Keithley 7090 Service manual

Model 7090 Optical Switch Card

Instruction Manual

A GREATER MEASURE OF CONFIDENCE

W ARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a
period of 1 year from date of shipment.

Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables,
rechargeable batteries, diskettes, and documentation.

During the warranty period, we will, at our option, either repair or replace any product that proves to be defecti ve.
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 original warranty period, or at least 90 days.

LIMIT A TION OF W ARRANTY

This warranty does not apply to defects resulting from product modification without Keithley’s express written
consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-rechar geable
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 T O ANY PERSON, OR DAMAGE T O PROPER TY.

Keithley Instruments, Inc.

Sales Offices: BELGIUM: Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02-363 00 40 • Fax: [phone]

CHINA: Y uan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-6202-2886 • Fax: [phone]
FINLAND: Tietäjäntie 2 • 02130 Espoo • Phone: [phone] • Fax: [phone]
FRANCE: 3, allée des Garays • 91127 Palaiseau Cédex • 01-64 53 20 20 • Fax: [phone]
GERMANY: Landsberger Strasse 65 • 82110 Germering • 089/84 93 07-40 • Fax: [phone]
GREAT BRITAIN: Unit 2 Commerce Park, Brunel Road • Theale • Berkshire RG7 4AB • 0118 929 7500 • F ax: 0118 929 7519
INDIA: Flat 2B, Willocrissa • 14, Rest House Crescent • Bangalore 560 001 • 91-80-509-1320/21 • Fax: [phone]
ITALY: Viale San Gimignano, 38 • 20146 Milano • 02-48 39 16 01 • Fax: [phone]
KOREA: FL., URI Building • 2-14 Yangjae-Dong • Seocho-Gu, Seoul 137-130 • 82-2-574-7778 • Fax: [phone]
NETHERLANDS: Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: [phone]
SWEDEN: c/o Regus Business Centre • Frosundaviks Allé 15, 4tr • 169 70 Solna • 08-509 04 679 • F ax: 08-655 26 10
SWITZERLAND: Kriesbachstrasse 4 • 8600 Dübendorf • 01-821 94 44 • Fax: [phone]
TAIWAN: 1FL., 85 Po Ai Street • Hsinchu, Taiwan, R.O.C. • 886-3-572-9077• Fax: [phone]

28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: [phone]

1-888-KEITHLEY (534-8453) • www.keithley.com

© Copyright 2001 Keithley Instruments, Inc.

Printed in the U.S.A.

11/01

Model 7090 Optical Switch Card

Instruction Manual

©2001, Keithley Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

Third Printing, December 2001

Document Number: 7090-901-01 Rev. C

Manual Print History

The print history shown below lists the printing dates of all Revisions and Addenda created
for this manual. The Revision Le vel letter increases alphabetically as the manual under goes 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 Re vision is created, all Addenda associated with the previous Re vision
of the manual are incorporated into the new Revision of the manual. Each ne w Revision includes
a revised copy of this print history page.

Revision A (Document Number 7090-901-01)................................................................. July 2001

Revision B (Document Number 7090-901-01)........................................................... October 2001

Revision C (Document Number 7090-901-01)....................................................... December 2001

All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand names are trademarks or registered trademarks of their respective holders.

S

afety 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 and follow all installation, operation, and maintenance information carefully before us­ing the product. Refer to the manual for complete product specifications.

If the product is used in a manner not specified, the protection provided by the product may be impaired.
The types of product users are:

Responsible body

ment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.

Operators

instrument. They must be protected from electric shock and contact with hazardous live circuits.

Maintenance personnel

voltage or replacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state
if the operator may perform them. Otherwise, they should be performed only by service personnel.

Service personnel

trained service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are rated Installation Category I and Installation Category II,

as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and data
I/O signals are Installation Category I and must not be directly connected to mains voltage or to voltage sources with high tran­sient over-voltages. Installation Cate gory II connections require protection for high transient over -voltages often associated with
local A C mains connections. Assume all measurement, control, and data I/O connections are for connection to Category I sourc­es unless otherwise marked or described in the Manual.

Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fixtures.
The American National Standards Institute (ANSI) states that a shock hazard exists when v oltage le vels greater than 30V RMS,

42.4V peak, or 60VDC are present.

circuit before measuring.

Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators
are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators 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,

Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limited sourc­es. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective de­vices to limit fault current and voltage to the card.

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

When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input pow­er disconnect device must be provided, in close proximity to the equipment and within easy reach of the operator.

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

is the individual or group responsible for the use and maintenance of equipment, for ensuring that the equip-

use the product for its intended function. They must be trained in electrical safety procedures and proper use of the

perform routine procedures on the product to keep it operating properly, for example, setting the line

are trained to work on live circuits, and perform safe installations and repairs of products. Only properly

A good safety practice is to expect that hazardous voltage is present in any unknown

no conductive part of the circuit may be exposed.

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.

The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the
equipment may be impaired.

Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating in­formation, and as shown on the instrument or test fixture panels, or switching card.

When fuses are used in a product, replace with same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use

of a lid interlock.
If a screw is present, connect it to safety earth ground using the wire recommended in the user documentation.

!

The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.

The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined effect of
normal and common mode voltages. Use standard safety precautions to avoid personal contact with these voltages.

The

WARNING

information very carefully before performing the indicated procedure.

CAUTION

The
ranty.

Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
T o maintain protection from electric shock and fire, replacement components in mains circuits, including the power transformer ,

test leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses, with applicable national safety ap­provals, may be used if the rating and type are the same. Other components that are not safety related may be purchased from
other suppliers as long as they are equivalent to the original component. (Note that selected parts should be purchased only
through Keithley Instruments to maintain accuracy and functionality of the product.) If you are unsure about the applicability
of a replacement component, call a Keithley Instruments office for information.

To clean an instrument, use a damp cloth or mild, water based cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with
no case or chassis (e.g., data acquisition board for installation into a computer) should never require cleaning if handled accord­ing to instructions. If the board becomes contaminated and operation is affected, the board should be returned to the factory for
proper cleaning/servicing.

heading in a manual explains dangers that might result in personal injury or death. Al ways read the associated

heading in a manual explains hazards that could damage the instrument. Such damage may inv alidate the war -

11/01

Model 7090 1xN Series Optical Switch Card Specifications

General Specifications:

Switching Time

(1)

Reset/Open

Settle/Close

Maximum Switch
Drive Current:

Dimensions Width

Length

Height
Weight 0.66kg
Temperature Operating

Storage
Relative Humidity Up to 35 oC <80% RH Non-Condensing
EMC European Union Directive 89/336/EEC EN61326
Safety European Union Directive 73/23/EEC EN61010-1

1x4 1x8 1x16
250ms 315ms 450ms
450ms 500ms 630ms

300mA 300mA 300mA

114 mm [4.5 in]

272 mm [10.75 in]

32 mm [1.25 in ]

0 to 40 oC

-20 to 65

(2)

o

C

Referenced Switch Manufacturer Optical Specifications7:

Typ. Max. Units

Wavelength Range 780 to 1650 nm
Switch Life > 10 million cycles (min.)
Insertion Loss
Repeatability
Back Reflection (SM/MM)
Polarization Dependent Loss (PDL)
Crosstalk - -80 dB

3

5

4

6

0.6 1.2 dB

- +/-0.03 dB

-60 / -20 -55 / - dB

- 0.05 dB

NOTES:

1. Actuation time measured from system trigger. Reset/Open refers to Channel N to Reset time. Settle/Close refers to Reset to Channel N or

Channel N to Channel M time. Reset position is optically blocked.

1. At higher operating temperatures, a typical 0.1 dB and 0.3dB additive insertion loss for each channel should be expected for the strain relief

and bulkhead models respectively.

1. Measured at 23 ± 5 °C.

1. Based on standard 1m pigtail length.

1. Sequential repeatability for 100 cycles at constant temperature after warm up. (Difference in Insertion Loss).

1. Measured at 1550 nm.

1. All optical specifications are referenced without connectors and are guaranteed by switch manufacturer only. Connectorization data will be

provided for Insertion Loss and Back Reflection for each channel per switch card.

Specifications are subject to change without notice.

HW 12/06/01

Rev. C

Model 7090 Switch Properites

Configuration Single Channel, 1xN non-blocking switch

Model Number

7090-4-1 1x4 Single-Mode fiber (SMF-28) 9/125 each ch. 1290-1650 FC/APC 1 meter

7090-4-2BH

Channels

(8)

1x4 Single-Mode fiber (SMF-28) 9/125 each ch. 1290-1650 FC/SPC Bulkhead Connector
7090-8-3 1x8 Single-Mode fiber (SMF-28) 9/125 each ch. 1290-1650 FC/APC 1 meter
7090-8-4 1x8 Multi-Mode fiber (MMF) 62.5/125 each ch. 780-1350 FC/SPC 1 meter
7090-8-5 1x8 Single Mode fiber (SMF-28) 9/125 each ch. 1290-1650 FC/SPC 1 meter
7090-16-6 1x16 Single Mode fiber (SMF-28) 9/125 each ch. 1290-1650 FC/SPC 1 meter
7090-16-7 1x16 Single Mode fiber (SMF-28) 9/125 each ch. 1290-1650 FC/APC 1 meter

NOTE:

1. This model contains a back plate with 5 FC/PC mating sleeve adapters. The fiber length is not applicable compared with the other models

that are fiber pigtailed. Additional insertion loss due to the mating sleeve adapter is not accounted for in the referenced switch specification.

# of

Fiber

Type

Wavelength

(nm) Connector FiberLength

HW 12/06/01

Rev. C

T able of Contents

1 General Information

Introduction ................................................................................ 1-2

Feature overview ........................................................................ 1-2

Warranty information ................................................................. 1-2

Manual addenda ......................................................................... 1-2

Safety symbols and terms .......................................................... 1-3

Specifications ............................................................................. 1-3

Unpacking and inspection .......................................................... 1-3

Inspection for damage ......................................................... 1-3

Handling precautions .......................................................... 1-3

Shipment contents ............................................................... 1-4

Instruction manual .............................................................. 1-4

Repacking for shipment ...................................................... 1-4

Switch properties ........................................................................ 1-4

2 Installation and Connections

Introduction ................................................................................ 2-2

Handling and cleaning precautions ............................................ 2-2

Handling fiber-optic cables ................................................. 2-2

Storing optical connectors ................................................... 2-3

Cleaning optical connectors ................................................ 2-3

Card configuration ...................................................................... 2-4

Card layouts ........................................................................ 2-4

Switching conventions ........................................................ 2-6

Switching diagram .............................................................. 2-7

Card installation and removal .................................................... 2-8

Card installation .................................................................. 2-8

Card removal ....................................................................... 2-9

Card connections ...................................................................... 2-10

Mating optical connectors ................................................. 2-10

Bulkhead version connectors ............................................ 2-10

3 Operation

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

Optical signal characteristics........................................................3-2

Operation overview .................................................................... 3-2

Card programming ..................................................................... 3-3

Front panel card programming ............................................ 3-4

Remote card programming ................................................. 3-6

Error conditions .......................................................................... 3-8

4 Service Information

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

Handling and cleaning precautions ............................................ 4-2

Handling fiber-optic cables ................................................. 4-2

Storing optical connectors ................................................... 4-3

Cleaning optical connectors ................................................ 4-3

Performance verification ............................................................. 4-3

Environmental conditions .................................................... 4-3

Insertion loss tests (an example) ......................................... 4-4

Principles of operation ................................................................ 4-7

Block diagram ..................................................................... 4-7

Power supplies ..................................................................... 4-7

List of Illustrations

2 Installation and Connections

Figure 2-1 Card configuration for versions with attached fiber cables .... 2-4

Figure 2-2 Typical card configuration for bulkhead versions................... 2-5

Figure 2-3 Functional diagram ................................................................ 2-7

Figure 2-4 Card installation ..................................................................... 2-9

4 Service Information

Figure 4-1 Optical insertion loss test connection block diagram ............ 4-5

Figure 4-2 Block diagram ........................................................................ 4-7

List of T ables

3 Operation

Table 3-1 Error conditions ..................................................................... 3-8

1

General Information