B&B Electronics SDAIBB User Manual

4 Channel Input Buffer Board

Model SDAIBB

Document No. SDAIBB1300

This product designed and manufactured in Ottawa, Illinois USA

of domestic and imported parts by

International Headquarters

B&B Electronics Mfg. Co. Inc. USA

707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350

Phone [phone] -- General Fax [phone]

Home Page: www.bb-elec.com

Sales e-mail: [e-mail]

Technical Support e-mail: [e-mail]

1999 B&B Electronics



August 1999 B&B Electronics RESERVED. No part of this publication may be reproduced or transmitted in



any form or by any means, electronic or mechanical, including photography, recording, or any information
storage and retrieval system without written consent. Information in this manual is subject to change without
notice, and does not represent a commitment on the part of B&B Electronics.

B&B Electroni cs shall no t be liable for incidental or consequential damages resulting from the furnishing,
performance, or use of this manual.

All brand names used in this manual are the registered trademarks of their respective owners. The use of
trademarks or other designations in this publication is for reference purposes only and does not constitute an
endorsement by the trademark holder.

-- Fax [phone]

-- Fax [phone]

SDAIBB1300 Manual Cover Page

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

Table of Contents

CHAPTER 1: GENERAL INFORMATION...........................................1

NTRODUCTION

I

PECIFICATIONS

S

.........................................................................................1

........................................................................................1

CHAPTER 2: CONNECTIONS...............................................................3

OWER SUPPLY CONNECTIONS

P

NPUT VOLTAGE CONNECTIONS

I

UTPUT VOLTAGE CONNECTIONS

O

.................................................................3

................................................................5

.............................................................6

CHAPTER 3: CONFIGURATION..........................................................9

UTPUT OFFSET

O

AIN SELECTION

G

........................................................................................9

.......................................................................................9

Maximum Gain...................................................................................11

Gain Resistor Determination.............................................................12

Maximum and Minimum Common Mode Voltage..............................13

Maximum Differential........................................................................14

Example Board Setup.........................................................................15

APPENDIX A: GLOSSARY.................................................................A-1

APPENDIX B: ERROR BUDGET CALCULATIONS......................B-1

MPORTANT SPECS

I

RROR CONTRIBUTIONS THAT CAN BE REMOVED WITH CALIBRATION

E

RROR CONTRIBUTIONS THAT CANNOT BE REMOVED W/CALIBRATION

E

@ 25°C:.................................................................B-1

.B-1

B-1

SDAIBB1300 Manual Table of Contents i

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

Chapter 1: General Information

Introduction

The SDAIBB is a data acquisition module with four input buffers
with selectable gains and selectable output offsets. The gain can be set
from 1 to 1000 with a single resistor change. Gains of 1 and 22.28 are
provided. The output can be offset by the provided 0 V for positive ended
systems, by the provided 2.5 V for plus/minus applications, or by a user
selected amount that i s brought in on terminal blocks or solder pads. The
SDAIBB is designed to amplify single ended or differential signals in the
range of –0.15 to +5.0 V into +0.01 to +5.0 V signals that are compatible
with the B&B line of data acquisition products. Sensor and power supply
connections ar e made through terminal blocks or solder pads. A/D
connections ar e made through DB25 connectors and are desi gned to
connect to many of the B&B data acquisition products. All lines on the
DB25 connectors are c arried through, allowing boards to be “stacked” for
expanding the number of channels or bringing other lines in or out. Three
SDAIBB boards will fill all 11 channels of the 232SDAxx or 485SDAxx
modules.

Specifications

Number of Channels 4
Gain 1 to 1000

1 and 22.28 provided
Max. Gain Error 0.35%
Max. Gain Drift 25 ppm
Max. Input Offset Voltage 200 µV

Max. Input Offset Voltage Drift 2 µV/°C
Input Impedance 2 GΩ, 2pF
Input Voltage Range

Gain = 1 -0.15 to +5.00 V
Gain > 1 -0.15 to +4.60 V

Output Voltage Range

Gain = 1 0.01 to 5.00 V
Gain > 1 0.01 to 4.95 V

SDAIBB1300 Manual 1

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

Power Supply

Input Voltage

Single Module 10 to 30 VDC

Three Modules 12 to 30 VDC
Input Current 8 mA max. per Module
Current Draw From Precision 5 V 0.5 mA per board
Max. Current Throughput 1 A

Connections

Analog Input Terminal Blocks/Solder Pads
Analog Output DB25 Male Connector and
DB25 Female Connector
Power Terminal Blocks/Solder Pads

Pins 2 and 7 of the Male
DB25

Environment

Operating Temperature -40 to +85 °C
Storage Temperature -65 to +125 °C

5.6 x 2.75 in.

Size

14 x 7 cm

2 SDAIBB1300 Manual

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

Chapter 2: Connections

Power Supply Connections

A single SDAIBB board requires 8 mA at 10 to 30 VDC, and can be
brought directly into the board through terminal blocks or sol der pads
marked POWER and GND or passed from another board connected to the
male side of the board. See Figure 1 for a system where the power is
brought directly onto the board. When passing power thro ugh from
another board, POWER is carried through on pin 2 and GND is carried
through on pin 7 . Powers flows in on the male DB25 co nnector and out on
the female DB25 connector with a 0.5 VDC drop across the board. This
allows multiple boards to be powered with a single power supply by
cascading them. See Table 4 for a list of B&B data acquisition products
that carry power t hrough on pins 2 a nd 7. Using these devices, you can
power an entire system with a single power supply as shown in Figure 2.

Power Supply

Port Powered

MODEL 232SDA10

D ATA A C QU IS ITION

Otta w a , Illin o is 6 1 35 0

MOD ULE

RS-232

GND

OFF.

OUT.

GAIN

R8

1

22.28/

USER

JP8

JP4

I/O P OR T

JP9

JP10

JP11

IN-

POWER

2.5V

0V

TB5

TB4

R2

TB2

JP6

22.28/U SE R

1

0V

2.5V

JP2

OFF.

OUT.

OFF

OUT

GAIN

OFF.

OUT.

IN+

GND

OFF

OUT

IN-

2.5V

0V

JP7

TB3

D

B

0V

2.5V

JP5

OFF.

OUT.

IN-

GND

OUT

IN+

GAIN

JP3

1

OFF

IN+

GND

OUT

22.28/

R7

USER

C

A

TB1

USER

22.28/

1

R1

JP1

IN-

GAIN

GND

IN+

OFF

Figure 1: Port Powered SDA and Powered Board

SDAIBB1300 Manual 3

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

Power

N

IO

2

3

-2

E

L

U

IT

IS

U

Q

C

0

5

3

1

6

s

i

o

n

i

ll

I

I/O PORT

S

R

D

O

M

A

A

,

a

w

a

t

t

MODEL 232SDA10

T

A

D

O

GAIN

GAIN

GAIN

JP9

JP10

JP11

JP2

OUT.
OFF.

OUT
OFF

GND
IN+
IN-

OUT.
OFF.

OUT
OFF

GND
IN+
IN-

GAIN

JP9

JP10

JP11

JP2

OUT.
OFF.

OUT
OFF

GND
IN+
IN-

OUT.
OFF.

OUT
OFF

GND
IN+
IN-

GAIN

JP9

JP10

JP11

JP2

OUT.
OFF.

OUT
OFF

GND
IN+
IN-

OUT.
OFF.

OUT
OFF

GND
IN+
IN-

GAIN

R8

USER

1

22.28/

JP4

GAIN

JP8

0V

OUT.

22.28/USER

1

R2

0V

2.5V

JP6

TB2

B

JP5

0V

2.5V

A

TB1

JP1

22.28/

1

USER

R1

22.28/USER

1

R2

0V

2.5V

JP6

TB2

B

JP5

0V

2.5V

A

TB1

JP1

22.28/

1

USER

R1

22.28/USER

1

R2

0V

2.5V

JP6

TB2

B

JP5

0V

2.5V

A

TB1

JP1

22.28/

1

USER

R1

2.5V

TB5

TB4

D

0V

JP7

2.5V

TB3

C

22.28/
USER

R7

R8

USER

1

22.28/

JP4

JP8

0V

2.5V

TB5

TB4

D

0V

JP7

2.5V

TB3

C

22.28/
USER

R7

R8

USER

1

22.28/

JP4

JP8

0V

2.5V

TB5

TB4

D

0V

JP7

2.5V

TB3

C

22.28/
USER

R7

Board 1

OFF.

POWER

GND

IN­IN+
GND
OFF

OUT

OUT.
OFF.

IN­IN+
GND
OFF

OUT

JP3

GAIN

1

GAIN

OUT.

Board 2

OFF.

POWER

GND

IN­IN+
GND
OFF

OUT

OUT.
OFF.

IN­IN+
GND
OFF

OUT

JP3

GAIN

1

GAIN

OUT.
OFF.

Board 3

POWER

GND

IN­IN+
GND
OFF

OUT

OUT.
OFF.

IN­IN+
GND
OFF

OUT

JP3

GAIN

1

Figure 2: Single Power Supply System with 11 Channels Supported

4 SDAIBB1300 Manual

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

Input Voltage Connections

The SDAIBB can receive signals in the range of –0.15 to +5 VDC

when set to unity gain, and –0.15 to +3.5 VDC when set to any other gain.

Note: This voltage reading is taken from GND on the SDAIBB to
Input+ and GND to Input- voltage s. It is
from Input- to Input+.

blocks or solder pads. The terminal blocks are labeled Input+, Input-,
GND, and Output Offset. See Figures 3, 4, and 5 for typical input
configurations. The voltage that will be amplified is the reading taken from
Input- to Input+. GND is connected to the ground of the SDAIBB and is
provided for making a common reference for the SDAIBB and the input
device. The Output Offset is an input that shifts the output of the SDAIBB.
This feature is discussed further in Chapter 3, Output Offset.

Signals are brought into the buffer by terminal

Figure 3: Differential Signal with GND

not

the differential voltage

OUT
OFF

GND
IN+

IN-

OUT
OFF

GND

Signal

IN+

GND

Figure 4: Single Ended Signal

SDAIBB1300 Manual 5

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

IN-