Related Manuals for Measurement Computing USB-1408FS-Plus
Summary of Contents for Measurement Computing USB-1408FS-Plus
- Page 1 USB-1408FS-Plus Analog and Digital I/O User's Guide Document Revision 4a November 2014 © Copyright 2014...
- Page 2 © 2014 Measurement Computing Corporation. All rights reserved. No part of this publication may be 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.
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Page 3: Table Of Contents
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-1408FS-Plus ....................... 6 Functional block diagram ........................... 6 Chapter 2 Installing the USB-1408FS-Plus ......................7 What comes with your shipment? ........................ - Page 4 USB-1408FS-Plus User's Guide Counter ................................25 Memory ................................25 Microcontroller ..............................25 Power ................................25 General ................................26 Environmental ..............................26 Mechanical ............................... 26 Screw terminal connector ..........................26 Differential mode pinout ..............................27 Single-ended mode pinout ...............................27 Declaration of Conformity ........................28...
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Page 5: Preface
Preface About this User's Guide What you will learn from this user's guide This user's guide describes the Measurement Computing USB-1408FS-Plus 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. -
Page 6: Introducing The Usb-1408Fs-Plus
The device is powered by the +5 V USB supply from the computer. No external power is required. The USB-1408FS-Plus 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). -
Page 7: Installing The Usb-1408Fs-Plus
USB-1408FS-Plus. Install the software before you install your device The driver needed to run the USB-1408FS-Plus is installed with the software. Therefore, you need to install the software package you plan to use before you install the hardware. -
Page 8: Calibrating The Hardware
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. The USB-1408FS-Plus does not support field calibration. -
Page 9: Chapter 3 Functional Details
The USB-1408FS-Plus can acquire analog input data in either software paced or continuous scan mode. Software paced The USB-1408FS-Plus 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. -
Page 10: External Components
USB-1408FS-Plus User's Guide Functional Details External components The external components – screw terminal banks, LED, and USB connector –are shown in Figure 2. Screw terminal pins 21 to 40 Screw terminal pins 1 to 20 USB connector Figure 2. External components USB connector Receives the supplied USB cable. - Page 11 USB-1408FS-Plus User's Guide Functional Details The single-ended mode pinout is shown in Figure 3. Figure 3. Single-ended mode pinout The differential mode pinout is shown in Figure 4. Figure 4. Differential mode pinout...
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Page 12: Signal Connections
USB-1408FS-Plus User's Guide Functional Details Signal connections Analog input You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 ( CH0 IN through CH7 IN You can configure the analog input channels as eight single-ended channels or four differential channels. When configured for differential mode, each analog input has 14-bit resolution. - Page 13 USB-1408FS-Plus User's Guide Functional Details For example, you input a 4 V pp sine wave to CH# IN HI, and apply the same sine wave 180° out of phase to CH# IN LO. The common mode voltage is 0 V. The differential input voltage swings from 4 V – (–4 V) = 8 V to –4 V –...
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Page 14: Analog Output
USB-1408FS-Plus User's Guide Functional Details The table below shows some possible inputs and the expected results. Sample inputs and differential results CH# IN HI CH# IN LO Result −20 V Invalid −15 V +5 V Invalid −10 V −10 V −10 V... -
Page 15: Digital I/O
USB-1408FS-Plus User's Guide Functional Details Digital I/O The device has 16 DIO channels that are configured as two 8-bit ports – Port A and Port B. Port B is high drive. You can connect up to eight DIO lines to... -
Page 16: Counter Input
There are three types of errors which affect the accuracy of a measurement system: offset gain nonlinearity The primary error sources in the USB-1408FS-Plus are offset and gain. Nonlinearity is small in each device, and is not significant as an error source with respect to offset and gain. - Page 17 USB-1408FS-Plus User's Guide Functional Details Figure 11 shows an ideal, error-free transfer function. The typical calibrated accuracy is range-dependent. Refer to the "Accuracy specifications" on page 22 for more information. We use a ±10 V range here as an example of what you can expect when performing a measurement in this range.
- Page 18 USB-1408FS-Plus User's Guide Functional Details Gain error is a change in the slope of the transfer function from the ideal, and is typically expressed as a percentage of full-scale. Figure 13 shows the transfer function with gain error. Gain error is easily converted to voltage by multiplying the full-scale ( ) input by the error.
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Page 19: Synchronized Operations
<500 mA. The maximum output current that is available at the +VO power output terminal is 100 mA. With all outputs at their maximum output current, the USB-1408FS-Plus in a fully-loaded configuration may be above that allowed by the computer. In this case, determine the per-pin loading in the application to ensure that the maximum loading criteria is met. -
Page 20: Mechanical Drawings
USB-1408FS-Plus User's Guide Functional Details Mechanical drawings Figure 15. Circuit board (top) and enclosure dimensions... -
Page 21: Specifications
Chapter 4 Specifications All specifications are subject to change without notice. Typical for 25°C unless otherwise specified. Specifications in italic text are guaranteed by design. Analog input Table 1. Analog input specifications Parameter Condition Specification A/D converter type Successive approximation type Input voltage range for linear operation CHx to GND Single-ended mode: ±10 V max... -
Page 22: Accuracy
USB-1408FS-Plus User's Guide Specifications Accuracy Table 2. Accuracy, differential mode Range Absolute Accuracy 25 °C (±mV) Absolute Accuracy 0 °C to 50°C (±mV) ±20 V 10.98 49.08 ±10 V 7.32 33.42 ±5 V 3.66 20.76 ±4 V 2.92 19.02 ±2.5 V 1.83... -
Page 23: Digital Input/Output
USB-1408FS-Plus User's Guide Specifications Table 7. Analog output accuracy, all values are (±); accuracy tested at no load Range Accuracy (LSB) 0 V to 5.0 V 4.0 typ, 45.0 max Table 8. Analog output accuracy components, all values are (±) -
Page 24: External Trigger
USB-1408FS-Plus User's Guide Specifications External trigger Table 10. Digital trigger specifications Parameter Specification Trigger source (Note 7) External digital; TRIG_IN terminal Trigger mode Edge sensitive; software-selectable for CMOS compatible rising or falling edge, high or low level. Trigger latency 10 µs max Trigger pulse width 1 µs min... -
Page 25: Counter
USB-1408FS-Plus User's Guide Specifications Counter Table 12. Counter specifications Parameter Specification Pin name Counter type Event counter Number of channels Schmitt trigger, 47 kΩ pull-down to ground, rising edge triggered Input type Input source CTR screw terminal Resolution 32 bits... -
Page 26: General
USB-1408FS-Plus User's Guide Specifications General Table 16. General specifications Parameter Specification Device type USB 2.0 full speed Device compatibility USB 1.1, USB 2.0 Environmental Table 17. Environmental specifications Parameter Specification Operating temperature range 0 °C to 70 °C –40 °C to 70 °C... -
Page 27: Differential Mode Pinout
USB-1408FS-Plus User's Guide Specifications Differential mode pinout Table 20. 4-channel differential mode pinout Signal name Pin description Signal name Pin description CH0 IN HI Analog input 0+ Port A0 Port A bit 0 CH0 IN LO Analog input 0– Port A1... -
Page 28: 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-Plus to which this declaration relates is in conformity with the relevant provisions of the following standards or other documents: EC EMC Directive 2004/108/EC: General Requirements, EN 61326-1:2006 (IEC 61326-1:2005). - Page 29 Measurement Computing Corporation NI Hungary Kft 10 Commerce Way H-4031 Debrecen, Hátar út 1/A, Hungary Norton, Massachusetts 02766 Phone: +36 (52) 515400 (508) 946-5100 Fax: +36 (52) 515414 Fax: (508) 946-9500 http://hungary.ni.com/debrecen E-mail: info@mccdaq.com www.mccdaq.com...
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