Measurement Computing USB-1608FS Manuel utilisateur

USB-1608FS

Analog Input and Digital I/O

Document Revision 7A

January 2014

User's Guide

HM USB-1608FS

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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-1608FS................................................................................................................6

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

Chapter 2

Installing the USB-1608FS....................................................................................................................7

What comes with your USB-1608FS shipment? ................................................................................................7

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

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

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

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

Installing the software ........................................................................................................................................7

Installing the hardware .......................................................................................................................................7

Calibrating the hardware.....................................................................................................................................8

Chapter 3

Functional Details .................................................................................................................................9

Analog input acquisition modes .........................................................................................................................9

Software paced.................................................................................................................................................................. 9

Hardware paced ................................................................................................................................................................ 9

BURSTIO......................................................................................................................................................................... 9

External components ........................................................................................................................................10

USB connector.................................................................................................................................................................10

LED .................................................................................................................................................................................10

Screw terminals................................................................................................................................................................10

Signal connections............................................................................................................................................11

Analog input....................................................................................................................................................................11

Channel-Gain queue ........................................................................................................................................................12

Digital I/O........................................................................................................................................................................12

Pull-up/down configuration .............................................................................................................................................12

Counter input...................................................................................................................................................................13

Trigger input....................................................................................................................................................................13

SYNC I/O ........................................................................................................................................................................13

Calibration output............................................................................................................................................................13

Ground.............................................................................................................................................................................14

Power output....................................................................................................................................................................14

Accuracy...........................................................................................................................................................14

Synchronized operations...................................................................................................................................17

Mechanical drawings........................................................................................................................................18

Chapter 4

Specifications......................................................................................................................................19

Analog input.....................................................................................................................................................19

Digital I/O.........................................................................................................................................................20

External trigger.................................................................................................................................................21

External clock input/output...............................................................................................................................21

Counter.............................................................................................................................................................22

Memory ............................................................................................................................................................22

USB-1608FS User's Guide

Microcontroller.................................................................................................................................................22

Power................................................................................................................................................................23

General .............................................................................................................................................................23

Environmental ..................................................................................................................................................23

Mechanical .......................................................................................................................................................23

Screw terminal connector and pinout ...............................................................................................................23

Declaration of Conformity..................................................................................................................25

Preface

About this User's Guide

What you will learn from this user's guide

This user's guide describes the Measurement Computing USB-1608FS data acquisition device and lists device

specifications.

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

For additional information relevant to the operation of your hardware, refer to the Documents subdirectory

where you installed the MCC DAQ software (C:\Program Files\Measurement Computing\DAQ by default), or

search for your device on our website at www.mccdaq.com.

Chapter 1

Introducing the USB-1608FS

The USB-1608FS is an analog input and digital I/O data acquisition device providing the following features:

Eight 16-bit single-ended (SE) analog input channels

Each input channel has a dedicated A/D converter for simultaneous sampling.

Software-selectable analog input ranges of ±10 V, ±5 V, ±2 V, and ±1 V

Eight individually configurable digital I/O channels

One 32-bit event counter

One external digital trigger input

Bidirectional external clock for synchronous operations with a second device.

Screw terminals for field wiring connections

The device is powered by the +5V USB supply from the computer, and requires no external power.

The USB-1608FS is a full-speed device that is compatible with both USB 1.1 and USB 2.0 ports. The speed of

the device may be limited when using a USB 1.1 port due to the difference in transfer rates on the USB 1.1

versions of the protocol (low-speed and full-speed).

Functional block diagram

USB-1608FS functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

Chapter 2

Installing the USB-1608FS

What comes with your USB-1608FS shipment?

The following items are shipped with the USB-1608FS.

Hardware

USB-1608FS

USB cable

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.

Unpacking

As with any electronic device, take care while handling to avoid damage from static electricity. Before

removing the USB-1608FS from its packaging, ground yourself using a wrist strap or touch either 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 email.

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

web site 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

Be sure you are using the latest system software

Before installing the device, run Windows Update to update your operating system with the latest HID and USB

drivers.

To connect the USB-1608FS to your system, connect the USB cable to a USB port on your computer or to an

external USB hub that is connected to your computer.

The USB-1608FS installs as a composite device with separate devices attached. When you connect the device

for the first time, a Found New Hardware dialog opens as each device interface is detected. This is normal.

After the device is installed its LED will blink and then remain on. This indicates that communication is

established between the USB-1608FS and your computer.

USB-1608FS User's Guide

If the LED turns off

If communication is lost between the device and the computer, the device LED turns off. Disconnect the USB

cable from the computer and then reconnect it. This should restore communication, and the LED should turn on.

Calibrating the hardware

You can calibrate the USB-1608FS with InstaCal. Perform calibration whenever the ambient temperature

changes by more than ±10 °C from the last calibration.

The Measurement Computing Manufacturing Test department performs the initial factory calibration. Contact

Measurement Computing if you want to have the factory calibration coefficients restored.

Chapter 3

Functional Details

Analog input acquisition modes

The USB-1608FS can acquire analog input data in three modes – software paced, hardware paced, and

BURSTIO.

Software paced

The USB-1608FS acquires data one analog sample at a time using software-paced mode. You initiate the A/D

conversion by calling a software command. The analog value is converted to digital and returned to the

computer. You can repeat this procedure until you have the total number of samples that you want.

The USB-1608FS can attain throughput rates up to 500 S/s using a software loop. This rate is system-

dependent.

Hardware paced

The USB-1608FS can acquire data from up to eight channels simultaneously in hardware-paced mode. The

analog data is acquired, converted to digital values, and written to an onboard FIFO buffer on the USB-1608FS

until you stop the scan. Data is transferred from the USB-1608FS FIFO buffer to the memory buffer on your

computer.

The A/D converter is paced by either an internal or external clock source.

The maximum sample rate is an aggregate rate. The total sample rate for all channels is 100 kS/s divided by the

number of channels, with a maximum rate of 50 kS/s for any channel. Using this equation, the USB-1608FS can

acquire data from one channel at 50 kS/s, two channels at 50 kS/s each, four channels at 25 kS/s each, and so

on, up to eight channels at 12.5 kS/s each. You start a hardware-paced scan with a software command.

Optionally, hardware-paced scans can be delayed by an external hardware trigger event.

BURSTIO

When using BURSTIO, the USB-1608FS can acquire data at higher rates using the full capacity of the

32 kilosample FIFO. The acquired data is then read from the FIFO and transferred to a user buffer in the

computer after the acquisition is complete. You can initiate a single acquisition sequence of one, two, four, or

eight channels with a software command. Optionally, BURSTIO scans can be delayed by an external hardware

trigger event.

When BURSTIO is enabled, the number of samples acquired in a scan is limited to the depth of the onboard

memory. The maximum sample rate in BURSTIO mode is an aggregate rate is 200 kS/s. The maximum sample

rate for all channels is 200 kS/s divided by the number of channels, with a maximum rate of 50 kS/s for any

channel.

The maximum sample rate that you can acquire data using BURSTIO is 50 kS/s each for one, two, or four

channels, and 25 kS/s each for eight channels.

USB-1608FS User's Guide

External components

The external components – screw terminal banks, LED, and USB connector –are shown in Figure 2.

1 Screw terminal pins 21 to 40 3 Screw terminal pins 1 to 20

2 LED 4 USB connector

Figure 2. USB-1608FS components

USB connector

The USB connector provides +5 V power and communication. No external power supply is required.

LED

The LED indicates the communication status; it cannot be disabled. LED states are listed in the table below.

LED behavior

LED state Indication

On – steady green The device is connected to a computer or external USB hub.

Blinks once A USB command is received.

Blinks continuously Data is being transferred.

Blinks three times Initial communication is established between the USB-1608FS and the computer.

Blinks at a slow rate The analog input is configured for external trigger. The LED stops blinking and illuminates

steady green when the trigger is received.

Screw terminals

The screw terminals provide the following connections:

Eight analog inputs (CH0 IN to CH7 IN)

Eight digital I/O lines(DIO0 to DIO7)

One external event counter input (CTR)

One SYNC I/O terminal for external clocking and multi-unit synchronization (SYNC)

One external trigger input (TRIG_IN)

One calibration output (CAL)

One power output (PC +5 V)

analog ground (AGND) and digital ground (GND) connections

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Table des matières

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