Measurement Computing USB-1408FS User Manual
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Measurement Computing USB-1408FS User Manual

Usb-based analog and digital i/o module
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Summary of Contents for Measurement Computing USB-1408FS

  • Page 2 USB-1408FS USB-based Analog and Digital I/O Module User's Guide Document Revision 5, March, 2008 © Copyright 2008, Measurement Computing Corporation...
  • Page 3 Measurement Computing. Thank you for choosing a Measurement Computing product—and congratulations! You own the finest, and you can now enjoy the protection of the most comprehensive warranties and unmatched phone tech support. It’s the embodiment of our mission: ...
  • Page 4 Information furnished by Measurement Computing Corporation is believed to be accurate and reliable. However, no responsibility is assumed by Measurement Computing Corporation neither for its use; nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation.

  • Page 5: Table Of Contents

    Chapter 1 Introducing the USB-1408FS........................ 8 USB-1408FS block diagram ..........................9 Software features ..............................9 Connecting a USB-1408FS to your computer is easy..................10 Chapter 2 Installing the USB-1408FS ........................11 What comes with your USB-1408FS shipment? ....................11 Hardware ..................................11 Additional documentation ..............................11...
  • Page 6 USB-1408FS User's Guide Non-volatile memory ............................30 Microcontroller ..............................30 Power ................................30 General ................................30 Environmental ..............................31 Mechanical ............................... 31 Main connector and pin out ..........................31 4-channel differential mode .............................31 8-channel single-ended mode ............................32 Declaration of Conformity ........................33...

  • Page 7: 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-1408FS, and refers you to related documents available on our web site, and to technical support resources.

  • Page 8: Introducing The Usb-1408Fs

    Chapter 1 Introducing the USB-1408FS This user's guide contains all of the information you need to connect the USB-1408FS to your computer and to the signals you want to measure. ® ® The USB-1408FS is a USB 2.0 full-speed, device that is supported under popular Microsoft Windows operating systems.

  • Page 9: Usb-1408Fs Block Diagram

    Figure 2. USB-1408FS functional block diagram Software features For information on the features of InstaCal and the other software included with your USB-1408FS, refer to the Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.

  • Page 10: Connecting A Usb-1408Fs To Your Computer Is Easy

    HID because it is a standard, and its performance delivers full control and maximizes data transfer rates for your USB-1408FS. No third-party device driver is required.  The USB-1408FS is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts to configure. ...

  • Page 11: Installing The Usb-1408Fs

    In addition to this hardware user's guide, you should also receive the Quick Start Guide (available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf). This booklet supplies a brief description of the software you received with your USB-1408FS and information regarding installation of that software. Please read this booklet completely before installing any software or hardware.

  • Page 12: Unpacking The Usb-1408Fs

    USB drivers. To connect the USB-1408FS to your system, turn your computer on, and 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 cable provides power and communication to the USB-1408FS.

  • Page 13: Calibrating The Usb-1408Fs

    USB-1408FS User's Guide Installing the USB-1408FS You can install up to two USB-1408FS units on most computers. If you need to connect more than two USB- 1408FS units to your computer, contact Tech Support by phone, fax, or e-mail: ...

  • Page 14: Chapter 3 Functional Details

    Functional Details Theory of operation - analog input acquisition modes The USB-1408FS can acquire analog input data in two different modes – software paced and continuous scan. Software paced mode In software paced mode, you can acquire one analog sample at a time. You initiate the A/D conversion by calling a software command.

  • Page 15: Usb Connector

    5 V. No external power supply is required. The LED on the front of the housing indicates the communication status of the USB-1408FS. It uses up to 5 mA of current and cannot be disabled. The table below defines the function of the USB-1408FS LED.

  • Page 16: Main Connector And Pin Out

    USB-1408FS User's Guide Functional Details Screw terminal – pins 21-40 The screw terminals on the bottom edge of the (pins 21 to 40) provide the following connections:  16 digital I/O connections ( , and PortA0 Port A7 Port B0 Port B7 ...
  • Page 17 USB-1408FS User's Guide Functional Details Pin 3 AGND Pin 1 Figure 5. Single-ended measurement connection Battery voltage should read as expected when the hardware is configured for single-ended mode. Single-ended measurements using differential channels To perform a single-ended measurement using differential channels, connect the signal to "CHn IN HI" input, and ground the associated "CHn IN LO"...
  • Page 18 USB-1408FS User's Guide Functional Details Measured Signal CHHI +/-8V 8V Differential CHLO Figure 6. Differential voltage example: common mode voltage of 0 V If you increase the common mode voltage to 11 V, the differential remains at ±8 V. Although the [common- mode voltage + signal] on each input now has a range of +7 V to +15 V, both inputs still satisfy the −10 V to...

  • Page 19: Analog Output Terminals (D/A Out 0 And D/A Out 1)

    USB-1408FS User's Guide Functional Details Sample inputs and differential results CHHI CHLO Result −20 V In Valid −15 V +5 V In Valid −10 V −10 V −10 V −20 V +10 V −10 V +10 V −20 V +20 V −10 V...

  • Page 20: Power Terminals

    USB-1408FS USB +5 V supply as follows: (USB-1408FS @ 80 mA) + (16 DIO @ 2.5 mA ea) + (2 AO @ 15 mA ea ) = 150 mA For an application running on a PC or powered hub, the maximum available excess current is 500 mA −...

  • Page 21: +2.5Vref Terminal

    Configure as an external clock input to externally source the A/D conversions. The SYNC terminal supports TTL-level input signals of up to 48 kHz.  Configure as an output to synchronize with a second USB-1408FS and acquire data from 16 channels. For information on synchronizing multiple units, refer to page 24. Ground terminals...
  • Page 22 Figure 12 shows an example of a USB-1408FS transfer function with a ±2.44 mV offset error. Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis.
  • Page 23 Combining these two error sources in Figure 14, we have a plot of the error band of the USB-1408FS for the ±10 V range. This is a graphical version of the typical accuracy specification of the product.

  • Page 24: Usb-1408Fs Channel Gain Queue Feature

    In the Gated mode, it is assumed that the clock signal will be held off for an adequate amount of time for setup to occur. No clock pulses are ignored. Use Gated mode if you want to use the USB-1408FS unit as a slave, and the source of the external clock is another USB unit.
  • Page 25 19 unit for input and enables pacing from the master USB-1408FS. Figure 15. Configuring for synchronous data acquisition EXTCLOCK When you are operating one USB-1408FS, do not set the option unless you are using an external clock for A/D pacing.

  • Page 26: Specifications

    Chapter 4 Specifications Typical for 25°C unless otherwise specified. Specifications in italic text are guaranteed by design. Analog input Table 1. Analog input specifications Parameter Conditions Specification A/D converter type Successive approximation type Input voltage range for linear operation, single-ended CHx to GND ±10 volts (V) max mode...
  • Page 27 The ADS7871 converter only returns 13-bits (0 to 8192 codes) in single-ended mode. Note 4: Extrapolating the long term drift accuracy specifications will provide the approximate long term drift of the USB-1408FS intermediate input ranges. Table 2. Accuracy, differential mode Range Absolute Accuracy 25°C (±mV)

  • Page 28: Analog Output

    Note 6: code region.. In this case, changes in digital input code at values less than 0x040 may not produce a corresponding change in the output voltage. The USB-1408FS offset error is tested and specified at code 0x040. Digital input/output Table 9.

  • Page 29: External Trigger

    USB-1408FS User's Guide Specifications External trigger Table 10. Digital trigger specifications Parameter Conditions Specification Trigger source (Note 7) External digital TRIG_IN Trigger mode Software Edge sensitive: user configurable for CMOS compatible rising or selectable falling edge. Trigger latency 10 µs max Trigger pulse width 1 µs min...

  • Page 30: Non-Volatile Memory

    Connected to externally-powered root port hub Connected to bus-powered hub 20 mA max This is the total current requirement for the USB-1408FS which includes up to 10 mA for the Note 10: status LED. Self-powered hub refers to a USB hub with an external power supply. Self-powered hubs allow a Note 11: connected USB device to draw up to 500 mA.

  • Page 31: Environmental

    USB-1408FS User's Guide Specifications Environmental Table 17. Environmental specifications Operating temperature range 0 to 70 °C –40 to 70 °C Storage temperature range Humidity 0 to 90% non-condensing Mechanical Table 18. Mechanical specifications Dimensions 79 millimeters (mm) long x 82 mm wide x 25 mm high...

  • Page 32: 8-Channel Single-Ended Mode

    USB-1408FS User's Guide Specifications 8-channel single-ended mode Signal Name Signal Name CH0 IN Port A0 CH1 IN Port A1 AGND Port A2 CH2 IN Port A3 CH3 IN Port A4 AGND Port A5 CH4 IN Port A6 CH5 IN Port A7...

  • Page 33: Declaration Of Conformity

    Norton, MA 02766 Category: Electrical equipment for measurement, control and laboratory use. Measurement Computing Corporation declares under sole responsibility that the product USB-1408FS to which this declaration relates is in conformity with the relevant provisions of the following standards or other...
  • Page 34 Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton, Massachusetts 02766 (508) 946-5100 Fax: (508) 946-9500 E-mail: info@mccdaq.com www.mccdaq.com...

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