Measurement Computing USB-2416-4AO Manuale utente

USB-2416-4AO

USB-based 24-bit, Isolated, High-Channel-Count Multifunction DAQ Device with 4 Analog Outputs

Document Revision 5A

May 2013

User's Guide

HM USB-2416-4AO

Trademark and Copyright Information

Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo are

either trademarks or registered trademarks of MeasurementComputing Corporation. Refer to the Copyrights &

Trademarks section on mccdaq.com/legal for more information about Measurement Computing trademarks.

Other product and company namesmentioned herein are trademarks or trade names of their respective

companies.

reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic,mechanical, by

photocopying, recording, or otherwise without the prior written permission of Measurement Computing

Corporation.

Notice

Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for

use in life support systems and/or devices without prior written consent from Measurement Computing

Corporation. Life support devices/systems are devices or systems that, a) are intended for surgical implantation

into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result in

injury. Measurement Computing Corporation products are not designed with the components required, and are

not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of

people.

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-2416-4AO ...........................................................................................................6

Overview: USB-2416-4AO features...................................................................................................................6

Functional block diagram...................................................................................................................................6

Chapter 2

Installing the USB-2416-4AO................................................................................................................7

What comes with your USB-2416-4AO shipment?............................................................................................7

Hardware .......................................................................................................................................................................... 7

Software............................................................................................................................................................................ 7

Documentation.................................................................................................................................................................. 7

Optional components........................................................................................................................................................ 7

Unpacking...........................................................................................................................................................7

Installing the software ........................................................................................................................................8

Installing the hardware .......................................................................................................................................8

Connecting to an AI-EXP32 with the DSUB37 expansion connector................................................................8

Configuring the hardware...................................................................................................................................9

Connecting the board for I/O operations ............................................................................................................9

Connectors, cables – main I/O connector.......................................................................................................................... 9

Screw terminal pin out – differential ...............................................................................................................................10

Screw terminal pin out – single-ended.............................................................................................................................11

Chapter 3

Functional Details ...............................................................................................................................12

USB-2416-4AO components............................................................................................................................12

LEDs................................................................................................................................................................................13

USB connector.................................................................................................................................................................13

External power connector................................................................................................................................................13

Screw terminal wiring ......................................................................................................................................13

Analog/TC input terminals ...............................................................................................................................13

Analog input mode...........................................................................................................................................................14

Thermocouple inputs .......................................................................................................................................................14

Noise filtering, data rate, and throughput rate..................................................................................................................15

Multiple-channel throughput rates...................................................................................................................................16

Input isolation...................................................................................................................................................16

Analog output terminals (VDAC0 through VDAC3).......................................................................................17

Digital I/O.........................................................................................................................................................17

Internal pull-up/pull-down capability...............................................................................................................................18

External pull-up/pull-down capability .............................................................................................................................19

Counter input terminals (CTR0, CTR1)...........................................................................................................19

USB-2416-4AO mechanical drawings .............................................................................................................20

Chapter 4

Calibrating the USB-2416-4AO...........................................................................................................21

Calibration methods..........................................................................................................................................21

USB-2416-4AO User's Guide

Factory calibration...........................................................................................................................................................21

Self calibration.................................................................................................................................................................21

Chapter 5

Specifications......................................................................................................................................22

Analog input .....................................................................................................................................................22

Channel configurations.....................................................................................................................................23

Compatible sensors..........................................................................................................................................................23

Accuracy...........................................................................................................................................................23

Thermocouple measurement accuracy.............................................................................................................................23

Analog input DC voltage measurement accuracy............................................................................................................32

Input bandwidth...............................................................................................................................................................34

Noise performance...........................................................................................................................................................34

Channel switching error...................................................................................................................................................35

Throughput rate ................................................................................................................................................36

Analog voltage output ......................................................................................................................................37

Analog input/output calibration........................................................................................................................38

Digital input/output...........................................................................................................................................38

Counter.............................................................................................................................................................39

Memory ............................................................................................................................................................39

Microcontroller.................................................................................................................................................39

Power................................................................................................................................................................40

USB specifications ...........................................................................................................................................40

Environmental ..................................................................................................................................................40

Mechanical .......................................................................................................................................................41

Screw terminal connector type and pin-out ......................................................................................................41

Screw terminal pin out.....................................................................................................................................................42

Optional AI-EXP32 expansion module............................................................................................................44

AI-EXP32 screw terminal pin out....................................................................................................................................46

USB-2416-4AO screw terminal pin out (with AI-EXP32 attached)................................................................................48

Declaration of Conformity..................................................................................................................49

Preface

About this User's Guide

What you will learn from this user's guide

This user's guide explains how to install, configure, and use the USB-2416-4AO so that you get the most out of

its analog I/O, thermocouple (TC) input, digital I/O, and counter/timer I/O features.

Conventions in this user's guide

For more information

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.

Where to find more information

Additional information about the USB-2416-4AO is available on our website at www.mccdaq.com. You can

also contact Measurement Computing Corporation by phone, fax, or email with specific questions.

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

Chapter 1

Introducing the USB-2416-4AO

Overview: USB-2416-4AO features

is a multifunction measurement and control board designed for the USB bus.

The USB-2416-4AO is a full-speed (up to1 kS/s), multiplexed 24-bit measurement system that provides up to

16 differential and up to 32 single-ended (SE) analog inputs. It offers software-selectable analog input ranges of

±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.312 V, ±0.156 V, and ±0.078 V.

It also protects your computer by providing a minimum of 500 VDC input isolation between field wiring and

the USB interface.

You can configure up to 16 of the analog inputs as differential thermocouple (TC) inputs. In thermocouple

mode, the USB-2416-4AO includes built-in cold-junction compensation and open thermocouple detection.

You can add up to 32 single-ended or up to 16 differential channels by connecting the USB-2416-4AO to an

AI-EXP32 expansion module. Each channel is software-configurable as single-ended or differential. For each

channel pair configured differentially, you lose one SE channel.

The USB-2416-4AO has four 16-bit analog output channels with an update rate of up to1 kS/s and an output

range of ±10 V.

The device has eight lines of digital I/O and two 32-bit counters. You can expand up to 24 DIO channels by

connecting the USB-2416-4AO to an AI-EXP32 expansion module.

Six banks of removable screw-terminal blocks provide connectivity to the analog input channels, digital I/O

lines, counter/timer channels, and analog outputs.

Functional block diagram

USB-2416-4AO functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

Chapter 2

Installing the USB-2416-4AO

What comes with your USB-2416-4AO shipment?

As you unpack your USB-2416-4AO, verify that the following components are included.

Hardware

 USB-2416-4AO

 USB cable (2-meter length)

 PS-5V2AEPS - 10 Watt regulated power supply plugs into the external power connector of the

USB-2416-4AO.

Software

 MCC DAQ CD

Documentation

In addition to this hardware user's guide, you should also receive the Quick Start Guide. This 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.

Optional components

Expansion devices that are compatible with the USB-2416-4AO must be ordered separately. If you ordered the

following product with your device, it should be included with your shipment.

AI-EXP32

Analog input expansion module adds up to 16 differential or 32 single-ended inputs to the USB-2416-4AO.

ACC-202 Din-rail kit

Accessory for mounting a USB-2416-4AO to a standard DIN rail. Use the thread-forming screws to attach the

DIN rail clip to your device.

Unpacking

As with any electronic device, you should take care while handling to avoid damage from static

electricity. Before removing the USB-2416-4AO 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 any components are missing or 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.

Thread-forming

screws

USB-2416-4AO User's Guide Installing the USB-2416-4AO

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

To connect the USB-2416-4AO to your system, turn your computer on, and then do the following:

1. Connect the PS-5V2AEPS power supply to the USB-2416-4AO's external power connector, and plug the

other end into a power outlet.

2. Connect the USB cable to the USB-2416-4AO USB connector and to a USB port on your computer. A

USB2.0 port is recommended.

When you connect the USB-2416-4AO to a computer for the first time, a Found New Hardware dialog opens

when the operating system detects the device. When the message closes, the installation is complete.

The power LED (bottom LED) blinks during device detection and initialization, and then remains solid if

properly detected. If not, check if the USB-2416-4AO has sufficient power. When the device is first powered

on, there is usually a momentary delay before the power LED begins to blink, or come on solid.

Caution! Do not disconnect any device from the USB bus while the computer is communicating with the

USB-2416-4AO, or you may lose data and/or your ability to communicate with the

USB-2416-4AO.

Connecting to an AI-EXP32 with the DSUB37 expansion connector

Use the 37-pin expansion connector to connect the USB-2416-4AO to an AI-EXP32 expansion module.

To connect the two devices directly to each other, follow these steps.

1. Disconnect the USB cable from the USB-2416-4AO.

2. Remove the external power cable from the USB-2416-4AO.

3. Connect the two devices together by inserting the AI-EXP32 DSUB37 connector into the DSUB37

connector on the USB-2416-4AO.

Figure 2. USB-2416-4AO directly connected to an AI-EXP32

4. Turn the connected modules over and secure the connection by screwing the connection plate to both

modules, as shown below.

Figure 3. USB-2416-4AO secured to an AI-EXP32

5. Connect the external power supply to the power input port of the USB-2416-4AO, and then plug it into an

AC outlet.

6. Connect the USB cable from the USB-2416-4AO to the host computer USB port.

USB-2416-4AO User's Guide Installing the USB-2416-4AO

Connect to a USB 2.0 high speed hub to achieve the highest transfer rate (480 Mbps). When connected to a

USB 1.1 full-speed port, the transfer rate is limited to 12 Mbps.

Configuring the hardware

Except for the DIO pull-up selection, all hardware configuration options on the USB-2416-4AO are software

controlled. You can select some of the configuration options using InstaCal, such as the analog input

configuration (single-ended or differential channels). When measuring from thermocouples, make sure you

configure the channels for differential mode.

Caution! Turn off power to all devices connected to the system before making connections. Electrical shock

or damage to equipment can result even under low-voltage conditions.

Information on signal connections

General information regarding signal connection and configuration is available in the Guide to Signal

Connections. This document is available on our web site at www.mccdaq.com/signals/signals.pdf.

Caution! Always handle components carefully, and never touch connector terminals or circuit components

unless you are following ESD guidelines in an appropriate ESD-controlled area. These guidelines

include using properly-grounded mats and wrist straps, ESD bags and cartons, and related

procedures.

Avoid touching board surfaces and onboard components. Only handle boards by their edges. Make

sure the USB-2416-4AO does not come into contact with foreign elements such as oils, water, and

industrial particulate.

The discharge of static electricity can damage some electronic components. Semiconductor

devices are especially susceptible to ESD damage.

Connecting the board for I/O operations

Connectors, cables – main I/O connector

The following table lists the board connectors and compatible accessory products for the USB-2416-4AO.

Main connector specifications

Main connectors Six banks of detachable screw terminals

Compatible accessory product for the 37-pin expansion

connector AI-EXP32 expansion board with screw terminals (connects

directly to the USB-2416-4AO)

USB-2416-4AO User's Guide Installing the USB-2416-4AO

Screw terminal pin out – differential

Figure 4. 16-channel differential mode pin out

Differential connection guidelines

 When connecting differential voltage inputs to a "floating" voltage source, make sure there is a DC return

path from each voltage input to ground. You make this path by connecting a resistor from each input to a

GND pin (pins 18, 36, 39, 42, 44, 46, 66, 81, 84). A value of approximately 100 kΩ can be used for most

applications.

Leave unused input channels either floating or tied to GND (pins 18, 36, 39, 42, 44, 46, 66, 81, 84).

Source impedances should be kept as small as possible to avoid settling time and accuracy errors.

 When configuring thermocouple sensors, keep any stray capacitance as small as possible relative to GND

(pins 18, 36, 39, 42, 44, 46, 66, 81, 84) to avoid settling time and accuracy errors. For thermocouple

channels, do not provide a return path to ground. This is done internally.

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