Omega Products CIO-EXP-BRIDGE16 Installation Manual
CIO-EXP-BRIDGE16
User’s Manual
© Copyright 2001,
Revision 2
January, 2001
OMEGA ENGINEERING INC.
Table of Contents
1 INTRODUCTION
2 SOFTWARE INSTALLATION
3 GENERAL CONFIGURATION
3.1 A/D Board Type Select Jumper
3.2 Setting The Output Channel
3.3 Configuring the A/D Board
3.3.1 DAS08 Family Setup
3.3.2 DAS16 Family Setup
3.3.3 All A/D Boards
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3.4 CONNECTING THE CIO-EXP-BRIDGE16 TO THE A/D BOARD
3.4.1 Connecting to a DAS08 Series A/D Board
3.4.2 Connecting to a DAS16 Series A/D Board
3.4.3 Other A/D Boards
3.5 Powering The CIO-EXP-BRIDGE16
3.5.1 Power Source Switch
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3.5.2 Powering with the 37-pin Connector
3.5.3 Powering with the Molex Connector
3.5.4 Powering Through the Power Screw Terminals
3.6 Daisy-Chaining CIO-EXP-BRIDGE16 Boards
3.7 Connecting a Test Voltage
3.8 Verifying The Installation
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4 CONFIGURATION FOR VOLTAGE MEASUREMENT
4.1 Channel Selection
4.2 Powering the CIO-EXP-BRIDGE16
4.3 Determining The Appropriate Gain
4.4 Setting the Gain
4.4.1 Setting Board Gain
4.4.2 Setting Channel Gain
4.5 Attenuation
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4.6 Connecting Voltage Signals
4.6.1 Single Ended
4.6.2 Floating Differential
4.6.3 Fully Differential
4.7 Verifying the Installation
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5 CONFIGURATION FOR RESISTANCE MEASUREMENT
5.1 Channel Select
5.2 VEXC Jumper Select
5.3 Powering The CIO-EXP-BRIDGE16
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5.3.1 Selecting the Power Source for the Board
5.3.2 Selecting the Power Source for the Excitation Voltage
5.3.3 Selecting the Excitation Voltage
5.4 Determining the Appropriate Gain
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5.5 Setting the Gain
5.5.1 Setting Board Gain
5.5.2 Setting Channel Gain
5.6 Configuring the Bridge
5.6.1 Bridge Completion Resistors
5.6.2 Nulling Potentiometers & Arm Resistor
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5.6.3 Strain Gauge Bridge Configuration Examples
6 SPECIFICATIONS
7 APPENDIX
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7.1 About Strain Gauges
7.1.1 What Are Strain Gauges?
7.1.2 Specification of Strain Gauges
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7.2 Reference Material for Application of Strain Gauges
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1 INTRODUCTION
The CIO-EXP-BRIDGE16 is a signal conditioning accessory designed for use with the DAS08 and
DAS16 family of data acquisition boards. The CIO-EXP-BRIDGE16 contains circuitry to condition
strain gauge sensors on a per channel basis and convert the sensor's output to a voltage suitable for
conversion by a DAS08 or other analog-to-digital conversion board.
This manual is organized into sections that explain the CIO-EXP-BRIDGE16 as follows:
Software Installation All users should review this section regardless of the
application.
General Configuration: All users should review this section regardless of the
application.
Configuration for Voltage Measurement: Users interested in voltage measurement applications
should review this section.
Configuration for Resistance Measurement: Users interested in resistance or strain gauge
measurement applications should review this section.
Please read the manual carefully. There are many optional resistors, jumpers and other connections to be
made on the CIO-EXP-BRIDGE16. Failure to set up the channels correctly will frustrate you with
inaccurate measurements.
2 SOFTWARE INSTALLATION
Software is not included with the CIO-EXP-BRIDGE16, but each of the data acquisition boards with
which it is intended to be used includes software called InstaCal™ that may be used to aid installation,
verify operation and perform calibration of the CIO-EXP-BRIDGE16. The disk or CD labeled InstaCal
contains this software package. If you ordered the Universal Library™, you should load InstaCal from
that CD or disk set.
The board has a variety of switches and jumpers to set before installing the board in your computer.
InstaCal will show you all available options, how to configure the various switches and jumpers to match
your application requirements, and will create a configuration file that your application software (and the
Universal Library) will refer to so the software you use will automatically have access to the exact
configuration of the board.
Please refer to the Software Installation Manual regarding the installation and operation of InstaCal. Use
InstaCal along with the following hard copy information to set the hardware configuration of the board.
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3 GENERAL CONFIGURATION
C
3.1 A/D Board Type Select Jumper
The CIO-EXP-BRIDGE16 may be used with either DAS08 or DAS16 family boards because the signal
assignments of the 37-pin connectors match those of the DAS08, and may be adapted to those of the
DAS16 with a C-EXP2DAS16-10 cable. Select the A/D board type via the JB10 jumper.
Jumper JB10 on the CIO-EXP-BRIDGE16, located near the 37-pin connector,
selects the A/D board family as DAS08 or DAS16.
Figure 3-1 shows the jumper set to use the CIO-EXP-BRIDGE16 with a
CIO-DAS08 family board.
'$6
Figure 3-1
DAS08/16 Select
3.2 Setting The Output Channel
Jumpers labeled “CH SEL” located near the 37-pin connector select the A/D board channel that the
output from the active sensor will be connected to. There are 16 jumper positions for outputs, each
corresponding to one of the 16 output pins on the 37-pin connectors. When the board is connected to a
DAS08, only the first eight channels (labeled 0-7) can be used. When the board is connected to a DAS16,
any one of the 16 jumper positions can be selected. In each case, the jumper position corresponds to a
channel number on the A/D board. See Figure 3-2.
37-Pin
ONNECTOR
37
36
35
34
33
32
31
30
18
17
16
15
14
13
12
11
10
9
8
7
MUX ADDR 4
MUX ADDR 3
MUX ADDR 2
MUX ADDR 1
OUTPUT CHANNEL
SELECT JUMPER
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
AMP
GAIN
1 OR 2.5
8-CHANNEL MULTI P LEXER
8-CHANNEL MULTI P LEXER
INPUT 0
INPUT 1
INPUT 2
INPUT 3
INPUT 4
INPUT 5
INPUT 6
INPUT 7
INPUT 8
INPUT 9
INPUT 10
INPUT 11
INPUT 12
INPUT 13
INPUT 14
INPUT 15
'$6
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Figure 3-2. Output Channel Jumper
JB6
CH SEL
JB16
Figure 3-3 is a diagram of the Channel Select jumper
blocks shown using channel 0 of the A/D board.
12345670
CHANNEL 0 SELECTED FOR SENSOR OUTPUT
8 9 10 1112 14 1513
Figure 3-3. Output Channel Select Jumpers
Place the jumper on the pin which corresponds to the A/D board's input channel.
A second set of jumpers is marked VEXC SEL (excitation voltage select). This jumper connects the
excitation voltage used for the bridge excitation to one of the A/D channels for monitoring. Installation
of this jumper is optional. If you decide to monitor excitation voltage, make sure you install this jumper
on a different channel number than that selected for the CH SEL jumper.
One individual channel must be selected for each bank of 16 EXP channels. For example, if you are
using several CIO-EXP-BRIDGE16 boards, the jumper setting for each board must be unique. If you
select channel 0 for the first board, do not use this channel for any of the other boards.
3.3 Configuring the A/D Board
3.3.1 DAS08 Family Setup
The input mode of the A/D board must be single-ended to be compatible with the CIO-EXP outputs.
Some of the boards in the DAS08 series have differential inputs that can be converted to single-ended
inputs. See the information shipped with your A/D board for conversion to single-ended inputs.
3.3.2 DAS16 Family Setup
The input mode of the A/D board must be single-ended to be compatible with the CIO-EXP outputs.
Most of the DAS16 series is switch selectable for either 8 differential or 16 single ended inputs. When
used with the CIO-EXP, set the switch to 16 channel, single-ended mode.
3.3.3 All A/D Boards
If you are using an A/D board with switch - selectable ranges, consider the application and determine the
best fit for range vs. expected voltage. For example, when measuring resistance such that the output of
the EXP board is expected to be in the range of 3 to 4.5 Volts, a unipolar 5V range would be the best
choice.
If the range on your A/D board is fully programmable, the software you use for measurement will
determine the range.
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3.4 CONNECTING THE CIO-EXP-BRIDGE16 TO THE A/D BOARD
3.4.1 Connecting to a DAS08 Series A/D Board
A CIO-DAS08 series board may be connected directly through a C37FF series cable from the P1
connector on the CIO-EXP-BRIDGE16 to the A/D analog connector. The JB10 jumper should be left in
the DAS08 position as set at the factory.
3.4.2 Connecting to a DAS16 Series A/D Board
Connection to a DAS16 series board requires a special 37-conductor cable (C-EXP2DAS16-10) since pin
relationship of CIO-EXP and DAS16 signals is not 1:1.
Install the C-EXP2DAS16-10 cable connector labeled “MUX” into the P1 connector of the
CIO-EXP-BRIDGE16 board and the other end into the DAS16 series board’s analog connector.
3.4.3 Other A/D Boards
For other boards, use this connector diagram
(Figure 3-4) to construct a cable or call us and
discuss the possibility of a custom- manufactured
cable.
The signals from the CIO-EXP-BRIDGE16 are
voltages from each channel and an analog ground.
There should be no voltage between analog
ground and power ground.
The MUX address lines control the setting of the
input channel multiplexer(s). When all are low,
the mux is set to Input 0. The lines are binary
coded where MUXADDR1 is the LSB and
MUXADDR4 is the MSB.
A jumper (CH SEL) selects which output channel
is read by the DAS08 or DAS16 board.
NC / LLGND
LLGND / OUTPUT 8
OUTPUT 9
OUTPUT 10
OUTPUT 11
OUTPUT 12
OUTPUT 13
OUTPUT 14
OUTPUT 15
MUX ADDR 4
MUX ADDR 3
MUX ADDR 2
MUX ADDR 1
NC
NC
NC
NC
NC
NC
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18
17
16
15
14
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5
4
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2
1
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
OUTPUT 0
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
OUTPUT 6
OUTPUT 7
+5 VOLTS FROM PC
POWER GROUND
NC
NC
NC
NC
NC
NC
NC
NC
Figure 3-4. 37-Pin Output Connector Pinout
3.5 Powering The CIO-EXP-BRIDGE16
The CIO-EXP-BRIDGE16 can be powered through the 37-pin cable, the power screw terminal or the
Molex connector. The power that can be carried through the 37-pin connector is limited so we
recommend using this source only when a single CIO-EXP-BRIDGE16 is used.
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The power required to run a CIO-EXP-BRIDGE16 is dependent on the board configuration. Remember
that additional power will be drawn when the CIO-EXP-BRIDGE16 is configured for resistance
measurement (bridge configuration) due to the current required for each bridge.
3.5.1 Power Source Switch
One of the switches on the eight-position DIP switch (S17)
near the output channel jumpers controls the source of the
+5V power to the CIO-EXP-BRIDGE16. Shown in Figure
3-5, it is the 3rd switch from the left.
When positioned down (ON, +5 COMP), +5V power is
drawn from the personal computer through the signal cable.
X1
REM
S17
When positioned up (OFF, REM) , +5V power is taken from
the optional external 5V power connector (the Molex
10V
4V
+5 COMP
X2.5
GND
2V
1V
0.5V
connector labeled P19) or the +5V screw terminal
connection.
Figure 3-5. Power Source Switch & Jumper
3.5.2 Powering with the 37-pin Connector
You can power the CIO-EXP-BRIDGE16 via the 37-pin cable. No more than one CIO-EXP-BRIDGE16
should be powered using the 37-pin cable.
This option is not available when using some A/D boards. If the A/D board you are using supplies +5V
at pin 29 (or at pin 1 when using the C-EXP2DAS16 signal cable), you can power the
CIO-EXP-BRIDGE16 through the 37 pin connector by setting the power select switch on S17 to “+5
COMP”.
3.5.3 Powering with the Molex Connector
The CIO-EXP-BRIDGE16 can be powered off the PC's power supply by connecting the optional external
5V power connector (the Molex connector labeled P19) to the PC’s power supply through a
C-MOLEX-10 cable. This cable has the same Molex connector that is used inside the PC and so can be
connected directly to the PC's power supply through one of the spare connectors. The cable is keyed, so
it should not be forced. When inserted properly it will slide easily and snap in place.
3.5.4 Powering Through the Power Screw Terminals
A set of screw terminals labeled +5V and GND are located next to the 37-pin connector, P2. You can
power the CIO-EXP-BRIDGE16 from a +5V ±5% power supply capable of at least 400 mA. For this
option, set the power select switch on S17 to “REM”.
CAUTION: The ground of the power supply and the ground of the personal computer should be tied
together through a heavy gauge wire. If you do not strap the two grounds together, a voltage difference
between theses grounds will affect measurements. If the potential exceeds the protection range of the
input circuits, the board may be damaged.
At this time, ignore the other screw terminals located next to the power and ground terminals. They are
needed only with certain sensors and will be explained in those sections.
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3.6 Daisy-Chaining CIO-EXP-BRIDGE16 Boards
Connect one CIO-EXP-BRIDGE16 to another using a C37FF-# ribbon cable. Connect from P2 on the
‘upstream’ board to P1 on the ‘downstream’ board. Make sure each of the boards in the chain have a
unique channel selected (CH SEL jumper is set to a different number on each board).
3.7 Connecting a Test Voltage
Make your initial test of the CIO-EXP-BRIDGE16 with a voltage signal of between -5 and 5V. If you
use an AC signal source, keep the frequency below 70Hz to avoid attenuation by the
CIO-EXP-BRIDGE16’s low pass filter. Each bridge input circuit has four screw terminals. These
terminals are shown in Figure 3-6 below.
To connect a voltage signal to the input circuit, connect the voltage to the
screw terminals as follows:
+SENSE: Connect to + voltage.
−
SENSE : Jumper this to −P.
−
P: Connect to ground.
+P: No connection.
+P
−
SENSE
CH0
+SENSE
−
P
Figure 3-6.
Input Screw Terminal Strip
The four screw terminals associated with each input circuit are labeled on the CIO-EXP-BRIDGE16 as
follows:
+SENSE High side of input
-P Excitation voltage return
-SENSE Low side of input
+P Excitation voltage
The use of the terminals is dependent on the type of sensor you have connected to the input circuit. The
nomenclature on the terminals has been chosen to be appropriate for bridge sensors.
3.8 Verifying The Installation
For verification of the installation, leave any switches or jumpers not mentioned above in their default
positions. Each of the gain switches (CH0 through CH15 and S17-7) should be off (toward the upper
edge of the board) for a gain of X1 (unity gain).
To verify the installation, use the InstaCal program installed on your computer. This software came with
your A/D board if you bought the board from the same manufacturer as the CIO-EXP-BRIDGE16. If
your A/D board is not from the same manufacturer but is compatible, please call technical support and
request a copy of InstaCal.
Use InstaCal's TEST option to verify that a signal present at one of the CIO-EXP-BRIDGE16 inputs can
be read. You will not need to set any jumpers other than those previously mentioned, and should not set
any switches or install any passive components until you have verified the installation.
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