Tektronix 7070 Instruction Manual
Model 7070Universal Adapter Card
Instruction Manual
A GREATER MEASURE OF CONFIDENCE
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 representative, or contact Keithley headquarters in Cle veland, 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
BELGIUM: Keithley Instruments B.V.
CHINA: Keithley Instruments China Y uan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-62022886 • F ax: 8610-62022892
FRANCE: Keithley Instruments Sarl 3, allée des Garays • 91127 Palaiseau Cedex • 01-64 53 20 20 • Fax: 01-60 11 77 26
GERMANY: Keithley Instruments GmbH Landsberger Strasse 65 • 82110 Germering • 089/84 93 07-40 • Fax: 089/84 93 07-34
GREAT BRITAIN: Keithley Instruments Ltd
INDIA: Keithley Instruments GmbH Flat 2B, WILOCRISSA • 14, Rest House Crescent • Bangalore 560 001 • 91-80-509-1320/21 • Fax: 91-80-509-1322
ITALY: Keithley Instruments s.r.l. Viale S. Gimignano, 38 • 20146 Milano • 02-48 39 16 01 • Fax: 02-48 30 22 74
NETHERLANDS: Keithley Instruments B.V. Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: 0183-630821
SWITZERLAND: Keithley Instruments SA Kriesbachstrasse 4 • 8600 Dübendorf • 01-821 94 44 • Fax: 01-820 30 81
TAIWAN: Keithley Instruments Taiwan 1 Fl. 85 Po Ai Street • Hsinchu, Taiwan, R.O.C. • 886-3572-9077 • Fax: 886-3572-903
Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02/363 00 40 • Fax: 02/363 00 64
The Minster • 58 Portman Road • Reading, Berkshire RG30 1EA • 0118-9 57 56 66 • Fax: 0118-9 59 64 69
9/00
Model 7070
Universal Adapter Card
Instruction Manual
©1988, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Second Printing, October 2000
Document Number: 7070-901-01 Rev. B
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 7070-901-01) ............................................................ 1988
Addendum A (Document Number 7070-901-02)................................................ April 1988
Addendum A (Document Number 7070-901-03)........................................ December 1988
Revision B (Document Number 7070-901-01) ..............................................October 2000
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, for ensuring that the equipment is
operated within its specifications and operating limits, 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.
Keithley products are designed for use with electrical signals that
are rated Installation Category I and Installation Category II, as described in the International Electrotechnical Commission (IEC)
Standard IEC 60664. Most measurement, control, and data I/O signals are Installation Category I and must not be directly connected
to mains voltage or to voltage sources with high transient over -voltages. Installation Category II connections require protection for
high transient over-voltages often associated with local AC mains
connections. The user should assume all measurement, control, and
data I/O connections are for connection to Category I sources unless otherwise marked or described in the Manual.
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.
that hazardous voltage is present in any unknown circuit before
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,
exposed.
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.
When installing equipment where access to the main power cord is
restricted, such as rack mounting, a separate main input power disconnect device must be provided, in close proximity to the equipment and within easy reach of the operator.
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.
A good safety practice is to expect
no conductive part of the circuit may be
The instrument and accessories must be used in accordance with its
specifications and operating instructions or the safety of the equipment may be impaired.
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.
The
CAUTION heading in a manual explains hazards that could
damage the instrument. Such damage may invalidate the warranty.
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 an 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. Products that consist of a circuit board with no
case or chassis (e.g., data acquisition board for installation into a
computer) should never require cleaning if handled according to instructions. If the board becomes contaminated and operation is affected, the board should be returned to the factory for proper
cleaning/servicing.
2/01
SAFETY PRECAUTIONS
The following safety precautions should be observed before using the Model 7070 and the associated
instruments.
This card is intended for USC by qualified personnel who recognize shock hazards and are familiar
with the safety precautions required to avoid possible injury. Read over this manual carefully before
using the adapter card.
Exercise extreme caution when a shock hazard is present at the test circuit. User-supplied lethal voltages
may be present on the card or the card connector jacks. The American National Standards Institute
(ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS or 42.4V peak are
present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit
before measuring.
Do not exceed ZOOV between any two pins or any pin and earth ground
Inspect the connecting cables and test leads for possible wear, cracks, or breaks before each use.
For maximum safety, do not touch the card, test cables or any instruments while power is applied
to the circuit under test. Turn off the power and discharge any capacitors before connecting or discon-
necting cables from the adapter card.
Do not touch any object which 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 input signal levels of the adapter card, as defined in the specifications
and operation section of this manual.
Observe IEC-348 recommended voltage spacing with high-voltage circuits (>2OOV) mounted on the
unplated prototyping area (see paragraph 2.5.10).
SPECIFICATIONS
DESCRIPTION: Backplane atender card for
707 matrix cards or breadboard card, jumper
selectable. Access to analog and digital backplanes, relay drivers, and power supplies.
MAXIM”M SIGNAL LEVEL m4CKPLANEh
2oov, IA.
SUPPLY SPECIFIC.KrIONS: 6”. 2.9A^ max-
imum; SV, 500mA maximum, digital supply.
*Assuming no other cards are installed. See
individual card specifications for their relay
drive requirements.
RELAY DRIVE LINES: 96 open collector sink
drivers, 140mA each. Coded in 8 row x 12
column format for front panel display. User
may provide external coil voltage supply up
to WI or use mainframe h” supply
BREADBOARD SPACE: Approximate,y
330mm x 228mm (13 in. x 9 in.).
RIBBON CABLE: Extends analog and digital
backplanes 10 feet for benchtop servicing
of cards.
CONNECWR TYPE: 20 quick disconnect with
3 screw termina,s. 2 strain relief clamps.
*CCESSORY SUPPLIED: instruction man”a,.
Contains information on Model 7070 features, specifications, and accessories.
SECTION 1
General Information
Details installation of the Model 7070 Universal Adapter
Card within the Model 707 Switching Matrix, covers
card signal paths, describes use as an extender card,
and presents information for mounting relays and other
components on the breadboard portion of the Model
7070.
Gives typical applications for the Model 7070.
Contains performance verification procedures, troubleshooting information and principles of operation for
the adapter card.
Lists replacement parts, and also includes component
layout and schematic drawings for the Model 7070.
SECTION 2
Operation
SECTION 3
Applications
SECTION 4
Service Information
SECTION 5
Replaceable Parts
Table of Contents
SECTION 1 —
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.6 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.7 UNPACKING AND INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.7.1 Inspect for Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.7.2 Shipment Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.7.3 Instruction Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.8 REPACKING FOR SHIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
SECTION 2 —
2.1 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 HANDLING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.3 CARD CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.3.1 Row/Column Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.3.2 SMB Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.3.3 Prototyping Areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.3.4 Analog Pathway Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.3.5 Ribbon Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.3.6 CARD FUNCTION Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.3.7 Relay Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.3.8 +V Relay and Digital Common Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.3.9 +5V and +6V Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.3.10 Chassis and GND Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.4 EXTENDER CARD OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.4.1 Selecting the Extend Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.4.2 Ribbon Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.4.3 Connecting Cards to the Extender Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.4.4 Card Installation and Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.4.5 Extender Card Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.5 PROTOTYPING CARD OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.5.1 Local Function Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.5.2 Breadboarding Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.5.3 Board Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.5.4 Power Supply Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.5.5 Internal/External Relay Powering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.5.6 Digital Common Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.5.7 Relay Coil Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.5.8 Relay Matrix Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.5.9 Relay Settling Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.5.10 High-Voltage Switching Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.5.11 Prototype Card Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
2.5.12 Switching Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
2.5.13 Internal Matrix Expansion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.5.14 External Matrix Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.6 MEASUREMENT CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.6.1 Magnetic Fields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
General Information
Operation
2.6.2 Radio Frequency Interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.6.3 Ground Loops. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.6.4 Keeping Connectors Clean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
2.6.5 Shielding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
2.6.6 Guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
SECTION 3 —
3.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 SCANNER SWITCHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2.1 Scanner ConÞguration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2.2 Relay Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2.3 Programming the Scanner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.2.4 A Practical Scanner Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.3 ON-CARD BUFFERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.3.1 Buffer ConÞguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.3.2 Buffer Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.3.3 Powering the Buffer ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.3.4 A Typical Buffer Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.4 SOLID-STATE RELAYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.4.1 Solid-state Relay Advantages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.4.2 Typical Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
3.4.3 Solid-state Relay Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3.4.4 Programming Solid-state Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3.5 HIGH-SPEED ANALOG SWITCHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3.5.1 Analog Multiplexer ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3.5.2 Typical Analog Switching Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3.5.3 Control Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3.6 USING THE ADAPTER CARD WITH OTHER MATRIX CARDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
3.6.1 Scanner-Matrix Combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
3.6.2 Signal Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Applications
SECTION 4 —
4.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2 HANDLING AND CLEANING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.3 SPECIAL HANDLING OF STATIC-SENSITIVE DEVICES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.3.1 Rear Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.4 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.4.1 Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.4.2 Troubleshooting Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.5 PRINCIPLES OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.5.1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.5.2 ID Data Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.5.3 Relay Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.5.4 Power-on Safeguard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
SECTION 5 —
5.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2 PARTS LISTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.3 ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.4 FACTORY SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.5 COMPONENT LAYOUT AND SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Service Information
Replaceable Parts
List of Illustrations
SECTION 2 —
Figure 2-1 Card ConÞguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Figure 2-2 Extend Function Jumper Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Figure 2-3 Ribbon Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Figure 2-4 Extender Board Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Figure 2-5 Model 7070 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Figure 2-6 LOCAL Function Jumper Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Figure 2-7 Jumper Installation for Internal Relay Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Figure 2-8 External Supply Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Figure 2-9 Typical Relay Driver Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Figure 2-10 Typical Relay Coil Connections (Row A Shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Figure 2-11 Relay Matrix Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Figure 2-12 Matrix Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Figure 2-13 Connecting Three Cards for 8
Figure 2-14 16
Figure 2-15 Power Line Ground Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
Figure 2-16 Eliminating Ground Loops. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
Figure 2-17 Shielding Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Figure 2-18 Guarded Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Figure 2-19 Typical Guarded Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
SECTION 3 —
Figure 3-1 A Scanner as a Rotary Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Figure 3-2 8-Input, 2-Pole Relay Scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Figure 3-3 Scanner Relay Coil Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Figure 3-4 Program 1 Flowchart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Figure 3-5 Testing Thick Film Resistor with a Scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Figure 3-6 Program 2 Flowchart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Figure 3-7 Buffer ConÞguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Figure 3-8 DC Converter Used to Power Buffer ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Figure 3-9 Typical High-Resistivity Test System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Figure 3-10 Voltages Necessary to Determine Resistivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Figure 3-11 Zero-crossing Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Figure 3-12 Typical DC Solid-state Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Figure 3-13 Typical AC Solid-state Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Figure 3-14 Typical Solid-state Relay Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Figure 3-15 Typical Multiplexer IC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Figure 3-16 High-Speed Analog Multiplexer with Control Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Figure 3-17 Program 3 Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-I7
Figure 3-18 Adding a Scanner to a Switching Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Figure 3-19 Signal Conditioning Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Operation
×
36 Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
×
36 Matrix Constructed by External Jumpering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Applications
SECTION 4 —
Figure 4-1 Removing the Rear Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Figure 4-2 ID Data Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Figure 4-3 Model 7070 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Service Information
List of Tables
SECTION 2 —
Table 2-1 Analog Pathway Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Table 2-2 Drive Current per Crosspoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Table 2-3 Partial List of Recommended Spacing for High-Voltage Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Table 2-4 Column Numbering by Slot and Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
SECTION 3 —
Table 3-1 Multiplexer IC Truth Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
SECTION 4 —
Table 4-1 Recommended Troubleshooting Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Table 4-2 Troubleshooting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Operation
Applications
Service Information
SECTION 1
General Information
•
1.1 INTRODUCTION
This section contains general information about the
Model 7070.
Section 1 is arranged in the following manner:
1.2 Features
1.3 Warranty Information
1.4 Manual Addenda
1.5 Safety Symbols and Terms
1.6 SpeciÞcations
1.7 Unpacking and Inspection
1.8 Repacking for Shipment
1.2 FEA TURES
The Model 7070 Universal Adapter Card provides two functions. As an extender card, the unit is designed for backplane extension using a 10-foot ribbon cable assembly. The
second function is as prototyping or breadboarding card,
allowing for user-installed relays or other circuits for custom matrix designs.
There are now two versions of the Model 7070. The standard
Model 7070 Universal Adapter Card includes ribbon cables
for extender card operation. All sections of this manual
apply to this version of the card. The Model 7070-PCA
Prototype Circuit Assembly is intended for use only as a
prototyping card and does not include extender cables.
Those with a Model 7070-PCA should disregard all
references in this manual to extender card operation. Major
sections that do not apply to the Model 7070-PCA include:
paragraph 2.4, Table 5-2, and the extender board component
layout and schematic located at the end of Section 5.
Other key features of the Model 7070 Universal Adapter
Card include:
•
Detachable 10-foot ribbon cable assembly for extender
card operation.
•
Prototyping area consisting of a grid of holes on 0.1 in.
centers for relay and component mounting.
•
96 relay drivers, each with 140mA current sink capability.
•
On-card decoding circuity to allow mainframe front
panel and IEEE-488 control of user-installed relays and
circuits.
Plated-through holes and pads for easy access to backplane pathways and relay drivers.
•
Screw-terminal connections using quick-disconnect connectors for row and column connections.
•
8
×
12 (eight row by 12 column) matrix implementation
with user-supplied relays or circuity.
•
Guarding pathways are maintained on the card.
1.3 W ARRANTY INFORMA TION
Warranty information is located on the inside front cover of
this instruction manual. Should your Model 7070 require
warranty service, contact the Keithley representative or
authorized repair facility in your area for further
information. When returning the card for repair, be sure to
Þll out and include the service form at the back of this
manual in order to provide the repair facility with the
necessary information.
1.4 MANUAL ADDEND A
Any improvements or changes concerning the adapter card
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.
1.5 SAFETY SYMBOLS AND TERMS
The following symbols and terms may be found on an
instrument or used in this manual.
!
The symbol on an instrument indicates that the user
should refer to the operating instructions located in the
instruction manual.
The symbol on an instrument shows that high voltage
may be present on the terminal(s). Use standard safety precautions to avoid personal contact with these voltages.
The
WARNING
gers that might result in personal injury or death. Always
read the associated information very carefully before performing the indicated procedure.
heading used in this manual explains dan-
1-1
GENERAL INFORMATION
The
CAUTION
ards that could damage the adapter card. Such damage may
invalidate the warranty.
heading used in this manual explains haz-
•
Ribbon cable clips (5).
•
Model 7070 Instruction Manual.
•
Additional Accessories as ordered.
1.6 SPECIFICA TIONS
Model 7070 speciÞcations may be found at the front of this
manual. These speciÞcations are exclusive of the matrix
mainframe speciÞcations, which are located in the
Model 707 Instruction Manual.
1.7 UNP A CKING AND INSPECTION
1.7.1 Inspection for Damage
Upon receiving the Model 7070, carefully unpack it from its
shipping carton and inspect the card for any obvious signs
of physical damage. Report any such 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 7070
order:
•
Model 7070 Universal Adapter Card.
•
Ribbon cable/extender board assembly.
1.7.3 Instruction Manual
The Model 7070 Instruction Manual is three-hole drilled so
that it can be added to the three-ring binder of the
Model 707 Switching Matrix Instruction Manual. After
removing the plastic wrapping, place the manual in the
binder after the mainframe instruction manual. Note that a
manual identiÞcation tab is included and should precede
the adapter card instruction manual.
If an additional instruction manual is required, order the
manual package, Keithley part number 7070-901-00. The
manual package includes an instruction manual and any
pertinent addenda.
1.8 REP A CKING FOR SHIPMENT
Should it become necessary to return the Model 7070 for
repair, carefully pack the unit in its original packing carton
or the equivalent, and include the following information:
•
Advise as to the warranty status of the adapter card.
•
Write ATTENTION REPAIR DEPARTMENT on the shipping label.
•
Fill out and include the service form located at the back of
this manual.
1-2
SECTION 2
Operation
2.1 INTRODUCTION
This section contains information on card and matrix configuration, extender and prototyping functions, as well as
measurement considerations, and is arranged as follows:
2.2 Handling Precautions:
should be taken into account when handling the card
to avoid contamination that could degrade
performance.
2.3 Card Configuration: Covers the various
and pads on the card.
2.4 Extender Card Operation:
7070 as an extender card for such applications as
troubleshooting other matrix cards.
2.5 Prototype Card Operation:
relays and other circuits to construct a custom matrix
card.
2.6 Measurement Considerations: Covers some important
aspects to keep in mind when using the Model 7070.
Discusses precautions that
connectors
Details using the Model
Discusses
breadboarding
foreign materials as body oils. Such contamination can
substantially lower leakage resistances, degrading performance. To avoid any possible contamination, always grasp
the card by the handle or the card edges. Do not touch
board surfaces, edge connectors, or components after
prototyping and cleaning.
Dirt build-up over a period of time is another possible
source of contamination. To avoid this problem, operate
the mainframe and adapter card only in a clean environment.
Contamination from solder flux can also degrade performance. After soldering wires to the card, carefully clean
it using the procedure discussed in paragraph 2.6.3.
2.3 CARD CONFIGURATION
The overall configuration of the Model 7070 is shown in
Figure 2-l. The following paragraphs discuss the main
aspects of the card.
2.2 HANDLING PRECAUTIONS
To maintain isolation, care should be taken when handling the adapter card to avoid contamination from such
WARNING
User-supplied lethal voltages may be present on
the PC board or connectors.
2-112-Z
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OPERATION
2.3.1 Row/Column Connectors
A 3-terminal removable connector block is available for
each row and column connection of the switching matrix.
These blocks are labelled rows A through H, and columns
1 through 12. The three terminals available are H (HI), L
(Lo), and G (guard). The connectors are equipped with
screw terminals, and they accept wires as large as #16AWG.
Plated through holes with pads adjacent to the connectors allow input/output connections to circuits and relays
mounted on the protoptyping areas.
2.3.2 SMB Connectors
The four SMB connectors are intended for expanding the
matrix of rows A, B, G, and H to a Model 7072 Semicon-
ductor Matrix Card. These jumpers are supplied with the
Model 7072, and they can be installed as discussed in the
Model 7072 Instruction Manual.
2.3.3 Prototyping Areas
There are two prototyping areas located on the card. The
larger of the two is approximately 9in. x 9in. and has
plated-through hole pairs (0.04in. in diameter) on O.lin.
centers. The unplated area is about 4.5in x 8in. and is intended for such applications as switching higher voltages
than ZOOV using suitable relays and wiring. Again, the
holes are 0.04in. in diameter and are located on O.lin.
centers.
rows A through H of the Model 7073 expansion pathways.
Note that Model 7072 expansion of rows A, B, G, and H
is available through the SMB connectors.
Table 2-1. Analog Pathway Summary
2.3.5 Ribbon Cable Connections
The three ribbon cable connectors mate with the ribbon
cable headers when the Model 7070 is being used as an
extender card. In addition to the three analog pathways,
the digital circuits are extended through the ribbon cable
so that any card connected to the extender can function
normally.
2.3.6 CARD FUNCTION Jumper
The CARD FUNCTION jumper selects the operating mode
of the adapter card. In the EXTEND position, the Model
7070 is set up for extender card operation. In the LOCAL
position, relays or circuits on the card can be controlled
by the relay drivers.
WARNING
The maximum voltage between any two
backplane connections or between any
backplane connector and chassis ground is
200V. The maximum voltage between any two
pads in the plated area is 200V. IEC-346 recommended spacing must be maintained for highvoltage circuits mounted on the unplated prototyping area. See paragraph 2.6.10 for highvoltage conslderatlons.
2.3.4 Analog Pathway Connections
Three groups of pads are intended for matrix expansion
to other cards available for the matrix system: the Model
7071 General Purpose Matrix Card, the Model 7072
Semiconductor Matrix Card, and the Model 7073 Coaxial
Matrix Card. As summarized in Table 1, ANALOG #l accesses rows C through F of the Model 7072 expansion
pathways, ANALOG #2 accesses rows A through H of the
Model 707I expansion pathways, and ANALOG #3 access
2.3.7 Relay Drivers
There are 96 relay drivers located in 12 ICs on the circuit
boards. The connecting pads for the drivers are labelled
in row-column format. The output of each driver is active
IQ with a 14OmA sink capability. Note, however, that the
maximum number of relays that can be energized is liited
by the power available; see paragraph 2.5.4 for more information.
2.3.6 +V Relay and Digital Common Buses
The +V RELAY BUS is intended for connection of the
supply voltage to the on-card relays. If using the +6V
mainframe supply, a jumper must be connected between
the +V RELAY BUS and the +6V supply pad on the card.
If an external supply is used, it should be connected to
the +V RELAY BUS, and the +6V supply must be disconnected from +V RELAY BUS.
2-5
OPERATION
The DIGITAL COMMON BUS provides a common connection for on-card active circuits using the mainframe’s +5V
supply.
2.3.9 +5V and +6V Supplies
The +5V supply can be used to power user-installed digital
circuits mounted on the Model 7070 breadboard. Note that
the maximum +5V supply current for the card is 500mA.
The +6V supply can be used to power user-installed relays.
The maximum current available from the +6V supply 2.9A;
this value assumes that no other cards are installed in the
mainframe. See paragraph 2.5.4 for a detailed discussion of
power supply limitations.
2.3.10 Chassis and GND Connections
The two screw terminals adjacent to the input/output connectors are at chassis ground potential and can be used to
connect cable shields to chassis ground. An additional chassis ground pad is located on the lower rear corner of the
card. The GND pad located at the lower rear terminal is connected to digital common.
2.4 EXTENDER CARD OPERA TION
NOTE
If relays are mounted on the card, disconnect the
+V relay bus from the relay supply voltage before
using the Model 7070 as an extender card. Otherwise, any on-card relays will be energized when
accessing the card slot.
Card Function
Extend
Local
NOTE
This section does not apply to the Model 7070-PCA.
One of the two functions of the Model 7070 is used as an
extender card for troubleshooting or bench-top testing of
other matrix cards. The following paragraphs discuss setting up the unit as an extender card, connecting the ribbon
cables, and connecting other cards to the extender board.
2.4.1 Selecting the Extend Function
In order to use the Model 7070 as an extender card, the
CARD FUNCTION switch must be in the EXTEND position, as shown in Figure 2-2.
Figure 2-2. Extend Function Jumper Selection
2.4.2 Ribbon Cable Connections
Three 10-foot ribbon cables attached to an extender board
are supplied with the Model 7070. In order to use the
Model 7070 as an extender card, these cables must be connected to the on-card connectors, as shown in Figure 2-3.
The widest cable should be routed through the upper cable
clamp, while the two narrower cables should be routed
through the lower cable clamp (remove upper half of clamp
Þrst). After making connections, secure the ribbon cables
with the clamps. Also dress the cables with the supplied
cable clips where convenient.
2-6
OPERATION
Connect Ribbon
Cables to Cable
Connectors
Extender
Board
Route Two -/
Narrow Cables
Through Lower
Clamp
Model 7070
Figure 2-3. Ribbon Cable Connections
2.4.3 Connecting Cards to the Extender Card
To connect other cards to the Model 7070, simply plug in
the card in question to the extender board, as shown in
Figure 2-4. Make certain the card is properly seated in the
edge connectors.
WARNING
User-supplied lethal voltages may be present on
the extender board. Place the matrix card that
has been set outslde the mainframe on a nonconductive surface. Do not place the matrix
card on a conductive surface such as a rack.
Voltages present on the card could short, caus-
ing a shock hazard or posslble damage to the
matrlx card or mainframe.
CAUTION
Do not touch any card edge connectors to avoid
contamlnatlng them; such contamination may
degrade
card performance.
2.4.4 Card Installation and Removal
After prototyping or extender card selection, the Model
7070 should be installed within the Model 707 Switching
Matrix, as summarized below. Figure 2-5 shows the installation procedure.
WARNING
Turn off the mainframe power and disconnect
the line cord before installing or removing
matrix cards.
1. Before installing the card, make sure the access door on
top of the Model 707 is fully closed and secured. The
access door contains tracks for the card slots and must
be in place to properly install the card.
2. With one hand grasping the handle, and the other
holding the back of the card, line up the card with the
tracks in the desired slot. Make certain that the component side of the card is facing the fan on the mainframe.
2-7
OPERATION
707X Card
Extender
3
L-
gl
Seat Card
Properly in connectors
Board
To 7070
Main Board
Figure 2-4. Extender Board Connections
CAUTION
Do not touch the card surfaces or any components to avoid contamination that could
degrade card performance.
3. Slide the card into the mainframe until it is properly
seated in the edge connectors at the back of the slot.
Once the card is properly seated, secure it to the mainframe by finger tightening the spring-loaded screws.
WARNING
The mounting screws must be secured to ensure a proper chassis ground connectlon be-
tween the card and the mainframe. Failure to
properly secure this ground connection may
result in personal injury or death due to electric shock.
4. To remove a card, first turn off the power and disconnect the line cord from the mainframe. Disconnect all
external and internal cables (internal cables can be reached through the access door). Loosen the mounting
screws, then pull the card out of the mai&ame by the
handle. When the back of the card clears the mainframe,
support it by grasping the bottom edge near the rear
of the card.
2-8
OPERATION
CARD HANDLE
Figure 2-5. Model 7070 Installation
MOUNTING SCREWS
2-9
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