Measurement USB-2627 User Manual
USB-2408 Series
USB-2408
USB-2408-2AO
Document Revision 3
June 2014
© Copyright 2014
User's Guide
24-Bit Multifunction Temperature and Voltage Devices
HM USB-2408-Series.docx
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2
Table of Contents
Preface
About this User's Guide ....................................................................................................................... 5
What you will learn from this user's guide ......................................................................................................... 5
Conventions in this user's guide ......................................................................................................................... 5
Where to find more information ......................................................................................................................... 5
Chapter 1
Introducing the USB-2408 Series ........................................................................................................ 6
Overview: USB-2408 Series features ................................................................................................................. 6
USB-2408 Series block diagram ........................................................................................................................ 7
Chapter 2
Installing a USB-2408 Series Device ................................................................................................... 8
What comes with your shipment? ....................................................................................................................... 8
Hardware .......................................................................................................................................................................... 8
Documentation ................................ ................................................................ ................................................................ .. 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Calibrating .......................................................................................................................................................... 9
Factory calibration ............................................................................................................................................................ 9
Field calibration ................................................................................................................................................................ 9
Chapter 3
Functional Details ............................................................................................................................... 10
External components ........................................................................................................................................ 10
USB connector .................................................................................................................................................................10
LEDs ................................................................................................................................................................................10
Screw terminals................................................................................................................................................................10
Signal connections ............................................................................................................................................ 12
Input isolation ..................................................................................................................................................................12
Analog/TC input ..............................................................................................................................................................12
Analog input mode ...........................................................................................................................................................13
Gain queue .......................................................................................................................................................................13
TC input mode .................................................................................................................................................................14
Analog output (USB-2408-2AO only) .............................................................................................................................16
Digital I/O ........................................................................................................................................................................16
Internal pull-up/pull-down capability...............................................................................................................................17
External pull-up/pull-down capability .............................................................................................................................19
Counter input ...................................................................................................................................................................19
Ground ................................................................................................................................................................ .............19
Mechanical drawings ................................................................................................................................ ........ 20
Chapter 4
Specifications ...................................................................................................................................... 21
Analog input ..................................................................................................................................................... 21
Channel configurations ..................................................................................................................................... 22
Compatible sensors ..........................................................................................................................................................22
Accuracy ........................................................................................................................................................... 22
Thermocouple measurement accuracy ............................................................................................................................. 22
Analog input DC voltage measurement accuracy ............................................................................................................23
Input bandwidth ...............................................................................................................................................................24
Noise performance ...........................................................................................................................................................24
Channel switching error ...................................................................................................................................................25
Throughput rate ................................................................................................................................................ 25
3
USB-2408 Series User's Guide
Analog voltage output (USB-2408-2AO only) ................................................................................................. 26
Analog input/output calibration ........................................................................................................................ 27
Digital input/output........................................................................................................................................... 28
Counter ............................................................................................................................................................. 29
Memory ............................................................................................................................................................ 29
Microcontroller ................................................................................................................................................. 29
Power ................................................................................................................................................................ 30
USB specifications ........................................................................................................................................... 30
Environmental .................................................................................................................................................. 30
Mechanical ....................................................................................................................................................... 30
Screw terminal connector type and pinout ....................................................................................................... 30
Screw terminal pinout ......................................................................................................................................................31
Declaration of Conformity .................................................................................................................. 33
4
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing USB-2408 Series data acquisition devices and lists
device specifications.
Conventions in this user's guide
For more information about …
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Preface
Where to find more information
Additional information about USB-2408 Series hardware is available on our website at www.mccdaq.com. You
can also contact Measurement Computing Corporation by phone, fax, or email with specific questions.
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
5
Chapter 1
Introducing the USB-2408 Series
Overview: USB-2408 Series features
The USB-2408, USB-2408-2AO includes the following devices:
USB-2408
USB-2408-2AO
These devices are USB 2.0 full-speed devices that are supported under the following operating systems:
Microsoft Windows® 8/7/Vista®/XP (32-bit or 64-bit)
Macintosh (32-bit or 64-bit)
Linux (32-bit or 64-bit)
Each USB-2408 Series device provides the following features:
16 single-ended (SE) or eight differential (DIFF) 24-bit analog inputs with sampling rates up to 1 kS/s.
Each channel is software-configurable as SE or DIFF. For each DIFF channel pair, you lose one SE
channel.
Analog input ranges of ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.312 V, ±0.156 V, and ±0.078 V.
Up to eight analog inputs can be configured as DIFF thermocouple (TC) inputs, which include built-in
cold-junction compensation and open TC detection.
Computer protection provided through a minimum of 500 VDC input isolation between field wiring and the
USB interface.
Eight lines of digital I/O and two 32-bit counters.
Screw terminals for field wiring connections
The USB-2408-2AO also provides two 16-bit analog output channels. You can pace a single channel at rates of
up to 1 kS/s. You can pace both channels simultaneously at rates of up to 500 S/s.
6
USB-2408 Series User's Guide Introducing the USB-2408 Series
USB-2408 Series block diagram
USB-2408 Series functions are illustrated in the block diagram shown here.
Figure 1. USB-2408 Series functional block diagram
7
Chapter 2
Installing a USB-2408 Series Device
What comes with your shipment?
As you unpack your USB-2408 Series device, verify that the following components are included.
Hardware
USB-2408 Series device (USB-2408 or USB-2408-2AO)
USB cable (2-meter length)
Documentation
MCC DAQ Quick Start Guide
The Quick Start Guide booklet provides an overview of the MCC DAQ software you received with the device,
and includes information about installing the software. Please read this booklet completely before installing any
software or hardware.
Unpacking
As with any electronic device, take care while handling to avoid damage from static electricity. Before
removing the USB-2408 Series device from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored static charge.
If the device is damaged, notify Measurement Computing Corporation immediately by phone, fax, or e-mail.
Knowledgebase: kb.mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
For international customers, contact your local distributor. Refer to the International Distributors section on our
website at www.mccdaq.com/International.
Installing the software
Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD. This booklet is
available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.
Installing the hardware
Install the software before you install your device
A driver needed to run the USB-2408 Series device is installed when you install the software. Therefore, you
need to install the software package you plan to use before you install the hardware.
To connect a USB-2408 Series device to your system, turn on your computer and connect the USB cable to an
available USB port on the computer or to an external USB hub connected to the computer. Connect the other
end of the USB cable to the USB connector on the device. No external power is required.
When you connect the device for the first time to a computer running Windows, a Found New Hardware dialog
opens when the operating system detects the device. The dialog closes after the device is installed.
A green Status LED indicates the device status. When the LED is on, the device is powered and ready for
operation. If the LED is not on, the device is not powered or did not initialize.
Figure 2 on page 10 shows the location of the STATUS LED.
8
USB-2408 Series User's Guide Installing a USB-2408 Series Device
Caution! Do not disconnect any device from the USB bus while the computer is communicating with the
USB-2408 Series device, or you may lose data and/or your ability to communicate with the
device.
If the Status LED turns off
If the Status LED turns on but then turns off, the computer has lost communication with the USB-2408 Series
device. To restore communication, disconnect the USB cable from the computer and then reconnect it. This
should restore communication, and the Status LED should turn on.
Calibrating
Factory calibration
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Contact
Measurement Computing for details about how to return your device and have it calibrated to the factory
specifications.
Field calibration
USB-2408 Series hardware supports field calibration. You should calibrate the device with InstaCal whenever
the ambient temperature changes by more than ±10 °C from the last calibration.
9
1
Screw terminal pins 23 to 44
4
USB Connector
2
Status LED
5
Screw terminal pins 1 to 22
3
Activity LED
Functional Details
External components
USB-2408 Series devices have the following external components:
USB connector
LEDs
Screw terminals
Figure 2 shows the location of each component.
Chapter 3
Figure 2. USB-2408 Series components
USB connector
The USB connector provides 5 V power and communication. No external power supply is required.
LEDs
USB-2408 Series devices have two LEDs – STATUS and ACTIVITY.
The Status LED is lit when the device is detected and installed on the computer.
The Activity LED indicates the communication status of a device. This LED blinks when data is
transferred, and is off when the device is not communicating.
Screw terminals
USB-2408 Series devices have two banks of screw terminals. Screw terminal functions for DIFF and SE modes
are identified in Figure 4 and Figure 3.
The USB-2408 Series device screw terminals provide the following connections:
16 SE (CH0 to CH15 – see Figure 3) or eight DIFF (CH0H/CH0L to CH7H/CH7L) analog input connections
Eight digital I/O connections (DI00 to DI07)
Two analog output connections (AOUT0, AOUT1) – USB-2408-2AO only
Two counter inputs (CTR0, CTR1)
One power output (+5V)
10 analog grounds (AGND), four digital grounds (DGND), and one chassis ground (CHAS)
10
USB-2408 Series User's Guide Functional Details
Figure 3. SE mode pinout
* These pins are labeled NC (no connection) on the USB-2408.
Figure 4. DIFF mode pinout
* These pins are labeled NC (no connection) on the USB-2408.
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