Tektronix 7017 Instruction Manual

Instruction Manual

Model 7017

800MHz Multiplexer Card

Contains Operating and Servicing Information

7017-901-01 Rev. A / 8-96

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 K eithley headquarters in Cleveland, Ohio. Y ou 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.

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, 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 • 216-248-0400 • Fax: [phone] • http://www.keithley.com

CHINA: Keithley Instruments China • Yuan Chen Xin Building, Room 705 • No. 12 Yumin Road, Dewei, Madian • Beijing, China 100029 • 8610-2022886 • Fax: [phone]
FRANCE: Keithley Instruments SARL • BP 60 • 3 allée des Garays • 91122 Palaiseau Cédex • 31-6-0115155 • Fax: [phone]
GERMANY: Keithley Instruments GmbH • Landsberger Straße 65 • 82110 Germering • 49-89-849307-0 • Fax: [phone]
GREAT BRITAIN: Keithley Instruments, Ltd. • The Minster • 58 Portman Road • Reading, Berkshire RG30 1EA • 44-01734-575666 • Fax: [phone]
ITALY: Keithley Instruments SRL • Viale S. Gimignano 38 • 20146 Milano • 39-2-48303008 • Fax: [phone]
JAPAN: Keithley Instruments Far East KK • Aibido Bldg. • 7-20-2 Nishishinjuku • Shinjuku-ku, Tokyo 160 • 81-3-5389-1964 • Fax: [phone]
NETHERLANDS: Keithley Instruments BV • Avelingen West 49 • 4202 MS Gorinchem • 31-(0)183-635333 • Fax: [phone]
SWITZERLAND: Keithley Instruments SA • Kriesbachstrasse 4 • 8600 Dübendorf • 41-1-8219444 • Fax: [phone]
TAIWAN: Keithley Instruments Taiwan • 1, Ming-Yu First Street • Hsinchu, Taiwan, R.O.C. • 886-35-778462 • Fax: [phone]

Model 7017 800MHz Multiplexer Card

Instruction Manual

©1996, Keithley Instruments, Inc.

Test Instrumentation Group

All rights reserved.

Cleveland, Ohio, U.S.A.

First Printing, August 1996

Document Number: 7017-901-01 Rev. A

Manual Print History

The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The Revision
Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are released between Revi­sions, contain important change information that the user should incorporate immediately into the manual. Addenda are num­bered sequentially. When a new Revision is created, all Addenda associated with the previous Revision of the manual are
incorporated into the new Revision of the manual. Each new Revision includes a revised copy of this print history page.

Revision A (Document Number 7017-901-01).....................................................................................August 1996

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.

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.

pect that hazardous voltage is present in any un­known circuit before measuring.

Before operating an instrument, make sure the line cord is connect­ed to a properly grounded power receptacle. Inspect the connecting
cables, test leads, and jumpers for possible wear, cracks, or breaks
before each use.

For maximum safety, do not touch the product, test cables, or any
other instruments while power is applied to the circuit under test.
ALWAYS remove power from the entire test system and discharge
any capacitors before: connecting or disconnecting cables or jump­ers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.

Do not touch any object that could provide a current path to the
common side of the circuit under test or power line (earth) ground.
Always make measurements with dry hands while standing on a
dry, insulated surface capable of withstanding the voltage being
measured.

A good safety practice is to ex-

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.

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 main. When con­necting sources to switching cards, install protective devices to lim­it fault current and voltage to the 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 #18
AWG or larger wire.

The symbol on an instrument or accessory indicates that 1000V
or more may be present on the terminals. Refer to the product man­ual for detailed operating information.

Instrumentation and accessories should not be connected to hu­mans.

Maintenance should be performed by qualified service personnel.
Before performing any maintenance, disconnect the line cord and
all test cables.

7017 • 800MHZ MULTIPLEXER SPECIFICATIONS

MULTIPLEXERS PER CARD: 2(with isolated ground).
CHARACTERISTIC IMPEDANCE: 50Ωnominal.
CHANNELS PER MULTIPLEXER: 4.
CONTACT CONFIGURATION: 1 pole Form A, common shield.
RELAY DRIVE CURRENT: 26mA per channel.
CONNECTOR TYPE: SMA.
RECOMMENDED CABLE: RG-223/U.
ACTUATION TIME: 1ms.
MAXIMUM VOLTAGE: 42V peak.
MAXIMUM CURRENT: 1A carry/0.5A switched.
MAXIMUM POWER: 10VA.
ISOLATION:

Multiplexer to Multiplexer: >109Ω.
Center to Shield: >109Ω, <60pF.
Channel to Channel: >109Ω.

CONTACT POTENTIAL: <25µV.
CONTACT RESISTANCE: <0.5Ωinitial, 1Ω at end of contact life.
CONTACT LIFE: 1V, 10mA: 108closures. 20V, 0.5A: 5×104closures.
AC PERFORMANCE:

For ZL= ZS= 50Ω

≤10 ≤100 ≤500 ≤800

MHz MHz MHz MHz
Insertion Loss (dB): <0.35 <1.0 <2.0 <3.0
Crosstalk (dB)

1

Channel-Channel <–60 <–40 <–35 <–30
Mux. to Mux. <–80 <–60 <–60 <–55

VSWR: <1.2 @ 100MHz.

1

Specification assumes 50Ω termination.

ENVIRONMENT:Operating: 0° to 50°C, up to 35°C at <80% R.H.

Storage: –25°C to 65°C.

Specifications are subject to change without notice.

7/3/96

IN 1

IN 2
Output A
IN 3

IN 4

IN 5

IN 6
Output B
IN 7

IN 8

Table of Contents

1 General Information

1.1 Introduction..........................................................................................................................................................1-1

1.2 Features................................................................................................................................................................1-1

1.3 Warranty information...........................................................................................................................................1-1

1.4 Manual addenda...................................................................................................................................................1-1

1.5 Safety symbols and terms ....................................................................................................................................1-1

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

1.7.4 Instruction manual......................................................................................................................................1-2

1.7.5 Repacking for shipment .............................................................................................................................1-2

1.8 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 ..............................................................................................................................2-3

2.4.1 Card installation.........................................................................................................................................2-4

2.4.2 Card removal..............................................................................................................................................2-4

i

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..................................................................................................................................... 3-2

3.5.1 Card characteristics.................................................................................................................................... 3-2

3.5.2 Cable characteristics.................................................................................................................................. 3-3

3.6 Applications......................................................................................................................................................... 3-3

3.6.1 Multiplexer expansion............................................................................................................................... 3-3

3.6.2 Filter testing............................................................................................................................................... 3-7

3.6.3 Tape head production testing..................................................................................................................... 3-7

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.......................................................................................................................... 4-2

4.3.2 Recommended verification equipment...................................................................................................... 4-2

4.3.3 Insertion loss tests...................................................................................................................................... 4-2

4.3.4 Isolation tests............................................................................................................................................. 4-4

4.4 Special handling of static-sensitive devices ........................................................................................................ 4-8

4.5 Principles of operation......................................................................................................................................... 4-8

4.5.1 Block diagram............................................................................................................................................ 4-8

4.5.2 Relay control.............................................................................................................................................. 4-9

4.5.3 Switching circuits ...................................................................................................................................... 4-9

4.5.4 Card configuration memory....................................................................................................................... 4-9

4.6 Troubleshooting................................................................................................................................................... 4-9

4.6.1 Troubleshooting equipment....................................................................................................................... 4-9

4.6.2 Troubleshooting procedure........................................................................................................................ 4-9

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

ii

List of Illustrations

2 Connections and Installation

Figure 2-1 Model 7017 simplified schematic ................................................................................................................2-2

Figure 2-2 Model 7017 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...................................................................................................................2-5

3 Operation

Figure 3-1 “T” connector multiplexer expansion ..........................................................................................................3-4

Figure 3-2 Maintaining 50 Ω characteristic impedance ................................................................................................. 3-5

Figure 3-3 4 × 4 matrix connections..............................................................................................................................3-6

Figure 3-4 Filter testing .................................................................................................................................................3-7

Figure 3-5 Tape head production testing .......................................................................................................................3-8

4 Servicing

Figure 4-1 Connections for insertion loss tests..............................................................................................................4-3

Figure 4-2 Connections for channel isolation tests........................................................................................................4-5

Figure 4-3 Connections for center-to-shield isolation tests ...........................................................................................4-6

Figure 4-4 Connections for multiplexer-to-multiplexer isolation tests..........................................................................4-7

Figure 4-5 Block diagram ..............................................................................................................................................4-8

iii

List of Tables

4 Servicing

Table 4-1 Recommended verification equipment ........................................................................................................4-2

Table 4-2 Insertion loss values.....................................................................................................................................4-2

Table 4-3 Recommended troubleshooting equipment..................................................................................................4-9

Table 4-4 Troubleshooting procedure ........................................................................................................................4-10

5 Replaceable Parts

Table 5-1 Model 7017 parts list....................................................................................................................................5-2

v

1

General Information

1.1 Introduction

This section contains general information about the Model
7017 800MHz Multiplexer Card. The Model 7017 is equipped
with 2 four-channel multiplexers and is designed for 50 Ω op­eration.

1.2 Features

Key Model 7017 features include:

• Two independent four-channel multiplexers.

• Long relay contact life for high reliability.

•50 Ω characteristic impedance.

• 800MHz bandwidth.

• Low insertion loss (<1dB @ 100MHz).

• Low VSWR assures good high-frequency performance.

1.3 Warranty information

Warranty information is located on the inside front cover of
this manual. Should your Model 7017 require warranty ser­vice, contact the Keithley representativ e or authorized repair
facility in your area for more information. When returning
the card for repair, be sure to fill 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 addenda

Any improvements or changes concerning the card or manu­al 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 instru­ment or used in this manual.

!

The symbol on equipment indicates that you should re­fer to the operating instructions located in the instruction
manual.

The WARNING heading used in this manual explains dan­gers that could result in personal injury or death. Alw ays read
the associated information very carefully before performing
the indicated procedure.

The CAUTION heading used in this manual explains haz­ards that could damage the multiplexer card. Such damage
may invalidate the warranty.

1.6 Specifications

Model 7017 specifications are located at the front of this
manual.

1-1

General Information

1.7 Unpacking and inspection

1.7.1 Inspection for damage

The Model 7017 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 re­moving the card from the bag, observe the following han­dling precautions.

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
damage to the shipping agent immediately.

• When the card is not installed in a switching main­frame, 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 7017 or ­der:

• Model 7017 800MHz Multiplexer Card

• Model 7017 Instruction Manual

1.7.4 Instruction manual

If an additional Model 7017 Instruction Manual is required, or­der the manual package, Keithley part number 7017-901-00.
The manual package includes an instruction manual and any
pertinent addenda.

1.7.5 Repacking for shipment

Should it become necessary to return the Model 7017 for re­pair, carefully pack the unit in its original packing carton or
the equivalent, and include the following information:

• Call the Repair Department at 1-800-552-1115 for a
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.

1.8 Recommended cables and connectors

The recommended cable is RG223/U, and the recommended
connector type is SMA. Other 50 Ω cables may be used, but
consider key parameters such as maximum outside diameter,
attenuation over the desired frequency range, flexibility, and
shield type. See paragraph 3.5 in Section 3 for more informa­tion on cable parameters and how they affect performance.

• Additional accessories as ordered

1-2

2

Connections and Installation

2.1 Introduction

WARNING

The procedures in this section are intend­ed for qualified service personnel only. Do
not perform these procedures unless you
are qualified to do so. Failure to recognize
and observe normal safety precautions
could result in personal injury or death.

This section includes information on making connections to
the Model 7017 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 con­tamination from such foreign materials as body oils. Such
contamination can reduce isolation resistance. To avoid pos­sible contamination, always grasp the card by the side edges
or covers. Do not touch board surfaces, components, or con­nector insulators.

Dirt build-up over a period of time is another possible source
of contamination. To avoid this problem, operate the card in
a clean environment. If the card becomes contaminated, it
should be thoroughly cleaned as explained in paragraph 4.2.

2.3 Connections

The following paragraphs provide information for connect­ing external test circuitry to the Model 7017.

2.3.1 Simplified schematic

Figure 2-1 shows a simplified schematic diagram of the
Model 7017. The card is arranged into two separate multi­plexers, each with four channels.

2.3.2 Card configuration

Figure 2-2 shows the general configuration of the Model

7017. Connectors include:

• IN 1-8 (channels 1-8): Each input is equipped with an
SMA coaxial connector. The center conductor is the
signal path, while the outer shell is connected to signal
common.

• OUT A and OUT B: Each multiplexer is equipped with
an SMA coaxial connector. The center conductor is the
signal path, and the shell is connected to signal com­mon. Banks A and B common are isolated.

2-1

Connections and Installation

Figure 2-1

Model 7017 simplified schematic

IN 4

IN 3

OUT A

IN 2

IN 1

Multiplexer A

IN 8

IN 7

OUT B

IN 6

IN 5

Multiplexer B

Figure 2-2

Model 7017 card configuration

Multiplexer B

SMA Input/Output

Connectors

Multiplexer A

SMA Input/Output

Connectors

2-2

Connections and Installation

2.3.3 Input/output connecting cables

All connections to the multiplexer card input and output
jacks should be made using 50 Ω coaxial cable equipped with
SMA connectors. RG223/U is the recommended cable type.

WARNING

Make sure power is off and external en­ergy sources are discharged before con­necting or disconnecting cables.

NOTE

50 Ω cables must be used to ensure good
high-frequency performance. RG223/U ca­bles should be used for best performance.
See paragraph 3.5 for more information.

AC

Signals

2.3.4 Typical connecting scheme

Figure 2-3 shows a typical connecting scheme for the Mod­el 7017. In this arrangement, sources are connected to the
inputs, and the measuring instrument is connected to the
outputs.

CAUTION

Maximum voltage from any terminal
(center conductor or shield) to any other
terminal or chassis is 42V peak. Exceed­ing this value may result in card damage.

Figure 2-3

Typical connection scheme

IN 1

IN 2

OUT A

IN 3

IN 4

Measuring Instrument

Note: All cables are 50Ω

IN 5

IN 6

OUT B

IN 7

IN 8

2-3

Connections and Installation

2.4 Card installation and removal

The following paragraphs describe how to install and re­move the Model 7017 card assembly from the Model 7001/
7002 mainframe.

WARNING

Installation or removal of the Model
7017 should be performed by qualified
service personnel only. Failure to recog­nize and observe standard safety pre­cautions could result in personal injury
or death.

NOTE

To prevent performance degradation
caused by contamination, only handle the
card by the edges and covers.

2.4.1 Card installation

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.

After connecting the input/output cables, perform the fol­lowing 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 main­frame.

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.

Ejector Arms (2)

Unlock card

Lock card

Figure 2-4

Card installation in Model 7001

2-4

Connections and Installation

Ejector Arms

(locked position)

INTERCONNECTION, INSTALLATION AND REMOVAL OF CARDS BY QUALIFIED SERVICE PERSONNEL ONLY.

WARNING:

CARD

1

CARD

2

CARD

3

CARD

4

NO INTERNAL OPERATOR SERVICEABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

WARNING:

Figure 2-5

Card installation in Model 7002

2-5

3

Operation

3.1 Introduction

This section contains basic information on using the Model
7017 including signal limitations, switching considerations,
and applications. For detailed mainframe operating informa­tion, refer to the Model 7001 or Model 7002 Instruction
Manual.

3.2 Signal limitations

CAUTION

To prevent damage to the Model 7017,
do not exceed the maximum signal level
specifications of the card.

T o prev ent overheating or damage to the relays, ne ver exceed
the following maximum signal levels when using the Model
7017:

Maximum voltage: Any center conductor or shield to any

other center conductor or to chassis: 42V peak.

Maximum current: 1A carry, 0.5A switched per channel.
Maximum power: 10VA.

3.3 Front panel control

3.3.1 Closing and opening channels

To close a Model 7017 multiplexer channel, key in the
CHANNEL assignment (1 through 8), and then press the
Model 7001/7002 CLOSE key. For example, to close chan­nel 4 of a Model 7017 installed in slot 2, key in the following
channel list, and press CLOSE:

SELECT CHANNELS 2!4

To open a closed channel, press OPEN or OPEN ALL.

You can also simultaneously close one channel in each mul­tiplexer by including both channels in the channel list. For
example, to close channels 1 and 5 of a card in slot 1, enter
the following channel list:

SELECT CHANNELS 1!1,1!5

Note that channels are separated by a comma, which can be
inserted by pressing either the ENTER or right cursor key.

NOTE

To maintain 50 Ω characteristic imped­ance, close only one channel per multi­plexer simultaneously. Closing more than
one channel per multiplexer may cause
unexpected results. Program the Model
7001/7002 for restricted operation to
avoid closing more than one channel at a
time.

Model 7017 channels are organized into two multiplexer
banks as follows:

Multiplexer A: channels 1 to 4
Multiplexer B: channels 5 to 8

Again, you can open closed channels with the OPEN or
OPEN ALL key. OPEN opens only channels in the channel
list, and OPEN ALL opens all channels.

3-1

Operation

3.3.2 Scanning channels

To scan through channels, first configure a scan list, and then
program the Model 7001/7002 to perform a scan sequence.
You can create a scan list in the same manner as you would a
channel list. First, however , press the SCAN LIST ke y to select
the SCAN CHANNEL mode, and then enter the desired chan­nels to be included in the scan list. For example, the following
list scans channels 1, 3, and 5 through 8 of a Model 7017 in­stalled in slot 2:

SCAN CHANNELS 2!1, 2!3, 2!5-2!8
Note that channels are scanned in the order they appear in the

scan list.
To perform a manual scan, select the RESET default condi-

tions in the SAVESETUP menu of the main MENU. Press
STEP to take the mainframe out of the idle state, and then
manually scan through channels by pressing the STEP key.

For information on more complex scan sequences, refer to the
Model 7001 or 7002 Instruction Manual.

3.4 IEEE-488 bus control

3.4.1 Closing and opening channels

Use the following SCPI commands to close and open channels:
:CLOS <list>

:OPEN <list> | ALL
For example, the following command will close channels 2

and 6 of a Model 7017 installed in slot 1:
:CLOS (@ 1!2,1!6)
Conversely, either of the commands below will open previous-

ly closed channels 2 and 6:
:OPEN (@ 1!2,1!6)

:OPEN ALL
Do not close more than one channel per multiplexer to main-

tain 50 Ω characteristic impedance.

The *RST command selects the default scan configuration,
while the second command automatically sets the channel
count to the number of channels in the scan list. The
:ROUT:SCAN command programs the scan list, and the
:INIT command takes the mainframe out of the idle state.

For example, send the following commands to scan through
all eight channels of a Model 7017 installed in slot 1:

*RST
:TRIG:SEQ:COUN:AUT ON
:ROUT:SCAN (@ 1!1:1!8)
:INIT

3.5 Switching considerations

Signals passing through the Model 7017 Multiplexer Card
are subject to various effects that can influence their charac­teristics. The following paragraphs discuss some of these ef­fects and ways to minimize them.

3.5.1 Card characteristics

Insertion loss

Insertion loss indicates signal power lost while passing
through the card. This loss occurs in the various signal path
components through the card (connectors, PC board traces,
and relays). The amount of power lost depends on the partic­ular insertion loss specification as well as the applied power .
For example, with an insertion loss of 1dB and a 10W source
signal applied to the card, about 2W will be dissipated in the
card, and approximately 8W will appear at the load. Note
that, as with most transmission lines, Model 7017 insertion
loss values increase with increasing frequency.

Capacitance

Model 7017 capacitance values are small enough to be of lit­tle concern in most applications. In some applications, ca­pacitance may be a factor (primarily with pulse signals
where capacitance can affect rise times).

Crosstalk

3.4.2 Scanning channels

You can perform a simple scan using the following four com­mands:

*RST
:TRIG:SEQ:COUN:AUT ON
:ROUT:SCAN <list>
:INIT

3-2

Crosstalk figures indicate the amount of signal leakage be­tween channels or switches on the card. With similar power
levels applied to the various channels, crosstalk will be of lit­tle consequence. W ith widely dif ferent po wer le v els, howev­er, crosstalk may produce undesired results. For example,
assume that 10W is applied to channel 1, and 1mW is applied
to channel 2. Assuming a -60dB crosstalk figure, the unwant­ed signal coupled from channel 1 to channel 2 will only be
20dB below the desired channel 2 signal.

Operation

VSWR

VSWR (Voltage Standing W a ve Ratio) is the ratio of the max­imum and minimum voltages along a transmission path. It in­dicates the degree of impedance mismatch. In a perfectly
matched system, the VSWR is 1, while open and shorted paths
have infinite VSWR values. Since VSWR is related to both the
return loss and reflection coefficient, VSWR figures indicate
the degree of signal loss and reflection. The lower the VSWR
figure, the less signal attenuation that occurs along the trans­mission path.

Path isolation resistance

The path isolation resistance is the equivalent resistance be­tween two given connecting points on the card and is of impor ­tance primarily for DC and low-frequency A C signals switched
by the card. The effects of this characteristic depend on the par­ticular isolation specification. Center-to-shield isolation resis­tance, for example, may cause loading problems with signals
having high source resistance. Channel-to-channel isolation re­sistance may result in leakage currents generated in one chan­nel caused by a voltage source connected to another channel.

3.5.2 Cable characteristics

Characteristic impedance (Zo)

Cable termination

Proper cable termination is imperative to ensure maximum
signal transfer and to minimize VSWR and signal reflec­tions. In the case of Model 7017 operation, both source and
load impedances should be as close to 50 Ω as possible to
assure optimum matching and maximum power transfer.
For example, if a 50 Ω cable is terminated with 100 Ω , the
reflection coefficient is 0.33, the VSWR increases to 2, and
the return loss is reduced to less than 10dB.

Distributed capacitance

The distributed capacitance of the cable may be a factor , but
generally only for pulse type signals where rise times are a
consideration. The recommended RG223/U cable, for exam­ple, has a nominal distributed capacitance of 30.8pF/ft.

Cable connectors

Cable connectors are necessary to conveniently make signal
connections to various points in a switching system. While
SMA connector designs are optimized for best performance,
some small impedance mismatch at connecting points is vir­tually inevitable. For that reason, it is considered good prac­tice to minimize the number of connectors used in a
transmission path, especially at higher frequencies.

Characteristic impedance is the value of cable impedance ob­tained by an RF measurement at either end. For example, a
cable with a 50 Ω characteristic impedance is equivalent to a
50 Ω resistor with sufficient length to connect two compo­nents. (The characteristic impedance of a cable depends on
the relative diameters of the inner and outer conductors, as
well as on the dielectric constant of the insulating material.)
Since the Model 7017 is designed to work with 50 Ω cables,
you must use 50 Ω cables to assure proper impedance match­ing. (RG223/U cable is recommended.) Mismatching any­where along the transmission path will increase VSWR and
signal reflections, decrease return loss, and consequently re­sult in signal attenuation.

Cable attenuation

Cable attenuation is analogous to insertion loss of the card it­self in that it defines the degree of attenuation of the signal as
it passes through the cable. Cable attenuation factors are gen­erally given in dB per 100 ft. and increase with rising fre­quency. For example, the recommended RG223/U cable has
an attenuation factor of 8.8dB/100 ft. @ 400MHz.

3.6 Applications

The Model 7017 is designed primarily for RF switching ap­plications at frequencies up to 800MHz. The following para­graphs discuss typical RF applications for the Model 7017,
including multiplexer expansion, filter testing, and tape head
production testing.

3.6.1 Multiplexer expansion

Basic “T” configuration

The simplest way to connect two Model 7017 multiplexers
together for expansion is to use the classic “T” configuration
shown in Figure 3-1. Note that this configuration results in a
1-of-8 multiplexer. Although this configuration is useful in
many applications, the ideal 50 Ω characteristic impedance
will not be maintained. Consequently, VSWR will increase,
affecting card insertion loss particularly at higher frequen­cies. Considerable transmission path reflections will also oc­cur, which is an important consideration when switching
pulse signals.

3-3

Operation

IN 1

IN 2

OUT A

IN 3

IN 4

"T"

Connector

IN 5

IN 6

OUT B

Multiplexer A

Instrument

Note: This configuration
will not maintain
50Ω characteristic
impedance.

Multiplexer B

Figure 3-1

“T” connector multiplexer expansion

3-4

IN 7

IN 8

Model 7017

Operation

Maintaining 50 Ω characteristic impedance

The proper method for connecting two Model 7017 multiplex­ers together is shown in Figure 3-2. Here, the A and B outputs
of one Model 7017 are connected to two inputs of multiplexer
A of a second Model 7017 card. With this configuration, the
proper 50 Ω characteristic impedance is maintained for opti­mum bandwidth and minimal signal loss and reflections.

IN 1

IN 2

OUT A

IN 3

Matrix connections

A 4 × 4 matrix may be formed by connecting the two out­puts together using a short coaxial cable, as shown in Figure
3-3. Note that this connection scheme provides a conv enient
way to connect four DUTs to four different test instruments.
This method also maintains the proper 50 Ω characteristic
impedance.

IN 1

IN 4

IN 5

IN 6

OUT B

IN 7

IN 8

IN 2

OUT A

IN 3

Note: This configuration maintains
50Ω characteristic impedance.

IN 4

Model 7017 #2

Instrument

Figure 3-2

Maintaining 50

Model 7017 #1

Ω

characteristic impedance

3-5

Operation

IN 1

IN 2

Multiplexer A

Multiplexer B

OUT A

IN 3

IN 4

IN 5

IN 6

OUT B

IN 7

DUT Connections

Short 50Ω

Coax Cable

Instrument Connections

Figure 3-3

4

×

4 matrix connection

3-6

DUTs

IN 8

Model 7017

A. Connections

Power

Meter

Spectrum

Analyzer

Counter

Network

Analyzer

1

2

3

4

B. 4 x 4 Matrix Configuration

Operation

3.6.2 Filter testing

Filter frequency response and phase characteristics are key
circuit parameters that often require testing. The Model 7017
may be used in conjunction with a network analyzer to test
multiple filters on an automated basis.

Figure 3-4 shows a typical circuit configuration for testing
four filters. Note that the network analyzer input is connected
to the output of one Model 7017 multiplexer. One terminal
of each DUT is connected to a corresponding Model 7017
channel, while the remaining DUT terminals are connected
in common to the network analyzer output port.

The basic configuration shown in Figure 3-4 may also be
used for a variety of other tests. For example, the same gen­eral scheme may be used to test amplifier S-parameters.

3.6.3 Tape head production testing

The Model 7017 can be used with an LCR bridge to produc­tion test tape heads. Such testing generally involv es measuring
device impedance variations to help control manufacturing
processes.

Figure 3-5 shows the general circuit configuration for pro­duction testing using the Model 7017 along with a suitable
LCR bridge. Since 4-wire connections are required for such
measurements, a minimum of two Model 7017 cards are
necessary for this application. Each multiplexer switches
one of the four required signal paths to the DUTs, and each
pair of cards can test a maximum of four devices. Additional
cards can be added as described in paragraph 3.6.1 to ex­pand device test capabilities by adding more multiplexer
channels.

Key parameters and advantages for using the Model 7017 for
these production tests are:

• Small-signal, high-frequency AC switching: 20mV,
100 µ A @ 10MHz.

8

• Long relay life: >10

closures.

• High repeatability with little resistance variation be­tween closures: < 10m Ω .

Network Analyzer

IN (PORT 1) OUT (PORT 2)

IN 1

IN 2

OUT A

IN 3

IN 4

IN 5

Filter 1

IN 6

OUT B

Filter 2

IN 7

Filter 3

IN 8

Figure 3-4

Filter testing

Filter 4

Model 7017

3-7

Operation

Model

7017

#1

IN 1

IN 2

OUT A

IN 3

IN 4

IN 5

IN 6

OUT B

IN 7

Model

7017

#2

IN 8

IN 1

IN 2

OUT A

IN 3

IN 4

IN 5

IN 6

OUT B

IN 7

Tape Head

(1 of 4)

L

CUR

LCR Meter

L

POTHPOTHCUR

Figure 3-5

Tape head production testing

3-8

IN 8

4

Servicing

4.1 Introduction

This section contains information necessary to service the
Model 7017 and includes information on handling and clean­ing, performance verification, as well as principles of opera­tion and troubleshooting.

WARNING

The information in this section is intended
for qualified service personnel only. Some
of the procedures may expose you to haz­ardous voltages that could result in per­sonal injury or death. Do not perform
these procedures unless you are qualified
to do so.

4.2 Handling and cleaning precautions

Because of the high-impedance areas on the Model 7017,
care should be taken when handling or servicing the card to
prevent possible contamination. The following precautions
should be observed when servicing the card.

• Do not touch areas adjacent to electrical contacts.

• When servicing the card, wear clean cotton gloves.

• Do not store or operate the card in an environment
where dust could settle on the circuit board.

• Use dry nitrogen gas to clean dust off of the board if
necessary.

4.2.2 Soldering considerations

Should it become necessary to use solder on the circuit
board, observe the following precautions:

• Use an OA-based (organic acti v ated) flux, and take care
not to spread the flux to other areas of the circuit board.

• Remove the flux from the work areas when the repair
has been completed. Use pure water along with clean
cotton swabs or a clean soft brush to remove the flux.

• Once the flux has been removed, swab only the repaired
area with methanol, and then blow-dry the board with
dry nitrogen gas.

• After cleaning, allow the card to dry in a 50 ° C low­humidity environment for several hours before use.

4.2.1 Handling precautions

Observe the following precautions when handling the multi­plexer card:

• Handle the card only by the edges and shields.

• Do not touch connector insulators.

• Do not touch any board surfaces or components not as­sociated with the repair.

4.3 Performance verification

The following paragraphs provide performance verification
procedures for the Model 7017. These tests include insertion
loss and isolation tests.

4-1

Servicing

4.3.1 Environmental conditions

All performance verification measurements should be made
at an ambient temperature of 18 ° C to 28 ° C and <70% rela­tive humidity.

4.3.2 Recommended verification equipment

Table 4-1 summarizes the test equipment recommended for
performance verification. Alternate equipment may be used
as long as the corresponding specifications are at least as
good as those listed.

Table 4-1

Recommended verification equipment

Manufacturer

Description

Network
Analyzer

Test Set
Cable Set
Electrometer

and Model Specifications Test

HP8754A

HP8753C
HP11851
Keithley 6517

10MHz-800MHz

1G Ω , ± 0.226%

Insertion
loss

Isolation

4.3.3 Insertion loss tests

Insertion loss tests are performed by applying a 10MHz­800MHz signal from a network analyzer to the Model 7017
channel inputs and then measuring the amount of attenuation
as the signal passes through the card.

Perform the following steps:

1. Set the network analyzer to sweep the 10MHz to
800MHz frequency range.

2. Normalize the analyzer reference channel to 0dB on the
display.

3. Connect the network analyzer to the Model 7017 as
shown in Figure 4-1. Be sure to use 50 Ω cables and set
up for all insertion loss tests.

4. Install the Model 7017 in the Model 7001 or 7002 main­frame.

5. Close channel 1 on the Model 7017 card.

6. Verify that the insertion loss values are within the limits
shown in Table 4-2.

7. Open the closed channel.

8. Repeat steps 3 through 7 for channels 2 through 8. For
each channel:

• Connect the analyzer signal to the input jack of the

channel being tested.

• Be sure the signal output cable is connected to the

correct output jack.

• Close only the channel being tested.

• Verify that the insertion loss values at the various fre-

quencies are within the limits stated in Table 4-2.

Table 4-2

Insertion loss values

Frequency Insertion loss

10MHz
100MHz
500MHz
800MHz

<0.35dB
<1dB
<2dB
<3dB

4-2

Servicing

Channel 1 Connections Shown

IN 1

Network Analyzer

IN 2

OUT A

IN 3

IN 4

IN 5

IN 6

OUTPUT INPUT

50Ω Cables

Figure 4-1

Connections for insertion loss tests

OUT B

IN 7

IN 8

Model 7017

4-3

Servicing

4.3.4 Isolation tests

Isolation tests check the leakage resistance (isolation) be­tween various Model 7017 terminals using the ohms func­tion of a Model 6517 Electrometer.

CAUTION

The following tests use the Model 6517
voltage source to measure resistance. Do
not apply more than 42V to the Model
7017 to avoid card damage.

Channel isolation tests

Perform the following steps to check channel isolation:

1. Connect the Model 6517 Electrometer to the center con­ductors of channels 1 and 2, as shown in Figure 4-2.

2. With the power off, install the Model 7017 card in the
mainframe.

3. Turn on the mainframe and the Model 6517 power, and
allow the electrometer to warm up for at least one hour
before making measurements. Make sure the voltage
source is turned off.

4. Select the Model 6517 ohms function, choose the 2G Ω
range, and make sure zero check is disabled.

5. Close channel 1 on the Model 7017.

6. Program the Model 6517 voltage source for 40V, and
make sure the internal voltage source connection mode
is selected.

7. Turn on the Model 6517 voltage source, and allow the
reading to settle.

8. Verify that the Model 6517 resistance reading is >1G Ω .

9. Turn off the voltage source, and open channel 1.

10. Repeat the procedure for channels 2 through 4, measur­ing the resistance between the center conductor of each
channel and the center conductors of all other channels
of multiplexer A. For each test:

• Connect the electrometer to the center conductors of

the two channels being tested.

• Close only one of the channels being tested.

11. Repeat the entire procedure to test channel isolation be­tween all multiplexer B channels (channels 5 through 8).

Center-to-shield isolation

Perform the following steps to check center-to-shield isolation:

1. Connect the Model 6517 Electrometer to the center con­ductor and shield of channel 1, as shown in Figure 4-3.

2. With the power off, install the Model 7017 card in the
mainframe.

3. Turn on the mainframe and the Model 6517 power, and
allow the electrometer to warm up for at least one hour
before making measurements. Make sure the voltage
source is turned off.

4. Select the Model 6517 ohms function, choose the 2G Ω
range, and make sure zero check is disabled.

5. Close channel 1 on the Model 7017.

6. Program the Model 6517 voltage source for 40V, and
make sure the internal voltage source connection mode
is selected.

7. Turn on the Model 6517 voltage source, and allow the
reading to settle.

8. Verify that the Model 6517 resistance reading is >1G Ω .

9. Turn off the voltage source, and open channel 1.

10. Repeat the procedure for channels 2 through 8, measur­ing the resistance between the center conductor and
shield of each channel. For each test:

• Connect the electrometer to the center conductor and

shield of the channel being tested.

• Close only the channel being tested.

Multiplexer-to-multiplexer isolation

Perform the following steps to check multiplexer -to-multiplexer
isolation:

1. Connect the Model 6517 Electrometer to the center con­ductors of channels 1 and 5, as shown in Figure 4-4.

2. With the power off, install the Model 7017 card in the
mainframe.

3. Turn on the mainframe and the Model 6517 power, and
allow the electrometer to warm up for at least one hour
before making measurements. Make sure the voltage
source is turned off.

4. Select the Model 6517 ohms function, choose the 2G Ω
range, and make sure zero check is disabled.

5. Close channels 1 and 5 on the Model 7017.

6. Program the Model 6517 voltage source for 40V, and
make sure the internal voltage source connection mode
is selected.

7. Turn on the Model 6517 voltage source, and allow the
reading to settle.

8. Verify that the Model 6517 resistance reading is >1G Ω .

9. Turn off the voltage source, and open channels 1 and 5.

4-4

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

Servicing

SMA-to-BNC to triax adapter

Triax Cable

IN 1

Connect voltage source low
to card signal low

IN 2

OUT A

IN 3

IN 4

IN 5

IN 6

OUT B

IN 7

Input

Voltage Source High

1010V
PEAK

PREAMP OUT

TEMP

TYPE K

250 PEAK

OPTION SLOT

COMMON 2V ANALOG

!

INPUT

250V PEAK

OUTPUT

HUMIDITY

LO

750V

PEAK

EXT TRIGINMTR COMP

RS232

V SOURCE

INTERLOCK

HI

SELECTED

LINE VOLTA GE

90-110V

180-220V

105-125V

210-250V

LINE RATING

50-60HZ

115V

50VA MAX

TRIG LINK

AC ONLY

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

OUT

DIGITAL

I/O

!

IEEE-488

LINE FUSE

SLOWBLOW

1/2A 90-125V

1/4A 180-250V

MADE

IN

U.S.A.

Model 6517 Electrometer

Note: Configure electrometer for
internal voltage source
connection.

Figure 4-2

Connections for channel isolation tests

IN 8

Model 7017

4-5

Servicing

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

IN 1

IN 2

OUT A

IN 3

Adapter (see Figure 4-2)

Triax Cable

Input

!

INPUT

250V PEAK

PREAMP OUT

TEMP

TYPE K

250 PEAK

OPTION SLOT

1010V
PEAK

OUTPUT

HUMIDITY

LO

750V
PEAK

EXT TRIGINMTR COMP

RS232

V SOURCE

INTERLOCK

!

COMMON 2V ANALOG

Model 6517 Electrometer

Voltage Source High

HI

SELECTED

LINE VOLTA GE

90-110V

180-220V

105-125V

210-250V

LINE RATING

115V

OUT

DIGITAL

TRIG LINK

I/O

50-60HZ
50VA MAX
AC ONLY

IEEE-488

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

LINE FUSE

SLOWBLOW

1/2A 90-125V

1/4A 180-250V

MADE

IN

U.S.A.

IN 4

IN 5

IN 6

OUT B

IN 7

IN 8

Note: Configure electrometer for
internal voltage source
connection.

Model 7017

Figure 4-3

Connections for center-to-shield isolation tests

4-6

IN 1

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

IN 2

OUT A

IN 3

Adapter (see Figure 4-2)

Triax Cable

Input

Servicing

Voltage Source High

1010V
PEAK

PREAMP OUT

TEMP

TYPE K

250 PEAK

OPTION SLOT

COMMON 2V ANALOG

!

INPUT

250V PEAK

OUTPUT

HUMIDITY

LO

750V
PEAK

EXT TRIGINMTR COMP

RS232

V SOURCE

INTERLOCK

HI

SELECTED

LINE VOLTA GE

90-110V

180-220V

105-125V

210-250V

LINE RATING

50-60HZ

115V

50VA MAX

TRIG LINK

AC ONLY

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

OUT

DIGITAL

I/O

!

Model 6517 Electrometer

IEEE-488

LINE FUSE

SLOWBLOW

1/2A 90-125V

1/4A 180-250V

MADE

IN

U.S.A.

IN 4

IN 5

IN 6

OUT B

IN 7

IN 8

Note: Configure electrometer for
internal voltage source
connection.

Figure 4-4

Connections for multiplexer-to-multiplexer isolation tests

Model 7017

4-7

Servicing

4.4 Special handling of static-sensitive devices

CMOS and other high-impedance devices are subject to pos­sible static discharge damage because of the high-impedance
levels involved. When handling such devices, observe the
following precautions.

NOTE

To prevent damage, assume all parts are
static-sensitive.

• Such devices should be transported and handled only in
containers specially designed to prevent or dissipate
static build-up. Typically, these devices will be recei ved
in anti-static containers made of plastic or foam.

• Keep these parts in their original containers until ready
for installation or use.

• Remove the devices from their protective containers
only at a properly grounded workstation. Also, ground
yourself with an appropriate wrist strap while working
with these devices.

• Handle the devices only by the body; do not touch the
pins or terminals.

• Any printed circuit board into which the device is to be
inserted must first be grounded to the bench or table.

• Use only anti-static type de-soldering tools and
grounded-tip soldering irons.

4.5 Principles of operation

The following paragraphs discuss the basic Model 7017 op­erating principles that can be used as an aid in troubleshoot­ing the card. The schematic diagram of the card is located at
the end of Section 5.

4.5.1 Block diagram

Figure 4-5 shows a simplified block diagram of the Model

7017. Key sections include the relay data control circuits, the
relay driver ICs, the relays, and the card configuration mem­ory. These elements are discussed in the following para­graphs.

Figure 4-5

Block diagram

From

Mainframe

To

Mainframe

Power Up/Down

Data
Clock

Strobe

Safeguard

Memory

U103

Relay

Drivers

U101,

U102

+6V

Out A

MUX

A

K101-K106

Out B

MUX

B

K107-K112

1
2

Multiplexer A

Inputs

3
4

5
6

Multiplexer B

Inputs

7
8

4-8

Servicing

4.5.2 Relay control

Card relays are controlled by serial data transmitted from the
host switching mainframe via the DATA line. Each control
byte is shifted in serial fashion into latches located in the card
relay driver IC (U102). The serial data is clocked in by the
CLK (clock) line.

Once the relay control byte has been shifted into the card, the
STR line is set high to latch the relay information into the Q
outputs of the relay drivers, and the appropriate relays are en­ergized (assuming the driver outputs are enabled, as discussed
below). Note that a relay driver output goes low to energize
the corresponding relay. Additional drive capability for relays
K103, K106, K109, and K110 is provided by U101.

The output enable (OE) line of U102 is controlled by the
power-up/power-down safeguard circuit located in the main­frame. This circuit assures that no card relays are inadvertent­ly energized when the mainframe power is turned on or of f.

4.5.3 Switching circuits

Signal switching is performed by relays K101 through K112.
K101, K102, K105, and K106 switch channels 1 through 4,
while K107, K108, K111, and K112 switch channels 5
through 8. K103 and K104 provide additional switching to
assure proper isolation for multiplexer A, while K109 and
K110 provide a similar function for multiplexer B.

4.5.4 Card configuration memory

Card configuration information is stored in U103. This infor­mation is serially read by the mainframe during power-up
and lets the unit determine the card model number and card
relay configuration information so the mainframe can con­trol the appropriate relays accordingly.

4.6 Troubleshooting

4.6.1 Troubleshooting equipment

Table 4-3 summarizes recommended equipment for trouble­shooting the Model 7017.

Table 4-3

Recommended troubleshooting equipment

Manufacturer

Description

Multimeter
Oscilloscope

4.6.2 Troubleshooting procedure

Table 4-4 summarizes multiplexer card troubleshooting
steps. Refer to the schematic diagram and component layout
drawing at the end of Section 5 for component locations.

and Model Application

Keithley 2000
TEK 2243

CAUTION

Use care when removing relays from the
PC board to avoid pulling traces away
from the circuit board. Before attempt­ing to remove a relay, use an appropri­ate de-soldering tool to clear each
mounting hole completely free of solder.
Each relay pin must be free to move in
its mounting hole before removal. Also,
make sure no burrs are present on the
ends of the relay pins.

DCV checks
View logic waveforms

4-9

Servicing

Table 4-4

Troubleshooting procedure

Step Item/component Required condition Comments

1

Digital common
P2001, pins 15 and 16

2

P2001, pin 1

3

P2001, pin 13

4

U102, pin 2

5

U102, pin 3

6

U102, pin 7

7

U102, pins 11 through 18

8

U101, pins 4, 6, 15, 17

+6V
+5V
CLK pulses
DATA pulses
STR pulses
Low with relay on, high with relay off.
Low with relay on, high with relay off.

All voltages referenced to digital common.

Card +6V relay supply voltage.
Card +5V logic supply.
During relay update sequence only.
During relay update sequence only.
During relay update sequence only.
Relay driver outputs.
K103, K106, K109, K110 only.

4-10

5

Replaceable Parts

5.1 Introduction

This section contains replacement parts information, sche­matic diagrams, and component layout drawings for the
Model 7017.

5.2 Parts list

The parts list for the multiplexer card is included in tables in­tegrated with the schematic diagram and component layout
drawing. Parts are listed alphabetically in order of circuit
designation.

5.3 Ordering information

To place an order or to obtain information concerning re­placement parts, contact your Keithley representative or the
factory (see the inside front cover for addresses). When or­dering parts, be sure to include the following information:

• Card model number (7017)

• Card serial number

• Part description

• Circuit description, if applicable

• Keithley part number

5.4 Factory service

If the card is to be returned to Keithley Instruments for repair ,
perform the following:

• Call the Repair Department at 1-800-552-1115 for a
Return Material Authorization (RMA) number.

• Complete the service form at the back of this manual
and include it with the card.

• Carefully pack the card in the original packing carton.

• Write ATTENTION REPAIR DEPARTMENT and the
RMA number on the shipping label.

NOTE

It is not necessary to return the switching
mainframe with the card.

5.5 Component layout and schematic diagram

A component layout drawing and schematic diagram are in­cluded on the following pages integrated with the parts list.

5-1

Replaceable Parts

Table 5-1

Model 7017 parts list

Circuit design. Description

Keithley
part number

PROGRAMMED EPROM
C101,102,103
C104,105
J1001-1005,

CAP, .1UF,20%,50V,CERAMIC

CAP, 10UF,-20+100%,25V,ALUM ELEC

RT. ANGLE JACK RECEPTACLE

1010-1014
K101-112
P2001
U101
U102
U103

* Order same firmware revision level as present part.

RELAY (SPST),GORDOS,4705S
CONNECTOR, 32-PIN, 2-ROWS
IC, 8-CHANNEL DRIVER, 2597A
IC, 8-BIT SERIAL-IN LATCHDRIVER,5841A
IC, SERIAL EPROM, 24C01P

7017-800-*
C-365-.1
C-314-10
CS-905

RL-131
CS-775-1
IC-538
IC-536
IC-737

5-2

Index

A

Applications 3-3

B

Basic “T” configuration 3-3
Block diagram 4-8

C

Card characteristics 3-2, 3-3
Card configuration 2-1
Card configuration memory 4-9
Card installation and removal 2-4
Closing and opening channels 3-1, 3-2
Component layout and schematic

diagram 5-1

Connections and installation 2-1

E

Environmental conditions 4-2

H

Handling and cleaning precautions 4-1
Handling precautions 1-2, 2-1, 4-1

I

IEEE-488 bus control 3-2
Input/output connecting cables 2-3
Insertion loss tests 4-2
Inspection for damage 1-2
Instruction manual 1-2
Isolation tests 4-4

M

Manual addenda 1-1
Multiplexer expansion 3-3

O

Operation 3-1
Ordering information 5-1

S

Safety symbols and terms 1-1
Scanning channels 3-2
Servicing 4-1
Shipment contents 1-2
Signal limitations 3-1
Simplified schematic 2-1
Soldering considerations 4-1
Special handling of static-sensitive

devices 4-8
Specifications 1-1
Switching circuits 4-9
Switching considerations 3-2

T

Tape head production testing 3-8
Troubleshooting 4-9
Troubleshooting equipment 4-9
Troubleshooting procedure 4-9
Typical connecting scheme 2-3

U

F

Factory service 5-1
Features 1-1
Filter testing 3-8
Front panel control 3-1

G

General information 1-1

P

Parts list 5-1
Performance verification 4-1
Principles of operation 4-8

R

Recommended cables and connectors 1-2
Recommended verification equipment

4-2
Relay control 4-9
Repacking for shipment 1-2
Replaceable parts 5-1

Unpacking and inspection 1-2

W

Warranty information 1-1

i-1

Service Form

Model No. Serial No. Date

Name and Telephone No.

Company

List all control settings, describe problem and check boxes that apply to problem.

Intermittent

❏
❏

IEEE failure
Front panel operational

❏

Display or output (check one)

Drifts

❏

Unstable

❏
❏

Overload

❏

Calibration only

Data required

❏

(attach any additional sheets as necessary)

Show a block diagram of your measurement system including all instruments connected (whether power is turned on or not).
Also, describe signal source.

Analog output follows display

❏
❏

Obvious problem on power-up
All ranges or functions are bad

❏

Unable to zero

❏

Will not read applied input

❏

❏

CertiÞcate of calibration required

Particular range or function bad; specify

❏
❏

Batteries and fuses are OK
Checked all cables

❏

Where is the measurement being performed? (factory, controlled laboratory, out-of-doors, etc.)

What power line voltage is used? Ambient temperature? ¡F

Relative humidity? Other?

Any additional information. (If special modiÞcations have been made by the user, please describe.)

Be sure to include your name and phone number on this service form

.

Keithley Instruments, Inc.

28775 Aurora Road
Cleveland, Ohio 44139

Printed in the U.S.A.