Keithley 7038 User manual

The test & measurement
equipment you need at
the price you want.
Alltest carries the world’s largest selection of
used/refurbished benchtop test & measurement
equipment at 50% the price of new.
O
Our equipment is guaranteed working, warrantied, and
available with certified calibration from our in-house staff
of technicians and engineers.
• 10+ full time technicians with over 150 years of
specialization
• 90 day warranty & 5 day right of return on all
equipment
•
• 1-3 year warranties for new and
premium-refurbished equipment
• Every unit tested to OEM specifications
• Satisfaction guaranteed
You have plans, we will help you achieve them.
Any project. Any budget.
Get a quote today!
CCall (732) 919-3339 or email sales@alltest.net.
t
Alltest Instruments, Inc.
500 Central Ave.
Farmingdale, NJ 07727
P: (732) 919-3339
F: (732) 919-3332
alltest.net
s
sales@alltest.net

WARRANTY
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 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 origi-
nal warranty period, or at least 90 days.
LIMITATION OF WARRANTY
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, INDI-
RECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGESARISING 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 • 44-118-9575666 • Fax: 44-118-9596469
ITALY: Keithley Instruments SRL
• Viale S. Gimignano 38 • 20146 Milano • 39-2-48303008 • Fax: 39-2-48302274
NETHERLANDS: Keithley Instruments BV
• Avelingen West 49 • 4202 MS Gorinchem • 31-(0)183-635333 • Fax: 31-(0)183-630821
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 • 886-3-572-9077 • Fax: 886-3-572-9031

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 Revi-
sions, contain important change information that the user should incorporate immediately into the manual. Addenda are num-
bered 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.
RevisionA (Document Number (7038-901-01)...................................................................................... June 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 in-
struments and accessories would normally be used with non-haz-
ardous voltages, there are situations where hazardous conditions
may be present.
This product is intended for use by qualified personnel who recog-
nize shock hazards and are familiar with the safety precautions re-
quired 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 instru-
ment. They must be protected from electric shock and contact with
hazardous live circuits.
Maintenancepersonnel
perform routine procedures on the product
to keep it operating, for example, setting the line voltage or replac-
ing consumable materials. Maintenance procedures are described in
the manual. The procedures explicitly state if the operator may per-
form 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 ser-
vice 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 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,
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 instru-
ments’ 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 con-
necting sources to switching cards, install protective devices to lim-
it fault current and voltage to the card.
Before operating an instrument, make sure the line cord is connect-
ed 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 jump-
ers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.
Do not touch any object that could provide a 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 ac-
cessories, as defined in the specifications and operating informa-
tion, 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 ap-
plied 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 re-
fer to the operating instructions located in the manual.
The symbol on an instrument shows that it can source or mea-
sure 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.Always 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 Instru-
ments. 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 se-
lected 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.
!

Specifications
CHARACTERISTIC IMPEDANCE: 75Ωnominal.
MULTIPLEXERS PER CARD: Three (with isolated ground).
CHANNELS PER MULTIPLEXER: Four.
CONTACT CONFIGURATION: 1-pole, 1 of 4 tree. Channels 1, 5 and 9
normally closed.
RELAY DRIVE CURRENT: 154mA per channel.
CONNECTOR TYPE: 75Ωminiature SMB receptacle.
ACTUATION TIME: 6ms.
MAXIMUM VOLTAGE: Any terminal (center or shield) to any other
terminal or chassis: 24V.
MAXIMUM CURRENT: 10mA DC.
MAXIMUM POWER: 10W @ 1.2GHz.
ISOLATION: Multiplexer to Multiplexer: >1GΩ.
Center to Shield: >1GΩ, 60pF.
Channel to Channel: >100MΩ.
SIGNAL DELAY: <1ns.
CONTACT POTENTIAL: 15µV.
CONTACT RESISTANCE: <1Ω.
CONTACT LIFE:
3×10
5
closures @ 24VDC, 10mA DC;
1×10
5
closures @ 10W, 1.2GHz signal;
5×10
6
closures @ cold switching.
AC PERFORMANCE: ≤10 ≤100 ≤500 ≤900 ≤2
For Z
L
= Z
S
= 75ΩMHz MHz MHz MHz GHz
Insertion Loss (dB) <0.25 <0.5 <1.0 <1.5 <3.0
Crosstalk (dB)
Channel-Channel <–90 <–80 <–65 <–55 <–40
Mux. to Mux. <–90 <–80 <–70 <–60 <–55
VSWR <1.2 <1.25 <1.5 <1.5 <2.2
ENVIRONMENT: Operating: 0° to 50°C, up to 35°C at <80% RH.
Storage: –25°C to 65°C.
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.
ACCESSORIES SUPPLIED: Bank interconnection cables.
IN1
IN2
IN3
IN4
OUTA
IN5
IN6
IN7
IN8
OUTB
IN9
IN10
IN11
IN12
OUTC
HI
LO
(Signal
Common)
Mini SMB Connector
Configuration
7038 75Ω2.0GHz Multiplexer

i
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 ...................................................................................................................................1-1
1.6 Specifications ......................................................................................................................................................1-1
1.7 Unpacking and inspection ...................................................................................................................................1-2
1.7.1 Inspection for damage................................................................................................................................1-2
1.7.2 Handling precautions .................................................................................................................................1-2
1.7.3 Shipment contents......................................................................................................................................1-2
1.8 Instruction manual................................................................................................................................................1-2
1.9 Repacking for shipment .......................................................................................................................................1-2
1.10 Recommended cables and connectors..................................................................................................................1-2
2 Connections and Installation
2.1 Introduction .........................................................................................................................................................2-1
2.2 Handling precautions ...........................................................................................................................................2-1
2.3 Connections..........................................................................................................................................................2-1
2.3.1 Simplified schematic..................................................................................................................................2-1
2.3.2 Card configuration .....................................................................................................................................2-1
2.3.3 Input/output connecting cables ..................................................................................................................2-3
2.3.4 Typical connecting scheme........................................................................................................................2-3
2.4 Card installation and removal ..............................................................................................................................2-4
2.4.1 Card installation.........................................................................................................................................2-4
2.4.2 Card removal..............................................................................................................................................2-5
3 Operation
3.1 Introduction .........................................................................................................................................................3-1
3.2 Signal limitations .................................................................................................................................................3-1
3.3 Front panel control...............................................................................................................................................3-1
3.3.1 Closing and opening channels....................................................................................................................3-1
3.3.2 Scanning channels......................................................................................................................................3-2
3.4 IEEE-488 bus control...........................................................................................................................................3-2
3.4.1 Closing and opening channels....................................................................................................................3-2
3.4.2 Scanning channels......................................................................................................................................3-2
3.5 Switching considerations .....................................................................................................................................3-3
3.5.1 Card characteristics....................................................................................................................................3-3
3.5.2 Cable characteristics ..................................................................................................................................3-3
3.6 Multiplexer expansion..........................................................................................................................................3-4
3.6.1 Double T configuration..............................................................................................................................3-4
3.6.2 Matrix expansion........................................................................................................................................3-4
3.6.3 1
×
8 mux configuration.............................................................................................................................3-5
Table of Contents

ii
4 Servicing
4.1 Introduction ......................................................................................................................................................... 4-1
4.2 Handling and cleaning precautions...................................................................................................................... 4-1
4.2.1 Handling precautions................................................................................................................................. 4-1
4.2.2 Soldering considerations............................................................................................................................ 4-1
4.3 Performance verification ..................................................................................................................................... 4-1
4.3.1 Environmental conditions.......................................................................................................................... 4-1
4.3.2 Recommended verification equipment...................................................................................................... 4-2
4.3.3 Insertion loss tests...................................................................................................................................... 4-2
4.3.4 Isolation resistance tests ............................................................................................................................ 4-2
4.3.5 Channel isolation tests............................................................................................................................... 4-2
4.3.6 Special handling of static-sensitive devices .............................................................................................. 4-7
4.4 Principles of operation......................................................................................................................................... 4-7
4.4.1 Block diagram............................................................................................................................................ 4-7
4.4.2 Relay control.............................................................................................................................................. 4-7
4.4.3 Switching circuits ...................................................................................................................................... 4-8
4.4.4 Card configuration memory....................................................................................................................... 4-8
4.5 Troubleshooting................................................................................................................................................... 4-8
4.5.1 Troubleshooting equipment....................................................................................................................... 4-8
4.5.2 Troubleshooting procedure........................................................................................................................ 4-8
5 Replaceable Parts
5.1 Introduction ......................................................................................................................................................... 5-1
5.2 Parts list ............................................................................................................................................................... 5-1
5.3 Ordering information........................................................................................................................................... 5-1
5.4 Factory service..................................................................................................................................................... 5-1
5.5 Component layout and schematic diagram.......................................................................................................... 5-1

iii
2 Connections and Installation
Figure 2-1 Model 7038 simplified schematic................................................................................................................2-2
Figure 2-2 Model 7038 card configuration....................................................................................................................2-2
Figure 2-3 Typical connection scheme..........................................................................................................................2-3
Figure 2-4 Card installation in Model 7001...................................................................................................................2-4
Figure 2-5 Card installation in Model 7002...................................................................................................................2-4
3 Operation
Figure 3-1 “T” connector multiplexer expansion..........................................................................................................3-4
Figure 3-2 4
×
4 matrix/multiplexer connections ..........................................................................................................3-4
Figure 3-3 1
×
8 multiplexer configuration....................................................................................................................3-5
4 Servicing
Figure 4-1 Connections for insertion loss tests..............................................................................................................4-3
Figure 4-2 Connections for channel isolation tests........................................................................................................4-4
Figure 4-3 Connections for center-to-shield isolation tests...........................................................................................4-5
Figure 4-4 Connections for multiplexer-to-multiplexer isolation tests..........................................................................4-6
Figure 4-5 Block diagram..............................................................................................................................................4-7
List of Illustrations

v
4 Servicing
Table 4-1 Recommended verification equipment ........................................................................................................4-2
Table 4-2 Insertion loss values.....................................................................................................................................4-2
Table 4-3 Recommended troubleshooting equipment..................................................................................................4-8
Table 4-4 Troubleshooting procedure ..........................................................................................................................4-8
5 Replaceable Parts
Table 5-1 Model 7038 parts list....................................................................................................................................5-2
List of Tables

1
General Information
1-1
1.1 Introduction
This section contains general information about the Model
7038 75
Ω
2GHz Multiplexer Card. The Model 7038 is
equipped with three four-channel multiplexers and is de-
signed for both Model 7001 and 7002 Switch Systems.
1.2 Features
Key Model 7038 features include:
• Three independent four-channel multiplexers.
•75
Ω
characteristic impedance.
• 2GHz bandwidth.
• Low insertion loss (<1dB @ 500MHz; <1.5dB @
900MHz; <3dB @ 2GHz).
• LowVSWR assures good high-frequency performance.
1.3 Warranty information
Warranty information is located on the inside front cover of
this instruction manual. Should your Model 7038 require
warranty service, contact the Keithley representative or au-
thorized repair facility in your area for further information.
When returning the card for repair, be sure to fill out and in-
clude the service form at the back of this manual in order to
provide the repair facility with the necessary information.
1.4 Manual addenda
Any improvements or changes concerning the card or manu-
al will be explained in an addendum included with the card.
1.5 Safety symbols and terms
The following symbols and terms may be found on an instru-
ment or used in this manual.
The symbol on equipment indicates that you should re-
fer to the operating instructions located in the instruction
manual.
The
WARNING
heading used in this manual explains dan-
gers that might result in personal injury or death. Always
read the associated information very carefully before per-
forming the indicated procedure.
The
CAUTION
heading used in this manual explains haz-
ards that could damage the multiplexer card. Such damage
may invalidate the warranty.
1.6 Specifications
Model 7038 specifications are located at the front of this
manual.
!

General Information
1-2
1.7 Unpacking and inspection
1.7.1 Inspection for damage
The Model 7038 is packaged in a re-sealable, anti-static bag
to protect it from damage due to static discharge and from
contamination that could degrade its performance. Before re-
moving the card from the bag, observe the precautions on
handling discussed below.
1.7.2 Handling precautions
• Always grasp the card by the side edges and covers. Do
not touch the board surfaces or components.
• After removing the card from its anti-static bag, inspect
it for any obvious signs of physical damage. Report any
such damage to the shipping agent immediately.
• When the card is not installed in a switching main-
frame, keep the card in its anti-static bag, and store it in
the original packing carton.
1.7.3 Shipment contents
The following items are included with every Model 7038
order:
• Model 7038 75
Ω
2GHz Multiplexer Card
• Model 7038 Instruction Manual
• Additional accessories as ordered
• 2 SMB 10” jumpers (CA-193-1A)
1.8 Instruction manual
If an additional Model 7038 Instruction Manual is required,
order the manual package, Keithley part number 7038-901-
00. The manual package includes an instruction manual and
any pertinent addenda.
1.9 Repacking for shipment
Should it become necessary to return the Model 7038 for re-
pair, 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
Return Material Authorization (RMA) number.
• Advise as to the warranty status of the card.
• 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.
1.10 Recommended cables and connectors
Recommended Cable:
RG-179, 75
Ω
characteristic
impedance
Connector Type:
miniature SMB
When choosing cables, consider key parameters such as
maximum outside diameter, attenuation over the desired fre-
quency range, flexibility, and shield type. See
Switching con-
siderations
in
Section 3
for more information on cable
parameters and how they affect performance.

2
Connections and Installation
2-1
2.1 Introduction
WARNING
The procedures in this section are in-
tended only for qualified service person-
nel. Do not perform these procedures
unless you are qualified to do so. Failure
to recognize and observe normal safety
precautions could result in personal in-
jury or death.
This section includes information on making connections to
the Model 7038 and installing the card in the Model 7001/
7002 Switch System.
2.2 Handling precautions
To maintain high-impedance isolation between channels,
care should be taken when handling the card to avoid con-
tamination from such foreign materials as body oils. Such
contamination can reduce isolation resistance. To avoid pos-
sible contamination:
• Always grasp the card by the side edges or covers.
• Do not touch board surfaces, components, or connector
insulators.
• Operate the card in a clean environment. If the card be-
comes contaminated, it should be thoroughly cleaned as
explained in
Section 4
.
2.3 Connections
This paragraph provides the information necessary to con-
nect cables and your external test circuitry to Model 7038.
2.3.1 Simplified schematic
Figure 2-1 shows a simplified schematic diagram of the
Model 7038. The card is arranged into three separate multi-
plexers, each with four channels. Note that channels 1, 5, and
9 are normally closed.
2.3.2 Card configuration
Figure 2-2 shows the general configuration of the Model
7038. Connectors include:
IN 1-12 (channels 1-12):
Each input is equipped with a min-
iature SMB coaxial connector. The center conductor is the
signal path, while the outer shell is connected to signal com-
mon.
OUT A, OUT B, and OUT C:
Each multiplexer output is
equipped with a miniature SMB coaxial connector. The cen-
ter conductor is the signal path, and the shell is connected to
signal common.

Connections and Installation
2-2
Figure 2-1
Model 7038 simplified schematic
Figure 2-2
Model 7038 card configuration
Mini SMB
Connector Configuration
HI
LO
(Signal
Common) IN1
IN2
IN3
IN4
OUTA
Multiplexer A
IN5
IN6
IN7
IN8
OUTB
Multiplexer B
IN9
IN10
IN11
IN12
OUTC
Multiplexer C
Multiplexer C
Output Multiplexer C
Inputs
Multiplexer B
Output Multiplexer B
Inputs
Multiplexer A
Output Multiplexer A
Inputs

Connections and Installation
2-3
2.3.3 Input/output connecting cables
All connections to the multiplexer card input and output
jacks should be made using RG-179 75
Ω
coaxial cable
equipped with miniature SMB connectors.
WARNING
Make sure that power is off and external
energy sources are discharged before
connecting or disconnecting cables.
NOTE
75
Ω
cables must be used to assure good
high-frequency performance. See
Switching considerations
in
Section 3
for
more information.
2.3.4 Typical connecting scheme
Figure 2-3 shows a typical connecting scheme for the Model
7038. In this arrangement, sources are connected to the mul-
tiplexer A inputs while the measuring instrument is connect-
ed to the output.
CAUTION
Maximum voltage from any terminal
(center conductor or shield) to any other
terminal or chassis is 24V. Exceeding
this value may result in card damage.
IN1
IN2
IN3
IN4
OUTA
IN5
IN6
IN7
IN8
OUTB
IN9
IN10
IN11
IN12
OUTC
Note: All cables are 75Ω
RG-179 recommended
Measuring Instrument
Figure 2-3
Typical connection scheme

Connections and Installation
2-4
2.4 Card installation and removal
This paragraph explains how to install and remove the Model
7038 card assembly from the Model 7001/7002 mainframe.
WARNING
Installation or removal of the Model
7038 should be performed only by qual-
ified service personnel. Failure to recog-
nize and observe standard safety
precautions could result in personal in-
jury or death.
NOTE
To prevent performance degradation
caused by contamination, handle the card
only by the edges and covers.
2.4.1 Card installation
After connecting the input/output cables, perform the fol-
lowing steps, and refer to Figure 2-4 or Figure 2-5 to install
the card assembly in the Model 7001 or 7002 mainframe.
WARNING
Turn off power to all instrumentation
(including the Model 7001/7002), and
disconnect all line cords. Make sure all
power is removed and any stored energy
in external circuitry is discharged.
1. Open the ejector arms at the back edge of the card.
2. Slide the card edges into the guide rails inside the main-
frame.
3. Carefully push the card all the way forward until the
ejector arms engage the mounting cups.
4. Push in on the card edge and ejector arms until the card
is properly seated.
5. Make sure the ejector arms are properly latched.
Figure 2-4
Card installation in Model 7001
Figure 2-5
Card installation in Model 7002
Unlock card
Lock card
Ejector Arms (2)
Ejector Arms
(locked position)
CARD
1
CARD
2
CARD
3
CARD
4
INTERCONNECTION, INSTALLATION AND REMOVAL OF CARDS BY QUALIFIED SERVICE PERSONNEL ONLY.
WARNING:
NO INTERNAL OPERATOR SERVICEABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.
WARNING:

Connections and Installation
2-5
2.4.2 Card removal
Follow the steps below to remove the multiplexer card from
the mainframe:
WARNING
Turn off power to all instrumentation
(including the Model 7001/7002), and
disconnect all line cords. Make sure all
power is removed and any stored energy
in external circuitry is discharged.
1. Pull out on the ejector arms until the card pulls free from
the internal connector.
2. Carefully slide the card out of the switching mainframe.

3
Operation
3-1
3.1 Introduction
This section contains basic information on using the Model
7038 including signal limitations, switching considerations,
and multiplexer expansion. For detailed mainframe operat-
ing information, refer to the Model 7001 or Model 7002 In-
struction Manual.
3.2 Signal limitations
CAUTION
To prevent damage to the Model 7038,
do not exceed the maximum signal level
specifications of the card.
To prevent over-heating or damage to the relays, never ex-
ceed the following maximum signal levels when using the
Model 7038:
•
Maximum voltage:
Any terminal (center or shield) to
any other terminal or chassis: 24V.
•
Maximum current:
10mA DC
•
Maximum power:
10W @ 1.2GHz
3.3 Front panel control
3.3.1 Closing and opening channels
Model 7038 channels are organized into three multiplexer
banks as follows:
Multiplexer bank A: channels 1 to 4
Multiplexer bank B: channels 5 to 8
Multiplexer bank C: channels 9 through 12
NOTE
On power-up, the Model 7001 display will
not show that channels 1, 5, and 9 are nor-
mally closed. If the instrument is to be op-
erated manually, close channels 1, 5, and
9 so that the Model 7001 display reflects
the actual state of the Model 7038. Execut-
ing a scan list will also ensure that the dis-
play reflects the actual state of the relays.
Closing channels
To close a Model 7038 multiplexer channel, simply key in
the CHANNEL assignment, then press the Model 7001/7002
CLOSE key. For example, to close channel 11 of a Model
7038 installed in slot 2, key in the following channel list, and
press CLOSE:
SELECT CHANNELS 2!11
You can also simultaneously close one channel in each mul-
tiplexer by including all channels in the channel list. For ex-
ample, to close channels 2, 6, and 10 of a card in slot 1, enter
the following channel list at the prompt:
SELECT CHANNELS 1!2, 1!6, 1!10
(Note that channels are separated by a comma, which can be
inserted by pressing either the ENTER or right cursor key.)
Table of contents
Other Keithley Computer Hardware manuals

Keithley
Keithley PDISO-8 User manual

Keithley
Keithley 7020-D User manual

Keithley
Keithley KM-488-DD User manual

Keithley
Keithley 7063 User manual

Keithley
Keithley IE-488 User manual

Keithley
Keithley 7075 User manual

Keithley
Keithley KM-488-ROM User manual

Keithley
Keithley DAS-1700 Series User manual

Keithley
Keithley DAS-1800ST Series User manual

Keithley
Keithley PIO-24 User manual