Measurement Computing USB-1608G-OEM Manual de usuario

USB-1608G-OEM

High-speed Multifunction DAQ

Document Revision 2

January 2015

User's Guide

HM USB-1608G-OEM

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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-1608G-OEM........................................................................................................6

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

Chapter 2

Installing the USB-1608G-OEM............................................................................................................7

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

Downloading the software..................................................................................................................................7

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

Installing on a Windows platform..................................................................................................................................... 7

Installing on an Android platform..................................................................................................................................... 7

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

Factory calibration............................................................................................................................................................ 8

Field calibration................................................................................................................................................................ 8

Firmware updates ...............................................................................................................................................8

Chapter 3

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

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

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

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

Burst mode..........................................................................................................................................................9

Board components............................................................................................................................................10

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

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

Header connectors............................................................................................................................................................10

Signal connections............................................................................................................................................12

Analog input....................................................................................................................................................................12

External clock I/O............................................................................................................................................................13

Digital I/O........................................................................................................................................................................14

Trigger input....................................................................................................................................................................14

Counter input...................................................................................................................................................................15

Timer output....................................................................................................................................................................15

Power output....................................................................................................................................................................15

Ground.............................................................................................................................................................................15

Mechanical drawings........................................................................................................................................16

Chapter 4

Specifications......................................................................................................................................17

Analog input.....................................................................................................................................................17

Accuracy...........................................................................................................................................................18

Analog input DC voltage measurement accuracy............................................................................................................18

Noise performance...........................................................................................................................................................18

Settling time.....................................................................................................................................................................18

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

Digital input/output...........................................................................................................................................19

External trigger.................................................................................................................................................19

External clock input/output...............................................................................................................................20

USB-1608G-OEM User's Guide

Counter.............................................................................................................................................................20

Timer ................................................................................................................................................................21

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

Power................................................................................................................................................................21

USB ..................................................................................................................................................................21

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

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

Header connector..............................................................................................................................................22

Pin orientation..................................................................................................................................................................22

Differential mode pinout..................................................................................................................................................23

Single-ended mode pinout ...............................................................................................................................................24

Preface

About this User's Guide

What you will learn from this user's guide

This user's guide describes the Measurement Computing USB-1608G-OEM 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.

Where to find more information

Additional information about USB-1608G-OEM 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.

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

website at www.mccdaq.com/International.

Chapter 1

Introducing the USB-1608G-OEM

The USB-1608G-OEM is a USB 2.0 high-speed device provides the following features:

16 single-ended (SE) or eight differential (DIFF) analog input channels

Eight individually configurable digital I/O channels

Two counter channels (32-bit) that count TTL pulses

One timer output channel (32-bit)

Header connectors for field wiring connections

The USB-1608G-OEM device 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-1608G-OEM is powered by the +5 volt USB supply from your computer, and requires no external

power.

Caution! There are no product safety, electromagnetic compatibility (EMC), or CE marking compliance

claims made for the USB-1608G-OEM. The USB-1608G-OEM is intended for use as a

component of a larger system. MCC can help developers meet their compliance requirements. The

end product supplier, however, is responsible for conforming to any and all compliance

requirements.

Functional block diagram

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

Figure 1. Functional block diagram

Chapter 2

Installing the USB-1608G-OEM

Unpacking

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

electricity. Before removing the board 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.

Downloading the software

Refer to the USB-1608G-OEM product page on the Measurement Computing website for information about the

supported software you can download.

Install the software before you install the hardware

The driver needed to run the 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.

Installing the hardware

Installing on a Windows platform

Install the software before you install your device

A driver needed to run the USB-1608G-OEM is installed when you install the software. Therefore, you need to

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

For operation on a Windows operating system, we recommend that you run Windows Update to update your

operating system with the latest USB drivers.

To connect the USB-1608G-OEM 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 Status LED is on, the device is powered and ready

for operation. When the Status LED is off, the device is not powered or did not initialize. Figure 3 on page 10

shows the location of the Status LED.

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

USB-1608G-OEM hardware, or you may lose data and/or your ability to communicate with the

device.

If the Status LED is off

If the Status LED is on but then turns off, the computer has lost communication with the USB-1608G-OEM.

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

restore communication, and the LED should turn on.

Installing on an Android platform

Many Android devices include a standard A-type USB port to connect to the USB-1608G-OEM. If your device

does not have a USB port, you may need a USB OTG cable in order for your Android device to host a USB

device. Refer to your Android device documentation for more information.

USB-1608G-OEM User's Guide Installing the USB-1608G-OEM

Calibrating the hardware

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

The USB-1608G-OEM supports field calibration. Calibrate the device using InstaCal whenever the ambient

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

Firmware updates

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.We recommend that you check this page periodically to see if an

update to your device firmware is available.

Chapter 3

Functional Details

Analog input modes

The USB-1608G-OEM can acquire analog input data in two basic modes – software paced and hardware paced.

Software paced

You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion with a

software command. The analog value is converted to digital data and returned to the computer. Repeat this

procedure until you have the total number of samples that you want.

The sample rate in software paced mode is system-dependent and can range from 33 S/s to 4000 S/s.

Hardware paced

You can acquire data from up to 16 channels in hardware paced mode. The analog data is continuously

acquired, converted to digital values, and written into the FIFO buffer on the device until you stop the scan. The

FIFO buffer is serviced in blocks as the data is transferred from the FIFO buffer to the computer memory

buffer. You start a hardware-paced scan with either a software command or with an external hardware trigger

event.

The maximum sampling rate in hardware paced mode from one to 16 channels is 250 kS/s aggregate.

Burst mode

When using the onboard pacer, you can enable burst mode for more precise timing between samples. When

burst mode is enabled, each successive channel in a scan is sampled at the maximum A/D rate. This ensures that

samples from each channel are taken as close as possible to the same absolute point in time. When burst mode

is disabled, data is sampled at evenly spaced intervals, allowing maximum settling time and best amplitude

accuracy. Multi-channel scanning with burst mode enabled and disabled is shown in Figure 2.

Figure 2. Multi-channel scan with burst mode enabled and disabled

The burst mode sample period is 4 µs.

You can trigger the acquisition with the external trigger, and control the clock period with the internal or

external A/D pacer clock. Pacing from the external clock always operates with burst mode enabled.

USB-1608G-OEM User's Guide Functional Details

Board components

Board components are shown in Figure 3. Note that each screw terminal location is unpopulated.

1 Screw terminal (unpopulated) 5 Pull-up/down jumper W1

2 Header connector W4 6 Status LED (top) and Activity LED (bottom)

3 Header connector W6 7 USB connector

4 Screw terminal (unpopulated)

Figure 3. Board components

USB connector

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

LEDs

The device has two LEDs – Status and Activity.

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

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

Header connectors

The header connectors provide the following connections:

16 SE (CH0 to CH15) or eight DIFF (CH0H/CH0L to CH7H/CH7L) analog input connections

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

One external clock input (AICKI) and one external clock output (AICKO) for analog inputs

One digital trigger input (TRIG)

Two counter inputs (CTR0, CTR1)

One timer output (TMR)

One power output (+5V)

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

The differential mode pinout is shown on page 11. The single-ended mode pinout is shown on page 12.

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