after the relay settling time.) T o change the v alue, enter between 0-65000msec
and press ENTER.
MAKE/BREAK — Selects rows to operate as make/break
(make-before-break) for all setups. First enter row designation (A-H), then press MAKE/BREAK to toggle the state for
that row and immediately reprogram the Model 707A for the
new operation.
BREAK/MAKE — Same action as MAKE/BREAK except
that it selects break/make (break-before-make) rows.
(Selecting a row for break/make de-selects it for make/break
and vice versa.)
LOCAL — When in remote (REMOTE on), returns the
Model 707A to local mode (REMOTE off). It restores operation of other front panel controls unless LLO (Local Lockout) is in effect.
3-4
Getting Started
Trigger group
ENABLE — Toggles between triggers enabled and triggers
disabled. When triggers are enabled, the LED is lit.
SOURCE — Displays current trigger source. Use SCROLL
keys to display sources, then press ENTER to select the
desired source:
TRIG ON TALK - IEEE talk command
TRIG ON GET - IEEE GET command
TRIG ON X - IEEE X command
TRIG ON EXT - External trigger pulse (rear panel
input)
TRIG ON KEY - Front panel MANUAL key only
MANUAL — Generates a trigger from front panel if trig-
gers are enabled (no matter which trigger source is selected).
If the trigger source is TRIG ON KEY, only the MANUAL
key generates a trigger.
DATA ENTRY (A-H, 0-9) — These keys are for entering
row/column addresses and setup locations, selecting make/
break and break/make rows, and entering various numeric
values.
CANCEL — If the value in the alphanumeric display has
been modified, this key restores the current parameter value.
If the value in the alphanumeric display has not been modified, this key returns the Model 707A to the previous display.
CANCEL also exits from menu mode if no changes have
been made.
ENTER — If the value in the alphanumeric display has been
modified, pressing this key stores the parameter value. Also
invokes immediate action items from the menu and exits
menu mode (except when digital I/O is displayed).
CLOSE — Same action as OPEN key except that it turns on
the crosspoint LED and relay.
ALPHANUMERIC DISPLAY — A 14-character display
that can show:
• Error messages.
• Menu item selections.
• Last setup sent from memory to the relays (RELAY
STEP field).
• Last setup recalled from memory to the crosspoint display (MEMORY STEP field).
• Trigger source.
• Programmed settling time.
• Alphanumeric key presses (row/column addresses,
setup locations).
IEEE-488 status indicators
T ALK, LISTEN, REMOTE — These three LED indicators
apply to instrument operation over the IEEE-488 bus. The
TALK and LISTEN indicators show when the unit has been
addressed to talk or listen. REMOTE turns on to show when
the unit is in the IEEE-488 remote state. See Section 4 for
detailed information on operation over the bus.
CROSSPOINT DISPLAY LEDs — Show open and closed
crosspoints of the current relay setup, a stored relay setup, or
an edited relay setup. Each LED block of 8 rows by 12 columns shows on/off states of one card. States can be changed
by front panel keys, triggers, or optional light pen. Crosspoint configurations can be stored in memory or sent to
relays.
RESET — Performs the same functions as cycling power
(all relays are opened, triggers are disabled, RELA Y STEP to
000, MEMORY STEP to 001, etc.), except powerup selfchecking and master/slave loop initialization.
CLEAR — Turns off all crosspoint display LEDs. If the
AUTOMATIC (COPY DISPLAY → RELAYS) indicator is
lit, all relays are opened immediately.
OPEN — Turns off crosspoint LED of row/column shown
on alphanumeric display. If the AUTOMATIC (COPY DISPLAY → RELAYS) indicator is lit, the corresponding relay
opens immediately.
MAKE/BREAK ROW LEDs — Show which rows are
selected for make/break operation. The LEDs can be turned
on or off by the MAKE/BREAK, BREAK/MAKE keys or by
an optional light pen.
BREAK/MAKE ROW LEDs — Same function as MAKE/
BREAK row LEDs except for showing which rows are
selected for break/make operation. Note that selecting a row
for break/make de-selects it for make/break and vice versa.
LIGHT PEN — An optional input device for toggling the
on/off state of the Crosspoint Display LEDs, MAKE/
BREAK row LEDs, and BREAK/MAKE row LEDs. One
light pen is used. to control the LEDs of up to five Model
707A mainframes.
3-5
Getting Started
3.3 Rear panel familiarization
An overview of the rear panel of the Model 707A is in the
paragraphs that follow. The rear panel is shown in Figure
3-3. In addition to the various connectors, a column locator
diagram for a master or stand-alone unit is provided on the
rear panel.
CARD SLOTS — The Model 707A accepts up to six plug-
in matrix cards (8 rows by 12 columns) per mainframe.
MASTER/SLAVE OUT — An 8-pin DIN connector for
connecting a cable to the next mainframe in a master/slave
daisy chain configuration.
MASTER/SLAVE IN — An 8-pin DIN connector for con-
necting a cable from the previous mainframe in a master/
slave daisy chain configuration.
EXTERNAL TRIGGER INPUT — A BNC jack for
applying a trigger pulse to change to the next relay setup, if
triggers are enabled and TRIG ON EXT is selected as the
source. Pulses must be TTL-compatible, negative-or
positive-going (selected by a menu item), with a duration
greater than 600nsec.
RELAY TEST — A 6-pin quick-disconnect terminal block
with logic ground and four logic inputs for testing crosspoint relay closures. W iring between this terminal block and
rows A and B of an y card in the group of cards to be tested is
necessary for the test.
DIGIT AL I/O — A DB-25 connector for the TTL-compati-
ble digital I/O with data lines for eight inputs and eight outputs. It also contains control lines for handshaking (Input
Latch and Output Strobe). Input lines are viewed and output
lines are programmed through a menu item.
IEEE-488 INTERFACE — This connector interfaces the
Model 707A to the IEEE-488 bus. IEEE interface function
codes are marked adjacent to the connector.
AC RECEPTACLE — Power is applied through the sup-
plied power cord to the 3-terminal AC receptacle.
LINE FUSE — The line fuse provides protection for the A C
power line input. The fuse rating must match the line voltage
setting.
F AN FILTER — The fan filter keeps dirt from being drawn
into the instrument by the internal cooling fan. The filter
should be kept clean to ensure proper instrument cooling.
MATRIX READY OUTPUT — A BNC jack providing a
TTL-compatible, high- or low-true level (selected by a menu
item). It goes false when relays are switched and goes true
after the sum of the relay setting time and the programmed
settling time.
3-6
Getting Started
Figure 3-3
Model 707A rear panel
3-7
Getting Started
3.4 Card connections
Each card designed for the Model 707A is configured as an
8-row by 12-column matrix. The rows are lengthened by
adding columns from other cards (of the same model number). Connections for row expansion are usually internal to
the mainframe, either through the analog backplane buses or
with user-installed jumpers, depending on the card model.
Rows can also be expanded across mainframe boundaries,
either in a master/slave or stand-alone/stand-alone configuration. In a master/slave configuration of up to five mainframes, the rows are extended to 360 columns maximum.
(Paragraph 3.5 describes master/slave expansion.)
Expansion of rows leads to a long, narrow matrix. If your
application requires few instruments and many DUTs, connect the instruments to rows (up to 8) and the DUTs to columns (up to 72 with 6 cards). This connection scheme is
optimum because the row-column path has only one crosspoint, as shown in Figure 3-4.
DUT
Source
Source
Measure
A
B
C
Selecting the row connections for instruments is important
with cards designed for multiple applications. Using the
Model 7072 as an example, the recommended connections
are as follows:
• Rows A and B (1ow current) — Picoammeters,
electrometers.
• Rows C through F (general purpose) — DMMs,
sources.
• Rows G and H (C-V characteristics) — C-V analyzers.
An alternate connection scheme of the long, narrow matrix
has all connections on the columns, both instruments and
DUTs. This is done when the series of tests requires a large
number of instruments and DUTs, with only a few signals for
each test. As seen in Figure 3-5, with two cards, two crosspoint relays must be closed to complete a path from columncolumn (a safety benefit when sourcing). Paths with multiple
crosspoints have additional path resistance and contact
potential than single crosspoint paths.
Crosspoint programming becomes more complex with
column-column paths because of the number of possible
paths for large matrices and the choice of rows to complete
the path. (See Table 3-1.)
Measure
123456789101112
Note : One cr os s point closur e y ields a r ow- c olum n path.
Figure 3-4
Connecting instruments to rows
D
E
The row completion choice for column-column paths on
multiple application cards follows the recommendations
F
G
H
given previously for row-column paths. That is, with a
Model 7072 card, close a crosspoint relay in row A or B for
low current applications, row C, D, E, or F for general purpose switching, and row F or G for C-V switching.
3-8
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