Omega Products SignalPro Installation Manual

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CUSTOM CONFIGURABLE SIGNAL CONDITIONING MODULES

SignalPro

OMEGA ENGINEERING, INC. Tel: [phone]



Signal Conditioning System

Users Manual

One Omega Drive Fax: [phone]
P.O. Box 4047 Toll free:1-800-826-6342
Stamford, CT 06907-4047 E-mail:[e-mail]

http://www.dasieee.com

WARRANTY WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC., warrants this unit to be free of defects in materials and workmanship fo r a period of 13
months from the date of purchase. OMEGA warranty adds an additional one (1) month grace period to the normal one (1)
year product warranty to cover shipping and handling time. This ensures that OMEGA’s customers receive maximum

coverage on each product. If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA’s
Customer Service Department will issue an Authorized Return (AR) number im mediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective it will be repaired or replaced at no charge. OMEGA’s
warranty does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling,
improper interfacing, operation o utside design limits, impr oper repair or unauthorized modif ication. This WARRANTY is
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PROPER PACKAGING TO PREVENT BREAKAGE IN TRANSIT.

FOR WARRANTY
(1) P.O. Number under which the product was purchased,
(2) Model and serial number of the product under warranty, and
(3) Repair instructions and/or specific problems relative to the product.

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BEFORE contacting OMEGA:
(1) P.O. Number to cover the cost of the repair,
(2) Model and serial number of the product, and
(3) Repair instructions relative to the product.

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customers the latest in technology and engineering. OM EGA is a registered trademark of OMEGA EN GI N EERIN G, I N C. ©
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written consent of OMEGA ENGINEERING, INC.

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[e-mail]

:

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:

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The information contained in this document is believed to be correct but OMEGA Engineering, Inc.
accepts no liability for any errors it contains, and reserves the right to alter specifications without
notice. WARNING: These products are not designed for use in, and should not be used for, p atient
connected applications.

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E-mail: [e-mail]

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

4.3 Basic Principles

26

4.2.2 QTC-200T Terminal Board Configuration

26

4.2.1 QTC-200 Interface Board Configuration

4.2 Hardware Configuration

25

4.1.2 QTC-200T Terminal Board Description

25

4.1.1 QTC-200 Interface Board Description

4.1 Circuit Board Description

4 QTC-200 Thermocouple Input Module

3.2 QTC-100 Specifications

22

3.1.2 Power Jack and Switch

22

3.1.1 AC/DC Power Supply Priority

3.1 Circuit Board Description

3 QTC-100 DC Voltage Power Adapter Module

2.4 Physical Dimensions

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

2.2 External Connections

2.1 Multiple Module Enclosures

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

1.3 Hardware Configuration

14

1.2.2 Terminal Board Description

13

1.2.1 Interface Board Description

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

1.1 Functional Description

1 SignalPro™ Series Overview

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SignalPro Series Users Manual 5

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18
19
19

20
20

21
22

23

24
25

26

28

7.4 QTC-350/QTC-350S Specifications

7.3 Field Wiring

60

7.2.1 QTC-350 Interface Board Configuration

7.2 Hardware Configuration

7.1 Circuit Board Description

7 QTC-350 Accelerometer/Dynamic Signal Input

6.6 QTC-300S/QTC-300T Specifications

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

6.4 Strain Gage Measurements

50

6.3.2 Calibration Mode

49

6.3.1 Normal Mode

6.3 Calibration Modes

47

6.2.2 QTC-300T Terminal Board Configuration

43

6.2.1 QTC-300 Interface Board Configuration

6.2 Hardware Configuration

42

6.1.2 QTC-300T Terminal Board Description

42

6.1.1 QTC-300 Interface Board Description

6.1 Circuit Board Description

6 QTC-300 Strain Gage Input Signal

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

5.4 Basic Principles

5.3 RTD Measurements

34

5.2.2 QTC-250T Terminal Board Configuration

34

5.2.1 QTC-250 Interface Board Configuration

5.2 Hardware Configuration

33

5.1.2 QTC-250T Terminal Board Description

33

5.1.1 QTC-250 Interface Board Description

5.1 Circuit Board Description

5 QTC-250 RTD Signal Conditioning Module

4.4 QTC-200/QTC-200T Specifications

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SignalPro Series Users Manual 6

30

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Conditioning Module

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32
33

34

37
37

39

41
42

43

49

51

54
57

Module

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59
60
60

65
67

10.4 QTC-500/QTC-500T/QTC-500TC Specifications

10.3 Field Wiring

86

10.2.2 QTC-500T / QTC-500TC Terminal Board Configuration

85

10.2.1 QTC-500 Interface Board Configuration

10.2 Hardware Configuration

85

10.1.2 QTC-500T/QTC-500TC Terminal Board Description

85

10.1.1 QTC-500 Interface Board Description

10.1 Circuit Board Description

10 QTC-500 5B Module Multipurpose Isolated

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

9.4 Filter Design Program

9.3 Field Wiring

74

9.2.1 QTC-450 Interface Board Configuration

9.2 Hardware Configuration

9.1 Circuit Board Description

9 QTC-450 Low/High Bandpass Filter Input

8.3 QTC-400/400T Specifications

70

8.2.1 QTC-400 Interface Board Configuration

8.2 Hardware Configuration

70

8.1.2 QTC-400T Terminal Board Description

70

8.1.1 QTC-400 Interface Board Description

8.1 Circuit Board Description

8 QTC-400 Universal Current/Voltage Input

Module

SignalPro Series Users Manual 7

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69
70

70

72

Module

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Signal Input Card

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73
74
74

78
79

82

84
85

85

86
88

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

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SignalPro Series Users Manual 8

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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

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62

Figure 7-5. Filter Block Socket Designations

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SignalPro Series Users Manual 9

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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

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SignalPro Series Users Manual 10

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1 SignalPro Series Overview

SignalPro Series Users Manual 11

Electrical measurement of physical quantities is often performed using a “transducer”.
Transducers, i n the context of this discussi on, are d evices 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, ye t most of the modul es shar e some common elements. F i gur e 1-1 shows a bl ock
diagram of a typical data acquisition system using SignalPro series signal conditioning
modules.

Transducer

Signal

Conditioner

Transducer

Signal

Conditioner

Multiplexer

ADC

Computer

Transducer

Signal

Conditioner

Transducer

Signal

Conditioner

Figure 1-1. SignalPro Data Acquisition System Block Diagram

1.1.1 Transducers

The SignalPro series includes signal conditioning modules that enable the user to create data

SignalPro Series Users Manual 12

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 electri ca l output signal generated b y a transducer of te n nee d s “conditioni ng ” b e f or e 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 bia sing to complete me asurements. The Signal Pro syste m provid es
the transducer with any required excitation or biasing and performs all necessary
conditioning of the electrical output signal.

1.1.3 Multiplexer

SignalPro ser ies modul es can pr ovide up to 16 cha nnels of tr ansducer input b y mul tipl exi ng a
single main analog-to-digital (A/D) channel off the data acquisition adapter in the host
computer. The mul tiplexers on a SignalPro seri es module work like a switch, scanning each
transducer input channel and connecting the input to the selected main A/D channel.

The multipl exed input channels on the SignalPro modul e 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 si gnal from the tra nsducer is converted to di gital inf ormation 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.

1.2 Hardware Description

SignalPro series modules come in several configurations. The QTC-100 is a self-contained

SignalPro Series Users Manual 13

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.

Terminal Box

QTC-250 Terminal Board

QTC-250 Interface Board

QTC-250-PCS Enclosure

SignalPro Series
Portable Signal Conditioning
System

Figure 1-2. SignalPro Portable Signal Conditioning System (QTC-250-PCS)

1.2.1 Interface Board Description

SignalPro i nterface board s operate with the following transducers and sensor s: 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.

1.2.2 Terminal Board Description

SignalPro series modules QTC-200, 250, 300, 400 and 500 use the removable terminal board to

8

QTC-500

4

QTC-450

16

QTC-400

4

QTC-350

4

QTC-300

8

QTC-250

14

QTC-200

Number of Expansion

Signal Conditioning Module

SignalPro Series Users Manual 14

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 enclosur e which connects externally to the inte rface board and is secur ed 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 condi tioning channel s. Th e number of mod ules that can be connected to a singl e 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 modul es can be connecte d to one anal og input channel (8 x 2 = 16 ). Ta ble 1-1
lists available expansion channels.

Channels Supported

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.

Main A/D C hannel Selection J umper

J1

QTC-500

J11

QTC-450

SignalPro Series Users Manual 15

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.

Signal Conditioning Module

Main A/D Channel

Jumper Designation

J1QTC-200
J10QTC-250
J5QTC-300
J15QTC-350
J1QTC-400

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 16

Board Selection Jumper Configurations

QTC-250

QTC-300

(J9)

BD0

BD1

(J6)

BD0

BD1

BD2

BD3

QTC-500

QTC-350/450

(J2)

BD1

BD2

(J14/J9)

BD1

BD2

BD3

BD4

Figure 1-4. SignalPro Series Board Selection Jumpers

When configuri ng multiple Signa lPro 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 channel s. Channels one and two
are utilized for cold junction and offset information).

QTC-200/QTC-250/QTC-300/QTC-300/QTC-300/QTC-300/QTC-350

SignalPro Series Users Manual 17

10
11
12
13
14
15

CH0

0
1
2
3
4
5
6
7
8
9

QTC-200

16
17
18
19
20
21
22
23

BD0

QTC-250

24
25
26
27

28
29
30
31

32
33
34
35

36
37
38
39

CH1

QTC-300

QTC-300

QTC-300

QTC-300

CH2

40
41
42
43

BD0

BD1

BD2

BD3

To Data Acquisition

adapter: DAQ P-12/16

or DAQ-1201/1202

QTE-7

015

44
45
46
47
48

CH3

Main A/D channels
unused. Channels 4 - 15
not multiplexed into
subchannels.

QTC-350

BD0

One QTC-200: 14 channels thermo couple input

One QTC -250: 8 channels RTD input
Four QT C-300s: 16 ch an nels strain gage input
One QTC -350: 4 channels acceler ometer i n put

49
50
51
52
53
54
55

Figure 1-5. Expansion Channel Numbering in a Multiple Module System

2 SignalPro™ Series Racks and Enclosures

Enclosure Features

SignalPro Series Users Manual 18



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 interf ace boards and a standar d Omega
D-37 data acquisition connector which mates with the data acquisition adapter in the host
computer.

There are three housing options a vailable for Si gnalPro 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

QTC-xxx-PCS

QTE-14

Figure 2-1. SignalPro Series Data Acquisition Racks and Enclosures

2.1 Multiple Module Enclosures

Figure 2-2 shows the block diagrams for the QTE-7 and QTE-14 data acquisition enclosures.

SignalPro Series Users Manual 19

Data

Acquisition

Adapter

Power
Module

QTC-200
QTC-250

QTC-350
QTC-500

QTE-7 / QT E -14

QTC-200

QTC-200

QTC-200

QTC-200

QTC-300
QTC-400

QTC-450

QTC-300

QTC-300

......

QTC-300

QTC-300

Sensor

Sensor

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 SignalPr o 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 adapte r cable, prod uct number: CP-D AQ, is requ ired to link multiple enclosures in your
system.

2.3 Power Requirements

The QTE-7 and QTE -14 enclosures require an AC input voltage from 90 to 260 VAC @ 60 Hz.

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

SignalPro Series Users Manual 20

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 pola rity of the input vol tage to pr ovide maximum f lexi bility
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.

Table 2-1. Data Acquisition Enclosure Physical Dimensions

3 QTC-100 DC Voltage Power Adapter Module

QTC-100 Features

SignalPro Series Users Manual 21



Standard 3U interface board for use with the QTE-7 half-rack housing unit



Supplies 25 watts of total power to the QTE-7



No polarity required on the DC input voltage - Center pin can be positive or negative



Power LED to indicate slot status



Optional power cord allows system to be powered from a standard automobile
cigarette lighter

The QTC-100 is a DC voltage power adapter module which provides a convenient way to
power SignalPro series modules using an automobile battery. For use with the QTE-7
half-rack housing unit, the QTC-100 accepts DC input voltage from 10 to 28vdc and generates

the +5 and ±15vdc output require d to powe r a remote d ata acquisi tion syste m. An optional six
foot cord, ( product number: QTC-PWR-DC), is availa ble to al low the user to gene rate system
power using a standard automobile cigarette lighter. (See Figure 3-1).

Power

Indicator

Power

Switch

Input Jack

DC 9~28V

Figure 3-1. QTC-100 DC Voltage Power Adapter Module

QTC-100 DC Voltage

QTE-7

Power Adapter

3.1 Circuit Board Description

The QTC-100 is a standard 3U size board designed for use with the QTE-7 half rack data

SignalPro Series Users Manual 22

acquisition enclosure. A block diagram of QTC-100 is shown in Figure 3-2. The DC to DC
converter accepts input voltage from 10 to 28vdc and in turn generates +5, +15 and -15vdc.
The 14-pin male power connector and the DIN-48 male connector on the QTC-100 interface
board will only connect to the first slot of the QTE-7.

14-Pin Power Connector

+5v, +/-15v

LED

Power
Switch

DC/DC

Converter

10~28 vdc

QTC-100

Figure 3-2. QTC-100 Block Diagram

3.1.1 AC/DC Power Supply Priority

With the QTC-100 DC Voltage Power Adapter Module, the QTE-7 half rack enclosure can
accept either AC power (90~260 vac) or DC power (9~28 vdc). If both power supplies are
available simultaneously, the QTE-7 will use AC power to generate the +5, +15 and -15VDC
power required for all SignalPro series modules in the QTE-7 system. If the AC power supply
is unavailable or failed, the QTE-7 will automatically switch to DC power from QTC-100
power module.

DIN-48

Connector

3.1.2 Power Jack and Switch

The QTC-100 power jack accepts 9~28vdc through a 2.5 x 5.5mm DC plug in which the center
pin can be either positive or negative. A push button switch on the front panel is used to
control power to the QTE-7 and a green LED indicates the power status. (Refer to Figure 3-1
for locations of the power jack, switch and indicator).

3.2 QTC-100 Specifications

0.3 Kg

Weight:

100mm X 166.4mm

Dimension:

500 VDC

Isolation:

50mV p-p (+5V), 100mV p-p (+/-15V)

Noise/Ripple:

0.25% (+5V), 3% (+/-15V)

Load Regulation:

0.25% for +5V, 2% for +/-15V

Line Regulation:

+5V+/-1%@3.50A, +15V+/-3%@0.50A, -15V+/-3%@0.50A

Output Voltage:

25 Watts

Total Power:

<100 mA p-p 80-85% typical

Input Ripple Current:

No Polarity required (Center pin can be either positive or

Input Polarity:
Suitable for 2.5 x 5.5mm DC plug

Power Jack:

DIN-48 male and 14-pi n right angle male, mates with fi rst slot

Connectors:

SignalPro Series Users Manual 23

of QTE-7

negative)

4 QTC-200 Thermocouple Input Module

QTC-200 Features

SignalPro Series Users Manual 24



Fourteen Thermocouple input channels



Up to 224 Analog Input Channels can be configured in a system



Thermocouple types J, K, T, E, S or R, N & B supported



On board Low Pass Filter for each channel (-80dB @ 50Hz)



Isolated Cold Junction Compensation



Terminal block for quick, easy signal connections

The QTC-200 is a fourteen channel thermocouple input module. Each channel is equipped
with a separate instrument amplifier, offset adjustment and low pass filter. Up to sixteen
QTC-200 modules can be configured in an Omega signal conditioning and data acquisition
system for a total of 224 analog input channel s. The QTC-200 can also be coupled with other
modules in Quatech’s SignalPro™ series to provide a versatile data acquisition system.

The QTC-200 module consists of two circuit boards: the QTC-200 interface board and the
QTC-200T terminal board. The interface board is a standard 3U size board which can be
mounted in the QTE-7, QTE-14 or QTC-200-PCS data acquisition enclosures. The QTC-200T
terminal board contains the thermocouple input screw blocks, Cold Junction Compensation
(CJC) sensor and the mode selection switches. This two board configuration allows quick and
easy connection of the thermocouple lead wires. After the initial configuration of the interface
board, it can be mounted in a data acquisition enclosure and will rarely require removal. All
connections are completed on the screw terminals of the portable QTC-200T, which is then
plugged into the interface board and secured using two thumb screws. (See Figure 4-1).

Thermocouple
Sensors

QTC-200 Terminal Board

Figure 4-1. QTC-200 Thermocouple Input Module

QTE-7

QTC-200 Interface Board

QTC-200-PCS

4.1 Circuit Board Description

SignalPro Series Users Manual 25

4.1.1 QTC-200 Interface Board Description

The QTC-200 interface board shown in Figure 4-1 can be mounted in SignalPro series data
acquisition racks and enclosures. (See Chapter 2 for information on SignalPro series racks).
Each rack enclosure i s equipped wi th a DIN-4 8 female connector which mate s to the QTC-200
and other SignalPro series signal conditioners. The rack also contains a standard Omega D37
connector which attaches to the host computer data acquisition adapter.

The QTC-200 provides sixteen channels; one channel for CJC input, one channel for zero offset
input and fourteen channels for thermocouple input; by multiplexing a single main A/D
channel off the host computer data acquisition adapter. The mul ti pl exer on the QTC-200 scans
the sixteen input channels sequentially and connects each input to the single main A/D
channel. The sixteen multiplexed input channels may be mapped back to any main A/D
channel on the data acquisition adapter depending on the configuration of jumper J1.
Multiplexi ng of all 16 main A/D channel s from the host computer results in a maximum of
256 channels consisting of 224 A/D input channels (14 x 16) and 32 CJC/zero offset input
channels (2 x 16) per data acquisition adapter.

4.1.2 QTC-200T Terminal Board Description

The QTC-200T terminal board contains the thermocouple input screw blocks and the mode
selection switches which configure either differential or single ended input for each channel.
The terminal board DIN-48 female connector plugs into the QTC-200 interface board and is
equipped with a strain relief bracket to secure external thermocouple wiring.

4.2 Hardware Configuration

SignalPro Series Users Manual 26

For system configuration options see Chapter 1: SignalPro Series Overview, section 1.3:
Hardware Configuration.

4.2.1 QTC-200 Interface Board Configuration

QTC-200

Main A/D Channel
Selection Jumper J1

CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15

Figure 4-2. QTC-200 Main A/D Channel Jumper Block Location

Figure 4-2 shows the location of the main A/D channel selection jumper block J1. System
configuration options for J1 are discussed extensively in Chapter 1, section 1.3

4.2.2 QTC-200T Terminal Board Configuration

Figure 4-3 depicts the location of the thermocouple input screw blocks, differential or
single-ended mode selection switches (SW1 and SW2), CJC sensor and the thermocouple lead
wire strain relief bracket.

ST1

SignalPro Series Users Manual 27

TC8

TC7

TC6

TC5

TC4

TC3

TC2

-

+

CJC

Sensor

-

+

-

+

-

+

-

+

-

+

-

+

TC9

TC10

TC11

TC12

TC13

TC14

TC15

-

+

-

+

-

+

-

+

-

+

SW2

-

+

-

+

QTC-200T

Figure 4-3. QTC-200T Terminal Board

SW1

O

N

1 2 3 4 5 6 7 8

O

N

1 2 3 4 5 6 7 8

4.2.2.1 Thermocouple Input Mode Selection Switches
Figure 4-4 depicts the mode selection switches for thermocouple input channels 2 through 15.

12345678

Thermocouple

12345678

Switch OFF (Open) - - - Differential Input
Switch ON (Closed) - - - Single Ended

All Switches shown with factory default setting:

OFF (Differential Input)

ON

ON

CH15
CH14
CH13
CH12
CH11
CH10
CH9
CH8

CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0

OFFSET
CJC

Figure 4-4. Thermocouple Input Mode Selection Switches

4.3 Basic Principles

Thermocouples measure temperature using the Seebeck Effect which occurs at the junction

SignalPro Series Users Manual 28

connection of two dissimilar metals. A voltage difference is generated at the junction that
changes with temperature over a given range. This voltage is not a linear function of
temperature and theref ore cannot be rela ted dir ectly to temperature. Linear ization table s and
polynomial appr oximation are two methods used to transform thermocouple input into real
temperature measurement.

One problem experienced with thermocouple temperature measurement is when the junction
between thermocouple lead wires and terminal blocks creates, in essence, another
thermocouple. The QTC-200 signal conditioning module provides a practical solution to this
problem by using a built in cold junction compensation circuit to neutralize the voltage
created at the terminal block junction.

Damaged thermocouples can introduce another significant source of measurement error by
becoming open or extremely resistive. The QTC-200 si gnal conditioning modul e uses an open
thermocouple detection circuit on each thermocouple input to guard against this possibility.
The detection circuit drives a low level current through the thermocouple causing the input
amplifiers to be driven to rails whenever an open or highly resistive thermocouple is present.

4.3.1 Cold Junction Compensation (CJC) Sensor

The QTC-200T uses an isolated CJC sensor to detect temperature at the thermocouple
terminals with high accuracy and minimize any temperature difference between the CJC
sensor and thermocouple terminal junctions.

The first channel (CH0) is used to measure temperature at the CJC sensor.
Temperature in °C : TC and in °F : TF is calculated as follows:

TC = - 273

(A+Bln(R)+C(ln(R))

1

3

)

R = VCH0 * 5000 / (10 - VCH0)

TF = Tc * 9 / 5 + 32

where A=0.00128974451631 VCH0: Voltage reading at CH0 in volts

B=0.00023530184288 R: Resistance of the sensor in ohms

C=0.00000009729702

4.3.2 Software Zero Correction

SignalPro Series Users Manual 29

Since most thermocouple signals are within the 100mV range, offset voltage between the
QTC-200T and the data acquisition adapter must be monitored. QTC-200 channel 1 (CH1) is
used to check the zero reference of the QTC-200T, then the data acquisition system software
subtracts this offset.

4.3.3 Single Ended Thermocouple Measurements

A single ended thermocouple measurement is shown in Figure 4-5. The thermocouple input
channel must be configured for single ended operation as discussed in section 4.2.2.1 of this
chapter.

ST1

GND

+

+

Thermocouples

Strain Relief

Bracket

Thermocouple

Terminal Block

Figure 4-5 Single Ended Thermocouple Measurement

4.3.4 Differential Thermocouple Measurements

A differential thermocouple measurement is shown in Figure 4-6. The thermocouple input
channel must be configured for differential operation as discussed in section 4.2.2.1 of this
chapter.

ST1

Wire Shield

GND

-

Thermocouple

Strain Relief

Bracket

+

Thermocouple

Terminal Block

Figure 4-6. Differential Thermocouple Measurement

4.4 QTC-200/QTC-200T Specifications

SignalPro Series Users Manual 30

Connector: DIN-48 male, mates with QTE-7, QTE-14 and QTC-200-PCS

Signal Connection: DIN-48 female, mates with terminal block

Number of TC Channels: 14 (CH0: CJC; CH1: Zero offset; CH2-15: Thermocouple inputs)

Input Type: Differential/Single-ended ( DIP Switch Select-able)

Precision Thermistor: 5000 Ohm @ 25 °C

Supported Thermocouple Type, Temperature Range

Type

J Thermocouple: -200°C to 760°C

K Thermocouple: -100°C to 1350°C

T Thermocouple: -200°C to 400°C

E Thermocouple: -200°C to 1000°C

S or R Thermocouple: 0°C to 1760°C

N Thermocouple: 0°C to 1300°C

B Thermocouple: 0°C to 1800°C

Voltage Input Range: ±100 mVDC

Maximum Input Voltage: -20V to +15V DC

Input Bias Current: 6 nA typ

Input Offset Voltage: ± 0.07 mV typ, ± 0.25 mV max (Adjustable to zero)

Range

Input Offset Drift: ± 0.4 lV/°C typ, ± 2.0 lV/°C max

Gain Range: 100 fixed

Gain Error: X100

Input Impedance: 12 GW

Gain Nonlinearity : X100

Gain Error Drift: X100

Common Mode Rejection: X100

Cutoff Frequency (-3dB): 5 Hz (4 Poles Butterworth, -3dB@5Hz, -80dB@50Hz)

Dimension: 160mm X 100 mm for QTC-200;

SignalPro Series Users Manual 31

100mm X 100mm for QTC-200T

Weight: QTC-200 0.29Kg;

QTC-200T (with enclosure): 0.36Kg

Power Consumption: +5V/20mA typ; +15V/40mA typ; -15V/40mA typ

Temperature Range: 0 ~ +70°C

5 QTC-250 RTD Signal Conditioning Module

QTC-250 Features

SignalPro Series Users Manual 32



Eight channel Resistor Temperature Detector (RTD)



On board low-pass filter for each channel (-80dB @ 50Hz)



Per channel jumper selectable excitation current source of 1mA, 0.5mA or 0.25mA



Supports 2, 3 and 4 wire RTD configurations



Up to 256 channels can be configured in a system



Terminal block for quick, easy signal connections

The QTC-250 is an eight channel Resistance Temperature Detector (RTD) input signal
conditioning module. Each channel is equipped with separate instrument amplifiers, three
excitation cur rent source options and a fourth ord er low pass f ilter . Up to thirty- two QTC-250
modules can be configured in an Omega signal conditioning and data acquisition system for a
total of 256 analog input channels. The QTC-250 can also be coupled wi th other modules in
Omega’s SignalPro™ series to provide a versatile data acquisition system.

The QTC-250 module consists of two circuit boards: the QTC-250 interface board and the
QTC-250T terminal board. The interface board is a standard 3U size board which can be
mounted in the QTE-7, QTE-14 or QTC-250-PCS data acquisition enclosures. The QTC-250T
terminal board contai ns the RTD i nput screw bl ocks, channel gain sel ect switches and channel
excitation current sources. T his two board configuration allows qui ck and easy connection of
the RTD lead wires. After the initial configuration of the interface board, it can be mounted in
a data acquisition enclosure and will rarely require removal. All connections are completed on
the screw terminals of the portable QTC-250T, which is then plugged into the QTC-250
interface board and secured using two thumb screws. (See Figure 5-1).

QTC-250T
Terminal Block

Figure 5-1. RTD Signal Conditioning Module

QTC-250-PCS

QTE-7

QTC-250
Interface Bo a rd

5.1 Circuit Board Description

5.1.1 QTC-250 Interface Board Description

SignalPro Series Users Manual 33

The QTC-250 interface board shown in Figure 5-1 can be mounted in SignalPro series data
acquisition racks and enclosures. (See Chapter 2 for information on SignalPro series racks).
Each rack enclosure i s equipped wi th a DIN-4 8 female connector which mate s to the QTC-250
and other SignalPro series signal conditioners. The rack also contains a standard D37
connector which attaches to the host computer data acquisition adapter.

Eight RTD input channels are provided by multiplexing a single main A/D channel off the
host computer data acquisition adapter. The multiplexer on the QTC-250 scans the eight RTD
input channels sequentially and connects each input to the single main A/D channel. The
eight multipl exed input channe ls may b e mapped back to any main A/D channel on the data
acquisition adapter depending on the configuration of jumper J10. Two interface boards may
share one single ended A/D input from the host computer to provide a maximum of 16
multiplexed channels per main A/D channel. Multiplexing of all 16 main A/D channels from
the host computer results in a maximum of 256 A/D input channels, (16 x 16), per data
acquisition adapter.

5.1.2 QTC-250T Terminal Board Description

The QTC-250T terminal board shown in Figure 5-2 contains the input terminal blocks,
excitation current sources and input gain amplifiers for each of the eight RTD inputs. The
terminal board DIN-48 female connector plugs into the QTC-250 interface board and is
equipped with a strain relief bracket to secure external RTD wiring.

ST1

I­R­R+
I+

I­R­R+
I+

I­R­R+
I+

I­R­R+
I+

I­R­R+
I+

I­R­R+
I+

I­R­R+
I+

I­R­R+
I+

J8 - RTD8

J7 - RTD7
J6 - RTD6

J5 - RTD5

J4 - RTD4
J3 - RTD3

J2 - RTD2
J1 - RTD1

Figure 5-2. QTC-250T Terminal Board

5.2 Hardware Configuration

For system configuration options see Chapter 1: SignalPro Series Overview, section 1.3:

SignalPro Series Users Manual 34

Hardware Configuration.

5.2.1 QTC-250 Interface Board Configuration

Figure 5-3 depicts the location of the main A/D channel and board selection jumpers (J9/J10).
System configuration options for J9 and J10 are discussed extensively in Chapter 1, section 1.3.

Board Selection Jumper

J9

Main A/D Channel

Selection Jumper J10

Figure 5-3. QTC-250 Interface Board Jumper Locations

5.2.2 QTC-250T Terminal Board Configuration

The QTC-250T terminal board contains the excitation current selecti on jumpers and the input
gain selecti on switches for each of the eight RTD inputs. The user must configur e two settings:
Input gain (GAI N) and ex citati on current source (I ). The gai n and curre nt source settings are
determined according to the following two considerations:

I * RRTDMAX * GA IN shoul d b e as cl ose as possi ble to, bu t not ex ceed , the f ull scale value of
10 Volts, where RRTDMAX is the maximum RTD r esistance in the specific measuring rang e.
The excitation current “I” should be the smallest possible value, (0.25mA, 0.5mA or 1.0mA),
that will satisfy the first consideration.

Note that resistive heating must be consider e d w he n determining the excitati on current source
amplitude. The RTD dissi pates power at the ra te of Power = I x R, where I is the excitati on

2

current and R is the RTD resi stance. The heat genera ted by the excitation cur rent through the
RTD is a source of error in temperature measurements. Since lower current options will
generate less heat, a combination of low current with a high A/D input gain is desirable.

Table 5-1 lists the suggested gain and excitation current values for all supported RTD types.

9.81

10

0.25 mA

1133.158/ 3922.784

-100 to 200

1,816.81(0.00527)

9.81

10

0.5 mA

566.576 / 1961.381

-100 to 200

908.4 (0.00527)

6.51

10

0.5 mA

372.789 / 1301.86

-100 to 200

604 (0.00518)

9.51

100

0.25 mA

66.6 / 380.31

-80 to 260

120 (0.00672)

5.58

100

0.25 mA

69.528 / 223.221

-60 to 180

100 (0.00618)

1.91

100

1.0 mA

5.128/ 19.116

-100 to 260

9.035 (0.00427)

7.84

10

0.25 mA

185.201 / 3137.08

-200 to 600

1,000 (0.00385)

7.84

10

0.5 mA

92.6 / 1568.54

-200 to 600

500 (0.00385)

7.47

10

0.5 mA

79.881 / 1494.393

-200 to 600

470 (0.00392)

6.27

10

1.0 mA

37.04 / 627.416

-200 to 600

200 (0.00385)

9.39

100

0.25 mA

18.52 / 375.704

-200 to 800

100 (0.00385)

8.36

100

1.0 mA

4.334 / 83.575

-200 to 630

25.5 (0.00392)

Full

Gain

Excitation

Resistance

Temperature

RTD Types

SignalPro Series Users Manual 35

W @0°C(a)

1

Platinum

Copper

Nickel

Range

(°C)

Range

(W )

Current

mA

Setting

2

Scale

Output

(Volts) 3

Nickel-Iron

Notes:

1. (a) is the temperature coefficient in W / W / º C .

2. The gai n setting li sted in Ta ble 5-1 is the hardw are setting f or each supported RTD sensor.

If using DaqEZ, the QTC-250 module gain should be set to 1. The hardware configuration,
(gain and current settings), for each RTD channel will be determined by the DaqEZ signal
conditioner database.

3. The full scale output is from the QTC-250 to the data acquisition card.

5.2.2.1 A/D Gain Selection Switches
The A/D input gain for each of the RTD inputs is individually selectable using SW1 and SW2
as shown in Figure 5-4. Each of the input amplifiers can be configured for gains of x1, x10 or
x100. Configuring the gain setting on the QTC-250T terminal board input amplifiers will
result in less signal noise than using the A/D configuration options available on the data
acquisition adapter in the host computer.

Table 5-1. Suggested Gain and Excitation Current Values for Supported RTD Types

SW1

SignalPro Series Users Manual 36

12345678

ON

RTD5

SW2

12345678

ON

RTD1

Gain = X1

(factory default)

RTD6

RTD7

RTD8

Gain = X10 Gain = X100

RTD2

RTD3

RTD4

Figure 5-4. A/D Gain Selection Switches

5.2.2.2 Excitation Current Selection Jumpers
The QTC-250T provides a stable, constant current source for each of the eight RTD input
channels. The excitation current value of 1.0mA, 0.5mA or 0.25mA for each channel can be
selected using jumper blocks J1 through J8 as shown in Figure 5-5.

RTD Exci tation Current Sele cti on J umpe r s

J1 - J8

(configures RTD1 - RTD8 respectively)

1.0 mA

(factory default)

0.5 mA

0.25 mA

Figure 5-5. Excitation Current Selection Jumpers

5.3 RTD Measurements

SignalPro Series Users Manual 37

5.4 Basic Principles

The basic principle behind RTD measurements is that resistance of an RTD increases with
temperature. By supplying the RTD with a constant current source and measuring the voltage
drop across the RTD, the change in resistance can be monitor ed. The re lationship betw een the
change in temperature and the change in RTD resistance can be defined as follows:

∆T→∆R = ∆V ÷ I

RTD RTD

where:

∆T = the change in temperature
∆R = the change in RTD resistance

RTD

∆V = the voltage drop across the RTD

RTD

I = the RTD excitation current source value

Note: RTD resistance is measured in units of voltage or current where the current amplitude
from the QTC-250 is constant.

5.4.1 Two-Wire RTD Measurements

The configuration of a two-wire measurement circuit is shown in Figure 5-6. The RTD
resistance in this circuit is read at the current source. If the lines connected to the RTD are
short, this method may b e acceptable. H owever, this method is g enerally inaccur ate since the
resistance and thermal heating characteristics of long lead wires ( ) connected to the RTD

R

line

introduce some measurement error.

R

line

I ­R ­I +

RTD

Excitation
Current

R +

R

line

Strain Relief

Bracket

RTD

Terminal Block

Figure 5-6. Two-Wire RTD Measurement

5.4.2 Three-Wire RTD Measurements

SignalPro Series Users Manual 38

The configuration of a three-wire measurement circuit is shown in Figure 5-7. T he advantage
of this circui t over the two-wire method i s the elimination of one current car rying lead w ire.
However, the resistance and thermal heating characteristi cs of the remaining lead wir e (R )

line

to the RTD may still introduce some measurement error.

R

line

I -

RTD

Excitation

Current

R ­I +

R

R

line

line

Strain Relief

Bracket

RTD

Terminal Block

R +

Figure 5-7. Three-Wire RTD Measurement

5.4.3 Four-Wire RTD Measurements

The configuration of a four-wi re measurement circuit is shown in Figure 5-8. The advantage
of this circuit over the previous two and three-wire methods is that greater accuracy is
obtained. By measuring the change in the RTD voltage d rop directly at the RTD resistor, the
error introduced from the lead wires (R ) to the RTD is removed. The measurement error
introduced due to resistance of the A/D lead wires (R ) is insignificant. The input

line

lead

impedance of the A/D is very high and thus minimizes current flow through the lead wires.

R

line

R

line

I -

RTD

Excitation

Current

R ­I +
R +

R

line

R

line

Strain Relief

RTD

Terminal Block

Bracket

Figure 5-8. Four-Wire RTD Measurement

5.5 QTC-250/QTC-250T Specifications

Connector: DIN-48 male, mates with QTE-7, QTE-14, and QTC-250-PCS

SignalPro Series Users Manual 39

Signal Connection: DIN-48 female, mates screw terminal block for easy connection

Number of Channels: 8

RTD type: Platinum 25.5W, 100W, 200W, 470W, 500W, 1000W

Copper 10W

Nickel 100W, 120W

Nickel-Iron 604W, 908.4W, 1816.81W

Accuracy and Resolution:

Type

100 W Platinum -100°C to +600°C 0.4 °C 0.3 °C/ 0.1 °C

120 W Nickel 0°C to 260°C 0.15 °C0. 3 °C/ 0.1 °C

Excitation Current: 1.0 mA, 0.5mA, 0.25 mA

Output Impedance: 1990K Compliance: 10V

Range Accuracy Resolution(12-bit/16-bit)

RTD Configuration: 2-wire, 3-wire, 4-wire

Input Type: Differential

Voltage Input Range: ±10 V

Input Bias Current: ±0.5 pA typ; ±2 pA max

Input Offset Voltage: ± (0.01+0.02/G) mV typ, ± (0.05+0.1/G) mV max

(Adjustable to zero)

Input Offset Drift: ± (0.1+0.5/G) lV/°C typ, ± (0.25+100/G) lV/°C max

Gain Range: 1, 10, 100

Gain Error: X1 0.005% typ, 0.024% max

X10, X100 0.01% typ, 0.024% max

Input Impedance: 10 GW

Gain Non linearity : X1,X10, X100 ± 0.0004% of FS typ, ± 0.001% of FS max

Gain Temp. Coefficient: X1, X10, X100 ± 2.5 ppm/°C typ, ± 10 ppm/°C max,

Common Mode Rejection: X1 80 dB min 99 dB typ

X10 96 dB min 114 dB typ

SignalPro Series Users Manual 40

Cutoff Frequency: 5 Hz (4 Poles Butterworth, -3dB@5Hz, -80dB@50Hz)

Power Requirement: + 5V ±5% 70mA typ

Dimension: 160mm X 100mm for QTC-250; 100mm X 100mm for QTC-250T

Weight: 0.13Kg for QTC-250; 0.35Kg for QTC-250T.

X100 110 dB min 123 dB typ

+15V ±5% 50~70mA typ

-15V ±5% 50mA typ

6 QTC-300 Strain Gage Input Signal Conditioning Module

QTC-300 Features

SignalPro Series Users Manual 41



Four Strain Gage input channels (Up to 256 channels can be configured in system)



Custom configurable excitation current source which readily converts to vendor
specified Strain Gage Excitation Voltage



Supports full, half and quarter bridge gage configurations



On board low-pass filter for each channel (10Hz, 100Hz or 1KHz cut off frequency)



Easy zero and shunt calibration



Terminal block for quick, easy signal connections

The QTC-300 is a four channel strain gage input signal conditioning module. Each channel is
equipped wi th separate instrument ampl ifiers, multiple excitati on current source options and
a fourth order low pass filter. Up to 64 QTC-300 modules can be configured in an Omega
signal condi tioning and data acquisiti on system for a total of 256 analog input channels. Each
channel has selectable gain of 1, 10, 100, 200 or 500. The QTC-300 can also be coupled with
other modules in Omega’s SignalPro series to provide a versatile data acquisition system.

The QTC-300 module consists of two circuit boards: the QTC-300 interface board and the
QTC-300T terminal board. The interface board is a standard 3U size board which can be
mounted in the QTE-7, QTE-14 or QTC-300-PCS data acquisition enclosures. The QTC-300T
terminal b oard conta ins the strai n gage input scre w bl ocks, b rid ge comple tion cir cuits and the
calibration switch. This two board configuration allows quick and easy connection of the
strain gage lead wires. After the initial configuration of the interface board, it can be mounted
in a data acquisition enclosure and will rarely require removal. All connections are completed
on the screw terminals of the portable QTC-300T, which is then plugged into the QTC-300
interface board and secured using two thumb screws. (See Figure 6-1).

QTC-300-PCS

QTE-7

QTC-300 Terminal Board

QTC-300

Interface Board

Figure 6-1. QTC-300 Strain Gage Input Module

6.1 Circuit Board Description

6.1.1 QTC-300 Interface Board Description

SignalPro Series Users Manual 42

The QTC-300 interface board shown in Figure 6-1 can be mounted in SignalPro series data
acquisition racks and enclosures. (See Chapter 2 for information on SignalPro series racks).
Each rack enclosure i s equipped wi th a DIN-4 8 female connector which mate s to the QTC-300
and other SignalPro series signal conditioners. The rack also contains a standard D37
connector which attaches to the host computer data acquisition adapter.

Four strain gage input channels are provided by multiplexing a single main A/D channel off
the host computer data acquisition adapter. The multiplexer on the QTC-300 scans the four
strain gage input channels sequentially and connects each input to the single main A/D
channel. The four multi plexed input channel s may b e mapped back to any main A/D channel
on the data acquisition adapter depending on the configuration of jumper J5. Four interface
boards may share one singl e e nd e d A/D input fr om the host computer to provid e a maximum
of 16 multiplexed channels per main A/D channel. Multiplexing of all 16 main A/D channels
from the host computer resul ts in a maximum of 256 A/D i nput channels, (16 x 16) , per data
acquisition adapter.

6.1.2 QTC-300T Terminal Board Description

The QTC-300T terminal board shown in Figure 6-1 contains the strain gage input terminal
blocks, bridge connection LEDs, calibration switch, offset null potentiometers, excitation
current selection resistor sockets, external ex citation power supply connector and the bridge
completion circuits. The terminal board DIN-48 female connector plugs into the QTC-300
interface board and is equipped with a strain relief bracket to secure external strain gage
wiring.

6.2 Hardware Configuration

SignalPro Series Users Manual 43

For system configuration options see Chapter 1: SignalPro Series Overview, section 1.3:
Hardware Configuration.

6.2.1 QTC-300 Interface Board Configuration

QTC-300

SHC298

J7

J8

J9

J10

J1

J2

J3

J4

F1

F2

F3

F4

U15

SHC298

U23

SHC298

U30

SHC298

U29

BB

J11

BB

J12

J13

BB

J14

BB

J15

J5

CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15

J6

Figure 6-2. QTC-300 Jumper and Filter Block Locations

Figure 6-2 depicts the location of the main A/D channel and board selection jumper blocks
(J5/J6), SSH option jumper block (J11), A/D gain selection jumper blocks (J1 through J4), filter
selection jumper blocks (J12 through J15), filter blocks (F1 through F4) and the AC/DC
coupling selection jumpers (J7 through J10). System configuration options for J5 and J6 are
discussed extensively in Chapter 1, section 1.3.

6.2.1.1 Simultaneous and Sample Hold Jumper ( QTC-300S only)

The simultaneous sample and hold f eature on the QTC-300S eliminates time skew across the

SignalPro Series Users Manual 44

four analog input channels. At the beginning of an A/D channel scan, the SSH device
simultaneously samples all four of the QTC-300S input channels and holds the input signals.
The A/D multiplexer then scans each of the channels in sequence and performs the A/D
conversions one at a time. The defaul t setting for the QTC-300S is SSH di sabl e d . The customer
must enable SSH by changing the jumper position. The QTC-300 does not support SSH and is
also shipped with the jumper set for SSH disabled. (See Figure 6-3).

J11

SSH

QTC-300/300S Default: disables SSH

Figure 6-3. QTC-300/QTC-300S SSH Selection Jumper

6.2.1.2 A/D Gain Selection Jumpers
The A/D input gain for each strain gage channel of the QTC-300 is individually selectable
using jumper blocks J1 through J4 for input channels 0 through 3 respectively. Each of the
input amplifiers is configurable for gains of 1, 10, 100, 200 or 500. Using the A/D gain
selection option provided on the QTC-300 interface board will result in less signal noise than
using the A/D gain selection options available on the data acquisition adapter in the host
computer. Fig ure 6-4 depicts the configuration options and factory default setting for jumper
blocks J1 through J4.

SSH disabled

J1 - J4

1
10

100
200

500

Factory Def a ul t i s Gai n = 20 0

Figure 6-4. A/D Gain Selection Jumpers

6.2.1.3 Filter Selection Jumpers

SignalPro Series Users Manual 45

Jumper blocks J12 through J15 determine whether the low-pass filter options for channels 0
through 3 are used. The factory default is “AP” (All Pass) for all four channels with the
corresponding filter blocks (F1 through F4) empty. When the low-pass filter option is desired,
that channel’s filter module should be installed into the corresponding filter block and the low
pass filter selection jumper should be moved to “LP” (Low Pass). Note that if a filter module
is installed and the selection jumper is set to “AP”, the filter will still have a partial effect on
that channel. Figure 6-5 shows the factory default setting and lists the selection jumper and
filter block that correspond to each channel.

AP: All-Pass/Filter Module Not Installed

CH0 = J12 & F1

AP

LP

CH1 = J13 & F2
CH2 = J14 & F3

LP: Low-Pass/Filter Module Ins talled

CH3 = J15 & F4

Factory Def a ul t i s All-Pass

Figure 6-5. Filter Selection Jumper

6.2.1.4 Filter Block Description
The active filters of QTC-300/QTC-300S employ a uni ty-gain Sallen-Key complex pole-pai r to
implement Butterworth filters. The module provides four 16-pin filter block sockets (F1
through F4) to facilitate easy configuration of different filter types. Each socket has eight
positions to hold resistors or capacitors. The positions are designated as shown in Figure 6-6.

R1A

Part A

Part B

C2A
R2A

C1A

R1B
C2B
R2B
C1B

Part A

Low Pass Filter

Part B

Figure 6-6. Low-Pass Filter Block

Filter cut off frequency is determined by a RC circuit that is configured on the filter block

socket. Omega off ers pre-configure d 4th order Butterworth l ow-pass filter bl ocks for ease in

Customer Specified

FTR-C

1 kHz

FTR-1k

100 Hz

FTR-100

10 Hz

FTR-10

267

536

2.67K

26.7K

53.6K

R1B

102

205

1.02K

10.20K

20.50K

R1A

SignalPro Series Users Manual 46

pre-selecting cut off fr equencies. Omega also offers a pre-confi gured fil ter block that is custom
built to customer specifications. (See Table 6-1).

Cut off FrequencyProduct Number

Table 6-1. Omega Pre-configured RC Filter Blocks

Table 6-2 shows Butterworth low-pass filter design examples for four different cutoff
frequencies. The filter block positions in Table 6-2 correspond to the locations previously
depicted in Figure 6-6. To configure different cutoff frequencies and filter types, the user is
advised to follow the instructions in the Burr-Brown® FilterPro™ software package supplied
on the customer CD-ROM.

1kHz500 Hz100Hz10Hz5HzFilter Block

Position

C2A
R2A
C1A

C2B
R2B
C1B

Notes: 0.1uF=100n; 0.01u=10n; 1000P=1n

6.2.1.5 AC/DC Coupling Jumper
Jumpers J7 through J10 select the option of AC or DC coupling for channels 0 through 3
respectively. DC coupling should be used when measuring static signals. Note that sensor
offset is usually not zero in DC coupling mode. AC coupling provides auto zero balanced
voltage reading and drift-free dynamic operation. The default setting is DC coupling as
shown in Figure 6-7.

1.0uF

105.0K

0.47uF

1.0uF

191.0K

0.1uF

Table 6-2. Butterworth Low-Pass Filter Design Examples

J7 = CH0
J8 = CH1
J9 = CH2
J10 = CH3

1.0uF

52.3K

0.47uF

1.0uF

95.3K

0.1uF

DC

1.0uF

5.23K

0.47uF

1.0uF

9.53K

0.1uF

AC

Default: DC

1.0uF

1.05K

0.47uF

1.0uF

1.91K

0.1uF

1.0uF
523

0.47uF

1.0uF

953

0.1uF

Figure 6-7. AC/DC Coupling Jumper

6.2.2 QTC-300T Terminal Board Configuration

The QTC-300T terminal board shown in Figure 6-8 contains the strain gage input terminal

CAL

Offset Null

SignalPro Series Users Manual 47

blocks, bridge connection LEDs, calibration switch, offset null potentiometers, excitation
current selection resistor sockets, external ex citation power supply connector and the bridge
completion circuits. The terminal board DIN-48 female connector plugs into the QTC-300
interface board and is equipped with a strain relief bracket to secure external strain gage
wiring.

Bridge Connection LEDs

ST1

E+
S+
S-

SG3

E­E+

S+
S­E-

E+
S+
S­E-

E+
S+
S-

SG0 SG1 SG2

E-

QTC-300T

Termin al Board

Potentiometers

CH3 CH2 CH1 CH0

RSD
RD2

RSC
RC2

RSB
RB2

RSA
RA2

J16

Ext. Excitation

+15-18 VDC

RD4
RD3

RC4
RC3

RB4
RB3

RA4
RA3

Switch

"ON" for Cal

SW1

RMD
RMC
RMB
RMA

CN8

Figure 6-8. QTC-300T Terminal Board

6.2.2.1 Input Terminal Blocks and Bridge Connection LEDs
The input terminal screw blocks provide for quick and easy connection of the strain gage lead
wires. Bl ocks are designated SG0 through SG3 f or channels 0 through 3 respectively. N ote that
E+/E- be side the block s refers to Ex citation positive and negative i nputs and S+/S- ref ers to
Signal positive and negative inputs. Each bridge connection LED illuminates when there is a
strain gage signal connection to it’s respective channel.

6.2.2.2 Calibration Switch
The QTC-300T utilizes a push button switch (SW 1) to sele ct eithe r cali bra tion mode or normal
mode as shown in Figure 6-8. A red LED is used to indicate calibration mode status. The LED
turns OFF in normal mode.

6.2.2.3 Offset Null Potentiometers

The QTC-300T terminal board has an offset null potentiometer for each channel. (See Figure

SignalPro Series Users Manual 48

6-8 for potentiometer locations). With offset null circuitry for each individual channel, the
offset voltage of the strain gage transducer can be easily adjusted for null.

6.2.2.4 Excitation Current Selection Resistor Sockets
The QTC-300T provides a stable, constant current source* for each of the four strain gage
input channels. The excitation current value of 2.0 ~ 20.0mA for each channel can be
configured b y using sel ected resistor val ues in the resistor sockets RMA, RMB, RMC or RMD .
Use the equation shown in Figure 6-9 to determine the appropriate resistor value for the
desired excitation current.

Channel 3

Channel 2

Channel 1

Channel 0

Select 2.0 ~ 20.0mA excitatio n current

RMD

RMC

RMB

RMA

2500

R=

Default:

R = 1 ohm

I = 20.0 mA

using proper resistor value

-124

I

Figure 6-9. Excitation Current Selection

*Note: Excitation Voltage = ( Excitation Current ) x ( Vendor Specified Input Impedance )

6.2.2.5 External Excitation Power Supply Connections
Two connectors are provided for an external excita tion power supply connection as shown in
Figure 6-10. Both connectors accept a power input of +15 ~ 18VDC @ 200mA. No polarity is
required for power connection.

J16

CN8

External Excitation
+15~18VDC

Figure 6-10. External Excitation Power Supply Connections

6.3 Calibration Modes

In order for the QTC-300 module to accurately measure strain, it must first be calibrated using

SignalPro Series Users Manual 49

the DAQCAL utility. Calibration must be completed each time a new sensor is attached to the
QTC-300 module or each time an existing sensor is remounted. Once a sensor is attached and
mounted in a fixed location, it is recommended that calibration of the system be completed
every 30 days to ensure the utmost accuracy of the measurements obtained. (Note that the
DAQCAL utility does not currently support mode (3), shunt calibration, but the hardware is
capable of performing this function).

Two external gain lines (G1 and G0) are used to select one of the four modes depicted in
Figure 6-11. The values of G1 and G0 are software selectable.

Excitation

Current

MUX

MUX

V Out

G1G0: 0 0

(1) Normal Mode

Excitation

Current

RSx

V Out

G1G0: 1 0

(3) Shunt Calibration

IA

G1G0: 0 1

(2) Zero System Offset

Excitation

MUX

IA

Current

20 ohm

0.1%

(4) Excitation Current Mea sur e me nt

Figure 6-11. Calibration Modes

IA

MUX

IA

G1G0: 1 1

6.3.1 Normal Mode

With the calib r a ti on sw i tch SW1 set f or nor mal mode, the str ain gage signa l i s conne cted to the
instrument amplifier (IA) through the multiplexer (MUX) as shown in Figure 6-11 (1). The
input channel multiplexer stays in normal mode for all combinations of the external gain lines
G1 and G0. (The red LED should not be illuminated in this mode).

6.3.2 Calibration Mode

Figure 7-9 (4)

Across 20 ohm 0.1% precision resistor

Current Measurement

1 1

Figure 7-9 (3)

Bridge with one arm shunt to RSX

Shunt Calibration

1 0

Figure 7-9 (2)

Both inputs shorted to ground

Zero Offset Calibration

0 1

Figure 7-9 (1)

Signal from strain gage

Normal

0 0

SignalPro Series Users Manual 50

With the calibra tion switch SW1 set for calibr ation mode there are three modes of strai n gage
calibration:

1. Zero System Offset

As shown in F igure 6- 11 (2) , both of the IA inputs are gr ounded and the IA output should be
very close to zero. If the output is not zero, then the value represents the offset of the data
acquisition system. The total system offset can be adjusted to a zero base line through the
corresponding channel offset null potentiometer. (See Figure 6-8 for offset potentiometer
locations).

2. Shunt Calibration (currently not supported by the DAQCAL utility)

An additional resistor (RSX) is shunted in parallel with one arm of the Wheatstone Bridge as
shown in Figure 6-11(3) . The variabl e “X” corresponds to A, B, C or D for channels 0, 1, 2 or 3
respectively. Thus the additional resistor is installed into resistor sockets RSA, RSB, RSC or
RSD depending on which channel the user is configuring. (See Figure 6-8 for the location of
resistor sockets RSA through RSD).

3. Excitation Current Measurement

The circuit diagram for this mod e is shown in Figure 6-11 (4). The ex citation current can be
measured through the voltage drop across the 20 ohm .1 % precision resistor.

The four calibration modes are summarized as shown in Table 6-3.

FigureInput of IACalibration modeG1:G0

Table 6-3. QTC-300 Calibration Modes

6.4 Strain Gage Measurements

SignalPro Series Users Manual 51

6.4.1 Basic Principles

Strain can be defined as the physical deformation, deflection or change in length of a solid
material that resul ts f rom stre ss. Strai n may be ei ther tensi le ( positive ) causing elonga tion of a
solid material or compressive (negative) causing contraction of a solid material. The strain in a
material cannot be measured directly. It must be computed from other measurable
parameters, one of which is electrical resistance which varies in proportion to strain. A
frequently used circuit for measuring an electrical resistance change is the Wheatstone Bridge
shown in Figure 6-12. The QTC-300 supports full, half and quarter bridge configurations.

6.4.2 Full Bridge Strain Gage Measurements

The full bridge configuration employs four strain gages wired into a bridge. Two of the gages
are subject to tensile str ain and the other two are subject to compressive str ain. An excitation
current is applied by the QTC-300 and as the material being measured changes shape, the
tensile gages increase resistance and the compressive gages decrease resistance. The total
strain is the accumul ati on of all f our strains and is repr esented by a change i n voltage: “Vout”.
(See Figure 6-12).

Excitation

Current

I

+

R4

R3

Vout

Input

Excitation
Voltage

VDC

R1

R2

-

VDC = I x R

R = Bridge Resistance

I = Excitation Current Source Value

Figure 6-12. Full Wheatstone Bridge Strain Gage Measurement

Because it employs active strain gages at all four measurement points, a full bridge
configuration is the best choice for strain measurements. It provides the highest sensitivity and
the greatest output, making noise less of a factor in measurements.

A full bridge strain gage wiring configuration is shown in Figure 6-13. This configuration uses

channel zero (SG0) as an example.

SignalPro Series Users Manual 52

Excitati on

Current

E+/E- = Ex citation positive and negative

S+/S- = Signal posi ti ve a nd ne g ative

E+
S+

V Out

S­E-

QTC-300

SG0

Strain Gage

Terminal Block

Strain Relief

Bracket

Figure 6-13. Full Bridge Wiring Configuration

6.4.3 Half Bridge Strain Gage Measurements

The configuration of a half bridge measurement circuit is shown in Figure 6-14. The user
must insert resistors into the correct sockets to build a Wheatstone Bridge for the strain gage
measurement. The channel zero (SG0) connection depicted in F igure 6-14 uses resistor sock ets
RA3 and RA4. The values of RA3 and RA4 will depend on the half bridge strain gage chosen.
Subsequent channels 1 through 3 use resistor sockets RB3/4, RC3/4 and RD3/4 respectively.
(See Figure 6-8 for resistor socket locations).

Strain Gage

Terminal Block

SG0

E+
S+

S­E-

Bridge Complet ion
Resistors

RA4

Strain Relief

Bracket

RA2

RA3

Figure 6-14. Half Bridge Wiring Configuration

2~20mA

mV Output
To QTC-300

6.4.4 Quarter Bridge Strain Gage Measurements

The configuration of a Quarter Bridge measurement circuit is shown in Figure 6-15. The user

SignalPro Series Users Manual 53

must insert resistors into sockets RA2, RA3 and RA4 to build a Wheatstone Bridge for the
strain gage measurement. The values of RA2, RA3 and RA4 will depend on the quarter bridge
strain gage chosen. Subsequent channels 1 through 3 use resistor sockets RB2/3/4, RC2/3/4
and RD2/3/4 respectively. (See Figure 6-8 for resistor socket locations).

Strain Gage

Terminal Block

SG0

E+
S+

S-

Strain Relief

Bracket

E-

RA2

Bridge
Completion
Resistors

RA4

RA3

Figure 6-15. Quarter Bridge Wiring Configuration

2~20mA

mV Output
To QTC-300

6.5 Configuration Examples

SignalPro Series Users Manual 54

The strain gage vendor will provide specifications for input pressure range, input impedance,
rated excitation voltage and full scale output. The following three examples illustrate how to
compute the sensitivity of the strain gage, how to compute the excitation voltage for the
selected excitation current and how to select the appropriate gain so the strain gage output
voltage stays within the allowable input range of the data acquisition system.

Example 1. A transducer has the following specifications: input pressure range = 100 psi

input impedance = 800 ohms
rated excitation = 10 VDC
full scale output = 100 mV

1) The sensitivity of the transducer is computed:

Sensitivity =

2) If an excitation current of 10mA is chosen by the user, the excitation voltage is then
computed:

Input Impedance x Excitation Current = Excitation Voltage

3) The transducer output is calculated using the excitation voltage and sensitivity:

Excitation Voltage x Sensitivity = Transducer Output

Full Scale Output 100mV

=10mV/V=

Rated Excitation 10V

800W x 10mA = 8V

8V x 10mV/V = 80mV

4) The 0 ~ 80mV transducer output then corresponds to 0 ~ 100 psi input pressure.

5) The g ain setting must be chose n so that when transducer output (computed in step 3 ) is
multiplie d by the gain, the result is within the allowab le -10V ~ +10 V input range of the data
acquisition system. In this example, a gain of 100 mul tiplied by the 80mV transd ucer output

would result in an input of 8V to the data acquisition system, (well within the allowable ±10V
range).

Example 2. A transducer has the following specifications: input pressure range = 200 psi

SignalPro Series Users Manual 55

input impedance = 280 ohms
rated excitation = 5 VDC
full scale output = 100 mV

1) The sensitivity of the transducer is computed:

Sensitivity =

2) If an excitation current of 6mA is chosen by the user, the excitation voltage is then
computed:

Input Impedance x Excitation Current = Excitation Voltage

3) The transducer output is calculated using the excitation voltage and sensitivity:

Excitation Voltage x Sensitivity = Transducer Output

Full Scale Output 100mV

=20mV/V=

Rated Excitation 5V

280W x 6mA = 1.68V

1.68V x 20mV/V = 33.6mV

4) The 0 ~ 33.6mV transducer output then corresponds to 0 ~ 200 psi input pressure.

5) The g ain setting must be chose n so that when transducer output (computed in step 3 ) is
multiplie d by the gain, the result is within the allowab le -10V ~ +10 V input range of the data
acquisition system. In this example, a gain of 200 multiplied by the 33.6mV transducer output
would result in an input of 6.72V to the data acquisition system, (well within the allowable

±10V range).

Example 3. A transducer has the following specifications: input pressure range = 300 psi

SignalPro Series Users Manual 56

input impedance = 4500 ohms
rated excitation = 10 VDC
full scale output = 30 mV

1) The sensitivity of the transducer is computed:

Sensitivity =

2) If an excitation current of 2mA is chosen by the user, the excitation voltage is then
computed:

Input Impedance x Excitation Current = Excitation Voltage

3) The transducer output is calculated using the excitation voltage and sensitivity:

Excitation Voltage x Sensitivity = Transducer Output

Full Scale Output 30mV

=

Rated Excitation 10V

4500W x 2mA = 9V

9V x 3mV/V = 27mV

=3 mV/V

4) The 0 ~ 27mV transducer output then corresponds to 0 ~ 300 psi input pressure.

5) The g ain setting must be chose n so that when transducer output (computed in step 3 ) is
multiplie d by the gain, the result is within the allowab le -10V ~ +10 V input range of the data
acquisition system. In this example, a gain of 200 mul tiplied by the 27mV transd ucer output
would result in an input of 5.4V to the data acquisition system, (well within the allowable

±10V range).

6.6 QTC-300S/QTC-300T Specifications

Connector: DIN-48 male; mates with QTE-7, QTE-14 and QTC-300-PCS

SignalPro Series Users Manual 57

Signal Connection: DIN-48 female, mates screw terminal block for easy connection.

Number of Channels: 4

Excitation Current: 10 mA, 20 mA, 2-20 mA ( 2.5/(124+Rx) )

Rx: 0 - 1126 ohm

Output Impedance: 1900K Compliance: 12V

Power Requirement: +5V ±5% 300mA typ,

+15V ±5% 50 ~ 150mA typ (depends on excitation current)

-15V ±5% 50mA typ

External Excitation Power: +15V ~ +18V @ 200mA

Bridge Types: Full bridge ( 4-wire), half bridge ( 3-wire), quarter bridge (2-wire)

Bridge Resistors: On board resistor socket for each arm on each channel

Input Type: Differential

Over Voltage Input: ±30 VDC

Calibration: Zero System Offset, Shunt and Excitation Current Measurement.

Voltage Input Range: ±10 VDC, ±1VDC, ±100 mVDC, ±50 mVDC, ±20 mVDC

Input Bias Current: 20 pA typ, 100 pA max

Input Offset Voltage: ± (0.1+1/G) mV typ, ± (0.5+5/G) mV max (Adjustable to zero)

Input Offset Drift: ± (2+20/G) lV/°C typ, ± (5+100/G) lV/°C max

Gain Range: 1, 10, 100, 200, 500

Gain Accuracy: X1 0.002% typ, 0.04% max

X10 0.01% typ, 0.1% max

X100 0.02% typ, 0.2% max

X200 0.04% typ, 0.4% max

X500 0.1% typ, 1% max

Input Impedance: 200 GW

Gain Nonlinearity : X1 ± 0.001% of FS typ, ± 0.01% of FS max

X10 ± 0.002% of FS typ, ± 0.01% of FS max

SignalPro Series Users Manual 58

Gain Temp. Coefficient: X1 ± 3 ppm/°C typ, ± 20 ppm/°C max

Common Mode Rejection: X1 70 dB typ, 90 dB max

X100 ± 0.004% of FS typ, ± 0.02% of FS max

X200 ± 0.006% of FS typ, ± 0.02% of FS max

X500 ± 0.01% of FS typ, ± 0.04% of FS max

X10 ± 4 ppm/°C typ, ± 20 ppm/°C max

X100 ± 6 ppm/°C typ, ± 40 ppm/°C max

X200 ± 10 ppm/°C typ, ± 60 ppm/°C max

X500 ± 25 ppm/°C typ, ± 100 ppm/°C max

X10 87 dB typ, 104 dB max

X100 100 dB typ, 110 dB max

X200 100 dB typ, 110 dB max

X500 100 dB typ, 110 dB max

Low Pass Filter (-3dB): QTC-300-10: 10Hz, QTC-300-100: 100Hz, QTC-300-1K:1Khz

(also user by-passable)

High Pass Filter: 0.28Hz (for AC Coupling)

Simultaneous Sample Hold

Acquisition Time: 10V Step to 0.1% 4ls typ, 6ls to 0.01%

Aperture Time: 200 ns

Hold Settling Time: 1ls to 1mV

Hold Droop Rate: 0.03lV/ls

Input Voltage Offset: ±1 mV typ (adjust to zero)

SSH Accuracy: ±0.01% FS Gain Error

Dimension: 160mm X 100mm for QTC-300 or QTC-300S

100mm X 100mm for QTC-300T

Weight: 0.13Kg for QTC-300 or QTC-300S/0.36Kg for QTC-300T

7 QTC-350 Accelerometer/Dynamic Signal Input Module

QTC-350 Features

SignalPro Series Users Manual 59



Four Accelerometer/Dynamic Signal input channels with BNC connections



Up to 256 channels can be configured in a system



Custom configurable excitation current source of 4mA or 2-10mA



DIP switch selectable gain of 1, 2, 4 or 8



On board low-pass or by-pass filter for each channel



(10Hz, 100Hz or 1KHz cut off frequency)



Jumper selectable AC or DC coupling



Supports PCB® ICP® type and Analog Devices® Monolithic type accelerometers



Simultaneous Sample and Hold Option (QTC-350S)

The QTC-350 is a four channel accelerometer/dynamic signal input module. Each channel is
equipped with a separate instrument amplifier, low pass filter and a custom configurable
current source. Up to sixty-four QTC-350 modules can be configured in an Omega signal
conditioning and data acquisition system for a total of 256 analog input channels. The
QTC-350 can also be coupled with other modules in Omega’s SignalPro series to provide a
versatile data acquisition system.

The QTC-350 signal conditioning module shown i n Figure 7-1 consists of a single standard 3U
size interface board which mounts in the QTE-7, QTE-14 or QTC-350-PCS data acquisition
enclosures. The QTC-350 is equi pped wi th four standard BNC connectors each wi th a jumper
selectable option of either ICP® or d ynamic sensor input. The QT C-350 can also be specially
equipped with a Simultaneous Sample and Hold feature for each channel, (QTC-350S).

QTC-350-PCS

QTE-7

QTC-350 Interface Board

Figure 7-1. QTC-350 Accelerometer/Dynamic Signal Input Module

7.1 Circuit Board Description

The QTC-350 interface board shown in Figure 7-1 can be mounted in SignalPro series data

SignalPro Series Users Manual 60

acquisition racks and enclosures. (See Chapter 2 for information on SignalPro series racks).
Each rack enclosure i s equipped wi th a DIN-4 8 female connector which mate s to the QTC-350
and other SignalPro series modules. The rack also contains a standard Omega D37 connector
which attaches to the host computer data acquisition adapter.

Four accelerometer or dynamic signal input channels are provided by multiplexing a single
main A/D channel off the host computer data acquisition adapter. The multiplexer on the
QTC-350 scans the four accelerometer input channels sequentiall y and connects each input to
the single main A/D channel. The four multiplexed input channels may be mapped back to
any main A/D channel on the data acquisition adapter depending on the configuration of
jumper J15. Four interface boards may share one single ended A/D input from the host
computer to provide a maximum of 16 multiplexed channels per main A/D channel.
Multiplexi ng of all 16 main A/D channel s from the host computer results in a maximum of
256 A/D input channels, (16 x 16), per data acquisition adapter.

7.2 Hardware Configuration

For system configuration options see Chapter 1: SignalPro Series Overview, Section 1.3:
Hardware Configuration.

7.2.1 QTC-350 Interface Board Configuration

Figure 7-2 depicts the location of the main A/D channel and board selection jumper blocks
(J14 and J15), SSH option jumper block (J13), filter selection jumpers (J9 through J12), filter
blocks (F1 through F4), coupling selection jumper blocks (J5 through J8), sensor type selection
jumper blocks (J1 through J4), input gain selection switch (SW1) and the excitation current
selection resistor sockets (R6, R8, R9 and R10).

QTC-350

CHA
1

CHB
2

CHC
3

CHD
4

J2

J3

J1

J4

R6

R8

R9

R10

SW1

CHD
CHC
CHB
CHA

1 2 3 4 5 6 7 8

N

O

J6

F1

J5

J7

J8

F3

F4

J9

F2

J10

J11

J12

J15

J13

J14

Figure 7-2. QTC-350 Interface Board Jumper and Switch Locations

7.2.1.1 Simultaneous Sample and Hold Jumper (QTC-350S only)

The simultaneous sample and hold feature eliminates time skew errors across the four analog

SignalPro Series Users Manual 61

input channels. At the beginning of an A/D channel scan, the SSH device simultaneously
samples all four of the QTC-350S input channels and holds the input signals. The A/D
multiplexer then scans each of the channels in sequence and performs the A/D conversions
one at a time.

The default setting for the QTC-350S is SSH disabled. The customer must enable SSH by
changing the jumper position. The QTC-350 does not support SSH and is also shipped with
SSH disabled. (See Figure 7-3).

J13

SSH

QTC-350/350S Default: disables SSH

Figure 7-3. QTC-350/QTC-350S SSH Selection Jumper

No SSH

7.2.1.2 Filter Selection Jumpers
Jumper blocks J9 through J12 determine whether the low-pass filter options for channels A
through D are used. The factory default is “AP” (All Pass) for all four channels with the
corresponding filter blocks (F1 through F4) empty. When the low-pass filter option is desired,
that channel’s filter module should be installed into the corresponding filter block and the low
pass filter selection jumper should be moved to “LP” (Low Pass). Note that if a filter module
is installed and the selection jumper is set to “AP”, the filter will still have a partial effect on
that channel. Figure 7-4 shows the factory default setting and lists the selection jumper and
filter block that corresponds to each channel. (See Figure 7-2 for channel locations).

CHA=J10/F2
CHB=J11/F3
CHC=J12/F4
CHD=J9 /F1

AP

LP

AP: All-Pass/Filter Module Not Installed

LP: Low-Pass/Filter Module Ins talled

Factory Def a ul t i s All-Pass

Figure 7-4. Filter Selection Jumpers

7.2.1.3 Filter Block Description

The active filters of QTC-350/350S employ a unity-gain Sallen-Key complex pole-pair to

Customer specified

FTR-C

1 kHz

FTR-1k

100 Hz

FTR-100

10 Hz

FTR-10

267

536

2.67K

26.7K

53.6K

R1B

102

205

1.02K

10.20K

20.50K

R1A

SignalPro Series Users Manual 62

implement Butte rwor th filter s. Four 1 6-pi n filter block sockets (F 1 through F4) ar e provide d to
facilitate easy configuration of different filter types. Each socket has eight positions to hold
resistors or capacitors. The positions are designated as shown in Figure 7-5.

R1A

Part A

Part B

C2A
R2A

C1A

R1B
C2B
R2B
C1B

Part A

Low Pass Filter

Part B

Figure 7-5. Filter Block Socket Designations

Filter cut off frequency is determined by a RC circuit that is configured on the filter block
socket. Omega offers pre-configured 3rd order Butterworth low-pass filter blocks for ease in
pre-selecting cut off fr equencies. Omega also offers a pre-confi gured fil ter block that is custom
built to customer specifications. (See Table 7-1).

Cut off FrequencyProduct Number

Table 7-1. Omega Pre-configured RC Filter Blocks

Table 7-2 shows Butterworth low-pass filter design examples for five different cutoff
frequencies. To configure different cutoff frequencies and filter types, the user is advised to
follow the instructions in the Burr-Brown® FilterPro™ software package supplied with the
customer CD-ROM.

1kHz500Hz100Hz10Hz5HzFilter Block

Position

C2A
R2A
C1A

C2B
R2B
C1B

1.0uF

105.0K

0.47uF

1.0uF

191.0K

0.1uF

1.0uF

52.3K

0.47uF

1.0uF

95.3K

0.1uF

1.0uF

5.23K

0.47uF

1.0uF

9.53K

0.1uF

1.0uF

1.05K

0.47uF

1.0uF

1.91K

0.1uF

1.0uF
523

0.47uF

1.0uF

953

0.1uF

Notes: 0.1uF=100n; 0.01u=10n; 1000P=1n

Table7-2. Butterworth Low-Pass Filter Design Examples

7.2.1.4 Sensor Type Selection and AC/DC Coupling Jumpers

The QTC-350 is equipped with four BNC connectors for diff erential signal input. E ach input

SignalPro Series Users Manual 63

can be connected to either ICP® type or Dynamic (DYN) type sensors depending on the
configuration of j umpers J1 through J4. Figure7- 6 shows channel versus jumper assignment
and the factory default setting.

J1=CHA
J2=CHB
J3=CHC
J4=CHD

ICP

Default: ICP

DYN

Figure 7-6. Sensor Type Selection Jumper

Each QTC-350 channel is al so equipped with a jumper selectable option of either DC or AC
coupling. Figure 7-7 shows channel versus jumper assignment and the factory default setting.

J7=CHA
J8=CHB

J5=CHC

Default: DC

DC AC

J6=CHD

Figure 7-7. AC/DC Coupling Selection Jumper

7.2.1.5 A/D Gain Selection Switch
The A/D input gain for each of the accelerometer or dynamic inputs is individually selectable
using SW1 as shown in Figure 7-8. Each of the input amplifiers can be configured for gains of
x1, x2, x4 or x8.

SW1

1 2 3 4 5 6 7 8

O

N

CHA CHB CHC CHD

(factory default)

Gain = X1

Gain = X2

Figure 7-8. A/D Gain Selection Switch

Gain = X4 Gain = X8

Up to four QTC-350 interface boards may share one single ended A/D input from the host

computer to provide a maximum of sixteen multiplexed channels per main A/D channel.

151413

12

Board 4

11109

8

Board 3

765

4

Board 2

321

0

Board 1

CHD

CHC

CHB

CHA

QTC-350

SignalPro Series Users Manual 64

Table7-3 shows which logical channels will be affected by SW1 gain settings. For example, in a
four board configuration, setting SW1 positions 3 and 4 (CHB) for a gain of x2 will cause
logical channels 1, 5, 9 and 13 to all have a gain of x2.

Table 7-3. Expansion Channels versus A/D Gain Selection

7.2.1.6 Excitation Current Selection Resistors
The QTC-350 provides a stable, constant current source for each of the four accelerometer
input channels. The excitation current value of 2.0 - 10.0mA for each channel can be
configured by using selected resistor values in the resistor sockets R6, R8, R9 or R10. (See
Figure 7-2 for specific location of resistor sockets). Use the equation shown in Figure 7-9 to
determine the appropriate resistor value for the desired excitation current.

2500

R =

- 250

I

Default: R = 375 ohms

I = 4.0 mA

R6

CHA

CHB

R9

R8

CHC

R10

Figure 7-9. Excitation Current Selection

CHD

7.3 Field Wiring

An ICP® sensor configuration is shown in Figure 7-10 and a dynamic sensor configuration is

SignalPro Series Users Manual 65

shown in Figure 7-11.

ICP

2~10mA

DYN

4.7uF
1M ohm

QTC-350

Figure 7-10. ICP Sensor Configuration

Note that for a dynamic sensor configuration, the user needs to provide an external +5V
power supply as shown in Figure 7-11.

ICP

2~10mA

+5V

DYN

0~5V

Sensor

4.7uF
1M ohm

QTC-350

Figure 7-11. Dynamic Sensor Configuration

When configuring sensors, a long cable length may affect frequency response and intr oduce

850 ft

340 ft

10.0 kHz

1700 ft

680 ft

5.0 kHz

8500 ft

3400 ft

1.0 kHz

Excitation Current = 10 mA

Excitation Current = 4 mA

Input Frequency

SignalPro Series Users Manual 66

noise or distortion when insufficient current is available to drive cable capacitance. The cable
length driving capability is dependent on the excitation current value and the frequency of the
signal. Tab le 7-4 shows the maximum dri ving capability of a coaxial cable with a capacitance
of 30pf/ft. at various input frequencies.

Table 7-4. Maximum Driving Capability of Coaxial Cable with 30pf/ft. Capacitance

7.4 QTC-350/QTC-350S Specifications

Connector: DIN-48 male; mates with QTE-7, QTE-14 and QTC-350-PCS

SignalPro Series Users Manual 67

Signal Connection: BNC connector

Number of Channels: 4

Power Requirements: +5V ±5% @400mA, +15V±5% @50mA, -15V ±5% @50mA

Excitation Current: 4 mA, 2-10 mA

2500/(250.0+Rx) where Rx: 0 - 1000 ohm

Output Impedance: 1900K

Compliance: 25V

Simultaneous Sample Hold (QTC-350S only):

Acquisition Time: 10V Step to 0.1% 4ls typ, 6ls to 0.01%

Aperture Time: 200 ns

Hold Settling Time: 1ls to 1mV

Hold Droop Rate: 0.03lV/ls

Input Voltage Offset: ±1 mV typ (adjust to zero)

SSH Acuracy: ±0.01% FS Gain Error

AC Coupling Frequency: 0.28Hz (-3dB)

Accelerometer input: Two wire BNC connection

Maximum Voltage Input: ±30 V

Voltage Input Range: ±10 V, ±5 V, ±2.5 V, ±1.25 V

Input Bias Current: ±0.5 pA typ; ±5 pA max

Input Offset Voltage: ± (0.025+0.03/G) mV typ, ± (0.125+0.5/G) mV max

(Adjustable to zero)

Input Offset Drift: ± (0.1+0.5/G) lV/°C typ, ± (0.25+100/G) lV/°C max

Gain Range: 1, 2, 4, 8

Gain Error: X1 0.005% typ, 0.024% max

X2, X4, X8 0.01% typ, 0.024% max

Input Impedance: 10 GW

Gain Nonlinearity : ± 0.00024% of FS typ, ± 0.004% of FS max

Gain Temp. Coefficient: ± 2.5 ppm/°C typ, ± 10 ppm/°C max,

SignalPro Series Users Manual 68

Common Mode Rejection: X1 75 dB min, 88 dB typ

X2 80 dB min , 94 dB typ

X4 85 dB min , 100 dB typ

X8 89 dB min , 106 dB typ

Low-pass Filter: Optional (10Hz, 100Hz, or 1KHz)

Dimension: 160mm X 100mm

Weight: 0.17Kg

Temperature Range: 0 ~ +70°C

8 QTC-400 Universal Current/Voltage Input Module

QTC-400 Features

SignalPro Series Users Manual 69



Sixteen Differential or Single-ended input channels



User configurable for either Current or Voltage input



Programmable Gain Selection of 1, 2, 4 or 8



4-20 mA or 0-20 mA current measurement



Voltage input range of ±1.25, 2.5, 5 or 10 VDC



Terminal block for quick, easy signal connections

The QTC-400 is a sixteen channel universal current and voltage input module that provides
either single-ended or differential inputs to the data acquisition system. Up to sixteen
QTC-400 modules can be configured in an Omega signal conditioning and data acquisition
system for a total of 256 analog input channel s. The QTC-400 can also be coupled with other
modules in Omega’s SignalPro series to provide a versatile data acquisition system.

The QTC-400 universal current/voltage input module consists of two circuit boards: the
QTC-400 interface board and the QTC-400T terminal board. The interface board is a standard
3U size board which can be mounted in the QTE-7, QTE-14 or QT C-400-PCS data acquisition
enclosures. The terminal board contains the input screw blocks for the sixteen voltage or
current inputs. This two board configuration allows quick and easy connection of the input
lead wires. After the initial configuration of the interface board, it can be mounted in a data
acquisition enclosure and will rarely require removal. All connections are completed on the
screw terminals of the portable QT C-400T, which is then plugged in to the interface board and
secured using two thumb screws. (See Figure 8-1).

QTC-400-PCS

QTE-7

QTC-400T Terminal Board

Figure 8-1. QTC-400 Universal Voltage/Current Module

QTC-400 Interface Board

8.1 Circuit Board Description

8.1.1 QTC-400 Interface Board Description

SignalPro Series Users Manual 70

The QTC-400 interface board shown in Figure 8-1 can be mounted in SignalPro Series data
acquisition racks and enclosures. (See Chapter 2 for information on SignalPro Series racks).
Each rack enclosure i s equipped wi th a DIN-4 8 female connector which mate s to the QTC-400
and other SignalPro series signal conditioners. The rack also contains a standard Omega D37
connector which attaches to the host computer data acquisition adapter.

Sixteen voltage or current input channels are provided by multiplexing a single main A/D
channel off the host computer data acquisition adapter. The multipl exer on the QTC-400 scans
the sixteen analog input channel s sequenti al l y and connects each input to the single mai n A /D
channel. The sixteen multiplexed input channels may be mapped back to any main A/D
channel on the data acquisition adapter depending on the configuration of jumper J1.
Multiplexi ng of all 16 main A/D channel s from the host computer results in a maximum of
256 A/D input channels, (16 x 16), per data acquisition adapter.

8.1.2 QTC-400T Terminal Board Description

The QTC-400T terminal board contains the input terminal blocks for each of the sixteen
voltage/current inputs. The terminal board DIN-48 female connector plugs into the interface
board and is equipped with a strain relief bracket to secure external input wiring.

8.2 Hardware Configuration

8.2.1 QTC-400 Interface Board Configuration

8.2.1.1 Current Measurement Resistors/Channel Input Terminals
The QTC-400 is shipped with 20 ohm ±0.1% precision resistors which can b e used to measure
current in the range of 0 to 20mA. Insert a resistor into the socket by each channel input
terminal block as shown in Figure 8-2.

CH0

R11

-

Optional Current
Measurement Resistor
Socket

Figure 8-2. Current Measurement Resistor Sockets

+

Voltage / C ur rent

Terminal Block

8.2.1.2 Analog Ground Option Jumper

The QTC-400 differential input signals can be connected to analog ground for reference

SignalPro Series Users Manual 71

purposes using jumper blocks J2 and J3. The positive and negative side of each differential
signal optionally connects to analog ground as shown in Figure 8-3.

CH0 - Ch15

into MUX

+

PGAMUX

_

Programmable Gain

J2

1M

1M

Default settings are:

CH+ not grounded (J2: 2-3)

Amplifier

J3

CH- grounded via 1M (J3: 1-2)

Figure 8-3. Analog Ground Option Jumper

8.3 QTC-400/400T Specifications

0 ~ +70 °C

Temperature Range:

0.13 Kg for QTC-400

Weight:

160mm x 100mm for QTC-400

Dimension:

-15V ±5% @17mA

+15V ±5% @17mA

+5V ±5% @20mA

Power Requirements:

± (3+50/G) lV/°C typ, ± (24+240/G) lV/°C max

Offset Drift:

± (0.5+5/G) mV typ,± (2+24/G) mV max

Offset Voltage @ 25°C:

80 db min

CMMR:

5 ls

Overload Recovery time:

2 ls

Settling Time (0.01%)

10 V/ls min, 20 V/ls typ

Slew Rate:

± 0.002% typ,± 0.015% max

Gain Non linearity:

± 0.05% typ, ± 0.25% max

Gain Accuracy:

±30 VDC

Over Voltage Protection:

±10 VDC, ±5 VDC, ±2.5 VDC, ±1.25 VDC

Voltage Input Range:

1, 2, 4, 8

Gain Range:

16 differential or 16 single-ended

Number of Channels:

DIN-48 female, mates screw terminal block for easy connection

Signal Connection:

DIN-48 male, mates with QTE-7, QTE-14, and QTC-400-PCS

Connector:

SignalPro Series Users Manual 72

100mm x 100mm for QTC-400T

0.36 Kg for QTC-400T

9 QTC-450 Low/High Bandpass Filter Input Module

QTC-450 Features

SignalPro Series Users Manual 73



Four channel Active Filter module with Simultaneous Sample and Hold (SSH)



Low-pass, high-pass, band-pass or by-pass filter option for each channel



Differential signal inputs on each channel via BNC connectors



Jumper selectable gain of 0.5, 5, 50, 100 or 250



Software included for active filter design and RC selection



Up to 256 channels can be configured in a system

The QTC-450 is a four channel active filter module with a simultaneous sample and hold
option. Each channel has an independent instrumentation amplifier with jumper selectable
gain of 0.5, 5, 50, 100 or 250 and a filter option of low-pass, high- pass, band-pass or by-pass.
Up to sixty-four QTC-450 boards can be configured in a SignalPro signal conditioning and
data acquisition system to provide 256 channels of analog input. The QTC-450 can also be
coupled with other modules in Quatech’s SignalPro series to provide a flexible data
acquisition system. (See Figure 9-1).

The QTC-450 signal conditioning module consists of a single standard 3U size interface board
which mounts in the QTE-7, QTE-14 or QTC-450-PCS data acquisition enclosures. The
QTC-450 is equipped w ith f our standard BN C connectors for di fferential si gnal inputs to each
of the filtered channels.

Two variations of the QTC-450 are also available. The QTC-450F has the same signal filtering
options as the QTC-450, but does not include the SSH feature. The QTC-450S offers four
channel SSH signal input, but does not include the active filtering capabilities of the QTC-450.

Figure 9-1. QTC-450 Low/High Bandpass Filter Input Module

9.1 Circuit Board Description

The QTC-450 interface board shown in Figure 9-1 can be mounted in SignalPro series data

SignalPro Series Users Manual 74

acquisition racks and enclosures. (See Chapter 2 for information on SignalPro Series racks).
Each rack enclosure i s equipped wi th a DIN-4 8 female connector which mate s to the QTC-450
and other SignalPro series signal conditioners. The rack also contains a standard Omega D37
connector which attaches to the host computer data acquisition adapter.

Four filtered input channels are provided by multiplexing a single main A/D channel off the
host computer data acquisition adapter. The multiplexer on the QTC-450 scans the four
filtered input channels sequentially and connects each input to the single main A/D channel.
The four multiplex ed input channels may be mapped back to any main A/D channel on the
data acquisition adapter depending on the configuration of jumper J11. Four interface boards
may share one single end ed A/D input from the host computer to provide a maxi mum of 16
multiplexed channels per main A/D channel. Multiplexing of all 16 main A/D channels from
the host computer results in a maximum of 256 A/D input channels, (16 x 16), per data
acquisition adapter.

9.2 Hardware Configuration

For system configuration options see Chapter 1: SignalPro Series Overview, Section 1.3:
Hardware Configuration.

9.2.1 QTC-450 Interface Board Configuration

QTC-450

SW1

1 2 3 4 5 6 7 8

O

N

J1-GAIN A

0.5
5
50
100
250

J2-GAIN B

0.5
5
50
100
250

J3-GAIN C

0.5
5
50
100
250

J4-GAIN D

0.5
5
50
100
250

F1

F2

F3

F4

HPBPLP

HPBPLP

HPBPLP

HPBPLP

J5

J9

board 1
board 2
board 3
board 4

BYP

J11

BYP

J6

AD684

BYP

J7

BYP

J8

J10

CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15

Figure 9-2. QTC-450 Jumper Block, Filter Block and Switch Locations

Figure 9-2 depicts the location of the main A/D channel and board selection jumper blocks (J9

and J11), A/D gain selection jumper blocks (J1 through J4), filter selection jumper blocks (J5

SignalPro Series Users Manual 75

through J8), SSH option jumper block (J10), filter blocks (F1 through F4) and the analog
ground option switch (SW1). System configuration options for J9 and J11 are discussed
extensively in Chapter 1, section 1.3.

9.2.1.1 A/D Gain Selection Jumpers
The A/D input gain for each of the four QTC-450 input channels is individually selectable
using J1 through J4 for input channels A through D respectively, (see Figure 12-2 for the
location of channels A through D). Each of the input instrument amplifiers is configurable for
gains of 0.5, 5, 10, 100 or 250. Using the A/D gain selecti on option provided on the QTC-450
interface board will result in less signal noise than using the A/D gain selection options
available on the data acquisition adapter in the host computer. Figure 9-3 depicts the
configuration options and factory default setting for jumper blocks J1 through J4.

J1 - J4

0.5
5

10

100

250

Factory Def a ul t i s Gai n = 0.5

Figure 9-3. A/D Channel Gain Selection Jumpers

9.2.1.2 Filter Selection Jumpers
Jumper block s J5 through J8 select the filter type for input channel s 1 through 4 respectively.
This jumper configuration is dependent on the filter block design installed in sockets F1
through F4. (See section 9.3 for discussion on filter block design). Figure 9-4 depicts the
configuration options and factory default setting for jumper blocks J5 through J8.

Band

Low

ByPass

High

J5 - J8

Factory Defa ul t i s Bypass

Figure 9-4. Filter Selection Jumpers

9.2.1.3 Simultaneous Sample and Hold Jumper

SignalPro Series Users Manual 76

The simultaneous sample and hold feature on the QTC-450 and QTC-450S eliminates time
skew errors across the four analog input channels. At the beg inning of an A/D channel scan,
the SSH device simultaneousl y samples all four of the QTC-450 input channels and hold s the
input signals. The A/D multipl exer then scans each of the channels in sequence and performs
the A/D conversions one at a time. The default setting for signal conditioning system
modules with the SSH feature is J10 open, (SSH enabled), as shown in Figure 9-5. The
QTC-450F does not support SSH and is shipped with J10 shorted (SSH disabled).

J10

Jumper on disables SSH

Figure 9-5. SSH Selection Jumper

9.2.1.4 Filter Blocks
The QTC-450 filter module provides four 16-pin filter block sockets to facilitate easy
configuration of different filter types. Filter block sockets F1 through F4 are assigned to
channels 1 through 4 respectively and each socket has eight positions to hold resistors or
capacitors. The positions are designated as shown in Figure 9-6.

RC1
RC2
RC3
RC4
RC5
RC6
RC7
RC8

RC1
RC2
RC3
RC4
RC5
RC6
RC7
RC8

Figure 9-6. Filter Block Socket Designations

Filter cut off frequency is determined by a RC circuit that is configured on the filter block

Customer Specified

FTRB-C

1 Khz

FTRB-5

500 Hz

FTRB-4

100 Hz

FTRB-3

10 Hz

FTRB-2

5 Hz

FTRB-1

SignalPro Series Users Manual 77

socket. Omega of fers pre-conf igured RC blocks for ease in pre- selecting l ow-pass fil ter cut off
frequencies. (All pre-configured filter blocks are 3rd order Butterworth low-pass filters).
Omega also off ers a pre-conf igured filter block that is custom b uilt to customer spe cificati ons.
(See Table 9-1).

Cut off FrequencyProduct Number

Table 9-1. Omega Pre-configured Filter Blocks

9.2.1.5 Analog Ground Option Switch
The QTC-450 interface board is equipped with four BNC connectors for differential input
signals. Each input (A through D respectively) can be connected to analog ground for
reference purposes via switch block SW1. The positive and negative side of each differential
signal optionally connects to analog ground as shown in Figure 9-7.

+

Channel

1M

Input

_

100

Default settings for all channels are:

CH- grounded (switch on)
CH+ not grounded (switch off)

Figure 9-7. Analog Ground Option Switch

Analog Ground Option Switch

SW1

8

7

6

5

4

3

12

O

N

+

CHA

_

+

CHB

_

+

CHC

_

+

CHD

_

9.3 Field Wiring

SignalPro Series Users Manual 78

Figure 9-8 shows a basic wiri ng diagram for inputs to the QTC-450 filter module. The positive
side of each input signal connects to the B NC center connector, and the negati ve side of the
signal connects to the BNC outer shell.

+

CHA (1)

_

0

+

CHB (2)

_

1

+

CHC (3)

Signal Source

_

2

+

CHD (4)

_

3

QTC-450

Common Analog Ground

Figure 9-8. QTC-450 Wiring Diagram

9.4 Filter Design Program

The QTC-450 filter module is designed around the Burr-Brown® UAF42 universal active

SignalPro Series Users Manual 79

filter. To aid in the design of active filters, Burr-Brown® provides a series of FilterPro™
computer aided design programs. Using the FILTER42 program and the UAF42, it is simple to
design and implement all kinds of active filters. The DOS-compatible program guides the user
through the design process and automatically calculates component values. FILTER42
supports the following all pole filter types: Butterworth, Bessel, Chebyshev, Inverse
Chebyshev and Tuned Circuit. Burr- Brown® Appli cation Bulletin AB- 035C discusses in d epth
the operation and configuration options for the UAF42 and i s i nclud ed w i th the QTC-450 f il ter
module (on the customer CD-ROM) to ensure ease of operation.

9.4.1 Filter Parameter Selection

To configure the desired filter type, initiate the FilterPro™ design program and select the
UAF42 option. The program will prompt the user to enter the following parameters:

(1) the desired response:

- low-pass, high-pass or band-pass

(2) the filter type:

- Butterworth, Chebyshev or Bessel filter for low-pass or high-pass response

- Tuned Circuit for band-pass response

(3) the filter order:

- [n=2] for band-pass

- [n=3] for low-pass & high-pass

(4) the -3 dB cutoff frequency

(5) the reference frequency (where a reference line will be drawn in the frequency
response plot to show the magnitude and the phase angle of the response)

Once these parameters are entered, the user can view the frequency response (magnitude and
phase) plot a nd see the component values computed b y the program in order to determine
which filter values met the above specifications.

9.4.2 Filter Block Configuration

SignalPro Series Users Manual 80

The components of a low-pass, high-pass and band-pass f ilter are presented as two blocks in
Figure 9-9.

LP

Low Pass

RC1:Short
RC2:Open

Band Pass

HP

High Pass

PP1

PP1

PP1

Figure 9-9. Low-pass, Band-pass and High-pass Filter Block Diagram

The FilterPro™ program will determine component values for the following variables: Rp, Cp,
Rq, RF1, C1A RF2, C2A and R2A. Figure 12-10 matches the blocks from the previous diagram
to corresponding locations on the QTC-450 filter blocks. The FilterPro™ component values
should be inserted into the filter block positions of RC1 through RC8 as depicted in Figure
9-10.

HP

Cp
Rp

RC1
RC2
RC3
RC4
RC5
RC6
RC7
RC8

RC1
RC2
RC3
RC4
RC5
RC6
RC7
RC8

Rp
Cp
RQ
RF1

C1A

RF2

C2A
R2A

LP

PP1

Figure 9-10. Corresponding Component Values of LP, HP and PP1

For example, if the component values of LP are Rp=316kW and Cp=0.1lF, then a 316kW
resistor should be i nser te d in the RC1 position of the f ilter bl ock and 0.1 l F ca pacitor should b e
inserted i n RC2 position. A s shown in Fi gure 9- 9, f or a bandpa ss fil ter the RC1 positi on would
be shorted and the RC2 position would be open.

9.4.3 Low Pass Filter Design Examples

-134.06

-134.06

-134.06

-134.06

-134.06

-134.06

Phase

1.004K

502

100.4

50.2

10.07

5.03

-3dB Freq.

RC7

PP1

RC5

RC3

LP

158K

316K

158K

316K

158K

316K

RC1

1kHz

500Hz

100Hz

50Hz

10Hz

5Hz

Filter

SignalPro Series Users Manual 81

Table 9-2 lists the component values for third order Butterworth low-pass filters at various
theoretical cutof f f r eq uencies. The l a st tw o row s show the actual - 3d B cutoff fr e que ncy and the
associated phase angles.

RC2

RC4

RC6

RC8

0.1uF

Table 9-2. Butterworth Low Pass Filter Design Examples

0.1uF

0.01uF

0.01uF

1000PF

1000PF

158K316K1,58M3.16M1.43M2.87M

158K316K1,58M3.16M1.43M2.87M

9.5 QTC-450 Specifications

Connector: DIN-48 male, mates with QTE-7, QTE-14, and QTC-450-PCS

SignalPro Series Users Manual 82

Signal Connection: BNC Connector

Signal Type: Differential

Number of Channels: 4

Voltage Input Range: ±10 VDC, ±1 VDC, ±100 mVDC, ±50 mVDC, ±20 mVDC

Input Bias Current: 20 pA typ, 100 pA max

Input Offset Voltage: ± (0.1+0.5/G) mV typ, ± (0.5+2.5/G) mV max (Adjustable to zero)

Input Offset Drift: ± (2+10/G) lV/°C typ, ± (5+50/G) lV/°C max

Input Impedance: 500 GW

Slew Rate: 12 V/ls min, 17 V/ls typ

Gain Range: 0.5, 5, 50, 100, 250

Gain Error: X0.5 0.002% typ, 0.04% max

X5 0.01% typ, 0.1% max

X50 0.02% typ, 0.2% max

X100 0.04% typ, 0.4% max

X250 0.1% typ, 1% max

Gain Non linearity: X0.5 ± 0.001% of FS typ, ± 0.01% of FS max

X5 ± 0.002% of FS typ, ± 0.01% of FS max

X50 ± 0.004% of FS typ, ± 0.02% of FS max

X100 ± 0.006% of FS typ, ± 0.02% of FS max

X250 ± 0.01% of FS typ, ± 0.04% of FS max

Gain Temp. Coefficient: X0.5 ± 3 ppm/°C typ, ± 20 ppm/°C max

X5 ± 4 ppm/°C typ, ± 20 ppm/°C max

X50 ± 6 ppm/°C typ, ± 40 ppm/°C max

X100 ± 10 ppm/°C typ, ± 60 ppm/°C max

X250 ± 25 ppm/°C typ, ± 100 ppm/°C max

Common Mode Rejection: X0.5 70 dB typ, 90 dB max

X5 87 dB typ, 104 dB max

SignalPro Series Users Manual 83

Active Filter Device: Burr-Brown UAF42

Filter Frequency Range: 0.1 Hz to 50 KHz

Filter Option: Low pass, high pass, band pass (jumper selectable)

Types of Filters: Bessel, Butterworth, Chebyshev, Inverse Chebyshev, Tuned Circuit

Number of Poles: 3 for low-pass and high-pass / 2 for band-pass

Power Requirements: +5V ±5% @80mA

Dimension: 160mm x 100mm

X50 100 dB typ, 110 dB max

X100 100 dB typ, 110 dB max

X250 100 dB typ, 110 dB max

+15V ±5% @70mA

-15V ±5% @70mA

Weight: 0.17 Kg

Temperature Range: 0 - 70° C

Simultaneous Sample Hold -

Acquisition Time: 10V Step to 0.01% 0.75ls typ

10V Step to 0.1% 0.5ls typ

Bandwidth: 1MHz

Aperture Jitter: 50 ps

Hold Settling Time: 250ns to 1mV

Hold Droop Rate: 0.01 lV/ls

Hold Mode Offset: -1mV typ

SSH Accuracy: ±0.002% FS

SSH Nonlinearity: ±0.03% FS Gain Error

10 QTC-500 5B Module Multipurpose Isolated Signal Input

Card

SignalPro Series Users Manual 84

QTC-500 Features

Eight channel Multipurpose Input



Industry Standard 5B series compatible (easy socket and screw connections)



Up to 256 5B modules can be configured in a system




Optional cold junction sensor for thermocouple calibration



Mix and Match 5B Modules: Thermocouple, RTD, Strain, Frequency, mV, V & mA
Terminal block for quick, easy signal connections



The QTC-500 is a multipurpose input card which provides isolated input signals by utilizing
5B modules. Each installed 5B module offers 1500V isolati on both from the system and other
channels. Up to thirty-two QTC-500 cards can be configured i n an Omega signal conditioning
and data acquisition system f or a total of 256 analog input channels. The QTC-500 can also be
coupled with other modules in Omega’s SignalPro series to provide a versatile data
acquisition system.

The QTC-500 module consists of two circuit boards: the QTC-500 interface board and the
QTC-500T terminal board. The interface board is a standard 3U size board which can be
mounted in the QTE-7 or QTE-14 data acquisition enclosures. The QTC-500T terminal board
contains the 5B module input terminal blocks. This two board configuration allows quick and
easy connection of sensor lead wires. After the initial configuration of the interface board, it
can be mounted in a data acquisition enclosure and will rarely require removal. All
connections are completed on the screw terminals of the portable QTC-500T, which is then
plugged into the interface board and secured using two thumb screws. (See Figure 10-1).

QTE-7

QTC-500T

Terminal Block

QTC-500 Interface Board

5B Modules

Figure 10-1. QTC-500 5B Module Multipurpose Isolated Input Card

10.1 Circuit Board Description

10.1.1 QTC-500 Interface Board Description

SignalPro Series Users Manual 85

The QTC-500 interface board shown in Figure 10-1 can be mounted in either the QTE-7 or
QTE-14 data acquisition rack enclosures. Each QTC-500 board will occupy three rack
enclosure slots due to the height of the 5B modules. (See Chapter 2 for information on
SignalPro seri es racks) . Each rack encl osure i s equipped with D IN-48 female connector whi ch
mates to the QTC-500 and other SignalPro series signal conditioners. The rack also contains a
standard Omega D37 connector which attaches to the host computer data acquisition adapter.

10.1.2 QTC-500T/QTC-500TC Terminal Board Description

The QTC-500T terminal board shown in Figure 10-1 contains the 5B module input terminal
blocks and optional current measurement resistor sockets. An optional cold junction
compensation circuit is available for thermocouple calibration on terminal board model
QTC-500TC. The terminal board DIN-48 male connector plugs into the QTC-500 interface
board and is equipped with a strain relief bracket to secure external transducer wiring.

10.2 Hardware Configuration

For system configuration options see Chapter 1: SignalPro Series Overview, section 1.3:
Hardware Configuration.

10.2.1 QTC-500 Interface Board Configuration

Figure 10-2 depicts the location of the main A/D channel and board selection jumper blocks
(J1 and J2) and the eight 5B module sockets. System configuration options for J1 and J2 are
discussed extensively in Chapter 1, section 1.3.

QTC-500

CH0 through CH15

CH0

J1

5B1 5B2 5B3 5B4 5B5 5B6 5B7 5B8

Board

12

J2

Figure 10-2. QTC-500 Jumper Block Locations

10.2.2 QTC-500T / QTC-500TC Terminal Board Configuration

The QTC-500T/500TC terminal board shown in Figure 13-3 shows the location of the 5B

SignalPro Series Users Manual 86

module termi nal blocks, opti onal current measureme nt resistor sockets and the Cold Juncti on
Compensation (CJC) temperature sensor (QTC-500TC only). The terminal board DIN-48 male
connector plugs into the QTC-500 interface board and is equipped with a strain relief bracket
to secure external sensor wiring.

QTC-500T / QTC-500TC

ST1

CH4

CH5

CH6

CH7

E­S­S+
E+

E­S­S+
E+

E­S­S+
E+

E­S­S+
E+

Optional Cold Jun ctio n

Compensation Module

CH0

CH1 CH2

CH3

Optional Current

Measurement Resistor

Socket

E­S­S+
E+

E­S­S+
E+

E­S­S+
E+

E­S­S+
E+

Figure 10-3. QTC-500T /QTC-500TC Terminal Board

The QTC-500TC CJC temperature sensor (AC1361) is only required by thermocouple modules
such as 5B37 and 5B47. Figure 10-3 depicts the location of the optional current measurement
resistor sockets provided for use wi th current modules of 4~20mA or 0~20mA. Ei ght 20 ohm
±0.1% precision resistors are included wi th QTC-500T/QTC-500TC for current measurement
configuration. Insert the resistors into the socket by each terminal block for the specific
channel(s) where current measurement configuration is desired.

10.3 Field Wiring

Each QTC-500 interface b oard can accommodate up to eight di fferent 5B modul es, accepting a
wide variety of transducer signals such as thermocouple, RTD, mV, V, mA, frequency and
strain. The transducer connections to the QTC-500T are made via four positi on screw termi nal
blocks associated with each channel. Figure 10-4 illustrates the field wiring for various 5B
series modules.

AC1361

SignalPro Series Users Manual 87

(QTC-500TC Only )

E­S­S+

Thermocouple

E+

Thermocouple Input Module

E-

RTD

S­S+
E+

3 & 4 Wire

3 & 4-Wire RTD Input Module

E­S-

4~20mA

S+
E+

Current Input Module

1
2
3
4

1
2
3
4

1
2
3
4

20 ohm

0.1%

E-

2 Wire

S­S+
E+

RTD

2-Wire RTD Input Module

E-

­+

S­S+
E+

mV, V

mV, V Voltage Input Module

TTL Input

~

Zero
Crossing
Input

Frequency Input Module

E­S­S+
E+

1
2
3
4

1
2
3
4

1
2
3
4

E­S­S+
E+

Full Bridge Strain G a g e

Figure 10-4. Field Wiring of 5B Series Modules

1
2
3
4

Half Bridg e Strain G a g e

E­S­S+
E+

1
2
3
4

10.4 QTC-500/QTC-500T/QTC-500TC Specifications

Power Requirements:

1500 VDC (Signal inputs to system, channel-to-channel)

Isolation:

Eight 5B module inputs

Number of Channels:

DIN-48 female, mates with screw terminal block for easy connection

Signal Connection:

SignalPro Series Users Manual 88

DIN-48 male, mates with QTC-7 and QTC-14Connector:

CJC Sensor

CJC Accuracy:

Dimension:

Weight:

Model AC1361

± 0.25 °C @ +25°C,

± 0.5 °C Over +5 °C to +45°C

+5V ±5% @15mA + current requirment of 5B modules
+15V±5% @7mA typical

-15V±5% @7mA typical
160mm x 100mm x 71mm for QTC-500

100mm x 100mm x 30mm for QTC-500T/500TC

0.12 Kg excluding 5B modules for QTC-500

0.35 Kg for QTC-500T/500TC
0 ~ +70 °CTemperature Range:

SignalPro Series Users Manual
Version 1.80
January 15, 1999
Part No. 940-0135-180