Measurement Computing USB-1808 Manuale utente

USB-1808

Eight-Channel Simultaneous-Sampling Multifunction Device

User's Guide

May 2019. Rev 3

HM USB-1808.docx

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

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

Other product and company names mentioned 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-1808 ....................................................................................................................6

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

Chapter 2

Installing the USB-1808 ........................................................................................................................7

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

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

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

Calibrating the hardware.....................................................................................................................................7

Updating firmware..............................................................................................................................................7

Chapter 3

Functional Details .................................................................................................................................8

External components ..........................................................................................................................................8

USB connector.................................................................................................................................................................. 8

Screw terminals................................................................................................................................................................. 8

LEDs ................................................................................................................................................................................10

Analog input .....................................................................................................................................................10

Channel-Gain queue ........................................................................................................................................................10

Analog output ...................................................................................................................................................11

Digital I/O.........................................................................................................................................................11

Digital input scanning......................................................................................................................................................11

Pull-up/down configuration .............................................................................................................................................11

Counter input ....................................................................................................................................................12

Totalize counter mode......................................................................................................................................................13

Period measurement mode...............................................................................................................................................13

Pulse width measurement mode.......................................................................................................................................13

Quadrature encoder input .................................................................................................................................13

Timer output .....................................................................................................................................................14

Synchronous I/O – mixing analog, digital, and counter scanning ....................................................................15

Clock I/O ..........................................................................................................................................................15

Digital triggering ..............................................................................................................................................15

Pattern triggering ..............................................................................................................................................15

Mask option .....................................................................................................................................................................15

Ground..............................................................................................................................................................16

Power output.....................................................................................................................................................16

Mechanical drawings........................................................................................................................................17

Chapter 4

Specifications......................................................................................................................................18

Analog input .....................................................................................................................................................18

Accuracy...........................................................................................................................................................19

Analog input DC voltage measurement accuracy ............................................................................................................19

Dynamic performance......................................................................................................................................................19

USB-1808 User's Guide

Noise performance ...........................................................................................................................................................19

Analog output ...................................................................................................................................................20

Analog input/output calibration........................................................................................................................21

Digital input/output...........................................................................................................................................21

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

Quadrature inputs.............................................................................................................................................................22

Timer ................................................................................................................................................................23

External clock input/output...............................................................................................................................23

External trigger .................................................................................................................................................24

Pattern trigger ...................................................................................................................................................24

Memory ............................................................................................................................................................24

Power ................................................................................................................................................................24

USB ..................................................................................................................................................................25

Environmental ..................................................................................................................................................25

Mechanical .......................................................................................................................................................25

Screw terminal connector .................................................................................................................................25

Differential mode pinout..................................................................................................................................................26

Single-ended mode pinout ...............................................................................................................................................27

EU Declaration of Conformity............................................................................................................28

Preface

About this User's Guide

What you will learn from this user's guide

This user's guide describes the Measurement Computing USB-1808 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 is used for the names of objects on a screen, such as buttons, text boxes, and checkboxes.

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 USB-1808 hardware is available on our website at www.mccdaq.com. You can

also contact Measurement Computing Corporation with specific questions.

Knowledgebase: kb.mccdaq.com

Tech support form: www.mccdaq.com/support/support_form.aspx

Email: techsupport@mccdaq.com

Phone: 508-946-5100 and follow the instructions for reaching Tech Support

For international customers, contact your local distributor. Refer to the International Distributors section on our

web site at www.mccdaq.com/International.

Chapter 1

Introducing the USB-1808

The USB-1808 is a multifunction data acquisition device providing the following features:

Eight 18-bit simultaneous-sampling differential (DIFF) or single-ended (SE) analog input channels –

software-selectable per channel as DIFF or SE

Sample rate of 50 kS/s per channel maximum

Analog input ranges of ±10 V, ±5 V, 0 V to 10 V, and 0 V to 5 V – software-selectable per channel

Two 16-bit analog outputs

Four individually-configurable digital I/O channels

Two high-speed general-purpose counters

Two quadrature encoder inputs

Two timer outputs

One external digital trigger for data acquisition and one external digital trigger for data generation

Two external clock inputs and two clock outputs for synchronous input and output operations with more

than one device.

Screw terminals for field wiring connections

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

The USB-1808 is a USB 2.0 high-speed device that is fully compatible with both USB 1.1, USB 2.0, and

USB 3.0 ports.

Functional block diagram

USB-1808 functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

Chapter 2

Installing the USB-1808

Unpacking

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

electricity. Before removing the 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.

Installing the software

Refer to the MCC DAQ Quick Start and the USB-1808 product page on our website for information about the

software supported by the USB-1808.

Install the software before you install your device

The driver needed to run the USB-1808 is installed with the software. Therefore, you need to install the

software package you plan to use before you install the hardware.

Installing the hardware

To connect the USB-1808 to your system, 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 connected for the first time, a Found New Hardware dialog opens when the operating system detects the

device. When the dialog closes, the installation is complete. The Status LED on the USB-1808 turns on after

the device is successfully installed.

If the Status LED turns off

If communication is lost between the device and the computer, the device LED turns off. To restore

communication, disconnect the USB cable from the computer and then reconnect it. This should restore

communication, and the LED should turn on.

Calibrating the hardware

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

the device to Measurement Computing Corporation when calibration is required. The recommended calibration

interval is one year.

Updating firmware

Your DAQ device contains firmware that can be updated in the field if required. Firmware is available for

download at www.mccdaq.com/firmware.aspx. MCC recommends that you check this page periodically to see

if an update to your device firmware is available.

Chapter 3

Functional Details

External components

The USB-1808 has the following external components (see Figure 2 through Figure 4 on pgs. 9-10):

USB connector

LEDs

Screw terminals

USB connector

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

Screw terminals

The screw terminals provide the following connections:

Eight DIFF analog inputs (CH0H/CH0L to CH7H/CH7L) or eight SE analog inputs (CH0Hto CH7H)

Refer to Figure 2 and Figure 3 on page 9 for DIFF and SE pinouts.

Two analog outputs (AOUT0and AOUT1)

Four digital I/O lines (DIO0 to DIO3)

Two general-purpose counter inputs (CTR0and CTR1)

Two quadrature encoder inputs (ENC0A, ENC0B, ENC0Z and ENC1A, ENC1B, ENC1Z)

Two timer outputs (TMR0 and TMR1)

An external trigger input (ITRIG)and an external trigger output OTRIG)

Two external clock inputs (ICLKI and OCLKI) and two external clock outputs (ICLKO, OCLKO)

One +5 V power output (+VO) connection

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

Use 16 AWG to 30 AWG wire when making connections to the screw terminals.

USB-1808 User's Guide Functional Details

Figure 2. DIFF mode pinout

Figure 3. SE mode pinout

USB-1808 User's Guide Functional Details

LEDs

The USB-1808 has two LED indicators that indicate the status of power and data. The LEDs are stacked one

above the other, as shown in Figure 4.

The Status LED turns on when the device is detected by the computer.

The Activity LED blinks when data is transferred and is off otherwise.

USB connector

Activity LED

Status LED

Figure 4. LED indicators

Analog input

You can configure each analog input channel for either SE or DIFF mode. MCC recommends connecting

unused analog input terminals to analog ground terminals during operation. For example, if you are not using

CH7L, connect this terminal to an available AGND terminal.

The input voltage range is software-selectable per channel for ±10 V, ±5 V, 0 V to 10 V, or 0 V to 5 V.

Analog input operations can be paced by the internal clock or by an external clock (ICLKI – refer to Clock I/O

on page 15). They can be initiated by a digital trigger (Digital triggering on page 15) or a pattern trigger

(Pattern triggering on page 15).

Refer to Synchronous I/O – mixing analog, digital, and counter scanning on page 15 for information on running

analog input scans at the same time as other subsystem scans.

For more information about analog signal connections

For more information about analog input connections, refer to the Guide to DAQ Signal Connections (available

for download at www.mccdaq.com/support/DAQ-Signal-Connections.aspx).

Channel-Gain queue

The channel-gain queue feature allows you to configure a different gain setting for each channel. The gain

settings are stored in a channel-gain queue list that is written to local memory on the device.

The channel-gain queue list can contain up to eight unique elements. The channel list must be in increasing

order. An example of a five-element list is shown in the following table.

Sample channel-gain queue list

Element Channel Range

CH0H/CH0L (DIFF)

±10 V

CH2H/AGND (SE)

±5 V

CH3H/AGND (SE)

0 V to 5 V

CH6H/CH6L (DIFF)

0 V to 10 V

CH7H/CH7L (DIFF)

±5 V

Indice

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