CUSTOM CONFIGURABLE SIGNAL CONDITIONING MODULES
SignalPro
Signal Conditioning System
Users Manual
OMEGA ENGINEERING, INC. Tel: (203) 359-1660
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P.O. Box 4047 Toll free:1-800-826-6342
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Table of Contents
29
4.3.4 Differential Thermocouple Measurements
............................
29
4.3.3 Single Ended Thermocouple Measurements
...........................
29
4.3.2 Software Zero Correction
...........................................
28
4.3.1 Cold Junction Compensation (CJC) Sensor
............................
28
4.3 Basic Principles
....................................................
26
4.2.2 QTC-200T Terminal Board Configuration
.............................
26
4.2.1 QTC-200 Interface Board Configuration
..............................
26
4.2 Hardware Configuration
...........................................
25
4.1.2 QTC-200T Terminal Board Description
...............................
25
4.1.1 QTC-200 Interface Board Description
.................................
25
4.1 Circuit Board Description
..........................................
24
4 QTC-200 Thermocouple Input Module
..................
23
3.2 QTC-100 Specifications
.............................................
22
3.1.2 Power Jack and Switch
.............................................
22
3.1.1 AC/DC Power Supply Priority
......................................
22
3.1 Circuit Board Description
..........................................
21
3 QTC-100 DC Voltage Power Adapter Module
..........
20
2.4 Physical Dimensions
...............................................
20
2.3 Power Requirements
...............................................
19
2.2.3 Multiple Enclosures
...............................................
19
2.2.2 External TTL Trigger Connector
.....................................
19
2.2.1 Data Acquisition Adapter Connection
................................
19
2.2 External Connections
...............................................
19
2.1 Multiple Module Enclosures
........................................
18
2 SignalPro™ Series Racks and Enclosures
...............
16
1.3.3 Expansion Channel Numbering
.....................................
15
1.3.2 Board Selection Jumper Configuration
................................
14
1.3.1 Main A/D Channel Selection and Jumper Configuration
................
14
1.3 Hardware Configuration
...........................................
14
1.2.2 Terminal Board Description
........................................
13
1.2.1 Interface Board Description
.........................................
13
1.2 Hardware Description
..............................................
12
1.1.4 Analog-to-Digital Converter (ADC)
..................................
12
1.1.3 Multiplexer
......................................................
12
1.1.2 Signal Conditioner
................................................
12
1.1.1 Transducers
......................................................
11
1.1 Functional Description
.............................................
11
1 SignalPro™ Series Overview
...............................
SignalPro Series Users Manual 5
67
7.4 QTC-350/QTC-350S Specifications
..................................
65
7.3 Field Wiring
.......................................................
60
7.2.1 QTC-350 Interface Board Configuration
..............................
60
7.2 Hardware Configuration
...........................................
60
7.1 Circuit Board Description
..........................................
59
7 QTC-350 Accelerometer/Dynamic Signal Input
Module
..............................................................
57
6.6 QTC-300S/QTC-300T Specifications
................................
54
6.5 Configuration Examples
............................................
53
6.4.4 Quarter Bridge Strain Gage Measurements
............................
52
6.4.3 Half Bridge Strain Gage Measurements
...............................
51
6.4.2 Full Bridge Strain Gage Measurements
...............................
51
6.4.1 Basic Principles
..................................................
51
6.4 Strain Gage Measurements
.........................................
50
6.3.2 Calibration Mode
.................................................
49
6.3.1 Normal Mode
....................................................
49
6.3 Calibration Modes
.................................................
47
6.2.2 QTC-300T Terminal Board Configuration
.............................
43
6.2.1 QTC-300 Interface Board Configuration
..............................
43
6.2 Hardware Configuration
...........................................
42
6.1.2 QTC-300T Terminal Board Description
...............................
42
6.1.1 QTC-300 Interface Board Description
.................................
42
6.1 Circuit Board Description
..........................................
41
6 QTC-300 Strain Gage Input Signal
Conditioning Module
...........................................
39
5.5 QTC-250/QTC-250T Specifications
.................................
38
5.4.3 Four-Wire RTD Measurements
......................................
38
5.4.2 Three-Wire RTD Measurements
.....................................
37
5.4.1 Two-Wire RTD Measurements
......................................
37
5.4 Basic Principles
...................................................
37
5.3 RTD Measurements
................................................
34
5.2.2 QTC-250T Terminal Board Configuration
.............................
34
5.2.1 QTC-250 Interface Board Configuration
..............................
34
5.2 Hardware Configuration
...........................................
33
5.1.2 QTC-250T Terminal Board Description
...............................
33
5.1.1 QTC-250 Interface Board Description
.................................
33
5.1 Circuit Board Description
..........................................
32
5 QTC-250 RTD Signal Conditioning Module
............
30
4.4 QTC-200/QTC-200T Specifications
.................................
SignalPro Series Users Manual 6
88
10.4 QTC-500/QTC-500T/QTC-500TC Specifications
...................
86
10.3 Field Wiring
......................................................
86
10.2.2 QTC-500T / QTC-500TC Terminal Board Configuration
................
85
10.2.1 QTC-500 Interface Board Configuration
..............................
85
10.2 Hardware Configuration
..........................................
85
10.1.2 QTC-500T/QTC-500TC Terminal Board Description
...................
85
10.1.1 QTC-500 Interface Board Description
................................
85
10.1 Circuit Board Description
.........................................
84
10 QTC-500 5B Module Multipurpose Isolated
Signal Input Card
................................................
82
9.5 QTC-450 Specifications
.............................................
81
9.4.3 Low Pass Filter Design Examples
....................................
80
9.4.2 Filter Block Configuration
..........................................
79
9.4.1 Filter Parameter Selection
..........................................
79
9.4 Filter Design Program
..............................................
78
9.3 Field Wiring
.......................................................
74
9.2.1 QTC-450 Interface Board Configuration
..............................
74
9.2 Hardware Configuration
...........................................
74
9.1 Circuit Board Description
..........................................
73
9 QTC-450 Low/High Bandpass Filter Input
Module
..............................................................
72
8.3 QTC-400/400T Specifications
.......................................
70
8.2.1 QTC-400 Interface Board Configuration
..............................
70
8.2 Hardware Configuration
...........................................
70
8.1.2 QTC-400T Terminal Board Description
...............................
70
8.1.1 QTC-400 Interface Board Description
.................................
70
8.1 Circuit Board Description
..........................................
69
8 QTC-400 Universal Current/Voltage Input
Module
..............................................................
SignalPro Series Users Manual 7
List of Figures
61
Figure 7-4. Filter Selection Jumpers
.............................................
61
Figure 7-3. QTC-350/QTC-350S SSH Selection Jumper
............................
60
Figure 7-2. QTC-350 Interface Board Jumper and Switch Locations
...................
59
Figure 7-1. QTC-350 Accelerometer/Dynamic Signal Input Module
..................
53
Figure 6-15. Quarter Bridge Wiring Configuration
.................................
52
Figure 6-14. Half Bridge Wiring Configuration
....................................
52
Figure 6-13. Full Bridge Wiring Configuration
.....................................
51
Figure 6-12. Full Wheatstone Bridge Strain Gage Measurement
.......................
49
Figure 6-11. Calibration Modes
..................................................
48
Figure 6-10. External Excitation Power Supply Connections
..........................
48
Figure 6-9. Excitation Current Selection
..........................................
47
Figure 6-8. QTC-300T Terminal Board
...........................................
46
Figure 6-7. AC/DC Coupling Jumper
...........................................
45
Figure 6-6. Low-Pass Filter Block
...............................................
45
Figure 6-5. Filter Selection Jumper
..............................................
44
Figure 6-4. A/D Gain Selection Jumpers
.........................................
44
Figure 6-3. QTC-300/QTC-300S SSH Selection Jumper
............................
43
Figure 6-2. QTC-300 Jumper and Filter Block Locations
............................
41
Figure 6-1. QTC-300 Strain Gage Input Module
...................................
38
Figure 5-8. Four-Wire RTD Measurement
........................................
38
Figure 5-7. Three-Wire RTD Measurement
.......................................
37
Figure 5-6. Two-Wire RTD Measurement
........................................
36
Figure 5-5. Excitation Current Selection Jumpers
..................................
36
Figure 5-4. A/D Gain Selection Switches
........................................
34
Figure 5-3. QTC-250 Interface Board Jumper Locations
.............................
33
Figure 5-2. QTC-250T Terminal Board
...........................................
32
Figure 5-1. RTD Signal Conditioning Module
.....................................
29
Figure 4-6. Differential Thermocouple Measurement
..............................
29
Figure 4-5 Single Ended Thermocouple Measurement
.............................
27
Figure 4-4. Thermocouple Input Mode Selection Switches
..........................
27
Figure 4-3. QTC-200T Terminal Board
...........................................
26
Figure 4-2. QTC-200 Main A/D Channel Jumper Block Location
.....................
24
Figure 4-1. QTC-200 Thermocouple Input Module
................................
22
Figure 3-2. QTC-100 Block Diagram
.............................................
21
Figure 3-1. QTC-100 DC Voltage Power Adapter Module
...........................
19
Figure 2-2. Multiple Module Enclosure Block Diagram
.............................
18
Figure 2-1. SignalPro Series Data Acquisition Racks and Enclosures
..................
17
Figure 1-5. Expansion Channel Numbering in a Multiple Module System
.............
16
Figure 1-4. SignalPro Series Board Selection Jumpers
..............................
15
Figure 1-3. SignalPro Series Main A/D Channel Selection Jumpers
...................
13
Figure 1-2. SignalPro Portable Signal Conditioning System (QTC-250-PCS)
............
11
Figure 1-1. SignalPro Data Acquisition System Block Diagram
......................
SignalPro Series Users Manual 8
87
Figure 10-4. Field Wiring of 5B Series Modules
.....................................
86
Figure 10-3. QTC-500T /QTC-500TC Terminal Board
...............................
85
Figure 10-2. QTC-500 Jumper Block Locations
......................................
84
Figure 10-1. QTC-500 5B Module Multipurpose Isolated Input Card
...................
80
Figure 9-10. Corresponding Component Values of LP, HP and PP1
....................
80
Figure 9-9. Low-pass, Band-pass and High-pass Filter Block Diagram
................
78
Figure 9-8. QTC-450 Wiring Diagram
............................................
77
Figure 9-7. Analog Ground Option Switch
........................................
76
Figure 9-6. Filter Block Socket Designations
......................................
76
Figure 9-5. SSH Selection Jumper
...............................................
75
Figure 9-4. Filter Selection Jumpers
..............................................
75
Figure 9-3. A/D Channel Gain Selection Jumpers
..................................
74
Figure 9-2. QTC-450 Jumper Block, Filter Block and Switch Locations
.................
73
Figure 9-1. QTC-450 Low/High Bandpass Filter Input Module
......................
71
Figure 8-3. Analog Ground Option Jumper
.......................................
70
Figure 8-2. Current Measurement Resistor Sockets
.................................
69
Figure 8-1. QTC-400 Universal Voltage/Current Module
...........................
65
Figure 7-11. Dynamic Sensor Configuration
.......................................
65
Figure 7-10. ICP Sensor Configuration
............................................
64
Figure 7-9. Excitation Current Selection
..........................................
63
Figure 7-8. A/D Gain Selection Switch
...........................................
63
Figure 7-7. AC/DC Coupling Selection Jumper
....................................
63
Figure 7-6. Sensor Type Selection Jumper
........................................
62
Figure 7-5. Filter Block Socket Designations
......................................
SignalPro Series Users Manual 9
List of Tables
81
Table 9-2. Butterworth Low Pass Filter Design Examples
...........................
77
Table 9-1. Omega Pre-Configured Filter Blocks
....................................
66
Table 7-4. Maximum Driving Capability of a Coaxial Cable with 30pF/ft. Capacitance
..
64
Table 7-3. Expansion Channels versus A/D Gain Selection
..........................
62
Table 7-2. Butterworth Low Pass Filter Design Examples
...........................
62
Table 7-1. Omega Pre-Configured RC Filter Blocks
.................................
50
Table 6-3. QTC-300 Calibration Modes
..........................................
46
Table 6-2. Butterworth Low Pass Filter Design Examples
...........................
46
Table 6-1. Omega Pre-Configured RC Filter Blocks
.................................
35
Table 5-1. Suggested Gain and Excitation Current Values for Supported RTD Types
....
20
Table 2-1. Data Acquisition Enclosure Physical Dimensions
.........................
15
Table 1-2. Main A/D Channel Jumper Block Designators
...........................
14
Table 1-1. Expansion Channel Availability
.......................................
SignalPro Series Users Manual 10
1 SignalPro Series Overview
Electrical measurement of physical quantities is often performed using a “transducer”.
Transducers, in the context of this discussion, are devices that convert physical quantities such
as acceleration, strain or temperature to an electrical output signal. An example of a
transducer is the thermocouple, which is used to measure temperature. Transducers are
available in a wide variety of shapes, sizes and specifications for most applications.
The Omega SignalPro signal conditioning system provides a complete solution for data
acquisition using transducers. The SignalPro system provides the transducer with excitation
or biasing when required and then performs the necessary “conditioning” of the electrical
output signal from the transducer prior to measurement by an analog-to-digital converter
(ADC).
1.1 Functional Description
The SignalPro signal conditioning system covers a wide range of transducers and
applications, yet most of the modules share some common elements. Figure 1-1 shows a block
diagram of a typical data acquisition system using SignalPro series signal conditioning
modules.
Transducer
Transducer
Transducer
Transducer
Multiplexer
ADC
Computer
Signal
Conditioner
Signal
Conditioner
Signal
Conditioner
Signal
Conditioner
Figure 1-1. SignalPro Data Acquisition System Block Diagram
SignalPro Series Users Manual 11
1.1.1 Transducers
The SignalPro series includes signal conditioning modules that enable the user to create data
acquisition systems for transducers such as thermocouples, resistance temperature detectors
(RTDs), strain gages and accelerometers. Multiple transducers can be attached to a single
module, the number of which depends on the specific module selected.
1.1.2 Signal Conditioner
The electrical output signal generated by a transducer often needs “conditioning” before it can
be measured by an ADC. The signal may require amplification, filtering, linearization and
more before the ADC can accurately read it. Additionally, some transducers require an
excitation source or proper biasing to complete measurements. The SignalPro system provides
the transducer with any required excitation or biasing and performs all necessary
conditioning of the electrical output signal.
1.1.3 Multiplexer
SignalPro series modules can provide up to 16 channels of transducer input by multiplexing a
single main analog-to-digital (A/D) channel off the data acquisition adapter in the host
computer. The multiplexers on a SignalPro series module work like a switch, scanning each
transducer input channel and connecting the input to the selected main A/D channel.
The multiplexed input channels on the SignalPro module may be mapped back to any main
A/D channel on the data acquisition adapter in the host computer via jumper configuration.
Some modules provide less than 16 input channels, yet allow multiple modules to share a
single main A/D channel. For example, the QTC-250 RTD signal conditioning module has
eight input channels. Two QTC-250 modules may share one main A/D input channel to
provide 16 transducer input channels per main A/D channel. Multiplexing of all 16 main
A/D channels, (provided the A/D adapter type supports 16 channels), from the host
computer data acquisition adapter results in a maximum of 256 A/D transducer input
channels (16 x 16) per adapter.
1.1.4 Analog-to-Digital Converter (ADC)
The analog output signal from the transducer is converted to digital information by the ADC
in the data acquisition adapter in the host computer. Omega offers a complete line of data
acquisition adapters with both 12 and 16 bit resolution.
SignalPro Series Users Manual 12
1.2 Hardware Description
SignalPro series modules come in several configurations. The QTC-100 is a self-contained
power adapter module. The QTC-350 and QTC-450 are self contained interface boards with
BNC connectors. The remaining modules consist of two circuit boards: an interface board and
a removable terminal board. The interface boards are standard 3U size and easily mount in
the QTE-7 (seven modules), QTE-14 (fourteen modules) or QTC-xxx-PCS (one module) data
acquisition enclosures. The SignalPro terminal boards contain the transducer input screw
terminal blocks and most of the user configurable switches and jumper blocks. Figure 1-2
depicts a two board configuration with a single module data acquisition enclosure.
QTC-250-PCS Enclosure
QTC-250 Interface Board
QTC-250 Terminal Board
Terminal Box
SignalPro Series
Portable Signal Conditioning
System
Figure 1-2. SignalPro Portable Signal Conditioning System (QTC-250-PCS)
1.2.1 Interface Board Description
SignalPro interface boards operate with the following transducers and sensors: thermocouple
(QTC-200/200T), RTD (QTC-250/250T), strain gage (QTC-300/300T), accelerometer
(QTC-350), voltage/current (QTC-400/400T) and analog signal filter (QTC-450). The
QTC-500/500T is a multipurpose interface board that provides isolated input signals utilizing
5B modules. The SignalPro DC voltage adapter module, QTC-100, provides a versatile means
to power signal conditioning modules mounted in the QTE-7 half rack housing unit using
automobile battery power. After the initial configuration and mounting of an interface circuit
board, it rarely requires removal from the QTE-7, QTE-14 or QTC-xxx-PCS enclosure. For
information on interface board data acquisition enclosures, see Chapter 2: SignalPro Series
Racks and Enclosures.
SignalPro Series Users Manual 13
1.2.2 Terminal Board Description
SignalPro series modules QTC-200, 250, 300, 400 and 500 use the removable terminal board to
facilitate the quick connection of transducer lead wires. Lead wires easily attach to the screw
blocks on the portable terminal board. SignalPro series terminal boards slide into their own
protective enclosure which connects externally to the interface board and is secured with two
thumb screws.
1.3 Hardware Configuration
For the purpose of this discussion, it is presumed the user is configuring the SignalPro signal
conditioning system using an Omega sixteen channel data acquisition adapter, product
number: DAQP-12 or DAQP-16 (PCMCIA) or DAQ-1201/02 (ISA).
1.3.1 Main A/D Channel Selection and Jumper Configuration
There are sixteen analog input channels on the main connector of a Omega data acquisition
adapter. Each analog input channel of the adapter can connect to either one signal
conditioning module or multiple modules of the same type and thus be expanded up to 16
signal conditioning channels. The number of modules that can be connected to a single analog
input channel varies depending on the number of expansion channels the specific module
supports. For example, the QTC-300 supports four expansion channels, so four modules can
be connected to one analog input channel (4 x 4 = 16). The QTC-250 supports eight expansion
channels, so two modules can be connected to one analog input channel (8 x 2 = 16). Table 1-1
lists available expansion channels.
8
QTC-500
4
QTC-450
16
QTC-400
4
QTC-350
4
QTC-300
8
QTC-250
14
QTC-200
Number of Expansion
Channels Supported
Signal Conditioning Module
Table 1-1. Expansion Channel Availability
SignalPro series modules can occupy any analog input channel on the data acquisition
adapter. Which channel the module(s) will occupy is dependent on the configuration of the
main A/D channel selection jumper. Note that if multiple modules occupy the same main
A/D channel, then each module must have the same jumper setting. Figure 1-3 depicts the
main A/D channel selection jumper. The factory default setting is channel zero (CH0) for all
SignalPro series modules installed in the QTC-xxx-PCS portable data acquisition enclosure.
For modules installed in the QTE-7 and QTE-14 rack enclosures, the factory default setting for
the main A/D channel jumper will vary depending on the number of modules in each system.
See section 1.3.3 for a system configuration example.
SignalPro Series Users Manual 14
Main A/D Channel Selection Jumper
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15
Figure 1-3. SignalPro Series Main A/D Channel Selection Jumpers
The numerical designator for the main A/D channel jumper block varies from module to
module. Table 1-2 lists the designator for each specific module.
J1
QTC-500
J11
QTC-450
J1QTC-400
J15QTC-350
J5QTC-300
J10QTC-250
J1QTC-200
Main A/D Channel
Jumper Designation
Signal Conditioning Module
Table 1-2. Main A/D Channel Jumper Block Designators
1.3.2 Board Selection Jumper Configuration
Board selection jumper configuration options vary from module to module depending on the
number of expansion channels the module will support. Figure 1-4 depicts the board selection
jumpers with factory default settings and the numerical designator for each jumper block.
Note the factory default for all board selection jumpers is the lowest board number.
SignalPro Series Users Manual 15
Board Selection Jumper Configurations
(J9)
BD0
BD1
QTC-250
BD1
BD2
QTC-500
(J2)
BD0
BD1
BD2
BD3
QTC-300
(J6)
BD1
BD2
BD3
BD4
QTC-350/450
(J14/J9)
Figure 1-4. SignalPro Series Board Selection Jumpers
When configuring multiple SignalPro modules to one main A/D channel, the position of the
board selection jumper will determine which module is connected to a specific numerical
section of the sixteen available expansion channels. For example, if two QTC-250 modules
were connected to one main A/D channel, the first QTC-250 module would use the “BD0”
configuration and would occupy expansion channels 0 - 7. The second QTC-250 module
would use the “BD1” configuration and would occupy expansion channels 8 - 15.
1.3.3 Expansion Channel Numbering
Figure 1-5 depicts the logical channel numbering for a signal conditioning system in which
four main A/D channels from the host computer data acquisition adapter are expanded. (The
QTC-200 module actually only has fourteen data acquisition channels. Channels one and two
are utilized for cold junction and offset information).
SignalPro Series Users Manual 16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
CH0
CH1
CH2
CH3
50
51
52
53
54
55
44
45
46
47
48
49
QTC-200
BD0
BD1
16
17
18
19
20
21
22
23
QTC-250
40
41
42
43
QTE-7
015
To Data Acquisition
adapter: DAQP-12/16
or DAQ-1201/1202
One QTC-200: 14 channels thermocouple input
One QTC-250: 8 channels RTD input
Four QTC-300s: 16 channels strain gage input
One QTC-350: 4 channels accelerometer input
Main A/D channels
unused. Channels 4 - 15
not multiplexed into
subchannels.
QTC-200/QTC-250/QTC-300/QTC-300/QTC-300/QTC-300/QTC-350
QTC-300
BD2
QTC-300
BD3
QTC-300
BD0
QTC-350
BD0
QTC-300
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Figure 1-5. Expansion Channel Numbering in a Multiple Module System
SignalPro Series Users Manual 17
2 SignalPro™ Series Racks and Enclosures
Enclosure Features
Flexibility to combine multiple types of modules in a single unit
Ruggedized aluminum, metal, and plastic enclosures
External trigger source input with BNC connector
Compatible with all SignalPro Series modules
Multiple enclosures can be linked together using only one data acquisition adapter for
up to 256 channels in a system.
Power can be supplied by a flexible range of either AC or DC voltage with appropriate
options installed
The SignalPro series interface boards are a standard 3U size and mount easily into the QTE-7,
QTE-14 or QTC-xxx-PCS data acquisition enclosures. Each of these enclosures is equipped
with a DIN-48 female connector(s) to mate with the interface boards and a standard Omega
D-37 data acquisition connector which mates with the data acquisition adapter in the host
computer.
There are three housing options available for SignalPro modules: (1) the QTE-14 rack mount
enclosure which holds up to 14 modules, (2) the QTE-7 half rack enclosure which holds up to
7 modules and (3) the QTC-xxx-PCS portable unit which accommodates a single module. (See
Figure 2-1).
QTE-7
QTE-14
QTC-xxx-PCS
Figure 2-1. SignalPro Series Data Acquisition Racks and Enclosures
SignalPro Series Users Manual 18
2.1 Multiple Module Enclosures
Figure 2-2 shows the block diagrams for the QTE-7 and QTE-14 data acquisition enclosures.
Sensor
Sensor
QTC-200
QTC-300
QTC-200
QTC-300
QTC-200
QTC-300
QTC-200
QTC-300
QTC-200
QTC-250
QTC-300
QTC-400
QTC-350
QTC-450
QTC-500
......
Power
Module
Data
Acquisition
Adapter
QTE-7 / QTE-14
Figure 2-2. Multiple Module Enclosure Block Diagram
SignalPro modules may be mounted into any slot in the data acquisition enclosures. (The
QTC-100 power adapter module will only mount in the first slot of the QTE-7 and are not
available for the QTE-14).
2.2 External Connections
2.2.1 Data Acquisition Adapter Connection
Each of the SignalPro series enclosures is equipped with a D-37 female connector that is pin
compatible with Omega data acquisition adapters. Omega data acquisition adapters are
available with 12 and 16 bit resolution.
2.2.2 External TTL Trigger Connector
The data acquisition adapter in the host computer requires an initial signal to start A/D
conversions. Depending on the software configuration, A/D conversions will be initiated by
either a software trigger or an external hardware trigger. Each of the SignalPro series data
acquisition enclosures provides a BNC connector for a hardware TTL trigger input. The TTL
trigger starts A/D conversions on either the rising or falling edge of a TTL signal. The BNC
connector maps the TTL input back to pin 25, (digital input channel 0), on the Omega D-37
data acquisition adapter.
2.2.3 Multiple Enclosures
Multiple SignalPro series enclosures can be linked together using only one data acquisition
adapter to expand a signal conditioning system from sixteen up to 256 channels. An Omega
D-37 adapter cable, product number: CP-DAQ, is required to link multiple enclosures in your
system.
SignalPro Series Users Manual 19
2.3 Power Requirements
The QTE-7 and QTE-14 enclosures require an AC input voltage from 90 to 260 VAC @ 60 Hz.
With the QTE-7, the user has the option of using an Omega QTC-100 power module. The
power module allows the user to power a remote data acquisition system with automobile
battery power. The QTC-xxx-PCS requires a DC input voltage from 9 to 25 VDC and is
shipped with a 12v, 2.92A power supply module included.
All three enclosure models have a +5V and +/-15V DC power supply mounted inside the
enclosure to provide power for SignalPro series modules. The QTC-xxx-PCS internal power
supply automatically corrects the polarity of the input voltage to provide maximum flexibility
in choosing a power source for the portable enclosure.
2.4 Physical Dimensions
Table 2-1 lists the physical dimensions of each enclosure in the SignalPro series.
5.22” (132.7mm)
9.39” (238.7mm)
17.68” (449.1mm)
QTE-14
5.22” (132.7mm)
9.39” (238.7mm)
9.28” (235.7mm)
QTE-7
1.56” (39.62mm)
8.78” (233.0mm)
5.57” (141.5mm)
QTC-xxx-PCS
Height
Depth
Width
SignalPro Enclosure
Table 2-1. Data Acquisition Enclosure Physical Dimensions
SignalPro Series Users Manual 20
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