Omega OM-DAQ-USB-2401 User Manual

OM-DAQ-USB-2401

Multiple Channel USB Data

Acquisition Module

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User’s Guide

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U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford, CT 06907-0047 USA

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FAX: [phone] e-mail: [e-mail]

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Customer Service: 1-800-622-2378/1-800-622-BEST

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Engineering Service: 1-800-872-9436/1-800-USA-WHEN

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FAX: [phone] e-mail: [e-mail]

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FAX: [phone] e-mail: [e-mail]

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D-75392 Deckenpfronn, Germany
Toll-Free: 0800 6397678 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

United Kingdom: OMEGA Engineering Ltd.

ISO 9001 Certified One Omega Drive, River Bend Technology Centre, Northbank

Irlam, Manchester M44 5BD United Kingdom
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

OMEGAnet®Online Service Internet e-mail

omega.com [e-mail]

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA 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, human applications.

®

i

OM-DAQ-USB-2400

Multiple Channel USB Data Acquisition Module

TABLE OF

CONTENTS

Page

Section 1 - Introduction ....................................................................... 1-1

1.1 Precautions ................................................................................................ 1-1

1.2 Safety Warnings and IEC Symbols ......................................................... 1-2

1.3 Statement on CE Marking ........................................................................ 1-2

1.4 General Description and System Components .................................... 1-2

Section 2 - Hardware .......................................................................... 2-1

2.1 Package Inspection ................................................................................... 2-1

2.2 Included Items .......................................................................................... 2-1

Section 3 - Hardware Setup ................................................................. 3-1

3.1 OM-DAQ-USB-2400 Components ......................................................... 3-1

3.2 USB Hubs and Power Adaptors ............................................................. 3-1

3.2.1 USB-powered Hubs .................................................................... 3-2

3.2.2 Self-powered Hubs ..................................................................... 3-2

3.2.3 Power Adaptors .......................................................................... 3-2

3.3 Connecting Your OM-DAQ-USB-2401 Acquistition Systems To PC ... 3-3

3.4 Connecting Various Hardware Setups .................................................. 3-4

3.4.1 Direct Connection To Computer USB Port(s) ......................... 3-4

3.4.2 Connection To USB-powered Hub ........................................... 3-5

3.4.3 Connections To Self-powered and USB-powered Hubs ........ 3-5

3.5 OM-DAQ-USB-2401 Mounting .............................................................. 3-6

3.5.1 OM-DAQ-USB-2401 Wall Mounting ........................................ 3-7

3.5.2 OM-DAQ-USB-2401 DIN Rail Mounting ................................ 3-8

Section 4 - Software ............................................................................ 4-1

4.1 Getting Started .......................................................................................... 4-1

4.2 Software Installation ................................................................................ 4-1

4.2.1 System Requirements ................................................................. 4-1

4.2.2 Software Setup ............................................................................. 4-2

4.3 DAQ Central Software Operation .......................................................... 4-4

4.3.1 Main Control Window Pull-Down Operations ...................... 4-6

4.3.2 Device Configuration ................................................................. 4-8

4.4 Power Line Rejection .............................................................................. 4-14

4.5 Optical Isolation ....................................................................................... 4-14

4.6 A/D Conversion ..................................................................................... 4-14

4.7 Input Ranges .................................................................................................... 4-15

4.8 Analog Input Configuration .................................................................. 4-15

4.9 Measurement Duration, Scan Time, and Resolution ......................... 4-16

4.10 Automatic Calibration ...........................................................................4-17

4.11 Thermocouple Measurements ............................................................ 4-18

Section 5 - Signal Management ............................................................ 5-1

5.1 Channel Control and Expansion ............................................................ 5-1

5.2 Scan Time and Resolution ....................................................................... 5-1

5.2.1 Scan Time ..................................................................................... 5-1

5.2.2 Resolution [Effective Number of Bits (ENOB, RMS)] .............5-1

5.3 Under Sampling and Aliasing ................................................................ 5-2

ii

OM-DAQ-USB-2400
Multiple Channel USB Data Acquisition Module

TABLE OF

CONTENTS

Page

5.4 Triggering ................................................................................................... 5-4

5.5 Signal Modes ............................................................................................. 5-4

5.6 System Noise ............................................................................................. 5-6

5.7 Averaging ................................................................................................... 5-6

5.8 Analog Filtering ........................................................................................ 5-6

5.9 Input and Source Impedance .................................................................. 5-7

5.10 Crosstalk .................................................................................................. 5-7

8.1 Service and Calibration ............................................................................ 7-1

Section 6 - CE Conformity ..................................................................... 6-1

6.1 OM-DAQ-USB-2401 Design for CE Conformity .................................. 6-1

Section 7 - Troubleshooting .................................................................. 7-1

7.1 Basic Checklist ........................................................................................... 7-1

7.2 Symptoms and Solutions ......................................................................... 7-1

Section 8 - Service and Calibration ....................................................... 8-1

8.1 Service and Calibration ............................................................................ 8-1

Section 9 - Specifications ..................................................................... 9-1

Section 10 - Approvals and Regulatory Compliance ........................... 10-1

10.1 International Usage and CE Marking ................................................ 10-1

iii

List of Figures

Section Figure Description .............................................................. Page

Section 1 1-1 IEC Symbols ............................................................... 1-2

1-2 System Components ................................................. 1-3

Section 3 3-1 OM-DAQ-USB-2401 Hardware and Dimensions ... 3-1

3-2 Connection of an OM-DAQ-USB-2401 System

to a Computer USB Port ........................................... 3-3

3-3 Direct Connection to Computer USB Port ............. 3-4

3-4 Connection to USB-powered Hub .......................... 3-5

3-5 Connection to Self-powered Hub

and to USB-powered Hub ........................................ 3-6

3-6 OM-DAQ-USB-2401 Wall Mounting ...................... 3-7

3-7 OM-DAQ-USB-2401 Wall Mounting

Dimensions ................................................................ 3-7

3-8 OM-DAQ-USB-2401 Rail Mounting ....................... 3-8

Section 4 4-1 Welcome Screen ......................................................... 4-2

4-2 Select Install Screen ................................................... 4-2

4-3 Confirm Installation Screen ..................................... 4-3

4-4 Main Control Window ............................................. 4-4

Table 4-1 Toolbar Buttons ......................................................... 4-5

4-5 File Menu .................................................................... 4-6

4-6 Device Menu .............................................................. 4-6

4-7 Tools Menu ................................................................. 4-7

4-8 Help Menu ................................................................. 4-7

4-9 Configuration Mode Channels Tab Screen ............ 4-8

4-10 Scan Options .............................................................. 4-9

4-11 Unit Options .............................................................. 4-9

4-12 Automatic Calibration .............................................. 4-9

4-13 Trigger Options ....................................................... 4-10

4-14 "Start Trigger" Options ............................................ 4-10

4-15 "Stop Trigger" Options ........................................... 4-10

4-16 Data Tab .................................................................... 4-11

4-17 Data "Save Behavior" Option ................................. 4-11

4-18 Main Window Screen ............................................. 4-12

4-19 Gauges Screen .......................................................... 4-12

4-20 Bars Screen ............................................................... 4-12

4-21 Digital Screen ........................................................... 4-12

4-22 Table Screen .............................................................. 4-12

4-23 Waveform Screen .................................................... 4-13

4-24 Sample Options Screen ........................................... 4-13

OM-DAQ-USB-2400

Multiple Channel USB Data Acquisition Module

LIST OF

FIGURES

iv

List of Figures

Section Figure Description ............................................................. Page

4-25 OM-DAQ-USB-2400 Block Diagram .................... 4-14

4-26 OM-DAQ-USB-2401 Single-ended and Differential

Conections to Analog Input Channels Diagram ... 4-16

4-27 Calibration/Scan Arrangement ............................ 4-17

4-28 Thermocouple Wiring ............................................ 4-18

Section 5 Table 5-1 Scan Rate vs Resolution (ENOB, RMS) .................. 5-2

5-1 Examples of Under Sampling ................................. 5-3

5-2 Trigger Source Diagram ........................................... 5-4

5-3 Noise Reduction in Differential Mode ................... 5-5

5-4 Example of Floating Differential Circuit .................5-5

5-5 Analog to Digital Converter .................................... 5-7

Section 6 6-1 OM-DAQ-USB-2401 With Ferrite Cores Installed .. 6-1

6-2 Ferrite Core ................................................................ 6-2

Section 9 Table 9-1 Thermocouple Accuracy (C) for

OM-DAQ-USB-2400 .................................................. 9-1

OM-DAQ-USB-2400
Multiple Channel USB Data Acquisition Module

LIST OF

FIGURES

Section 1 - Introduction

Please read this manual completely before installing and operating your Omega
data acquisition system. It’s important to read and follow all notes, cautions,
warnings and safety precautions before operating this device. “Device” refers to
your data acquisition unit.

1.1 Precautions

• This device is not designed for use in any medical or nuclear applications.

• Do not operate this device in flammable or explosive environments.

• Never operate with a power source other than the one recommended in this
manual or listed on product labels.

• This device has been designed for dry, moisture free indoor applications only.

• Do not operate this device outside of the recommended use outlined in this
manual.

• Never use your data acquisition unit as a portable device. Your unit has been
designed to be operated in a permanent installation only.

There are no user serviceable parts inside your device.
Attempting to repair or service your unit may void your
warranty.

The discharge of static electricity can damage some electronic
components. Semiconductor devices are especially susceptible
to ESD damage. You should always handle components
carefully, and you should never touch connector pins or
circuit components unless you are following ESD guidelines in
an appropriate ESD controlled area. Such guidelines include
the use of properly grounded mats and wrist straps, ESD
bags and cartons, and related procedures.

Never remove a USB cable from an active OM-DAQ-USB­2401 unit while an acquisition is in progress. An active unit is
any unit that is currently open and has channels configured
for scanned input. Such disconnection may require you to exit
and then re-launch Omega DAQ Central, after the USB cable
has been connected.

1-1

Introduction

1

NOTE:

NOTE:

NOTE:

When using OM-DAQ-USB-2401 unit to acquire data,
computer energy save modes can cause false data readings.
Prior to using the unit, ensure your computer’s energy save
mode is disabled. If needed, consult your PC user’s manual to
disable energy save (power suspension) modes.

1.2 Safety Warnings and IEC Symbols

This device is marked with international safety and hazard symbols in
accordance with IEC standards. It is important to read and follow all precautions
and instructions in this manual before operating or commissioning this device as
it contains important information relating to safety and EMC. Failure to follow
all safety precautions may result in injury and or damage to your device. Use of
this device in a manner not specified will void your warranty.

IEC symbols Description

Caution, refer to accompanying documentation

EU’s Waste Electrical and Electronic Equipment
Compliance

Figure 1-1. IEC Symbols

1.3 Statement on CE Marking

It is the policy of OMEGA®to comply with all worldwide safety and EMI/EMC
regulations that apply. OMEGA is constantly pursuing certification of its
products to the European New Approach Directives. OMEGA will add the CE
mark to every appropriate device upon certification. For additional information
see Section 10 - Approvals & Regulatory Compliance.

1.4 General Description & System Components

The OM-DAQ-USB-2401 is a USB 2.0 full speed thermocouple/voltage input
data acquisition module (fully compatible with both USB 1.1 and USB 2.0 ports).
This stand-alone module draws power from the USB port to operate. An external
(optional) power supply can be used. All configurable options (including
individual channel input type and range) are software programmable.

The OM-DAQ-USB-2401 has user programmable voltage inputs that range from
±30 mV to ±10V, full scale. The compact, modular packaging ensures ease of use
in a variety of applications. Units can be DIN rail or wall mounted with the
included hardware or easily operated on a bench. All analog input channels can
be measured sequentially at about 1 ms per channel. A total of 1000 samples per
second can be taken, divided across all active channels.*

Introduction

1

1-2

NOTE:

*At highest scan rate, 1000 samples/sec +/- 1% with one
channel on, +/- 5% with all channels on.

The main items you will be using in your data acquisition system are the
OM-DAQ-USB-2401 unit, its USB cable, and power adaptor.

Figure 1-2. System Components

Introduction

1

1-3

NOTE:

USB

POWER

ADAPTER

(OPTIONAL)

OM-DAQ-USB-2401

MODULE

PC WITH USB CONNECTION (NOT INCLUDED)

Section 2 - Hardware

It is important that you read this manual completely and follow all safety
precautions before operating this instrument.

2.1 Package Inspection

Remove the packing list and verify that you have received all your equipment. If
you have any questions about the shipment, please call our Customer Service
Department at 1-800-622-2378 or 203-359-1660. We can also be reached on the
Internet at omega.com, e-mail: [e-mail]. When you receive the
shipment, inspect the container and equipment for any signs of damage. Note
any evidence of rough handling in transit. Immediately report any damage to
the shipping agent.

The carrier will not honor any damage claims unless all
shipping material is saved for inspection. After examining
and removing contents, save packing material and carton in
the event reshipment is necessary.

2.2 Included Items

The following items are supplied in the box:

• 1 Omega OM-DAQ-USB-2401 data acquisition module

• 1 Omega DAQ Central software CD

• 1 USB Cable

• 1 9Vdc Power Adaptor

• 1 Mounting Kit (8 screws, 2 mounting brackets, 2 DIN rail adaptors)

• 1 Omega screwdriver

• 1 OM-DAQ-USB-2400 Series User Manual (this one, M-5025)

• 1 OM-DAQ-USB-2400 Series Quickstart Manual (MQS-5025)

• 2 Type K Thermocouples with Stripped Leads

2-1

Hardware

2

NOTE:

Section 3 - Hardware Setup

3.1 OM-DAQ-USB-2401 System Components

Figure 3-1. OM-DAQ-USB-2401 Hardware and Dimensions

The external power port is used in applications which have
USB hubs that are not self-powered. See the next section for
more information.

The 'STATUS LED' blinking at Scan Rate means an acquisition
is in progress. At a fast scan rate, the 'STATUS LED' appears
solid. The 'POWER LED' in solid means the unit has power

3.2 USB Hubs and Power Adaptors

With the use of USB hubs you can connect up to 10 DAQ units to one PC. USB
hubs can be of the self-powered type, or of the USB-powered type. Both types of
hubs are available from a variety of vendors.

3-1

Hardware Setup

3

CHANNEL 1 & 2

ANALOG INPUT

A
1
H

A
1
L

A
2
H

A
2
L

C
O
M

C
O
M

C
O
M

E
X
C

12 V OUT

CHANNEL 3 & 4

ANALOG INPUT

A
3
H

A
3
L

A
4
H

A
4
L

C
O
M

C
O
M

C
O
M

E
X
C

12 V OUT

CHANNEL 5 & 6

ANALOG INPUT

A

5

H

A

5

L

A

6

H

A

6

L

C

O

M

C

O

M

C

O

M

E

X

C

12 V OUT

CHANNEL 7 & 8

ANALOG INPUT

A

7

H

A

7

L

A

8

H

A

8

L

C

O

M

C

O

M

C

O

M

E

X

C

12 V OUT

!

!

OM-DAQ-USB-2400 SERIES

USB DATA ACQUISITION SYSTEM

9V

1.0 A

- +

USB

EXT
PWR

STATUS

PWR
IND

127 (5.00)

97

(3.80)

107

(4.20)

POWER SUPPLY

POWER LED

STATUS LED

USB PORT

DIMENSIONS mm (in)

38

(1.5)

NOTE:

NOTE:

3.2.1 USB-powered Hubs

These hubs draw all power from the host USB connector’s power pins. The
power is used for hub internal functions and for the hub’s ports. Each port of a
USB-powered hub must be capable of supplying at least 100 mA.

3.2.2 Self-powered Hubs

These hubs draw power from a source other than the host USB connector, with
exception that they may draw up to 100 mA from their upstream connection for
hub internal functions. The external power is used for hub internal functions and
for the hub’s ports. Each port of a self-powered hub must be capable of
supplying 500 mA.

3.2.3 Power Adaptors

Power adaptors, also referred to as auxiliary power packs, are required for some
self-powered hubs, and for DAQ modules that are powered from USB-powered
hubs. In addition, DAQ units will require the use of a power adaptor when used
with certain laptops.

When using a power adaptor with your DAQ system, be sure
to supply power (from the adaptor to the DAQ unit) before
connecting the USB cable. This allows the DAQ to inform the
host computer (upon connection of the USB cable) that the
unit requires minimal power from the computer.

Power adaptors for use with the DAQ have a current limit of 500 mA (min.) and
a voltage range of +7.5 to +12 Volts DC. These specifications are provided on the
end-face of the DAQ unit.

If the computer does not recognize the DAQ unit, make sure the computer’s USB
port is properly enabled and is in good working order. If the computer still fails
to recognize the DAQ unit, the use of an external 9v DC power adaptor may be
required.

The use of certain notebook computers may require the use

of a power adaptor with your DAQ unit.

Hardware Setup

3

3-2

NOTE:

NOTE:

3.3 Connecting Your OM-DAQ-USB-2401 Acquisition System to PC

When using a power adaptor with your DAQ system, be sure
to supply power (from the adaptor to the DAQ) before
connecting the USB cable. This allows your DAQ to inform
the host computer (upon connection of the USB cable) that the
unit requires minimal power from the computer.

Use an approved high-speed USB cable to connect the DAQ system to one of the
host computer’s USB ports. There is no need for an additional power source in
this setup since the power pins (of the PC’s USB connection) supply 500 mA at 4
to 5.25 V. Additional setup examples are described in this chapter, some of which
involve USB hubs and/or power adaptors.

Figure 3-2. Connection of an OM-DAQ-USB-2401 System to a Computer USB Port

Certain notebook computers require the use of a power
adaptor with your DAQ unit.

Hardware Setup

3

3-3

NOTE:

NOTE:

USB

POWER
ADAPTER
(OPTIONAL)

3.4 Connecting Various Hardware Setups

ON-DAQ-USB-2401 data acquisition systems range from simple to complex. One
example of a simple system is that of one OM-DAQ-USB-2401 connected to a
PC’s USB connector. A much more complex system is one that contains 10 OM­DAQ-USB-2401 units and a combination of USB-powered and self-powered
hubs. Despite the wide range of possibilities in between, use of the following
examples should enable you to properly connect your system.

In the examples that follow, the USB hubs have four external
ports (downstream ports). The USB hubs used in your system
may have more. Connections can be adjusted accordingly.

3.4.1 Direct Connection to Computer USB Port(s)

In this example, one DAQ unit is connected by cable to one of the computer’s
USB ports. The number of USB connectors may vary from PC to PC. When you
connect DAQ units directly to a USB connector in this manner, no additional
power source is required since the computer’s USB connector power pins supply
the DAQ with adequate power (500 mA at 4.75 to 5.25 V).

Figure 3-3. Direct Connection to a Computer USB Port(s)

Hardware Setup

3

3-4

USB

POWER
ADAPTER
(OPTIONAL)

NOTE:

3.4.2 Connection to USB-powered Hub

In this example, two OM-DAQ-USB-2401s are connected by cable to individual
ports of a single USB-powered hub. Since the hub receives all its power from the
computer’s USB, the hub cannot supply adequate power to the DAQ units.
Because of this aspect of insufficient power, each unit is connected to its own
power adaptor.

Figure 3-4. Connection to USB-Powered Hub

The power adaptors used must be capable of supplying at
least 500 mA and have a voltage rating of +7.5 to +12 Vdc.

3.4.3 Connections to Self-Powered and USB-powered Hubs

This example illustrates a system that makes use of four DAQ units and two
different style USB hubs. Two DAQs are connected by cable to individual ports
of a self-powered USB hub. In addition, the self-powered hub is connected to a
downstream USB-powered hub, which is also connected to two DAQ units.

Notice that the DAQ units connected to the self-powered hub have no adaptors
connected to them. This is because the hub receives external power (in addition
to the PC supplied USB power), which is capable of supporting the downstream
devices connected directly to it. In comparison, the three OM-DAQ-USB-2401s
connected to the USB-powered hub each require their own power adaptor. As in
example 3.4.2, the power adaptors used must be capable of supplying at least
500 mA and have a voltage rating of +7.5 to +12 Vdc.

Hardware Setup

3

3-5

USB

USB

HUB

POWER

ADAPTER

POWER

ADAPTER

NOTE:

Figure 3-5. Connections to Self-Powered Hub and to USB-Powered Hub

USB port locations vary from PC to PC.

3.5 OM-DAQ-USB-2401 Mounting

The OM-DAQ-USB-2401 mounting kit contains the following accessories:

• 2 mounting brackets (to be used for either wall or DIN rail)

• 4 long screws (to be used for either wall or DIN rail)

• 4 short screws (to be used for the DIN rail)

• 2 DIN rail plastic adaptors

Hardware Setup

3

3-6

USB

USB
HUB

USB
HUB

POWER

ADAPTER

POWER

ADAPTER

POWER

ADAPTER

NOTE:

3.5.1 OM-DAQ-USB-2401 Wall Mounting

In order to mount the OM-DAQ-USB-2401 to the wall, you will need to:

1. Remove the rear screws from the OM-DAQ-USB-2401.

2. Align the mounting brackets with the rear holes on the DAQ unit (make sure

that the ears are facing outwards, like in the figure below).

3. Use the longer screws to reconnect the mounting brackets to the body of the

enclosure, in the same direction as the screws that were removed from the
DAQ unit.

4. Drill 2 holes for #4 screws, 5.50" apart. Tip: Hold the DAQ unit with mounting

brackets attached, up against the wall; use the holes as a guide to mark where
you will drill holes in the wall.

5. Install the two screws into the wall.

6. Mount the DAQ unit on the wall by passing the screw head through the larger

mounting bracket holes and then sliding it down.

Figure 3-6. OM-DAQ-USB-2401 Wall Mounting

Figure 3-7. OM-DAQ-USB-2401 Wall Mounting Dimensions

Hardware Setup

3

3-7

133 (5.50)

MOUNTING HOLE DISTANCE

146 (6.00)

Ø6

2 PLACES

(0.25)

107

(4.20)

Ø3

2 PLACES

(0.125)

CHANNEL 1 & 2

ANALOG INPUT

A
1
H

A
1
L

A
2

H

A
2
L

C
O
M

C
O
M

C
O
M

E
X
C

12 V OUT

CHANNEL 3 & 4

ANALOG INPUT

A
3
H

A
3
L

A
4
H

A
4
L

C
O
M

C
O
M

C
O
M

E
X
C

12 V OUT

CHANNEL 5 & 6

ANALOG INPUT

A

5

H

A

5

L

A

6

H

A

6

L

C

O

M

C

O

M

C

O

M

E

X

C

12 V OUT

CHANNEL 7 & 8

ANALOG INPUT

A

7

H

A

7

L

A

8

H

A

8

L

C

O

M

C

O

M

C

O

M

E

X

C

12 V OUT

!

!

OM-DAQ-USB-2400 SERIES

USB DATA ACQUISITION SYSTEM