Tektronix MB Series Signal Conditioning Module Users Guide

MB Series

User’s Guide

A GREATER MEASURE OF CONFIDENCE

WARRANTY

Hardware

Keithley Instruments, Inc. warrants that, for a period of one (1) year from the date of shipment (3 years for Models 2000, 2001, 2002, 2010 and 2700), the
Keithley Hardware product will be free from defects in materials or workmanship. This warranty will be honored provided the defect has not been caused
by use of the Keithley Hardware not in accordance with the instructions for the product. This warranty shall be null and void upon: (1) any modification of
Keithley Hardware that is made by other than Keithley and not approved in writing by Keithley or (2) operation of the Keithley Hardware outside of the
environmental specifications therefore.

Upon receiving notification of a defect in the Keithley Hardware during the warranty period, Keithley will, at its option, either repair or replace such Keithley Hard­ware. During the first ninety days of the warranty period, Keithley will, at its option, supply the necessary on site labor to return the product to the condition prior to
the notification of a defect. Failure to notify Keithley of a defect during the warranty shall relieve Keithley of its obligations and liabilities under this warranty.

Other Hardware

The portion of the product that is not manufactured by Keithley (Other Hardware) shall not be covered by this warranty, and Keithley shall have no duty of
obligation to enforce any manufacturers' warranties on behalf of the customer. On those other manufacturers’ products that Keithley purchases for resale,
Keithley shall have no duty of obligation to enforce any manufacturers’ warranties on behalf of the customer.

Software

Keithley warrants that for a period of one (1) year from date of shipment, the Keithley produced portion of the software or firmware (Keithley Software) will
conform in all material respects with the published specifications provided such Keithley Software is used on the product for which it is intended and other­wise in accordance with the instructions therefore. Keithley does not warrant that operation of the Keithley Software will be uninterrupted or error-free and/
or that the Keithley Software will be adequate for the customer's intended application and/or use. This warranty shall be null and void upon any modification
of the Keithley Software that is made by other than Keithley and not approved in writing by Keithley.

If Keithley receives notification of a Keithley Software nonconformity that is covered by this warranty during the warranty period, Keithley will review the
conditions described in such notice. Such notice must state the published specification(s) to which the Keithley Software fails to conform and the manner
in which the Keithley Software fails to conform to such published specification(s) with sufficient specificity to permit Keithley to correct such nonconfor­mity. If Keithley determines that the Keithley Software does not conform with the published specifications, Keithley will, at its option, provide either the
programming services necessary to correct such nonconformity or develop a program change to bypass such nonconformity in the Keithley Software.
Failure to notify Keithley of a nonconformity during the warranty shall relieve Keithley of its obligations and liabilities under this warranty.

Other Software

OEM software that is not produced by Keithley (Other Software) shall not be covered by this warranty, and Keithley shall have no duty or obligation to
enforce any OEM's warranties on behalf of the customer.

Other Items

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

Items not Covered under Warranty

This warranty does not apply to fuses, non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow
instructions.

Limitation of Warranty

This warranty does not apply to defects resulting from product modification made by Purchaser without Keithley's express written consent, or by misuse
of any product or part.

Disclaimer of Warranties

EXCEPT FOR THE EXPRESS WARRANTIES ABOVE KEITHLEY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUD­ING WITHOUT LIMITATION, ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. KEI­THLEY DISCLAIMS ALL WARRANTIES WITH RESPECT TO THE OTHER HARDWARE AND OTHER SOFTWARE.

Limitation of Liability

KEITHLEY INSTRUMENTS SHALL IN NO EVENT, REGARDLESS OF CAUSE, ASSUME RESPONSIBILITY FOR OR BE LIABLE FOR: (1)
ECONOMICAL, INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, PUNITIVE OR EXEMPLARY DAMAGES, WHETHER CLAIMED
UNDER CONTRACT, TORT OR ANY OTHER LEGAL THEORY, (2) LOSS OF OR DAMAGE TO THE CUSTOMER'S DATA OR PROGRAM­MING, OR (3) PENALTIES OR PENALTY CLAUSES OF ANY DESCRIPTION OR INDEMNIFICATION OF THE CUSTOMER OR OTHERS FOR
COSTS, DAMAGES, OR EXPENSES RELATED TO THE GOODS OR SERVICES PROVIDED UNDER THIS WARRANTY.

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

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

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

CHINA: Yuan 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 • Fax: [phone]
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]
JAPAN: New Pier Takeshiba North Tower 13F • 11-1, Kaigan 1-chome • Minato-ku, Tokyo 105-0022 • 81-3-5733-7555 • Fax: [phone]
KOREA: 2FL., URI Building • 2-14 Yangjae-Dong • Seocho-Gu, Seoul 137-888 • 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 • Fax: [phone]
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]

4/02

MB Series

User’s Guide

Revision D - January 1996

Part Number: 60530

New Contact Information

Keithley Instruments, Inc.

28775 Aurora Road

Cleveland, OH 44139

Technical Support: 1-888-KEITHLEY

Monday – Friday 8:00 a.m. to 5:00 p.m (EST)

Fax: [phone]

Visit our website at http://www.keithley.com

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 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 is the individual or group responsible for the use

and maintenance of equipment, for ensuring that the equipment is
operated within its specifications and operating limits, and for en­suring that operators are adequately trained.

Operators use the product for its intended function. They must be

trained in electrical safety procedures and proper use of the instru­ment. They must be protected from electric shock and contact with
hazardous live circuits.

Maintenance personnel perform routine procedures on the product

to keep it operating properly, for example, setting the line voltage
or replacing consumable materials. Maintenance procedures are de­scribed in the manual. The procedures explicitly state if the operator
may perform them. Otherwise, they should be performed only by
service personnel.

Service personnel are trained to work on live circuits, and perform

safe installations and repairs of products. Only properly trained ser­vice personnel may perform installation and service procedures.

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

Exercise extreme caution when a shock hazard is present. Lethal
voltage may be present on cable connector jacks or test fixtures. The
American National Standards Institute (ANSI) states that a shock
hazard exists when voltage levels greater than 30V RMS, 42.4V
peak, or 60VDC are present. A good safety practice is to expect

that hazardous voltage is present in any unknown 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, no conductive part of

the circuit may be exposed.

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

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

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

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

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

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.

5/02

If or is present, connect it to safety earth ground using the
wire recommended in the user documentation.

!

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

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

The WARNING heading in a manual explains dangers that might
result in personal injury or death. Always read the associated infor­mation very carefully before performing the indicated procedure.

The CAUTION heading in a manual explains hazards that could
damage the instrument. Such damage may invalidate the warranty.

Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and

all test cables.

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

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

The information contained in this manual is believed to be accurate and reliable. However, Keithley
Instruments, Inc., assumes no responsibility for its use or for any infringements or patents or other rights
of third parties that may result from its use. No license is granted by implication or otherwise under any
patent rights of Keithley Instruments, Inc.

KEITHLEY INSTRUMENTS, INC., SHALL NO T BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES RELATED TO THE USE OF THIS PRODUCT. THIS
PRODUCT IS NOT DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY
SUITABLE FOR USE IN LIFE SUPPORT OR CRITICAL APPLICATIONS.

Refer to your Keithley Instruments license agreement for specific warranty and liability information.

All brand and product names are trademarks or registered trademarks of their respective companies.

© Copyright Keithley Instruments, Inc., 1993, 1996.

All rights reserved. Reproduction or adaptation of any part of this documentation beyond that permitted
by Section 117 of the 1976 United States Copyright Act without permission of the Copyright owner is
unlawful.

Keithley MetraByte

440 Myles Standish Blvd. Taunton, MA 02780

FAX: [phone]

Telephone: [phone]

●

Table of Contents

Preface

Manual Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi

Repair and Return Policy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi

Introduction

1

MB Series Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

MBAF Series Active Low-Pass Filter Modules. . . . . . . . . . . . . .1-6

MB Series Backplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

2

Setting Up an MB Series System

Installing the MB Series Backplane. . . . . . . . . . . . . . . . . . . . . . .2-2

Selecting a Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

Mounting the Backplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

Mounting: MB01, MB02, and MB05. . . . . . . . . . . . . . . . .2-2

Mounting: MB03 and MB04 . . . . . . . . . . . . . . . . . . . . . . .2-3

Mounting: STA-1360 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Mounting: STA-MB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Connecting Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Power: MB01. MB02, and MB05 . . . . . . . . . . . . . . . . . . .2-5

Power: MB03, MB04, and STA-1360 . . . . . . . . . . . . . . . .2-6

Power: STA-MB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7

Using an Auxiliary Power Supply . . . . . . . . . . . . . . . . .2-7

Using DAS Board Power. . . . . . . . . . . . . . . . . . . . . . . .2-8

Grounding the Backplane (MB01, MB02, and MB05). . . . .2-10

Installing MB Series Modules in the Backplane . . . . . . . . . . . .2-11

Connecting Signals to the Backplane. . . . . . . . . . . . . . . . . . . . .2-12

Physical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

Wiring Specific Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13

Current Conversion Resistor. . . . . . . . . . . . . . . . . . . . . . . . .2-17

iii

Connecting Backplanes to Keithley MetraByte

Analog I/O Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18

Configuring for Single-Ended Operation . . . . . . . . . . . . . . .2-18

Connecting MB01 and MB05 Backplanes . . . . . . . . . . . . . .2-18

Connecting the MB01/MB05 to the DAS4, DAS-8, and

DAS-800 Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-19

Connecting the MB01/MB05 to the DAS-16, DAS-1200,

DAS-1400, and DAS-1600 Series. . . . . . . . . . . . . . . . .2-20

Connecting the MB01/MB05 to the DAS-1800 Series . .2-21
Connecting the MB01/MB05 to the DASCard-1000

Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-22

Connecting the MB01/MB05 to the DAS-20. . . . . . . . . .2-23

Connecting MB02 Backplanes . . . . . . . . . . . . . . . . . . . . . . .2-24

Connecting the MB02 to the DAS4, DAS-8, and

DAS-800 Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25

Connecting the MB02 to the DAS-16, DAS-1200,

DAS-1400, and DAS-1600 Series. . . . . . . . . . . . . . . . .2-27

Connecting the MB02 to the DAS-1800 Series. . . . . . . .2-29

Connecting the MB02 to the DAS-20 . . . . . . . . . . . . . . .2-31

Connecting MB03, MB04, and STA-1360 Backplanes . . . .2-35

Connecting STA-MB Backplanes . . . . . . . . . . . . . . . . . . . . .2-35

Wiring Module Inputs and Outputs to the DAS Board . .2-35

Setting STA-MB Single-Ended/Differential Switches. . .2-37

Cabling to the STA-MB . . . . . . . . . . . . . . . . . . . . . . . . . .2-37

MB Series Module Descriptions

3

MB30 and MB31 Millivolt and Voltage Input Modules . . . . . . .3-2

MB32 Current Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7

MB34 RTD Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11

MB36 Potentiometer Input Module. . . . . . . . . . . . . . . . . . . . . .3-16

MB37 Thermocouple Input Module . . . . . . . . . . . . . . . . . . . . .3-20

MB38 Strain Gauge Input Module. . . . . . . . . . . . . . . . . . . . . . .3-25

MB39 Current Output Module. . . . . . . . . . . . . . . . . . . . . . . . . .3-29

MB40 and MB41 Wide Bandwidth Millivolt/Volt Input

Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34

MB45 Frequency Input Module. . . . . . . . . . . . . . . . . . . . . . . . .3-39

MB47 Linearized Thermocouple Input Module . . . . . . . . . . . .3-43

MBAF Series Low-Pass Active Filter Modules. . . . . . . . . . . . .3-48

iv

v

MB Series Backplane Descriptions

4

MB01, MB02, and MB05 Backplanes. . . . . . . . . . . . . . . . . . . . .4-1

System Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

MB01 and MB05 System Connectors . . . . . . . . . . . . . . . .4-4

MB02 System Connector. . . . . . . . . . . . . . . . . . . . . . . . . .4-6

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

Field Terminations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

Interchannel Bridge Jumpers (MB01 and MB05 Only) . . . . .4-9

Address Selection Jumpers (MB02 Only). . . . . . . . . . . . . . . .4-9

Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10

Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10

RMT-MBBP Rack Enclosure. . . . . . . . . . . . . . . . . . . . . .4-12

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-13

MB03 and MB04 Backplanes . . . . . . . . . . . . . . . . . . . . . . . . . .4-14

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Field Terminations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17

STA-1360 Evaluation Socket. . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

Field Terminations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . .4-20

Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-21

STA-MB Backplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-21

Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-23

Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-23

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-23

Index

List of Figures

Figure 1-1. MB Series Module Outline and Pinout. . . . . . . . .1-3

Figure 1-2. Block Diagram of a General Measurement and

Control Application. . . . . . . . . . . . . . . . . . . . . . . .1-9

Figure 2-1. Mounting the Backplane in the Rack-Mount

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

Figure 2-2. Power Terminal Block Locations: MB01, MB02,

and MB05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

Figure 2-3. Wiring the Power Supply to the Backplane . . . . .2-6

Figure 2-4. Power Terminal Block Locations: MB03,

MB04, STA-1360 . . . . . . . . . . . . . . . . . . . . . . . . .2-6

Figure 2-5. Power Terminal Block Location: STA-MB . . . . .2-7

Figure 2-6. Wiring Power to the STA-MB from a

DAS-1600 Series Board . . . . . . . . . . . . . . . . . . . .2-9

Figure 2-7. Ground Stud Locations . . . . . . . . . . . . . . . . . . . .2-10

Figure 2-8. Mounting an MB Series Module. . . . . . . . . . . . .2-11

Figure 2-9. Connecting Signal Wires. . . . . . . . . . . . . . . . . . .2-12

Figure 2-10. Installing the Current Conversion Resistor

(MB01, MB02, MB03, MB05, STA-1360,

STA-MB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17

Figure 2-11. Typical MB01 or MB05 Application . . . . . . . . .2-18

Figure 2-12. Location of Pin 1 on MB01 or MB05

Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-19

Figure 2-13. Connecting the DAS-4, DAS-8, or DAS-800

Series to the MB01/MB05 . . . . . . . . . . . . . . . . .2-20

Figure 2-14. Connecting the DAS-16, DAS-1200, DAS-1400,

or DAS-1600 Series to the MB01/MB05 . . . . . .2-20

Figure 2-15. Connecting the DAS-1800ST/HR/AO Series

to the MB01/MB05 using an STA-1800U . . . . .2-21

Figure 2-16. Connecting the DAS-1800HC Series to the

MB01/MB05 using the STA-1800HC or

CONN-1800HC. . . . . . . . . . . . . . . . . . . . . . . . . .2-22

Figure 2-17. Connecting the DASCard-1000 Series to the

MB01/MB05 using an STA-U . . . . . . . . . . . . . .2-23

Figure 2-18. Connecting the DAS-20 to the MB01/MB05 . . .2-23

Figure 2-19. Typical MB02 Application . . . . . . . . . . . . . . . . .2-24

Figure 2-20. Location of Pin 1 on the MB02 Connector. . . . .2-25

Figure 2-21. Connecting the DAS-4, DAS-8, or DAS-800

Series to the MB02 . . . . . . . . . . . . . . . . . . . . . . .2-26

Figure 2-22. Connecting the DAS-4, DAS-8, or DAS-800

Series to the MB02 using the STA-SCM8 . . . . .2-26

Figure 2-23. Connecting the DAS-16 or DAS-1200/1400/

1600 Series to the MB02. . . . . . . . . . . . . . . . . . .2-28

Figure 2-24. Connecting the DAS-16 or DAS-1200/1400/

1600 Series to the MB02 using the

STA-SCM16 . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-28

Figure 2-25. Connecting the DAS-1800ST/HR/AO Series

to the MB02 using an STA-1800U . . . . . . . . . . .2-29

Figure 2-26. Daisy-Chaining STA-1800U Accessories

with MB02 Backplanes. . . . . . . . . . . . . . . . . . . .2-30

vi

Figure 2-27. Connecting the DAS-20 to the MB02. . . . . . . . .2-31

Figure 2-28. MB02 Address Jumper Locations. . . . . . . . . . . .2-32

Figure 2-29. MB02 Address Jumper Example . . . . . . . . . . . .2-34

Figure 2-30. STA-MB/DAS-1600 Series Wiring Example. . .2-36
Figure 2-31. STA-MB Single-Ended/Differential Switches . .2-37
Figure 2-32. Connecting the DAS-800 Series to the

STA-MB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-38

Figure 2-33. Connecting the DAS-8 to the STA-MB

using an EXP-16 . . . . . . . . . . . . . . . . . . . . . . . . .2-38

Figure 2-34. Connecting the DAS-800 Series to the

STA-MB using an EXP-800 . . . . . . . . . . . . . . . .2-38

Figure 2-35. Connecting the DAS-1200/1400/1600 or

DASCard-1000 Series to the STA-MB using

an EXP-1600. . . . . . . . . . . . . . . . . . . . . . . . . . . .2-39

Figure 3-1. MB30 and MB31 Functional Block Diagram. . . .3-3

Figure 3-2. MB32 Functional Block Diagram. . . . . . . . . . . . .3-8

Figure 3-3. MB34 Functional Block Diagram. . . . . . . . . . . .3-12

Figure 3-4. MB36 Functional Block Diagram. . . . . . . . . . . .3-17

Figure 3-5. MB37 Functional Block Diagram. . . . . . . . . . . .3-22

Figure 3-6. MB38 Functional Block Diagram. . . . . . . . . . . .3-26

Figure 3-7. MB39 Functional Block Diagram. . . . . . . . . . . .3-31

Figure 3-8. MB40 and MB41 Functional Block Diagram. . .3-35

Figure 3-9. MB45 Functional Block Diagram. . . . . . . . . . . .3-40

Figure 3-10. MB47 Functional Block Diagram. . . . . . . . . . . .3-45

Figure 3-11. 9-Pole Low-Pass Theoretical Frequency

Response Curves. . . . . . . . . . . . . . . . . . . . . . . . .3-51

Figure 3-12. 9-Pole Low-Pass Theoretical Delay Curves . . . .3-52

Figure 3-13. 9-Pole Low-Pass Theoretical Step Response

Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-53

Figure 4-1. MB01 Backplane Diagram . . . . . . . . . . . . . . . . . .4-2

Figure 4-2. MB02 Backplane Diagram . . . . . . . . . . . . . . . . . .4-3

Figure 4-3. MB05 Backplane Diagram . . . . . . . . . . . . . . . . . .4-4

Figure 4-4. MB01/MB05 System Connector Pinout

(P1 and P2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

Figure 4-5. MB02 System Connector Pinout (P1). . . . . . . . . .4-6

Figure 4-6. Address Selection Pins Showing Default

Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10

Figure 4-7. MB01 and MB02 Backplane Mounting

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-11

Figure 4-8. MB05 Backplane Mounting Dimensions . . . . . .4-11

Figure 4-9. RMT-MBBP Rack Mount Diagram . . . . . . . . . .4-12

Figure 4-10. RMT-MBBP Rack Mount Assembly Drawing. .4-13

vii

Figure 4-11. MB03 Wiring Diagram . . . . . . . . . . . . . . . . . . . .4-14

Figure 4-12. MB04 Wiring Diagram . . . . . . . . . . . . . . . . . . . .4-15

Figure 4-13. STA-1360 Backplane Diagram. . . . . . . . . . . . . .4-18

Figure 4-14. STA-MB Backplane Diagram. . . . . . . . . . . . . . .4-22

Figure 4-15. STA-MB/DAS-1600 Series Wiring Example. . .4-24

List of Tables

Table 1-1. MB Series Input Modules . . . . . . . . . . . . . . . . . . .1-5

Table 1-2. MBAF Series Module Pinout . . . . . . . . . . . . . . . .1-7

Table 1-3. MB Series Backplanes. . . . . . . . . . . . . . . . . . . . . .1-8

Table 2-1. MB Series Module Power Requirements. . . . . . . .2-4

Table 2-2. MB Series Input Module Wiring Diagrams:

MB01, MB02, MB03, MB04, MB05,

STA-1360. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13

Table 2-3. MB Series Input Module Wiring Diagrams:

STA-MB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15

Table 2-4. MB Series Output Module Wiring Diagram:

MB01, MB02, MB03, MB04, MB05,

STA-1360. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16

Table 2-5. MB Series Output Module Wiring Diagram:

STA-MB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17

Table 2-6. MB02 Address Selection Jumpers. . . . . . . . . . . .2-33

Table 3-1. MB30 and MB31 Specifications . . . . . . . . . . . . . .3-4

Table 3-2. MB30 and MB31 Ordering Information . . . . . . . .3-6

Table 3-3. MB32 Specifications . . . . . . . . . . . . . . . . . . . . . . .3-9

Table 3-4. MB32 Ordering Information . . . . . . . . . . . . . . . .3-10

Table 3-5. MB34 Specifications . . . . . . . . . . . . . . . . . . . . . .3-13

Table 3-6. MB34 Ordering Information . . . . . . . . . . . . . . . .3-15

Table 3-7. MB36 Specifications . . . . . . . . . . . . . . . . . . . . . .3-18

Table 3-8. MB36 Ordering Information . . . . . . . . . . . . . . . .3-20

Table 3-9. MB37 Specifications . . . . . . . . . . . . . . . . . . . . . .3-23

Table 3-10. MB37 Ordering Information . . . . . . . . . . . . . . . .3-25

Table 3-11. MB38 Specifications . . . . . . . . . . . . . . . . . . . . . .3-27

Table 3-12. MB38 Ordering Information . . . . . . . . . . . . . . . .3-29

Table 3-13. MB39 Specifications . . . . . . . . . . . . . . . . . . . . . .3-32

Table 3-14. MB39 Ordering Information . . . . . . . . . . . . . . . .3-33

Table 3-15. MB40 and MB41 Specifications . . . . . . . . . . . . .3-36

Table 3-16. MB40 and MB41 Ordering Information . . . . . . .3-38

Table 3-17. MB45 Specifications . . . . . . . . . . . . . . . . . . . . . .3-41

Table 3-18. MB45 Ordering Information . . . . . . . . . . . . . . . .3-43

Table 3-19. MB47 Specifications . . . . . . . . . . . . . . . . . . . . . .3-46

Table 3-20. MB47 Ordering Information . . . . . . . . . . . . . . . .3-48

viii

Table 3-21. MBAF Series Module Specifications . . . . . . . . .3-49

Table 3-22. MBAF-LPBU Butterworth (9-Pole) Low-Pass

Theoretical Response Data . . . . . . . . . . . . . . . . .3-54

Table 3-23. MBAF-LPBU Bessel (9-Pole) Low-Pass

Theoretical Response Data . . . . . . . . . . . . . . . . .3-55

Table 3-24. MBAF Series Model Numbers . . . . . . . . . . . . . .3-56

Table 4-1. MB02 Address Selection Jumpers. . . . . . . . . . . .4-10

Table 4-2. MB01, MB02, and MB05 Backplane

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . .4-13

Table 4-3. MB03 and MB04 Mounting Parts . . . . . . . . . . . .4-17

Table 4-4. MB03 and MB04 Mounting Parts for Two

or More Backplanes. . . . . . . . . . . . . . . . . . . . . . .4-17

Table 4-5. MB03 and MB04 Specifications . . . . . . . . . . . . .4-17

Table 4-6. STA-1360 Mounting Parts. . . . . . . . . . . . . . . . . .4-21

ix

Preface

This manual serves both designers of systems and users of Keithley
MetraByte MB Series signal conditioning modules, backplanes, and
accessories. It provides specifications, ordering information, and
installation and application instructions.

Manual Organization

This manual is organized as follows:

●

Chapter 1 - Introduction provides an overview of MB Series

modules (including MBAF Series modules), MB Series backplanes,
and applications.

●

Chapter 2 - Setting up an MB Series System tells how to install an

MB Series backplane in an equipment rack, install MB Series
modules in the backplane, wire signals to the modules, and connect
Keithley MetraByte analog boards to the backplane.

Chapter 3 - MB Series Module Descriptions provides detailed

●

descriptions and specifications for each of the MB Series modules.

●

Chapter 4 - MB Series Backplane Descriptions provides detailed

descriptions and specifications for each of the MB Series backplanes.

Repair and Return Policy

If you have a problem with this product or its accessories, determine your
original invoice number and purchase date and prepare a brief description
of the problem. For technical support, call [phone] between 8:00
AM and 6:00 PM EST, Monday through Friday.

xi

If an Applications Engineer determines that the product must be returned
for repair, you will be gi ven an RMA number and additional instructions.
To return the product, do the following:

1. Pack the product in its original packing materials or suitable
replacements. Include a piece of paper with the following
information:

– your name, address, and telephone number
– original invoice number and purchase date
– brief description of the problem
– RMA number

2. Write the RMA # on the outside of the package.

3. Ship to:

Keithley MetraByte
440 Myles Standish Blvd.
Taunton, MA 02780
ATTN: RMA (your RMA number)

xii

1

Introduction

This chapter describes general features and applications of MB Series
signal conditioning modules and backplanes. It includes the following
sections:

●

MB Series modules
MBAF Series active low-pass filter modules

●

MB Series backplanes

●

●

Applications

MB Series Modules

This section describes characteristics that apply to all MB Series
modules.

Performance

The MB Series provides excellent signal-conditioning performance. Each
unit is laser-trimmed for high calibrated accuracy. Typical calibrated
accuracy consists of ±0.05% span ±10 µV RTI ±0.05 V
Reference to Input; V
Refer to the specific module description in this chapter for more detailed
information.

(RTI stands for

z

is the input voltage that results in a 0 V output).

z

MB Series Modules 1-1

Protection

Chopper-stabilized amplification provides low drift and outstanding long
term stability without the need for potentiometer adjustments. 1500 V

rms

transformer isolation for the signal and power sections eliminates ground
loops, guards against transients, prevents common mode voltage
problems, and ensures channel-to-channel isolation. 160 dB CMR
(Common Mode Rejection), 90 dB NMR (Normal Mode Rejection), and
RFI/EMI immunity maintain signal integrity.

All field-wired terminations, including sensor inputs, excitation circuitry,
and current outputs, are protected against the inadvertent application of
240 V

line voltage. The MB Series modules meet the IEEE standard

rms

for transient voltage protection (IEEE-STD 472 (SWC)).

Physical Characteristics

All MB Series modules are identical in pinout and size as shown in Figure
1-1. Therefore, you can mix and match them on a backplane to address
your exact needs. The modules are hard-potted, typically weigh 2.25
ounces (64 grams), and have sturdy 40-mil gold plated pins. The module
cases are made from a thermoplastic resin that has a fire retardant rating
of 94 V-O and is designed for use from –55°C to +85°C. The modules are
secured in the backplane by a tapered screw that also serves as a guide for
insertion.

For ready identification, the isolated input modules are labeled with white
lettering on a black background and the isolated output modules are
labeled with white letters on a red background.

1-2 Introduction

0.345

0.0750

(8.8)

(1.8)

typ

2.250

(57.2)

0.590
(15.0)

0.150
(3.8)

0.375 (9.2)

0.525 (12.9)

0.375
(9.5)

1.175

(29.8)

1.650
(41.9)

dimensions in inches and (mm)

2.250
(57.2)

0.245 (6.2)

0.145 (3.7)

0.095 (2.4)

WRITE EN (0) 23

0.475 (11.6)

RESERVED 21

I/O COM 19

+5 V 17

IN LO 5

- EXC 3

SENSOR - 1

0.275 (6.7)

0.375 (9.5)

socket

for 0.038

pin

PINOUT

1

TOP

READ EN (0) 22
Vout20
Vin18
POWER COM16

IN HI6
+ EXC4
SENSOR +2

insert

for 3mm

screw

2

0.590
(15.0)

2.250
(57.2)

Figure 1-1. MB Series Module Outline and Pinout

MB Series Modules 1-3

Input Modules

MB Series input modules offer the following features:

Signal source inputs:

●

– Sensors: thermocouples, RTDs, potentiometers, and strain gauges
– Millivolt and voltage sources
– 4-20 mA or 0-20 mA process current inputs
– frequency inputs
Mix-and-match input capability

●

●

High-level voltage output: –5 V to +5 V or 0 to +5 V

●

High accuracy: ±0.05%
Low drift: ±1 µV/°C

●

●

Reliable transformer isolation: 1500 V

CMV (Common Mode

rms

Voltage), 160 dB CMR, meets IEEE-STD 472: Transient Protection
(SWC)

●

Input protection: 240 V

●

Factory-ranged and trimmed

continuous

rms

The MB Series input modules are galvanically isolated, single channel,
plug-in signal conditioners that provide input protection, amplification
and filtering, as well as a high level, series-switched analog output that
can eliminate the need for external multiplexers. Key specifications
include: 1500 V

isolation, calibrated accuracy of ±0.05%, ±0.02% span

rms

nonlinearity, and low drift of ±1 µV/°C.

MB Series input modules are selected to meet the requirements of each
application. The transfer function provided by each module is as follows:

Input: specified sensor measurement range

●

Output: 0 to +5 V or –5 V to +5 V

●

Input modules are available to accept millivolt, volt, process current,
thermocouple, RTD, potentiometer, frequency, and strain gauge inputs.
Each module is available in a number of standard ranges to meet most
applications.

1-4 Introduction

Table 1-1 lists the available MB Series input modules.

Table 1-1. MB Series Input Modules

Module Function Output

MB30 Isolated mV Input 0 to +5 V or –5 V to +5 V
MB31 Isolated V Input 0 to +5 V or –5 V to +5 V
MB32 Isolated Current Input 0 to +5 V
MB34

Isolated 2, 3 or 4 Wire

100 Ω Pt, 10 Ω Cu, or 120 Ω Ni
MB36 Isolated Potentiometer Input 0 to +5 V
MB37 Isolated Thermocouple Input –

Type J, K, T, E, R, S, or B
MB38 Isolated Strain Gauge Input –

Full Bridge and Half Bridge
MB40 Isolated Wide Bandwidth mV Input 0 to +5 V or –5 V to +5 V
MB41 Isolated Wide Bandwidth V Input 0 to +5 V or –5 V to +5 V

1

RTD Input –

0 to +5 V

0 to +5 V

–5 V to +5 V

MB45 Isolated Frequency Input 0 to +5 V
MB47 Isolated Linearized Thermocouple Input –

0 to +5 V

Type J, K, T, E, R, S, or B

Notes

1

The MB34 RTD input module pro vides 3-wire lead resistance compensation and can be connected to

2, 3, or 4 wire RTDs.

For a more detailed description of the MB Series input modules, refer to
Chapter 3

.

Output Module

The MB Series output module (MB39) offers the following features:

High-level voltage inputs: 0 to +5 V or –5 V to +5 V

●

Process current output: 4-20 mA or 0-20 mA

●

●

High accuracy: ±0.05%

MB Series Modules 1-5

Reliable transformer isolation: 1500 V

●

Meets IEEE-STD 472: Transient Protection (SWC)

●

●

Output protection: 240 V
Internal track and hold amplifier

●

continuous

rms

CMV, CMR = 90 dB

rms

The MB39 current output module accepts a high level analog signal at its
input and provides a galvanically-isolated 4-20 mA or 0-20 mA process
current signal at its output. The module features high accuracy of ±0.05%,
±0.02% nonlinearity, and 1500 V

common mode voltage isolation

rms

protection. The transfer function provided by this module is as follows:

Input: 0 to +5 V or –5 V to +5 V

●

●

Output: 4-20 mA or 0-20 mA

For a more detailed description of the MB Series output modules, refer to
Chapter 3

.

MBAF Series Active Low-Pass Filter Modules

MBAF Series filters offer the following features:

●

MB Series plug-compatibility

●

+5 V power supply only
Differential input

●

●

Standard corner frequencies: 1 kHz, 2 kHz, 5 kHz, 10 kHz, 20 kHz,
50 kHz

Use MBAF Series filters for the following applications:

Prefiltering for anti-aliasing

●

Data acquisition

●

●

Industrial process control
Signal conditioning

●

1-6 Introduction

The MBAF Series are differential-input 9-pole Butterworth and Bessel
low-pass anti-aliasing filters that are pinout and package compatible with
industry-standard MB Series signal conditioning modules and mechanical
equivalents.

Table 1-2 shows the pinout for MBAF Series filters.

Table 1-2. MBAF Series Module Pinout

Pin Function Pin Function

1 N/A 4 N/A
2 N/A 5 IN LO
3 N/A 6 IN HI
16 POWER COM 20 Vout
17 +5V 21 N/A
18 N/A 22 N/A
19 I/O COM 23 N/A

For a more detailed description of the MBAF Series modules, refer to
Chapter 3

.

MBAF Series Active Low-Pass Filter Modules 1-7

MB Series Backplanes

Table 1-3 provides a brief summary the backplanes available for use with
MB Series modules.

Table 1-3. MB Series Backplanes

Model Description

MB01 Holds up to 16 modules and mounts in a 19-inch equipment rack.

Provides direct channel-to-channel connection to an analog board
making it suitable for high-speed, high-resolution applications.

MB02 Holds up to 16 modules and mounts in a 19-inch equipment rack. Up

to four MB02s can be multiplexed together, providing a total of 64

channels. This makes it suitable for larger systems.
MB03 DIN-rail compatible backplane that holds one module.
MB04 DIN-rail compatible backplane that holds two modules.
MB05 Holds up to eight modules and mounts in a 19-inch equipment rack.

Provides direct channel-to-channel connection to an analog board

making it suitable for high-speed, high-resolution applications.
STA-1360 Stand-alone test/evaluation socket for one module.
STA-MB Provides sockets for four modules.

For a more detailed description of the MB Series backplanes, refer to
Chapter 4

.

1-8 Introduction

Applications

Typical MB Series applications include mini- and microcomputer-based
measurement systems, standard data acquisition systems, programmable
controllers, analog recorders, and dedicated control systems. MB Series
modules are ideally suited to applications where monitoring and control
of temperature, pressure, flow, and other analog signals are required.
Figure 1-2 shows a block diagram of a general MB Series measurement
and control application.

mV , V, Thermocouple, RTD,

Potentiometer, Strain Gauge,

Frequency, 4–20 mA / 0–20 mA

Sensors,
Monitors

Process or
Equipment

Controls

(Valves, etc.)

4–20 mA / 0–20 mA

Input

Module

MB SERIES

MODULES

Output
Module

0 to +5 V / ±5 V

A/D

Analog I/O

D/A

0 to +5 V / ±5 V

Computer

Figure 1-2. Block Diagram of a General Measurement and Control Application

Applications 1-9

2

Setting Up an

MB Series System

This chapter tells how to set up an MB Series system consisting of a
backplane, signal conditioning modules, and an analog I/O board. It
discusses the MB01, MB02, MB03, MB04, MB05, STA-1360, and
STA-MB backplanes. This chapter includes the following sections:

●

Installing an MB Series backplane

●

Installing MB Series modules in the backplane
Connecting signals to the backplane

●

Connecting backplanes to Keithley MetraByte analog I/O boards

●

Caution:

discharge, wear a grounded wrist strap or similar device whenever
handling backplanes or modules.

To prevent damage to MB Series components due to static

2-1

Installing the MB Series Backplane

This section tells how to install each of the MB Series backplanes.

Selecting a Site

You can install the MB Series backplane and signal conditioning modules
in any location suitable for general-purpose electronic equipment. The
temperature in this location must be between –25°C and +85°C (–13°F
and +185°F) for rated performance. If the environment is harsh or
unfavorable, install the backplane in a protective enclosure.

Mounting the Backplane

The different backplane models have different mounting requirements.
Refer to the section below that describes mounting for your model.

Mounting: MB01, MB02, and MB05

The MB01, MB02, and MB05 backplanes mount in an RMT-MBBP
rack-mount enclosure, which in turn mounts in a 19-inch equipment rack.
The rack-mount enclosure has seven 3-mm threaded inserts for mounting
the backplane, six threaded inserts for mounting an adaptor board on the
back, and four holes for mounting a PWR-51A or PWR-55A power
supply on the back. The rack-mount enclosure kit includes screws.

Note:

The PWR-55A power supply has replaced the PWR-53A power

supply, which is now obsolete.

To install the MB01, MB02, or MB05 backplane, perform the following
steps:

1. Screw the backplane into the rack-mount enclosure as shown in
Figure 2-1.

2. Attach the rack-mount enclosure to the equipment rack.

2-2 Setting Up an MB Series System

MB01, MB02, or MB05

Backplane

Optional Power

Supply

Rack-mount

Enclosure

Figure 2-1. Mounting the Backplane in the Rack-Mount Enclosure

Mounting: MB03 and MB04

You can set up the MB03 and MB04 for DIN-rail mounting using special
mounting hardware. Refer to Chapter 4 for ordering information.

Mounting: STA-1360

The STA-1360 ships with standoffs for bench top use. You can also set up
the STA-1360 backplane for DIN-rail mounting using special mounting
hardware. Refer to Chapter 4 for ordering information.

Mounting: STA-MB

The STA-MB is factory-mounted in a free-standing plastic enclosure.

Installing the MB Series Backplane 2-3

Connecting Power

MB Series backplanes require external +5 V power. Before selecting a
power supply, determine the total backplane current requirement. To do
this, add the current requirements for the MB Series modules you plan to
install in the backplane. T able 2-1 sho ws the current requirements for MB
Series modules.

Table 2-1. MB Series Module Power Requirements

Model Current Model Current

MB30 30 mA MB38 200 mA
MB31 30 mA MB39

MB32 30 mA MB40 30 mA
MB34 30 mA MB41 30 mA
MB36 30 mA MB45 110 mA
MB37 30 mA MB47 30 mA

Notes

1

Maximum output load resistance is 750 Ω

170 mA

1

Keithley of fers two +5 V external supplies that mount directly to the back
of the RMT-MBBP rack-mount enclosure: the PWR-51A, which delivers
up to 1 A, and the PWR-55A, which delivers up to 5 A.

Refer to the section below that describes power connection for your
backplane model.

2-4 Setting Up an MB Series System

Power: MB01. MB02, and MB05

To connect power to the MB01, MB02, or MB05 backplane, perform the
following steps:

1. Mount the power supply in its permanent location.
If you are using the PWR-51A or PWR-55A, attach the power supply

directly to the back of the rack-mount enclosure as shown in Figure
2-1.

2. Find the power terminal block on the backplane as shown in Figure
2-2.

MB02

Power T erminal

Block

MB01

Power T erminal

Block

MB05

Figure 2-2. Power Terminal Block Locations: MB01, MB02, and MB05

3. Using #12 to #16 AWG wire, connect the power supply to the
backplane as shown in Figure 2-3. The terminals are labeled on the
board as +5 V and PWR COM.

Installing the MB Series Backplane 2-5

To + 5 V

Figure 2-3. Wiring the Power Supply to the Backplane

Power: MB03, MB04, and STA-1360

Caution:

against reversed polarity. Reversing the power supply wiring to these
backplanes can destroy any installed modules.

To connect power to the MB03, MB04, or ST A-1360 backplane, perform
the following steps:

The MB03, MB04, and STA-1360 do not have protection

Power Terminal
Block

To power common

or ground

1. Mount the power supply in its permanent location.

2. Find the power terminal block on the backplane as shown in Figure
2-4.

Power T erminal

Block

MB03 MB04 ST A-1360

Figure 2-4. Power Terminal Block Locations: MB03, MB04, STA-1360

2-6 Setting Up an MB Series System

Power: STA-MB

3. Using #18 to #22 AWG wire, connect the power supply to the
backplane as shown in Figure 2-3. The terminals are labeled on the
board as +5 V and PWR COM.

You can use power either from the DAS board connection or an auxiliary
power supply. Refer to the section below for the method you choose.

Caution:

The STA-MB does not have protection against reversed
polarity . Re v ersing the po wer supply wiring to this backplane can destroy
any installed modules.

Using an Auxiliary Power Supply

T o connect an auxiliary po wer supply to the STA-MB backplane, perform
the following steps:

1. Mount the power supply in its permanent location.

2. Find the power terminal block on the backplane as shown in Figure

2-5.

Power Terminal
Block

Figure 2-5. Power Terminal Block Location: STA-MB

Installing the MB Series Backplane 2-7

3. Using #18 to #22 AWG wire, connect the power supply to the

STA-MB power terminal block as shown in Figure 2-3. The power
terminal block screw terminals are labeled on the backplane as +5 V
and GND.

Using DAS Board Power

When you cable a DAS board to an STA-MB backplane, the DAS board
delivers +5 V to a pair of screw terminals on the STA-MB. To use this
power on the STA-MB, perform the following steps:

1. Refer to the DAS board’s I/O connector pinout to determine which

pins provide +5 V and POWER GROUND. For example, on the
DAS-1600 I/O connector, pin 1 provides +5 V and pin 7 provides
POWER GROUND.

2. On the STA-MB, find the screw terminals with the same numbers.

These provide +5 V and POWER GROUND from the DAS board.

3. Find the power terminal block on the STA-MB backplane as shown in

Figure 2-5.

4. Using #18 to #22 AWG wire, connect the screw terminals you located

in step 2 to the STA-MB power terminal block. Figure 2-3 shows
how. The power terminal block screw terminals are labeled on the
backplane as +5 V and GND.

Figure 2-6 shows an STA-MB backplane wired to use power from a
DAS-1600 Series board.

2-8 Setting Up an MB Series System

GND

+5 V

Power T erminal Block

DAS-1600 Series

+5 V (pin 1) and PWR

GND (pin 7) wired to

the STA-MB power

terminal block

Figure 2-6. Wiring Power to the STA-MB from a DAS-1600 Series Board

1

7

To DAS board

Installing the MB Series Backplane 2-9

Grounding the Backplane (MB01, MB02, and MB05)

MB Series modules can protect the connected system from large, fast
transient strikes to signal lines. However, you must ground the backplane
to ensure full protection. MB01, MB02, and MB05 backplanes provide
ground studs for this purpose (shown in Figure 2-7). If the possibility of
transient strikes exists, ground the backplane by connecting a ground stud
to system ground using the shortest practical length of large diameter
wire.

MB02

MB01

MB05

Ground

Studs

Figure 2-7. Ground Stud Locations

2-10 Setting Up an MB Series System

Installing MB Series Modules in the Backplane

To install a module in a backplane socket, perform the following steps:

1. Align the module’s retaining screw (provided with the module) and

connector pins with the holes in the backplane as shown in Figure
2-8.

MB02 Backplane

Figure 2-8. Mounting an MB Series Module

2. Gently press the module down so that the pins are fully inserted.

3. Tighten the retaining screw (do not overtighten).

Installing MB Series Modules in the Backplane 2-11

Connecting Signals to the Backplane

This section provides general instructions for physically attaching signals
to MB Series modules, as well as wiring diagrams for specific module
models.

Physical Connection

Connect signals to an MB Series module by attaching the signal wires to
the module’s signal terminal block as shown in Figure 2-9. Use #14 - #22
AWG wire.

Signal
Terminal Block

MB02 Backplane

Signal Wires

Figure 2-9. Connecting Signal Wires

2-12 Setting Up an MB Series System

Wiring Specific Modules

Table 2-2 provides wiring diagrams when attaching input modules to the
MB01, MB02, MB03, MB04, MB05, and STA-1360 backplanes; Table
2-3 provides wiring diagrams when attaching input modules to the
STA-MB backplane.

T able 2-4 pro vides wiring diagrams when attaching output modules to the
MB01, MB02, MB03, MB04, MB05, and STA-1360 backplanes; Table
2-5 provides wiring diagrams when attaching output modules to the
STA-MB backplane.

Caution:

Make sure you use the wiring diagrams for your backplane.

Table 2-2. MB Series Input Module Wiring Diagrams:

MB01, MB02, MB03, MB04, MB05, STA-1360

Modules Signal Wiring Diagram Modules Signal Wiring Diagram

MB30
MB31
MB40
MB41

MB32

–+

4321

HILO

–+

mV , V

1

Current

Conversion

Resistor

–+

20 Ω

4321

MB37
MB47

MB38
full-bridge

–+

4321

Thermocouple

–+–EXC +EXC

4321

4-20 mA

Strain Gauge

Connecting Signals to the Backplane 2-13

Table 2-2. MB Series Input Module Wiring Diagrams:

MB01, MB02, MB03, MB04, MB05, STA-1360 (cont.)

Modules Signal Wiring Diagram Modules Signal Wiring Diagram

MB34 MB38

–EXC

MB36 MB45

3 wire

Potentiometer

2 wire

Slidewire

4 wire

–+

4321

3 & 4 wire

RTD

–

+–EXC

+EXC

2 wire

+EXC

4321

4321

half-bridge

TTL
Inputs

Zero-Crossing
Inputs

+–EXC +EXC

Strain Gauge

–

+–EXC

–

+

Frequency

4321

+EXC

4321

+

Notes

1

See “Current Conversion Resistor” on page 2-17 for instructions on installing the resistor.

2-14 Setting Up an MB Series System

.

Table 2-3. MB Series Input Module Wiring Diagrams:

STA-MB

Modules Signal Wiring Diagram Modules Signal Wiring Diagram

MB30
MB31

–+

MB37
MB47

–+

MB40
MB41

MB32

HI LO

1

mV , V

20 Ω

4-20 mA

–+

–+

Current
Conversion
Resistor

MB38
full-bridge

Thermocouple

–+ –EXC+EXC

Strain Gauge

Connecting Signals to the Backplane 2-15

Table 2-3. MB Series Input Module Wiring Diagrams:

STA-MB (cont.)

Modules Signal Wiring Diagram Modules Signal Wiring Diagram

MB34 MB38

MB36 MB45

3 wire

Potentiometer

2 wire

Slidewire

–+

+EXC –EXC

RTD

+ +EXC

4 wire

2 wire

3 & 4 wire

–

half-bridge

–EXC

+ +EXC –EXC

Strain Gauge

–

+

–

–

+EXC

+

+

Frequency

TTL
Inputs

Zero-Crossing
Inputs

–EXC

Notes

1

See “Current Conversion Resistor” on page 2-17 for instructions on installing the resistor.

Table 2-4. MB Series Output Module Wiring Diagram:

MB01, MB02, MB03, MB04, MB05, STA-1360

Module Wiring Diagram

MB39

OUT LO

2-16 Setting Up an MB Series System

–+

4321

OUT HI

Table 2-5. MB Series Output Module Wiring Diagram:

Module Wiring Diagram

MB39

OUT HI

Current Conversion Resistor

The MB32 comes with an external 20 Ω current conversion resistor. This
resistor is mounted externally because the module cannot protect it from
being destroyed by an accidental connection to the power line. For all
backplanes except the MB04, mount the resistor in the socket located
behind the signal terminal block as shown in Figure 2-10. For the MB04,
mount the resistor in the socket in front of the signal terminal block.

STA-MB

–+

OUT LO

Current Conversion
Resistor

MB02 Backplane

Signal Terminal Block

Figure 2-10. Installing the Current Conversion Resistor

(MB01, MB02, MB03, MB05, STA-1360, STA-MB)

Connecting Signals to the Backplane 2-17

Connecting Backplanes to Keithley MetraByte Analog I/O Boards

This section tells how to connect MB Series backplanes to popular
Keithley MetraByte analog I/O boards. The cabling and addressing
scheme you use depends on both the backplane model and the analog
board model. Once you have read the introductory sections, refer to the
section for your specific combination; if information for your board is not
here, refer to the user’s guide for your board.

Configuring for Single-Ended Operation

Many Keithley MetraByte analog boards can be configured to accept
either differential or single-ended inputs. In a single-ended configuration,
all input voltages are compared to a common reference ground. In a
differential configuration, each signal voltage input is paired with its o wn
reference voltage.

When using MB Series modules with a Keithley MetraByte analog board,
make sure that the analog I/O board is configured for single-ended
operation. On a Keithley analog I/O board that offer both options, you
typically use a slide switch to set the number of channels to 8
(differential) or 16 (single-ended). Consult the user’s guide for your
Keithley MetraByte analog I/O board to determine the exact method.

Connecting MB01 and MB05 Backplanes

The MB01 backplane supports up to 16 I/O channels per analog board;
the MB05 backplane supports up to 8 I/O channels per analog board.
Since they provide dedicated (non-multiplexed) channel-to-channel data
transfer, the MB01 and MB05 are well-suited for high-speed,
high-resolution applications.

CH 0

A/D and

D/A

Figure 2-11. Typical MB01 or MB05 Application

CH 1

. . .

CH 15

MB01 or MB05

2-18 Setting Up an MB Series System

Caution: When connecting a cable to the MB01 or MB05 backplane,

make sure that you match pin 1 on the cable connector to pin 1 on the
backplane connector. Otherwise the connection will not work.

Figure 2-12 shows the location of pin 1 on the MB01 or MB05
connectors.

Pin 1

Figure 2-12. Location of Pin 1 on MB01 or MB05 Connectors

Connecting the MB01/MB05 to the DAS4, DAS-8, and DAS-800 Series

The following discussion refers to the following analog boards: DAS-4,
DAS-8, DAS-8PGA, DAS-8/A0, µCDAS-8PGA, and DAS-800 Series
8-channel analog input boards.

Use the C-8MB1 cable to connect the DAS board to the MB01 or MB05
backplane. This cable connects MB01/MB05 channels 0 through 7 to
analog input channels 0 through 7 on the DAS board. Refer to Figure 2-13
for a cabling diagram.

The channel connections are single-ended. Make sure that the DAS board
is set for single-ended operation.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-19

DAS-4, D AS-8,

DAS-800

Series

HOST PC

C-8MB1

MB01 or MB05

Use connector P1 or P2

(identical pinouts)

Figure 2-13. Connecting the DAS-4, DAS-8, or DAS-800 Series to the MB01/MB05

Connecting the MB01/MB05 to the DAS-16, DAS-1200, DAS-1400, and
DAS-1600 Series

The following discussion refers to the following analog boards: DAS-16,
DAS-16F, DAS-16G, µCDAS-16G, DAS-1200 Series, DAS-1400 Series,
and DAS-1600 Series boards.

Use the C-16MB1 cable to connect the DAS board to the MB01 or MB05
backplane. This cable connects MB01 channels 0 through 15 to analog
input channels 0 through 15 on the DAS board or connects MB05
channels 0 through 7 to analog input channels 0 through 7 on the DAS
board. Refer to Figure 2-14 for a cabling diagram.

The channel connections are single-ended. Make sure that the DAS board
is set for 16-channel, single-ended operation.

DAS-16/

1200/1400/

HOST PC

1600 Series

Figure 2-14. Connecting the DAS-16, DAS-1200, DAS-1400, or DAS-1600 Series to the

MB01/MB05

2-20 Setting Up an MB Series System

C-16MB1

MB01 or MB05

Use connector P1 or P2

(identical pinouts)

Connecting the MB01/MB05 to the DAS-1800 Series

A DAS-1800ST/HR/AO Series board accepts one MB01 or MB05
backplane through an STA-1800U accessory. Cabling for attaching an
MB01 backplane to an STA-1800U is shown in Figure 2-15. Refer to the
user’s guide for your DAS board for more information.

DAS-1800ST/

HR/AO Series

HOST PC

CDAS-2000 or
CDAS-2000/S
Cable

STA-1800U

C-16MB1

Use connector P1 or P2

(identical pinouts)

MB01 or MB05

Figure 2-15. Connecting the DAS-1800ST/HR/AO Series to the MB01/MB05 using an

STA-1800U

You can connect up to two MB01/MB05 backplanes to an STA-1800HC
or up to four MB01/MB05 backplanes to CONN-1800HC of an
DAS-1800HC Series board, as shown in Figure 2-16. Refer to the
DAS-1800HC Series User’s Guide for more information.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-21

To J1 of an
STA-1800HC or
CONN-1800HC
connected to a
DAS-1800HC
Series board

To J2 of an
STA-1800HC or
CONN-1800HC
connected to a
DAS-1800HC
Series board

To J3 of an
STA-1800HC or
CONN-1800HC
connected to a
DAS-1800HC
Series board

To J4 of an
STA-1800HC or
CONN-1800HC
connected to a
DAS-1800HC
Series board

C-16MB1
Cable

C-16MB1
Cable

C-16MB1
Cable

C-16MB1
Cable

#0 #1 #15
MBXXMB

#0 #1 #15

MBXXMB

#0 #1 #15

MBXXMB

#0 #1 #15

MBXXMB

MB01 or MB05

XX

MB01 or MB05

XX

MB01 or MB05

XX

MB01 or MB05

XX

MB
XX

MB
XX

MB
XX

MB
XX

Note:

Using C-16MB1

cables, you can

connect up to two

MB01/MB05

backplanes to an

ST A-1800HC or up

to four

MB01/MB05

backplanes to a

CONN-1800HC of

the DAS-1800HC

Series board

Figure 2-16. Connecting the DAS-1800HC Series to the MB01/MB05

using the STA-1800HC or CONN-1800HC

Caution: If you are programming an application requiring references to

channel numbering on connectors J1 to J4 of an STA-1800HC or
CONN-1800HC, you can obtain the correct channel numbering from the
pin assignments for these connectors, as described in Appendix B of the
DAS-1800HC Series User’s Guide.

Connecting the MB01/MB05 to the DASCard-1000 Series

A DASCard-1000 Series board accepts one MB01/MB05 backplane
through an STA-U accessory. Cabling for attaching an MB01/MB05
backplane to an STA-U is shown in Figure 2-17. Refer to the
DASCard-1000 Series User’s Guide for more information.

2-22 Setting Up an MB Series System

HOST PC

DASCard-1
000 Series

Cable
included with
DASCard

STA-U

C-16MB1

Figure 2-17. Connecting the DASCard-1000 Series to the MB01/MB05

using an STA-U

Connecting the MB01/MB05 to the DAS-20

Use the C-20MB1 cable to connect the DAS-20 analog board to the
MB01 or MB05 backplane. This cable connects MB01 channels 0
through 15 to DAS-20 analog input channels 0 through 15 or connects
MB05 channels 0 through 7 to DAS-20 analog input channels 0 through

7. Refer to Figure 2-18 for a cabling diagram.

The channel connections are single-ended. Make sure that the DAS-20 is
set for 16-channel, single-ended operation.

Use connector P1 or P2

(identical pinouts)

MB01 or MB05

DAS-20

C-20MB1

HOST PC

MB01 or MB05

Use connector P1 or P2

(identical pinouts)

Figure 2-18. Connecting the DAS-20 to the MB01/MB05

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-23

Connecting MB02 Backplanes

You can connect up to four MB02 backplanes to one analog board to
provide a total of 64 channels. Therefore, the MB02 is well-suited for
larger systems or where the number of analog board channels is limited.

D/A and A/D

inputs and outputs

Digital Out

MB02

MB02

MB02

Analog and Digital

I/O Board

MB02

Figure 2-19. Typical MB02 Application

Caution: When connecting a cable to the MB02 backplane, make sure

that you match pin 1 on the cable connector to pin 1 on the backplane
connector. Otherwise the connection will not work.

Figure 2-20 shows the location of pin 1 on the MB02 connector.

2-24 Setting Up an MB Series System

Pin 1

Figure 2-20. Location of Pin 1 on the MB02 Connector

Connecting the MB02 to the DAS4, DAS-8, and DAS-800 Series

The following discussion refers to the following analog boards: DAS-4,
DAS-8, DAS-8PGA, DAS-8/A0, µCDAS-8PGA, and DAS-800 Series.

Figure 2-21 shows how to connect the DAS board to up to four MB02
backplanes. The STA-SCM8 interface board connects one MB02 board to
one analog input channel on the DAS board. One C-2600 cable connects
each MB02 to the STA-SCM8, and the C-1800 cable connects the
ST A-SCM8 to the DAS board. The channel connections are single-ended;
therefore, make sure that the DAS board is set for single-ended operation.

The four digital output lines on the DAS board select one of the 16 MB02
channels. For example, if you set the digital output lines on the DAS
board to 1000 (8 decimal), MB02 channel 8 is selected on all four
backplanes. DAS board channels 0 to 3 map directly to the connectors
labeled 0 to 3 on the STA-SCM8. Figure 2-22 shows how the STA-SCM8
maps to the DAS board and MB02 interfaces.

The diskette that ships with the MB02 includes example programs for
DAS board/MB02 applications.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-25

HOST PC

DAS-4,

DAS-8, and

DAS-800

Series

MB02

C-1800

MB02

STA-SCM8

MB02

C-2600

(four cables)

MB02

Figure 2-21. Connecting the DAS-4, DAS-8, or DAS-800 Series to the MB02

MB02 Backplane Interfaces

Vread

Vwrite

A/D CH 0 IN

D/A CH 0 OUT

A/D CH 1 IN

D/A CH 1 OUT

A/D CH 2 IN
A/D CH 3 IN

DAS-4, DAS-8,

DAS-800 Series

Interface

Vread

Vwrite

0123

Backplane Connectors

STA-SCM8

Vread

Vread

Figure 2-22. Connecting the DAS-4, DAS-8, or DAS-800 Series to the MB02

using the STA-SCM8

2-26 Setting Up an MB Series System

Connecting the MB02 to the DAS-16, DAS-1200, DAS-1400, and DAS-1600
Series

The following discussion refers to the following analog boards: DAS-16,
DAS-16F, DAS-16G, µCDAS-16G, DAS-1200 Series, DAS-1400 Series,
and DAS-1600 Series.

Figure 2-23 shows how to connect a DAS board to up to four MB02
backplanes. The STA-SCM16 interface board connects one MB02 board
to one analog input channel on the DAS board. One C-2600 cable
connects each MB02 to the STA-SCM16, and the C-1800 cable connects
the STA-SCM16 to the DAS board. The channel connections are
single-ended; therefore, make sure that the analog board is set for
single-ended, 16-channel operation.

The four digital output lines on the DAS board select one of the 16 MB02
channels. For example, if you set the digital output lines on the DAS
board to 1000 (8 decimal), MB02 channel 8 is selected on all four
backplanes. Analog input channels 0 to 3 on the DAS board map directly
to the connectors labeled 0 to 3 on the STA-SCM16. Figure 2-24 shows
how the STA-SCM16 maps to the DAS board and MB02 interfaces.

The diskette that ships with the MB02 includes example-only programs
for DAS board/MB02 applications.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-27

HOST PC

DAS-16,

DAS-1200/1400/

1600 Series

MB02

C-1800

MB02

STA-SCM16

MB02

C-2600

(four cables)

MB02

Figure 2-23. Connecting the DAS-16 or DAS-1200/1400/1600 Series to the MB02

MB02 Backplane Interfaces

Vread

Vwrite

A/D CH 0 IN

D/A CH 0 OUT

A/D CH 1 IN

D/A CH 1 OUT

A/D CH 2 IN
A/D CH 3 IN

DAS-16,

DAS-1200/1400/1600 Series

Interface

Vread

Vwrite

0123

Backplane Connectors

ST A-SCM16

Vread

Vread

Figure 2-24. Connecting the DAS-16 or DAS-1200/1400/1600 Series to the MB02 using

the STA-SCM16

2-28 Setting Up an MB Series System

Connecting the MB02 to the DAS-1800 Series

DAS-1800ST/HR/AO Series boards configured for single-ended inputs
and working through multiple STA-1800U accessories can support up to
16 MB02 backplanes. A single STA-1800U contains receptacles (J4 to J7)
for up to four MB02 backplane cables. Cabling for the four MB02
backplanes attached to an STA-1800U accessory is shown in Figure 2-25.

To J4 of the
STA-1800U
connected to the
DAS-1800ST/HR/
AO Series

To J5 of the
STA-1800U
connected to the
DAS-1800ST/HR/
AO Series

To J6 of the
STA-1800U
connected to the
DAS-1800ST/HR/
AO Series

To J7 of the
STA-1800U
connected to the
DAS-1800ST/HR/
AO Series

Figure 2-25. Connecting the D AS-1800ST/HR/AO Series to the MB02

C-2600

Cable

C-2600

Cable

C-2600

Cable

C-2600

Cable

#0 #1 #15

MBXXMB

XX

#0 #1 #15

MBXXMB

XX

#0 #1 #15

MBXXMB

XX

#0 #1 #15

MBXXMB

XX

using an STA-1800U

MB02

MB
XX

MB02

MB
XX

MB02

MB
XX

MB02

MB
XX

Y ou can connect

up to four MB02

backplanes to

the STA-1800U

Use one STA-1800U for every four MB02 backplanes. Additional
STA-1800U accessories are daisy-chained to the first STA-1800U, using
CACC-2000 cables to connect J2 of one STA-1800U to J1 of the next, as
shown in Figure 2-26.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-29

To Next

STA-1800U

Set for CH 7

Set for CH 6

Set for CH 5

Set for CH 4

T o Board 3 of MB02 Group 2

T o Board 4 of MB02 Group 2

DAS-1800ST/HR/AO

CACC-2000

Cables

STA-1800U

C-2600 Cables

T o Board 2 of MB02 Group 2

To Board 1of MB02 Group 2

Series

Set for CH 1

Set for CH 3

Set for CH 2

Set for CH 0

J2

STA-1800U

T o Board 3 of MB02 Group 1

T o Board 2 of MB02 Group 1

T o Board 4 of MB02 Group 1

To Board 1of MB02 Group 1

Cable

CDAS-2000/S

CDAS-2000 or

J1

Figure 2-26. Daisy-Chaining STA-1800U Accessories with MB02 Backplanes

The jumper pad beside each STA-1800U receptacle (J4 to J7) selects the
channel of a DAS-1800ST/HR/AO Series board that the attached MB02
backplane uses. On the first STA-1800U, the jumpers connect
STA-1800U receptacles J4 to J7 to DAS-1800ST/HR/AO channels 0 to 3,
respectively (default settings), as shown in the diagram. On a second
STA-1800U, you position the jumpers to connect receptacles J4 to J7 to
channels 4 to 7, respectively; and so on. Refer to Appendix B of the DAS
board user’s guide, for a diagram of receptacles J4 to J7 and their
associated jumper pads.

2-30 Setting Up an MB Series System

Connecting the MB02 to the DAS-20

Figure 2-27 shows how to connect the DAS-20 to up to four MB02
backplanes. One CDAS-2000 cable connects the STA-20 to the DAS-20.
The four MB02s are daisy-chained with C-2600 cables.

DAS-20

HOST PC

STA-20 MB02

CDAS-2000

MB02

C-2600 cables have two

connectors at one end

to allow daisy-chaining.

MB02

MB02

Figure 2-27. Connecting the DAS-20 to the MB02

Digital output lines 0 to 5 on the DAS-20 select one of the 64 MB02
channels (4 backplanes x 16 channels = 64 channels total). For example,
if you set the DAS-20 digital output lines to 101000 (40 decimal), MB02
channel 40 is selected. All MB02 channels are multiple x ed into channel 0
on the DAS-20.

The channel connections are single-ended; therefore, make sure that
switches and jumpers are set as follows:

● DAS-20 is set for 16-channel operation.

● STA-20 DIFF/SE jumper is set to SE.

● MB02 address jumpers are set to assign a unique block of 16

addresses to each MB02, described next.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-31

DAS-20 digital output lines 0 to 5 select one of the 64 channels on the
four MB02 backplanes. You must set the address jumpers on the MB02s
so that each one has a set of 16 unique addresses. Figure 2-28 shows the
location of the address jumper blocks.

SH

1
2
3
4
5

SH 1-5
Input Address

Jumpers

SH 6-10

Output Address

Jumpers

6
7
8
9
10

Figure 2-28. MB02 Address Jumper Locations

Jumpers SH1-5 set input (read) addresses and jumpers SH6-10 set output
(write) addresses. Table 2-6 shows the address ranges selected by each
jumper setting. Backplanes are factory configured with jumpers at
positions 1 and 6. This sets up the backplane as a single-backplane,
16-channel system.

2-32 Setting Up an MB Series System

Table 2-6. MB02 Address Selection Jumpers

Input
Jumper

1 6 stand-alone
2 7 48-63
3 8 32-47
4 9 16-31
5 10 0-15

Output
Jumper

Range

The following example shows how the address jumpers are used in a
multi-backplane setup. In this example, all four MB02 backplanes are
used for signal inputs.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-33

SH

1
2
3
4
5

SH

1
2
3
4
5

SH

1
2
3
4
5

Input
Addresses
0-15

Input
Addresses
16-31

Input
Addresses
32-47

16

32

. . .

1

0

. . .

17

. . .

33

SH

1
2
3
4
5

Input
Addresses
48-64

48

49

. . .

Figure 2-29. MB02 Address Jumper Example

2-34 Setting Up an MB Series System

Connecting MB03, MB04, and STA-1360 Backplanes

The MB03, MB04, and STA-1360 backplanes provide screw terminal
outputs. To connect these backplanes to a Keithley MetraByte analog I/O
board, you must wire the outputs to an accessory board that connects
screw terminal inputs to the appropriate connector for your analog board.
For example, the STC-37 connects screw terminal inputs to a 37-pin
D-connector.

Connecting STA-MB Backplanes

On the STA-MB backplane, the inputs and outputs of four MB Series
modules, as well as all 37 I/O connector pins, are brought out to screw
terminals. You can connect the input or output of any module to any pin
on the I/O connector by wiring the appropriate screw terminals together.
This allows you to add up to four channels of signal-conditioned I/O to
your system.

A module input or output travels to the DAS board through the following
path, which you can trace in Figure 2-30:

● Module input/output pin to module input/output screw terminal

through the STA-MB backplane

● Module input/output screw terminal to I/O connector screw terminal

through a user-installed wire; refer to the next subsection for
information on installing this wire.

● I/O connector screw terminal to I/O connector pin through the

STA-MB backplane

● I/O connector pin to DAS board through the cable

Wiring Module Inputs and Outputs to the DAS Board

The following procedure tells how to wire a module input or output to a
specific DAS board I/O connector pin. Repeat for each connection.

1. Using the I/O connector pinout in your DAS board manual, determine

the number of the pin you want to connect to the module input or
output.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-35

2. On the STA-MB, find the screw terminal with the same number.

3. Wire this screw terminal to the desired module input or output screw

terminal.

Figure 2-30 shows an example in which the Channel 0 module output is
wired to screw terminal 37. This connects to pin 37 on the I/O connector,
which is CH0 HI IN on a DAS-1600 Series board.

37

Channel 0 MB Series

Module Vout (+) wired

to DAS-1600 CH0 HI

IN (pin 37)

To DAS board

Chan 0

­+

­+

­+

­+

0

LO

+ EXC

- EXC

Inputs from
transducer

Chan 0

HI

Chan 0 MB Socket

Diff SE

Figure 2-30. STA-MB/DAS-1600 Series Wiring Example

2-36 Setting Up an MB Series System

Setting STA-MB Single-Ended/Differential Switches

The STA-MB provides a set of DIP switches that lets you select either a
single-ended or differential output configuration for each module. The
single-ended setting (SE) grounds the low (-) output for the selected
module so that only the high (+) output need be wired to the screw
terminal input. Figure 2-31 shows the DIP switches set for single-ended
operation on all channels.

STA-MB

Diff SE

Chan 0
Chan 1
Chan 2
Chan 3

Figure 2-31. STA-MB Single-Ended/Differential Switches

Cabling to the STA-MB

This section describes some common cabling arrangements in systems
using a DAS board and an STA-MB. Many possible arrangements exist.
If you are unsure of how to cable your system, contact Keithley’s
Applications Engineering Department at [phone] between
8:00 AM and 6:00 PM EST, Monday through Friday.

Figure 2-32 shows a DAS-800 Series board connected directly to an
STA-MB using the C-1800 cable.

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-37

HOST PC

DAS-800

Series
Board

C-1800

STA-MB

Use either connector

(identical pinouts)

Figure 2-32. Connecting the DAS-800 Series to the STA-MB

Figure 2-33 shows a DAS-8 board connected to an EXP-16, which is
daisy-chained to an STA-MB using two C-1800 cables.

DAS-8

HOST PC

C-1800

EXP-16

C-1800

STA-MB

Use either connector

(identical pinouts)

Figure 2-33. Connecting the DAS-8 to the STA-MB using an EXP-16

Figure 2-34 shows a DAS-800 Series board connected to an EXP-800,
which is daisy-chained to an STA-MB using a CAB-3740 and C-1800
cable.

EXP-800

C-1800

STA-MB

Use either connector

(identical pinouts)

HOST PC

DAS-800

Series

CAB-3740

Figure 2-34. Connecting the DAS-800 Series to the STA-MB using an EXP-800

2-38 Setting Up an MB Series System

Figure 2-35 shows a DAS-1400/1200/1600 Series board or
DASCard-1000 Series card connected to an EXP-1600, which is
daisy-chained to an STA-MB using a CAB-3740 and C-1800 cable.

HOST PC

DAS-1200/1400/

1600 or

DASCard-1000

Series

CAB-3740

EXP-1600

C-1800

STA-MB

Use either connector

(identical pinouts)

Figure 2-35. Connecting the DAS-1200/1400/1600 or DASCard-1000 Series to the

STA-MB using an EXP-1600

Connecting Backplanes to Keithley MetraByte Analog I/O Boards 2-39

3

MB Series Module

Descriptions

This chapter contains descriptions, specifications, functional block
diagrams, input field connection diagrams, and ordering information for
all MB Series modules. It includes the following sections:

●

MB30 and MB31 millivolt and voltage input modules
MB32 current input module

●

MB34 RTD input module

●

●

MB36 potentiometer input modules

●

MB37 thermocouple input module
MB38 strain gauge input module

●

●

MB39 current output module

●

MB40 and MB41 wide bandwidth millivolt volt input modules
MB45 frequency input modules

●

MB47 linearized thermocouple input module

●

●

MBAF Series active low-pass filter modules

3-1

MB30 and MB31 Millivolt and Voltage Input Modules

The MB30 millivolt input module accepts ±5 to ±100 mV input signals
and provides either a –5 V to +5 V or 0 to +5 V output. The MB31 voltage
input module accepts ±1 V to ±40 V input signals and provides either a
–5 V to +5 V or 0 to +5 V output.

Figure 3-1 on page 3-3 is a functional block diagram for the MB30 and
MB31. A protection circuit assures safe operation even if a 240 V
power line is connected to the input screw terminals, and, in the MB31,
the input signal is attenuated by a factor of 20 at this point. A three-pole
filter with a 4 Hz cutoff provides 60 dB of NMR (Normal-Mode
Rejection) and CMR enhancement at 60 Hz. (One pole of this filter is
located at the module input, while the other two poles are in the output
stage for optimum noise performance). A chopper-stabilized input
amplifier provides all of the module’s gain and assures low drift. This
amplifier operates on the input signal after subtraction of a stable,
laser-trimmed voltage, which sets the zero-scale input v alue. It is possible
to suppress a zero-scale input that is many times the total span to provide
precise expanded scale measurements.

rms

Signal isolation is provided by transformer coupling using a proprietary
modulation technique for linear, stable performance. A demodulator on
the output side of the signal transformer recovers the original signal,
which is then filtered and buffered to provide a clean, low-impedance
output. A series output switch is included to eliminate the need for
external multiplexing in many applications. This switch has a low output
resistance and is controlled by an active-lo w enable input. In cases where
the output switch is not used, the enable input should be grounded to
power common to turn on the switch, as it is on the MB01 and MB05
backplanes.

The single +5 V supply powers a clock oscillator, which drives power
transformers for the input and output circuits. The input circuit is, of
course, fully floating. In addition, the output section acts as a third
floating port, eliminating many problems that might be created by ground
loops and supply noise. However, the common-mode range of the output
circuit is limited: output common must be kept within ±3 V of power
common.

3-2 MB Series Module Descriptions

A current path to insure that the voltage from power common to

Note:

output common remains within ±3 V must exist for proper operation of
the demodulator and output switch.

4

+EXC

HI

Vin

LO

-EXC

* internally committed, reserved
for CJC sensor connection.

4 (nc)

3

2

1

prot (&

6

5

3 (nc)

1*

2*

20x

atten

MB31

only)

Vz

Figure 3-1. MB30 and MB31 Functional Block Diagram

Table 3-1 lists the specifications for the MB30 and MB31 modules. Note
that specifications are typical at 25°C and +5 V and are subject to change
without notice. Table 3-2 lists the ordering information for the MB30 and
MB31 modules.

LPF

laser

adj ref

chopper
diff amp

+

-

rect &

filter

signal

isolation

power

isolation

active

LPF

3-pole

P. S .

power

osc.

20

19

22

17

16

Vout

I/O
COM

READ
EN (0)

+5V

PWR
COM

MB30 and MB31 Millivolt and Voltage Input Modules 3-3

Table 3-1. MB30 and MB31 Specifications

Specification MB30 MB31

Input Span Limits ±5 mV to ±100 mV ±1 V to ±40 V
Output Ranges –5 V to +5 V or 0 to +5 V –5 V to +5 V or 0 to +5 V

1

2

Accuracy

,

Nonlinearity ±0.02% span ±0.02% span
Stability vs. Ambient

Temperature

Input Offset
Output Offset
Gain

±0.05% span ±10 µV RTI
±0.05% (V

)

z

±1 µV/°C
±20 µV/°C
±25 ppm of reading/°C

±0.05% span ±0.2 mV RTI
±0.05%(V

)

z

±20 µV/°C
±20 µV/°C

±50 ppm of reading/°C
Input Bias Current ±3 nA ±0.2 nA
Input Resistance

Normal
Power Off
Overload

5 M Ω
40 k Ω
40 k Ω

650 k Ω

650 k Ω

650 k Ω
Noise

Input, 0.1-10 Hz
Output, 100 kHz

0.2 µV
200 µV

rms

rms

RTI

RTO

2 µV

rms

200 µV
Bandwidth, –3 dB 4 Hz 4 Hz

Rise Time, 10% to 90% Span 0.2 s 0.2 s
CMV, Input to Output

Continuous
Transient

1500 V

rms

max

meets IEEE-STD 472 (SWC)

1500 V

meets IEEE-STD 472 (SWC)
CMR (50 or 60 Hz)

1 k Ω in Either or Both Input

Leads

160 dB (all ranges) 160 dB (span < ±2 V)

150 dB (span = ±10 V)
NMR (50 or 60 Hz) 60 dB 60 dB
Input Protection

Continuous
Transient

240 V

max continuous

rms

meets IEEE-STD 472 (SWC)

240 V

rms

meets IEEE-STD 472 (SWC)

RTI

RTO

rms

max

rms

max continuous

Output Resistance

3

50 Ω

50 Ω
Voltage Output Protection Continuous Short to Ground Continuous Short to Ground

3-4 MB Series Module Descriptions

Table 3-1. MB30 and MB31 Specifications (cont.)

Specification MB30 MB31

Output Selection Time 20 µs 20 µs
Output Selection Input

Max Logic “0”
Min Logic “1”
Max Logic “1”

Input Current “0”
Power Supply Voltage +5 V ±5% +5 V ±5%
Power Supply Sensitivity ±2 µV/Vs% (RTI) ±0.4 mV/Vs% (RTI)
Power Consumption 150 mW (30 mA) 150 mW (30 mA)

+1 V
+2.5 V
+36 V

0.4 mA

+1 V
+2.5 V
+36 V

0.4 mA

Size 2.25" x 2.25" x 0.60"

(52 mm x 52 mm x 15 mm)

2.25" x 2.25" x 0.60"
(52 mm x 52 mm x 15 mm)

Environmental

Temperature Range, Rated

–25°C to +85°C

–25°C to +85°C

Performance

Temperature Range,

–40°C to +85°C

–40°C to +85°C

Operating
Temperature Range, Storage
Relative Humidity (MIL

202)

RFI Susceptibility

Notes

1

Includes the combined effects of repeatability , hysteresis, and nonlinearity and assumes v ery high load

resistance.

2

Vz is the nominal input voltage that results in a 0 V output.

3

The output resistance value can be used to determine gain error when the module is driving a resistive

–40°C to +85°C
0 to 95% @ 60°C
noncondensing
±0.5% span error @ 400 MHz,
5 W, 3 feet

–40°C to +85°C
0 to 95% @ 60°C
noncondensing
±0.5% span error @ 400 MHz,
5 W, 3 feet

load. However, loads heavier than 20 k Ω will degrade nonlinearity and gain temperature coefficient.

MB30 and MB31 Millivolt and Voltage Input Modules 3-5

Table 3-2. MB30 and MB31 Ordering Information

Input Range Output Range Model

–10 mV to +10 mV –5 V to +5 V MB30-01
–50 mV to +50 mV –5 V to +5 V MB30-02
–100 mV to +100 mV –5 V to +5 V MB30-03
–10 mV to +10 mV 0 to +5 V

–50 mV to +50 mV 0 to +5 V
–100 mV to +100 mV 0 to +5 V

MB30-04
MB30-05
MB30-06

1

1

1

–1 V to +1 V –5 V to +5 V MB31-01
–5 V to +5 V –5 V to +5 V MB31-02
–10 V to +10 V –5 V to +5 V MB31-03
–1 V to +1 V 0 to +5 V

–5 V to +5 V 0 to +5 V
–10 V to +10 V 0 to +5 V

MB31-04
MB31-05
MB31-06

1

1

1

–20 V to +20 V –5 V to +5 V MB31-07
–20 V to +20 V 0 to +5 V MB31-08

1

–40 V to +40 V –5 V to +5 V MB31-09
–40 V to +40 V 0 to +5 V MB31-10

Notes

1

These ranges map bipolar input ranges into unipolar output ranges; 0 maps to

1

+2.5 V.

3-6 MB Series Module Descriptions

MB32 Current Input Module

The MB32 current input module measures a 4-20 mA or 0-20 mA process
current input signal by reading the voltage across a precision 20 Ω
resistor. It provides a 0 to +5 V output signal.

Figure 3-2 on page 3-8 is a functional block diagram for the MB32. Since
the resistor cannot be protected against destruction in the event of an
inadvertent connection of the power line, it is provided in the form of a
separate pluggable resistor carrier assembly. A protection circuit assures
safe operation even if a 240 V
screw terminals. A three-pole filter with a 4 Hz cutoff provides 60 dB of
NMR (Normal Mode Rejection) and CMR enhancement at 60 Hz. (One
pole of this filter is located at the module input, while the other two poles
are in the output stage for optimum noise performance.) A
chopper-stabilized input amplifier provides all of the module’s gain and
assures low drift. This amplifier operates on the input signal after
subtraction of a stable, laser-trimmed voltage, which sets the zero-scale
input value for the 4-20 mA range.

power line is connected to the input

rms

Signal isolation is provided by transformer coupling using a proprietary
modulation technique for linear, stable performance. A demodulator on
the output side of the signal transformer recovers the original signal,
which is then filtered and buffered to provide a clean, low-impedance
output. A series output switch is included to eliminate the need for
external multiplexing in many applications. This switch has a low output
resistance and is controlled by an active-lo w enable input. In cases where
the output switch is not used, the enable input should be grounded to
power common to turn on the switch, as it is on the MB01 and MB05
backplanes.

The single +5 V supply powers a clock oscillator, which drives power
transformers for the input and output circuits. The input circuit is, of
course, fully floating. In addition, the output section acts as a third
floating port, eliminating many problems that might be created by ground
loops and supply noise. However, the common-mode range of the output
circuit is limited: output common must be kept within ±3 V of power
common.

MB32 Current Input Module 3-7

A current path to insure that the voltage from power common to

Note:

output common remains within ±3 V must exist for proper operation of
the demodulator and output switch.

The resistor is a 20 Ω , 0.1% (typical), 1/4 watt, 20 ppm/
is fully encapsulated. The resistor tolerance directly affects the
performance of the data acquisition system and should be included in the
worst case analysis of the system. It ships with the MB32 module.

4

+EXC

+

Iin

-

* internally committed, reserved
for CJC sensor connection.

3

2

1

-EXC

20 Ω

4 (nc)

6

5

3 (nc)

1*

2*

prot

Vz

LPF

laser

adj ref

chopper
diff amp

+

-

rect &

filter

signal

isolation

power

isolation

active

LPF

2-pole

P. S .

power

osc.

°C

resistor which

20

Vout

19

I/O
COM

22

READ
EN (0)

17

+5 V

16

PWR
COM

Figure 3-2. MB32 Functional Block Diagram

Table 3-3 lists the specifications for the MB32 module. Note that
specifications are typical at 25°C and +5 V and are subject to change
without notice. Table 3-4 lists the ordering information for the MB32
module.

3-8 MB Series Module Descriptions

Table 3-3. MB32 Specifications

Specification MB32

Input Ranges 0 to 20 mA, 4 to 20 mA
Output Range 0 to +5 V

1

2

Accuracy
Input Resistor

Nonlinearity ±0.02% span
Stability vs. Ambient Temperature

,

3

Value
Accuracy

Module Offset
Module Gain

±0.05% span ±0.05% (I

20.00 Ω
±0.1%

±0.0025%/°C of I

z

±0.0025%/°C of reading/°C

)

z

Stability of Supplied Input Resistor ±0.001%/°C
Noise

Input, 0.1-10 Hz
Output, 100 kHz

10 nA
200 µV

rms

rms

RTI

RTO

Bandwidth, –3 dB 4 Hz
Rise Time, 10% to 90% Span 0.2 s
CMV, Input to Output

Continuous
Transient

1500 V

rms

max

meets IEEE-STD 472 (SWC)

CMR (50 or 60 Hz)

1 k Ω in Either or Both Input Leads 160 dB (all ranges)
NMR (50 or 60 Hz) 60 dB
Input Protection

Continuous

Transient

Output Resistance

4

240 V

max continuous

rms

meets IEEE-STD 472 (SWC)
50 Ω

Voltage Output Protection Continuous Short to Ground
Output Selection Time 20 µs

MB32 Current Input Module 3-9

Table 3-3. MB32 Specifications (cont.)

Specification MB32

Output Selection Input

Max Logic “0”

Min Logic “1”

Max Logic “1”

Input Current “0”
Power Supply Voltage +5 V ±5%
Power Supply Sensitivity ±2 µV/Vs% (RTI)
Power Consumption 150 mW (30 mA)
Size 2.25" x 2.25" x 0.60"

Environmental

Temperature Range, Rated

Performance
Temperature Range, Operating
Temperature Range, Storage
Relative Humidity (MIL 202)
RFI Susceptibility

+1 V
+2.5 V
+36 V

0.4 mA

(52 mm x 52 mm x 15 mm)

–25°C to +85°C

–40°C to +85°C
–40°C to +85°C
0 to 95% @ 60°C noncondensing
±0.5% span error @ 400 MHz, 5W, 3 feet

Notes

1

Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes

very high load resistance. Does not include input resistor error.

2

I

is the nominal value of input current which results in an output of 0 V.

z

3

The current-to-voltage conversion resistor is supplied as a plug-in component for

mounting external to the module.

4

The output resistance value can be used to determine gain error when the module is

driving a resistive load. Ho we ver , loads heavier than 20 k Ω will degrade nonlinearity and
gain temperature coefficient.

Table 3-4. MB32 Ordering Information

Input Range Output Range Model

4-20 mA 0 to +5 V MB32-01
0-20 mA 0 to +5 V MB32-02

3-10 MB Series Module Descriptions

MB34 RTD Input Module

The MB34 RTD input module accepts a wide variety of RTD types as
inputs and provides a linearized output of 0 to +5 V.

Figure 3-3 on page 3-12 is a functional block diagram of the MB34.
Excitation for the RTD is provided by a current source, with an identical
current taken through the third RTD lead in such a way as to cancel the
effects of (equal) lead resistances. The second current also flows in R
which is laser-trimmed to the value of the RTD at the temperature that is
to result in a module output of zero volts. Thus, the input seen by the
differential amplifier is zero at that scale point. Since both current sources
are connected to input screw terminals, they are protected against
accidental application of voltages up to 240 V
networks serves the same function for the amplifier, and input filtering is
provided at the same points.

. A pair of protection

rms

,

z

The differential amplifier is a chopper-stabilized design featuring
exceptionally low drift. This makes possible the use of very low RTD
excitation currents to minimize self-heating without incurring any loss of
accuracy. A feedback linearizer is laser-trimmed along with the module’s
gain and zero settings.

Signal isolation is provided by transformer coupling using a proprietary
modulation technique for linear, stable performance. A demodulator on
the output side of the signal transformer recovers the original signal,
which is then filtered and buffered to provide a clean, low-impedance
output. A series output switch is included to eliminate the need for
external multiplexing in many applications. This switch has a low output
resistance and is controlled by an active-lo w enable input. In cases where
the output switch is not used, the enable input should be grounded to
power common to turn on the switch, as it is on the MB01 and MB05
backplanes.

The single +5 V supply powers a clock oscillator, which drives power
transformers for the input and output circuits. The input circuit is, of
course, fully floating. In addition, the output section acts as a third
floating port, eliminating many problems that might be created by ground
loops and supply noise. However, the common-mode range of the output
circuit is limited: output common must be kept within ±3 V of power
common.

MB34 RTD Input Module 3-11

A current path to insure that the voltage from power common to

Note:

output common remains within ±3 V must exist for proper operation of
the demodulator and output switch.

3 & 4 wire

2 wire

4 wire

4

4

3

6

2

5

1

3

(nc)

1 Not connected

2 Not connected

Table 3-5 lists the specifications for the MB34 module. Note that
specifications are typical at 25°C and +5 V and are subject to change
without notice. Table 3-6 lists the ordering information for the MB34
module.

Rz

prot &

filt

prot prot

prot &

filt

chopper
diff amp

+

-

rect &

filter

signal

isolation

power

isolation

active

LPF

3-pole

P. S .

Figure 3-3. MB34 Functional Block Diagram

power

osc.

20

19

22

17

16

Vout

I/O
COM

READ
EN (0)

+5 V

PWR
COM

3-12 MB Series Module Descriptions

Table 3-5. MB34 Specifications

Specification MB34

Input Span Limits 25°C to 1070°C (100 Ω Pt)
Output Range 0 to +5 V

Accuracy

1,2,3

Conformity Error

4

±0.05% span ±0.1 Ω ±0.05% (Rz)
±0.05% span

Stability vs. Ambient Temperature

Input Offset
Output Offset
Gain

±0.02°C/°C
±20 µV/°C

±50 ppm of reading/°C
Input Bias Current ±3 nA
Input Resistance

Normal
Power Off
Overload

5 MΩ

40 kΩ

40 kΩ
Noise

Input, 0.1-10 Hz
Output, 100 kHz

0.2 µV

200 µV
Bandwidth, –3 dB 4 Hz

Rise Time, 10% to 90% Span 0.2 s
CMV, Input to Output

Continuous
Transient

1500 V

meets IEEE-STD 472 (SWC)

rms

rms

rms

RTI

RTO

max

CMR (50 or 60 Hz)

1 kΩ in Either or Both Input Leads 160 dB (all ranges)

NMR (50 or 60 Hz) 60 dB
Sensor Excitation Current

100 Ω Pt, 120 Ω Ni
10 Ω Cu

0.25 mA

1.0 mA

Lead Resistance Effect

100 Ω Pt, 120 Ω Ni
10 Ω Cu

±0.02°C/Ω

±0.2°C/Ω

MB34 RTD Input Module 3-13

Table 3-5. MB34 Specifications (cont.)

Specification MB34

Input Protection

Continuous 240 V

Output Resistance

5

50 Ω
Voltage Output Protection Continuous Short to Ground

Output Selection Time 20 µs
Output Selection Input

Max Logic “0”
Min Logic “1”
Max Logic “1”
Input Current “0”

+1 V

+2.5 V

+36 V

0.4 mA
Power Supply Voltage +5 V ±5%
Power Supply Sensitivity

100 Ω Pt, 120 Ω Ni
10 Ω Cu

0.05°C/V

0.5°C/V
Power Consumption 150 mW (30 mA)
Size 2.25" x 2.25" x 0.60"

(52 mm x 52 mm x 15 mm)

max continuous

rms

Environmental

Temperature Range, Rated

–25°C to +85°C

Performance
Temperature Range, Operating
Temperature Range, Storage
Relative Humidity (MIL 202)

Notes

1

±0.025 W for 1 mA excitation used with Cu RTDs.

2

Rz is the value of the RTD resistance at the lowest point of the measurement range.

3

Includes the combined effects of repeatability hysteresis, and linearity and assumes very

high load resistance. Does not include sensor or signal source error.

4

For Pt RTDs only; other types may vary.

5

The output resistance value can be used to determine gain error when the module is

–40°C to +85°C
–40°C to +85°C
0 to 95% @ 60°C noncondensing

driving a resistive load. Note, however, that loads heavier than 20 kΩ will also degrade
nonlinearity and gain temperature coefficient.

3-14 MB Series Module Descriptions

Table 3-6. MB34 Ordering Information

Type Input Range

Output
Range Model

100 Ω Pt, α = 0.00385 –100°C to +100°C

(–148°F to +212°F)

100 Ω Pt, α = 0.00385 0 to +100°C (+32°F to 212°F) 0 to +5 V MB34-02
100 Ω Pt, α = 0.00385 0 to +200°C (+32°F to 392°F) 0 to +5 V MB34-03
100 Ω Pt, α = 0.00385 0 to +600°C (+32°F to 1112°F) 0 to +5 V MB34-04
10 Ω Cu 0 to +120°C (10 Ω @ 0°C)

(+32°F to +248°F)

10 Ω Cu 0 to +120°C (10 Ω @ 25°C)

(+32°F to +248°F)

120 Ω Ni 0 to +300°C (+32°F to +572°F) 0 to +5 V MB34-N-01

0 to +5 V MB34-01

0 to +5 V MB34-C-01

0 to +5 V MB34-C-02

MB34 RTD Input Module 3-15

MB36 Potentiometer Input Module

The MB36 potentiometer input module provides a single channel of
potentiometer input that is filtered, isolated, amplified, and converted to a
high-level analog voltage output (0 to 5 V). The voltage output is
logic-switch controlled, which allows this module to share a common
analog bus without requiring external multiplexers.

Figure 3-4 on page 3-17 is a functional block diagram of the MB36.

The MB36 potentiometer input module contains a completely isolated
computer-side circuit that you can float to ±50 V from PWR COM, pin

16. Complete isolation means that no connection is required between I/O
COM and PWR COM for proper operation of the output switch. If
desired, you can turn on the output switch continuously by connecting pin
22, the READ EN pin, to I/O COM, pin 19.

Excitation for the potentiometer is provided from the module by two
matched current sources. Using a three-wire potentiometer allows you to
cancel the effects of lead resistances. The excitation currents are very
small (less than 1.0 mA), which minimizes self-heating.

Signal filtering is accomplished with a six-pole filter that provides 95 dB
of normal mode rejection at 60 Hz and 90 dB at 50 Hz. Two poles of this
filter are on the field side of the isolation barrier and the other four poles
are in the output stage. After the initial field-side filtering, the input signal
is chopped by a proprietary chopper circuit. Isolation is provided by
transformer coupling, which is implemented using a proprietary
technique to suppress transmission of common mode spikes or surges.

The module is powered from +5 VDC, ±5%. A special circuit in the
module provides protection against accidental connection of power-line
voltages up to 240 VAC.

3-16 MB Series Module Descriptions

3-wire
Potentiometer

4

3

2

1

2-wire
Sidewire

4

4

6

5

3

surge

suppres-

sion &

protec-

tion

− V

prot

prot

− V

LPF

Isolated
chopper
Amplifier

LPF

− V

+ V

Isolated

Computer-Side

Power

3

2

1

(nc)

20

19

22

Vout

I/O
COM

READ
EN (0)

1 Not connected

2 Not connected

Figure 3-4. MB36 Functional Block Diagram

Table 3-5 lists the specifications for the MB36 module. Note that
specifications are typical at 25°C and +5 V and are subject to change
without notice. Table 3-6 lists the ordering information for the MB36
module.

+ V

− V

Isolated

Field-Side

Power

power

osc.

17

16

+5 V

PWR
COM

MB36 Potentiometer Input Module 3-17

Table 3-7. MB36 Specifications

Specification MB36

Input Span Limits 0 to 10 kΩ
Output Range 0 to +5 V
Accuracy
Stability vs. Ambient Temperature

Input Resistance

Noise

Bandwidth, –3 dB 4 Hz
Response time, 90% span 0.2 s

1

Input Offset

Output Offset
Gain

Normal
Power Off
Overload

Input, 0.1-10 Hz
Output, 100 kHz

±0.08% span

±0.004 Ω/°C; 100 Ω, 500 Ω, 1 kΩ sensor
±0.010 Ω/°C; 10 kΩ sensor
±20 µV/°C
±50 ppm of reading/°C

50 MΩ
40 kΩ
40 kΩ

0.2 µV

rms

200 µV

rms

RTI

RTO

2

3

CMV, Input to Output

Continuous
Transient

1500 V

rms

max

ANSI/IEEE C37.90.1-1989
CMR (50 or 60 Hz) 160 dB
NMR 95 dB at 60 Hz

90 dB at 50 Hz
Sensor Excitation Current

100 Ω, 500 Ω, 1 kΩ
10 kΩ

0.25 mA

0.10 mA

Lead Resistance Effect

100 Ω, 500 Ω, 1 kΩ
10 kΩ

±0.10 Ω/Ω

±0.02 Ω/Ω
Input Protection

Continuous
Transient

240 V

max continuous

rms

ANSI/IEEE C37.90.1-1989

3-18 MB Series Module Descriptions

Table 3-7. MB36 Specifications (cont.)

Specification MB36

Output Resistance 50 Ω
Voltage Output Protection Continuous Short to Ground
Output Selection Time (to 1 mV of V

) 6 µs at C

OUT

= 0 to 2000 pF

LOAD

Output Current Limit 14 mA maximum
Environmental

Max Logic "0"
Min Logic "1"
Max Logic "1"
Input Current "0, 1")

+0.8 V

+2.4 V

+3.6 V

+0.5 µA
Power Supply V oltage +5 V ±5%
Power Supply Sensitivity ±2 µV/% RTI

1

Power Supply Current 30 mA
Size 2.28" x 2.26" x 0.60"

(58 mm x 57 mm x 15 mm)
Environmental

Temperature Range, Rated

–25°C to +85°C

Performance
Temperature Range, Operating
Temperature Range, Storage
Relative Humidity (MIL 202)

Notes

1

Includes nonlinearity, hysteresis, and repeatability.

2

Referenced to input.

3

Referenced to output.

–40°C to +85°C
–40°C to +85°C
0 to 95% @ 60°C noncondensing

MB36 Potentiometer Input Module 3-19

Table 3-8. MB36 Ordering Information

Input Range Output Range Model

0 to 100 Ω 0 to +5 V MB36-01
0 to 500 Ω 0 to +5 V MB36-02
0 to 1 kΩ 0 to +5 V MB36-03
0 to 10 kΩ 0 to +5 V MB36-04

MB37 Thermocouple Input Module

The MB37 thermocouple input module accepts input signals from types J,
K, T, E, R, S, and B thermocouples and provides a 0 to +5 V output.
Figure 3-5 on page 3-22 is a functional block diagram for the MB37.

Cold junction compensation circuitry corrects for the effects of the
parasitic thermocouples formed by thermocouple wire connections to the
input screw terminals. The compensator provides an accuracy of ±0.5°C
over the +5°C to +45°C ambient temperature range. A bias current
supplied through resistor R
open thermocouple. (Downscale open thermocouple detection can be
provided by installing a 50 MΩ resistor across screw terminals 1 and 3.
This resistor could be a 0.25 W carbon composition; ±20% tolerance is
suitable.)

gives a predictable upscale response to an

oc

A protection circuit assures safe operation even if a 240 V

power line is

rms

connected to the input screw terminals. A three-pole filter with a 4 Hz
cutoff provides 60 dB of NMR (Normal Mode Rejection) and CMR
enhancement at 60 Hz. (One pole of this filter is located at the module
input, while the other two poles are in the output stage for optimum noise
performance.) A chopper-stabilized input amplifier provides all of the
module’s gain and assures low drift. This amplifier operates on the input
signal after subtraction of a stable, laser-trimmed voltage, which sets the
zero-scale input value. Therefore, it is possible to suppress a zero-scale
input that is many times the total span to provide precise expanded scale
measurements.

3-20 MB Series Module Descriptions

Signal isolation is provided by transformer coupling using a proprietary
modulation technique for linear, stable performance. A demodulator on
the output side of the signal transformer recovers the original signal,
which is then filtered and buffered to provide a clean, low-impedance
output. A series output switch is included to eliminate the need for
external multiplexing in many applications. This switch has a low output
resistance and is controlled by an active-lo w enable input. In cases where
the output switch is not used, the enable input should be grounded to
power common to turn on the switch, as it is on the MB01 and MB05
backplanes.

The single +5 V supply powers a clock oscillator, which drives power
transformers for the input and output circuits. The input circuit is, of
course, fully floating. In addition, the output section acts as a third
floating port, eliminating many problems that might be created by ground
loops and supply noise. However, the common-mode range of the output
circuit is limited: output common must be kept within ±3 V of power
common.

Note: A current path to insure that the voltage from power common to

output common remains within ±3 V must exist for proper operation of
the demodulator and output switch.

MB37 Thermocouple Input Module 3-21

+EXC

HI

LO

-EXC

4

3

2

1

temp
sens

+2.5V

100 MΩ

4
(nc)

6

5

3

1

2

Roc

prot

prot

CJC

LPF

Vz

laser

adj ref

chopper

diff amp
+

-

rect &

filter

signal

isolation

power

isolation

active

LPF

2-pole

P. S .

power

osc.

20

19

22

17

16

Vout

I/O
COM

READ
EN (0)

+5 V

PWR
COM

Figure 3-5. MB37 Functional Block Diagram

Table 3-9 lists the specifications for the MB37 module. Note that
specifications are typical at 25°C and +5 V and are subject to change
without notice. Table 3-10 lists the ordering information for the MB37
module.

3-22 MB Series Module Descriptions

Table 3-9. MB37 Specifications

Specification MB37

Input Span Limits ±5 mV to ±0.5 V
Output Range 0 to +5 V

Accuracy

1,2

±0.05% span ±10 µV RTI ±0.05% (Vz) +

CJC Sensor, if applicable
Nonlinearity ±0.02% span
Stability vs. Ambient Temperature

Input Offset
Output Offset
Gain

1 µV/°C

±20 µV/°C

±25 ppm of reading/°C
Input Bias Current –25 nA
Input Resistance

Normal
Power Off
Overload

5 MΩ

40 kΩ

40 kΩ
Noise

Input, 0.1-10 Hz
Output, 100 kHz

0.2 µV

200 µV

rms

rms

RTI

RTO

Bandwidth, –3 dB 4 Hz
Rise Time, 10% to 90% Span 0.2 s
CMV, Input to Output

Continuous
Transient

1500 V

rms

max

meets IEEE-STD 472 (SWC)
CMR (50 or 60 Hz)

1 kΩ in Either or Both Input Leads 160 dB (all ranges)

NMR (50 or 60 Hz) 60 dB
Input Protection

Continuous 240 V

Output Resistance

3

50 Ω

max continuous

rms

Voltage Output Protection Continuous Short to Ground
Output Selection Time 20 µs

MB37 Thermocouple Input Module 3-23

Table 3-9. MB37 Specifications (cont.)

Specification MB37

Output Selection Input

Max Logic “0”
Min Logic “1”
Max Logic “1”

Input Current “0”
Open Input Response upscale
Open Input Detection Time 10 s

+1 V
+2.5 V
+36 V

0.4 mA

Cold Junction Compensation

Initial Accuracy

Over +5°C to +45°C

4

±0.25°C

±0.5°C (±0.0125°C/°C)
Power Supply V oltage +5 V ±5%
Power Supply Sensitivity ±2 µV/Vs% (RTI)
Power Consumption 150 mW (30 mA)
Size 2.25" x 2.25" x 0.60"

(52 mm x 52 mm x 15 mm)
Environmental

Temperature Range, Rated

–25°C to +85°C

Performance
Temperature Range, Storage
Temperature Range, Operating
Relative Humidity (MIL 202)
RFI Susceptibility

Notes

1

Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes

very high load resistance.

2

Vz is the nominal input voltage that results in a 0 V output.

3

The output resistance value can be used to determine gain error when the module is

–40°C to +85°C
–40°C to +85°C
0 to 95% @ 60°C noncondensing
±0.5% span error @ 400 MHz, 5 W, 3 feet

driving a resistive load. Ho we ver , loads heavier than 20 kΩ will de grade nonlinearity and
gain temperature coefficient.

4

When used with CJC-MB CJC sensor, which is provided on each channel of MB Series

backplanes and on the STA-1360.

3-24 MB Series Module Descriptions

Table 3-10. MB37 Ordering Information

Input Type Range Output

Range

Type J –100°C to +760°C (–148°F to +1400°F) 0 to +5 V MB37-J-01
Type K –100°C to +1350°C (–148°F to +2462°F) 0 to +5 V MB37-K-02
T ype T –100°C to +400°C (–148°F to +752°F) 0 to +5 V MB37-T-03
Type E 0 to +900°C (+32°F to +1652°F) 0 to +5 V MB37-E-04
Type R 0 to +1750°C (+32°F to +3182°F) 0 to +5 V MB37-R-05
Type S 0 to +1750°C (+32°F to +3182°F) 0 to +5 V MB37-S-05
Type B 0 to +1800°C (+32°F to +3272°F) 0 to +5 V MB37-B-06

Model

MB38 Strain Gauge Input Module

The MB38 wide bandwidth strain gauge input module accepts signals
from full-bridge and half-bridge 300 Ω to 10 kΩ transducers. The MB38
provides +10 V excitation and produces an output of –5 V to +5 V. This
module features a bandwidth of 10 kHz.

Figure 3-6 on page 3-26 is a functional block diagram of the MB38. A
protection circuit assures safe operation even if a 240 V

power line is

rms

connected to the input screw terminals. The excitation section provides
+10 V. Since the excitation lines are not sensed at the strain gauge, care
should be taken to minimize any IR loss in these wires. This can be
accomplished by the use of heavy gauge wires or the shortest length of
wire possible. A one-pole anti-aliasing filter is located at the module's
input, while a three-pole low-pass filter in the output stage sets the
bandwidth and yields optimum noise performance. A low-drift amplifier
provides the module's gain.

Signal isolation is provided by transformer coupling using a proprietary
modulation technique for linear, stable performance. A demodulator on
the output side of the signal transformer recovers the original signal,
which is then filtered and buffered to provide a clean, low-impedance
output. A series output switch is included to eliminate the need for
external multiplexing in many applications. This switch is controlled by

MB38 Strain Gauge Input Module 3-25

an active-low enable input. In cases where the output switch is not used,
the enable input should be grounded to power common to turn on the
switch, as it is on the MB01 and MB05 backplanes.

The single +5 V supply powers a clock oscillator, which drives power
transformers for the input and output circuits. The input circuit is fully
floating. In addition, the output section acts as a third floating port,
eliminating many problems that might be created by ground loops and
supply noise. However, the common-mode range of the output circuit is
limited: output common must be kept within ±3 V of power common.

The MB38 can be used with half-bridge transducers since the module
contains bridge completion circuitry. There is no provision for use with
quarter or three-quarter-bridge strain gauges. However, you may
complete the bridge to the half or full-bridge level external to the module
and use the MB38 module.

Note: A current path to insure that the voltage from power common to

output common remains within ±3 V must exist for proper operation of
the demodulator and output switch.

+EXC

4

3

2

1

-EXC

4

6

5

3

1 (nc)

2 (nc)

anti-aliasing

filter

prot

prot exc

source

chopper

diff amp
+

-

rect &

filter

signal

isolation

power

isolation

active

LPF

3-pole

P. S .

power

osc.

20

19

22

17

16

Vout

I/O
COM

READ
EN (0)

+5 V

PWR
COM

Figure 3-6. MB38 Functional Block Diagram

3-26 MB Series Module Descriptions

Table 3-11 lists the specifications for the MB38 module. Note that
specifications are typical at 25°C and +5 V and are subject to change
without notice.

Table 3-11. MB38 Specifications

Specification Full Bridge Half Bridge

Models MB38-02, MB38-05, MB38-07 MB38-04
Input Span Limits ±30 mV @ 3 mV/V Sensitivity

±30 mV @ 3 mV/V Sensitivity
±20 mV @ 2 mV/V Sensitivity
±100 mV @ 10 mV/V Sensitivity

Output Range –5 V to +5 V –5 V to +5 V
Accuracy

1

±0.08% span ±10 µV RTI ±0.08% span ± 1 mV RTI

Nonlinearity ±0.02% span ±0.02% span
Excitation Output

2

+10 V ± 3 mV +10 V ± 3 mV

Excitation Load Regulation ±5 ppm/mA ±5 ppm/mA
Half Bridge Voltage Level N/A (Excitation Voltage/2) ±1 mV
Stability vs. Ambient Temp.

Input Offset
Output Offset
Gain
Excitation Voltage
Half Bridge

1 µV/°C
±40 µV/°C
±25 ppm of reading/°C
±15 ppm/°C
N/A

1 µV/°C

±40 µV/°C

±25 ppm of reading/°C

±15 ppm/°C

±15 ppm/°C

Input Bias Current ±3 nA ±3 nA
Input Resistance

Normal
Power Off
Overload

20 MΩ minimum
40 kΩ minimum
40 kΩ minimum

20 MΩ minimum

40 kΩ minimum

40 kΩ minimum

Noise
Input, bandwidth = 10 Hz
Input, bandwidth = 10 kHz
Output, bandwidth =

0.4 µV

rms

RTI

±70 nV/√Hz RTI
10 mV p-p RTO

±2 µV

rms

RTI

±250 nV/√Hz RTI

10 mV p-p RTO

100 kHz
Bandwidth, –3 dB 10 kHz 10 kHz
Rise Time, 10% to 90% Span 40 µs 40 µs
Settling Time (to 0.1%) 250 µs 7 ms

MB38 Strain Gauge Input Module 3-27

Table 3-11. MB38 Specifications (cont.)

Specification Full Bridge Half Bridge

CMV, Input to Output

Continuous
Transient

1500 V

rms

max

meets IEEE-STD 472 (SWC)

1500 V

rms

max

meets IEEE-STD 472 (SWC)

CMR (50 or 60 Hz)

100 dB 100 dB

1 kΩ in either/both input

leads
Input Protection

Continuous 240 V

max continuous 240 V

rms

max continuous

rms

Output Resistance 50 Ω 50 Ω
Voltage Output Protection Continuous Short to Ground Continuous Short to Ground
Output Selection Time 20 µs 20 µs
Output Selection Input

Max Logic “0”
Min Logic “1”
Max Logic “1”
Input Current “0”

+1 V
+2.5 V
+36 V

0.4 mA

+1 V
+2.5 V
+36 V

0.4 mA
Power Supply Voltage +5 V ±5% +5 V ±5%
Power Supply Sensitivity 25 ppm reading/% ± 2.5 µV

RTI/%

25 ppm reading/% ± 2.5 µV

RTI/%
Power Consumption 1 W full load, 0.6 W no load 1 W full load, 0.6 W no load
Size 2.25" x 2.25" x 0.60"

(52 mm x 52 mm x 15 mm)

2.25" x 2.25" x 0.60"

(52 mm x 52 mm x 15 mm)
Environmental

Temp. Range, Rated

–25°C to +85°C

–25°C to +85°C

Performance
Temp. Range, Storage
Temp. Range, Operating
Relative Humidity (MIL

202)

RFI Susceptibility

–40°C to +85°C
–40°C to +85°C
0 to 95% @ 60°C noncondensing
±0.5% span error @ 400 MHz,
5W, 3 feet

–40°C to +85°C
–40°C to +85°C
0 to 95% @ 60°C
noncondensing
±0.5% span error @ 400 MHz,
5W, 3 feet

Notes

1

Includes combined effects of gain, offset/excitation errors, repeatability, hysteresis, and nonlinearity.

2

At full load (300 Ω).

3-28 MB Series Module Descriptions

Table 3-12 lists the ordering information for the MB38 module.

Table 3-12. MB38 Ordering Information

Input Bridge Range and Excitation Output

Range

Full Bridge 10.0 V excitation, @ 3 mV/V Sensitivity,

300 Ω to 10 kΩ

Half Bridge 10.0 V excitation, @ 3 mV/V Sensitivity,

300 Ω to 10 kΩ

Full Bridge 10.0 V excitation, @ 2 mV/V Sensitivity,

300 Ω to 10 kΩ

Full Bridge 10.0 V excitation, @ 10 mV/V Sensitivity,

300 Ω to 10 kΩ

–5 V to +5 V MB38-02

–5 V to +5 V MB38-04

–5 V to +5 V MB38-05

–5 V to +5 V MB38-07

MB39 Current Output Module

The MB39 current output module accepts a high level analog signal at its
input and provides a galvanically-isolated 4-20 mA or 0-20 mA process
current signal at its output. The module features high accuracy of ±0.05%,
±0.02% nonlinearity and 1500 V
protection.

common mode voltage isolation

rms

Model

Figure 3-7 on page 3-31 is a functional block diagram of the MB39
current output module. The voltage input, usually from a digital-to-analog
converter, is buffered and a quarter scale offset is added if a 4-20 mA
output is specified.

The signal is latched in a track-and-hold circuit. This track-and-hold
allows one DAC to serve numerous output channels. The output droop
rate is 80 µA/s, which corresponds to a refresh interval of 25 ms for

0.01% FS droop. The track-and-hold is controlled by an active-lo w enable
input. On power-up, the output of the MB39 remains at 0 mA for
approximately 100 ms, allowing the user to initialize the track-and-hold.

MB39 Current Output Module 3-29

In conventional applications where one DAC is used per channel and the
track-and-hold is not used, the enable input should be grounded to power
common, as it is on the MB01 and MB05 backplanes. This keeps the
module in tracking mode.

The signal is sent through an isolation barrier to the current output (V-to-I
converter) stage. Signal isolation is provided by transformer coupling
using a proprietary modulation technique for linear, stable performance.
A demodulator on the output side of the signal transformer recovers the
original signal, which is then filtered and converted to a current output.
Output protection allows safe operation even in the event of a 240 V

rms

power line being connected to the signal terminals.

A single +5 V supply powers a clock oscillator, which drives power
transformers for the input circuit and the output’s high-compliance,
current loop supply. The output current loop is, of course, fully floating.
In addition, the input section acts as a third floating port, eliminating
many problems that might be created by ground loops and supply noise.
However, the common-mode range of the input circuit is limited: input
common must be kept within ±3 V of power common.

Note: A current path to insure that the voltage from power common to

output common remains within ±1 V must exist for proper operation of
the demodulator and output switch.

The 0 to 20 mA output of a MB39-04 can be converted to a 0 to 10 V
output by dropping a 500 Ω resistor across the output terminals.

This voltage output should be used cautiously. Since it is not a true
voltage source, the tolerance of the resistor and load impedances that are
not large relative to the conversion resistor will introduce errors. A load
impedance > 500 kΩ would contribute < 0.1% error.

3-30 MB Series Module Descriptions

Vin

I/O

COM

WRITE

EN (0)

+5 V

PWR
COM

18

19

23

17

16

4

3

6

2

5

1

V/C

input
range

select

power

osc.

track

&

hold

P. S .

signal

isolation

prot

power

isolation

rect &

filter

Figure 3-7. MB39 Functional Block Diagram

Table 3-13 lists the specifications for the MB39 module. Note that
specifications are typical at 25°C and +5 V and are subject to change
without notice. Table 3-14 lists the ordering information for the MB39
module.

OUT HI

OUT LO

MB39 Current Output Module 3-31

Table 3-13. MB39 Specifications

Specification MB39

Standard Input Ranges 0 to +5 V or –5 V to +5 V
Standard Output Ranges 4-20 mA or 0-20 mA

Load Resistance Range
Accuracy

2

1

0 to 650 Ω
±0.05% span

Nonlinearity ±0.02% span
Stability vs. Ambient Temperature

Zero
Span

±0.5 µA/°C

±20 ppm of reading/°C
Output Ripple, 100 Hz bandwidth 30 µA peak-peak
Common Mode Voltage

Output to Input and Power Supply 1500 V

continuous

rms

Common Mode Rejection 90 dB
Normal Mode Output Protection 240 V

continuous

rms

Output Transient Protection Meets IEEE-STD 472 (SWC)
Sample & Hold:

Output Droop Rate
Acquisition Time

80 µA/s

50 µs
Overrange Capability 10%
Maximum Output Under Fault 26 mA
Input Resistance 10 MΩ
Bandwidth, –3 dB 400 Hz
Rise Time, 10% to 90% Span 2 ms
Track-and-Hold Enable

Max Logic “0”
Min Logic “1”
Max Logic “1”
Input Current “0”

+1 V

+2.5 V

+36 V

1.5 mA
Power Supply +5 Vdc ±5%
Power Supply Sensitivity ±0.25 µA/Vs%

3-32 MB Series Module Descriptions

Table 3-13. MB39 Specifications (cont.)

Specification MB39

Power Consumption 0.85 W (170 mA)
Maximum Input Voltage Without Damage –10 V to +10 V
Size 2.25" x 2.25" x 0.60"

(52 mm x 52 mm x 15 mm)

Environmental

Temperature Range, Rated

Performance
Temperature Range, Operating
Temperature Range, Storage
Relative Humidity (MIL 202)
RFI Susceptibility

Notes

1

With a minimum power supply voltage of 4.95 V, RL can be up to 750 Ω.

2

Includes the combined effects of repeatability, hysteresis, and nonlinearity.

–25°C to +85°C

–40°C to +85°C
–40°C to +85°C
0 to 95% @ 60°C noncondensing
±0.5% span error @ 400 MHz, 5W, 3 feet

Table 3-14. MB39 Ordering Information

Input Range Output Range Model

0 to +5 V 4-20 mA MB39-01
–5 V to +5 V 4-20 mA MB39-02
0 to +5 V 0-20 mA MB39-03
–5 V to +5 V 0-20 mA MB39-04

MB39 Current Output Module 3-33

MB40 and MB41 Wide Bandwidth Millivolt/Volt Input Modules

The MB40 wide bandwidth millivolt input module accepts ±5 mV to
±100 mV input signals and provides either a –5 V to +5 V or 0 to +5 V
output. The MB41 wide bandwidth voltage input module accepts ±1 V to
±40 V input signals and provides either a –5 V to +5 V or 0 to +5 V
output. Both modules feature a 10 kHz bandwidth.

Figure 3-8 on page 3-35 is a functional block diagram of the MB40 and
MB41. A protection circuit assures safe operation even if a 240 V
power line is connected to the input, and, in the MB41, the signal is
attenuated by a factor of 20 at this point. A one-pole anti-aliasing filter is
located at the module’s input, while a three-pole low-pass filter in the
output stage sets the bandwidth and yields optimum noise performance. A
low-drift input amplifier provides all of the module’s gain. This amplifier
operates on the input signal after subtraction of a stable, laser-trimmed
voltage, which sets the zero-scale input value. Therefore, it is possible to
suppress a zero-scale input that is many times the total span to provide
precise expanded scale measurements.

Signal isolation is provided by transformer coupling using a proprietary
modulation technique for linear, stable performance. A demodulator on
the output side of the signal transformer recovers the original signal,
which is then filtered and buffered to provide a clean, low-impedance
output. A series output switch is included to eliminate the need for
external multiplexing in many applications. This switch has a low output
resistance and is controlled by an active-lo w enable input. In cases where
the output switch is not used, the enable input should be grounded to
power common to turn on the switch, as it is on the MB01 and MB05
backplanes.

rms

A single +5 V supply powers a clock oscillator that drives power
transformers for the input and output circuits. The input circuit is, of
course, fully floating. In addition, the output section acts as a third
floating port, eliminating many problems that might be created by ground
loops and supply noise. However, the common-mode range of the output
circuit is limited: output common must be kept within ±3 V of power
common.

3-34 MB Series Module Descriptions

Note: A current path to insure that the voltage from power common to

output common remains within ±3 V must exist for proper operation of
the demodulator and output switch.

Vin

+EXC

HI

LO

-EXC

prot (&

20x

atten

MB41

only)

anti-aliasing

filter

laser

Vz

adj ref

chopper
diff amp

+

-

rect &

filter

signal

isolation

power

isolation

active

LPF

3-pole

P. S .

power

osc.

20

19

22

17

16

Vout

I/O
COM

READ
EN (0)

+5 V

PWR
COM

4

4 (nc)

3

6

2

5

1

3 (nc)

1(nc)

2 (nc)

Figure 3-8. MB40 and MB41 Functional Block Diagram

T able 3-15 lists the specifications for the MB40 and MB41 modules. Note
that specifications are typical at 25°C and +5 V and are subject to change
without notice. Table 3-16 lists the ordering information for the MB40
and MB41 modules.

MB40 and MB41 Wide Bandwidth Millivolt/Volt Input Modules 3-35

Table 3-15. MB40 and MB41 Specifications

Specification MB40 MB41

Input Span Limits ±5 mV to ±100 mV ±1 V to ±40 V
Output Ranges –5 V to +5 V or 0 to +5 V –5 V to +5 V or 0 to +5 V

Accuracy

1,2

±0.05% span ±10 µV RTI

±0.05% span ±0.05% (Vz)

±0.05% (Vz)

Nonlinearity ±0.02% span ±0.02% span
Stability vs. Ambient

Temperature

Input Offset
Output Offset
Gain

±1 µV/°C
±40 µV/°C
±25 ppm of reading/°C

±20 µV/°C
±40 µV/°C

±50 ppm of reading/°C
Input Bias Current ±3 nA ±0.2 nA
Input Resistance

Normal
Power Off
Overload

200 MΩ
40 kΩ
40 kΩ

650 kΩ

650 kΩ

650 kΩ
Noise

Input, 0.1-10 Hz

0.4 µV

rms

RTI

2 µV

rms

RTI

Output

Vi=±FS
Vi=0

20 mV, peak-peak
10 mV, peak-peak

20 mV, peak-peak

10 mV, peak-peak
Bandwidth, –3 dB 10 kHz 10 kHz
Rise Time, 10% - 90% span 35 µs 35 µs
CMV, Input to Output

Continuous
Transient

1500 V

rms

meets IEEE-STD 472 (SWC)

1500 V

rms

meets IEEE-STD 472 (SWC)
CMR (50 or 60 Hz)

1 kΩ source unbalance 100 dB (all ranges) 90 dB

Input Protection

Continuous
Transient

Output Resistance

3

240 V

rms

meets IEEE-STD 472 (SWC)

240 V

meets IEEE-STD 472 (SWC)

50 Ω 50 Ω

rms

Voltage Output Protection Continuous Short to Ground Continuous Short to Ground

3-36 MB Series Module Descriptions