Measurement Computing USB-2020 Manuale utente

USB-2020

12-bit, Ultra High-Speed USB Device

User's Guide

Document Revision 2

February 2015

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HM USB-2020

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-2020....................................................................................................................6

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

Chapter 2

Installing the USB-2020 ........................................................................................................................7

What comes with your USB-2020 shipment? ..................................................................................................... 7

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

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

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

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

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

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

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

Connecting the external power supply .............................................................................................................................. 8

Calibrating the hardware..................................................................................................................................... 9

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

Connectors, cables, and accessory products ...................................................................................................................... 9

Cabling ............................................................................................................................................................. 10

Field wiring, signal termination and conditioning ...........................................................................................................10

Chapter 3

Functional Details ...............................................................................................................................11

Analog input acquisition modes ....................................................................................................................... 11

Software paced .................................................................................................................................................................11

Continuous scan (hardware paced) ..................................................................................................................................11

BURSTIO ........................................................................................................................................................................11

Connectors and LEDs ....................................................................................................................................... 12

BNC connectors ...............................................................................................................................................................12

Status LEDs .....................................................................................................................................................................12

USB connector .................................................................................................................................................................12

External power connector ................................................................................................................................................12

40-pin auxiliary connector (J9) ........................................................................................................................................13

Signal connections ............................................................................................................................................ 14

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

External clock I/O ............................................................................................................................................................15

Digital I/O ........................................................................................................................................................................15

Trigger input ....................................................................................................................................................................16

Mechanical drawing ......................................................................................................................................... 17

Chapter 4

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

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

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

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

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

Digital input/output........................................................................................................................................... 20

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

USB-2020 User's Guide

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

Memory ............................................................................................................................................................ 21

Power ................................................................................................................................................................ 22

Environmental .................................................................................................................................................. 22

Mechanical ....................................................................................................................................................... 22

USB .................................................................................................................................................................. 22

Signal I/O connectors ....................................................................................................................................... 23

BNC connectors ...............................................................................................................................................................23

Auxiliary connector .........................................................................................................................................................23

Preface

About this User's Guide

What you will learn from this user's guide

This user's guide describes the Measurement Computing USB-2020 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

Additional information about the USB-2020 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-2020

The USB-2020 is a high-speed data acquisition USB board supported under the Windows® operating system.

The USB-2020 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).

The USB-2020 device provides the following features:

two 20 MS/s analog inputs

osimultaneous sampling

o1 A/D per channel

o12-bit resolution

o±10 V, ±5 V, ±2 V, ±1 V voltage ranges (software-selectable)

o17 MHz input bandwidth

64 megasample onboard memory

o40 MS/s overall rate to onboard memory when acquiring from both channels (20 MS/s per channel)

o8 MS/s throughput to host computer

Analog and digital triggering (level and edge )

Analog and digital gating

Eight digital I/O lines

Internal or external pacing of analog scans

Eight digital I/O lines

BNC connectors and 40-pin auxiliary connector for signal connections

Functional block diagram

USB-2020 functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

Chapter 2

Installing the USB-2020

What comes with your USB-2020 shipment?

Hardware

USB-2020

USB cable (2-meter length)

External power supply and cord: 9 VDC, 3 A power adapter. MCC part number CB-PWR-9

Four nylon standoffs

Software

MCC DAQ Software CD

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.

Optional components

Cables

oStandard BNC cable

oC40FF-x

oC40-37F-x

Screw termination boards

oCIO-MINI40

oCIO-MINI37

oSCB-37

Unpacking

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

electricity. Before removing the USB-2020 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 your USB-2020 arrives already 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

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.

USB-2020 User's Guide Installing the USB-2020

Installing the hardware

Before you connect the USB-2020 to your computer, connect the external power supply that was shipped with

the device.

Disconnect USB, then power supply

When disconnecting the USB-2020, disconnect the USB cable first, and then disconnect the power supply.

Connecting the external power supply

Refer to Figure 8 on page 12 for the location of the connectors and LEDs mentioned in the following procedure.

Power to the USB-2020 is provided with the 9 VDC external power supply (CB-PWR-9). Connect the external

power supply before connecting the USB cable to the USB-2020 and your computer.

Complete the following steps to connect the power supply to the USB-2020:

1. Connect the external power cord to the USB-2020-power connector.

2. Plug the power supply into a power outlet.

The top (Device Ready) LED is on (blue) when 9 VDC power is supplied the USB-2020 and a USB connection

is established. If the voltage supply is less than 7.3 V and/or a USB connection is not established, the Device

Ready LED is off.

To connect the USB-2020 to your system, complete the following steps:

3. Connect the USB cable that was shipped with the device to the USB connector on the USB-2020.

The USB cable supplied with the USB-2020 has a higher gauge wire (24 AWG minimum VBUS/GND,

28 AWG minimum D+/D–) than generic USB cables, and is required for proper enumeration of the

USB-2020.

4. Connect the other end of the USB cable to a USB port on your computer or to an external USB hub that is

connected to your computer. The bottom (USB Activity) LED turns on. The USB cable only provides

communication to the USB-2020.

If you are running Windows XP and connect the device to a USB 1.1 port, a balloon displays the message Your

USB device can perform faster if you connect to a USB 2.0 port. You can ignore this message. The

USB-2020 functions properly when connected to a USB 1.1 port, although USB bandwidth is limited.

If the Device Ready LED turns off

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

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

Ready LED should turn on.

If your system does not detect the USB-2020

If a USB device not recognized message appears when you connect the USB-2020, complete the following

steps:

1. Unplug the USB cable from the USB-2020.

2. Unplug the external power cord from the power connector.

3. Plug the external power cord back into the power connector.

4. Plug the USB cable back into the USB-2020.

Your system should now properly detect the USB-2020 hardware. Contact technical support if your system still

does not detect the USB-2020.

USB-2020 User's Guide Installing the USB-2020

Removing USB-2020 boards from Windows XP systems

Device Manager may require up to 30 seconds to detect the removal of a USB-2020 board from a Windows XP

system with Service Pack 2 installed. This time increases with each additional connected device. If you remove

four devices from your system, the time required for Device Manager to update may be almost two minutes.

If you re-attach the USB-2020 to your system before Device Manager updates, the bottom LED does not turn

on. Your system does not detect new hardware until Device Manager first detects that hardware has been

removed. The InstaCal software is unresponsive during this re-detection time. Wait until Device Manager

updates with the new hardware before running InstaCal. The USB-2020 is detected by the system when the top

(Device Ready) LED is on.

Calibrating the hardware

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

calibration coefficients are stored in non-volatile RAM.

You can use InstaCal to recalibrate the USB-2020. No external equipment or user adjustments are required.

At run time, the calibration factors are loaded into system memory and are automatically retrieved each time a

different ADC range is specified. A full calibration typically takes less than two minutes.

Before you calibrate the device, turn your computer on and allow at least 30 minutes for the surrounding

temperature to stabilize. For best results, calibrate the device immediately before making critical measurements.

The high resolution analog components on the board are sensitive to temperature. Pre-measurement calibration

insures that your device is operating with optimum calibration values.

Connecting the board for I/O operations

Connectors, cables, and accessory products

The following table lists the board connectors, applicable cables, and compatible accessory products for the

USB-2020.

Board connectors, cables, and compatible hardware

Parameter Specification

Connector types



Four standard BNC female connectors for analog input,

clock I/O, and digital trigger input

40-pin IDC connector

Compatible cable for the BNC connectors

Standard BNC cable

Compatible cables

C40FF-x: 40-conductor ribbon cable, female both ends, x = length

in feet.

C40-37F-x: 40-pin IDC to 37-pin female D connector, x = length in

feet.

Compatible accessory products

(using the C40FF-x cable)

CIO-MINI40

Compatible accessory products

(using the C40-37F-x cable)

CIO-MINI37

SCB-37

USB-2020 User's Guide Installing the USB-2020

Cabling

For signal connections and termination, you can use the CIO-MINI40 screw terminal board and C40FF-x cable.

Figure 2. C40FF-xcable

For connections to 37-pin connectors or boards, you can use the C40-37F-x or C40F-37M-x cable.

Figure 3. C40-37F-xcable

Field wiring, signal termination and conditioning

You can use the 40-pin CIO-MINI40 universal screw terminal board to terminate field signals and route them

into the USB-2020 using the C40FF-x cable:

You can use the following MCC screw terminal boards to terminate field signals and route them into the

USB-2020 using the C40-37F-x cable directly:

CIO-MINI37 – 37-pin universal screw terminal board.

SCB-37 – 37-conductor, shielded signal connection/screw terminal box.

The red stripe

identifies pin # 1

40-pin Female

IDC Connector

40-pin Female

IDC Connector

The red stripe

identifies pin # 1

37-pin Female

Dsub Connector

40-pin Female

IDC Connector

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