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Summary of Contents for Measurement Computing us-1208fs
- Page 1 USB-1208FS Analog and Digital I/O User's Guide Document Revision 10A July 2014 © Copyright 2014...
- Page 2 Other product and company names mentioned herein are trademarks or trade names of their respective companies. © 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
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-1208FS........................ 6 USB-1208FS block diagram .......................... - Page 4 USB-1208FS User's Guide Power ................................25 General ................................25 Environmental ..............................25 Mechanical ............................... 25 Screw terminal connector ..........................26 Differential mode pinout ..............................26 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-1208FS 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. -
Page 6: Introducing The Usb-1208Fs
Chapter 1 Introducing the USB-1208FS The USB-1208FS-Plus is an analog input and digital I/O data acquisition device that provides the following features: Eight analog input channels that are software-selectable for either eight 11-bit single-ended inputs or four 12-bit differential inputs ... -
Page 7: Installing The Usb-1208Fs
USB-1208FS from its packaging, ground yourself using a wrist strap or touch either the computer chassis or other grounded object to eliminate any stored static charge. If the device is damaged, notify Measurement Computing Corporation immediately by phone, fax, or email. ... - Page 8 USB-1208FS User's Guide Installing the USB-1208FS If the LED turns off If communication is lost between the device and the computer, the 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.
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Page 9: Chapter 3 Functional Details
Chapter 3 Functional Details Analog input acquisition modes The USB-1208FS can acquire analog input data in either software paced or hardware paced mode. Software paced The USB-1208FS acquires data one analog sample at a time using software-paced mode. You initiate the A/D conversion by calling a software command. -
Page 10: External Components
USB-1208FS 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 The USB connector provides +5V power and communication. -
Page 11: Signal Connections
USB-1208FS User's Guide Functional Details Figure 3. Single-ended mode pinout The differential mode pinout is shown in Figure 4. Figure 4. Differential mode pinout Signal connections Analog input You can connect up to eight single-ended analog input connections to CH0 IN through CH7 IN , or four... - Page 12 USB-1208FS User's Guide Functional Details 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 12-bit resolution. When configured for single-ended mode, each analog input has 11-bit resolution, due to restrictions imposed by the A/D converter. Single-ended configuration When configured for single-ended input mode, eight analog channels are available.
- Page 13 USB-1208FS User's Guide Functional Details Figure 6. Differential voltage example: common mode voltage of 11 V If you decrease the common-mode voltage to –7 V, the differential stays at ±8 V. However, the solution now violates the input range condition of –10 V to +20 V. The voltage on each analog input now swings from –3 V to –11 V.
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Page 14: Analog Output
USB-1208FS User's Guide Functional Details Channel-Gain queue The channel gain queue feature allows you to set up a scan sequence with a unique per-channel gain setting and channel sequence. The gain settings are stored in a channel-gain queue list that is written to local memory on the device. -
Page 15: Counter Input
USB-1208FS User's Guide Functional Details If the p/n of your board is earlier than hardware revision D, the default configuration is pull-up. To configure for pull-down, the board must be modified at the factory. If your board has user-configurable jumpers, complete the following steps to set the pull-up/down configuration: Unplug the device from the computer. -
Page 16: Calibration Output
USB-1208FS User's Guide Functional Details Configure as an output to pace conversions on a second USB-1208FS device and acquire data from 16 channels. For more information synchronized operations see page 18. Calibration output terminal is an output used only to calibrate the device. Calibration is software-controlled via InstaCal. Ground The analog ground ( ) terminals provide a common ground for all analog channels. - Page 17 USB-1208FS User's Guide Functional Details Figure 11 shows an ideal, error-free, USB-1208FS transfer function. The typical calibrated accuracy of the USB-1208FS is range-dependent, as explained in the Specifications chapter on page 20. We use a ±10 V range here as an example of what you can expect when performing a measurement in this range. Figure 11.
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Page 18: Synchronized Operations
USB-1208FS User's Guide Functional Details The accuracy plots in Figure 13 are drawn for clarity and are not drawn to scale. Figure 13. ADC Transfer function with gain error For example, the USB-1208FS exhibits a typical calibrated gain error of ±0.2% on all ranges. For the ±10 V range, this would yield 10 V ×... -
Page 19: Mechanical Drawings
USB-1208FS User's Guide Functional Details Mechanical drawings Figure 15. Circuit board (top) and enclosure dimensions... -
Page 20: 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 Conditions Specification A/D converter type Successive approximation type Input voltage range for linear operation, CHx to GND ±10 volts (V) max... - Page 21 USB-1208FS User's Guide Specifications Table 2. Accuracy, differential mode Range Accuracy (LSB) ±20 V ±10 V ±5 V ±4 V ±2.5 V 12.1 ±2 V 14.1 ±1.25 V 20.1 ±1 V 24.1 Table 3. Accuracy, single-ended mode Range Accuracy (LSB) ±10 V Table 4.
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Page 22: Analog Output
USB-1208FS User's Guide Specifications Analog output Table 8. Analog output specifications Parameter Conditions Specification Resolution 12-bits, 1 in 4096 Output range 0 V to 4.096 V, 1 mV per LSB Number of channels Throughput (Note 4) Software paced 250 S/s single channel typical, PC dependent Single channel, continuous scan 10 kS/s Dual channel, continuous scan,... -
Page 23: External Trigger
USB-1208FS User's Guide Specifications External trigger Table 12. External digital trigger specifications Parameter Conditions Specification Trigger source External, digital TRIG_IN Trigger mode Software-selectable Edge sensitive: user configurable for CMOS compatible rising or falling edge Trigger latency 10 µs max Trigger pulse width 1 µs min Schmitt trigger, 47 kΩ... -
Page 24: Counter
USB-1208FS User's Guide Specifications Counter Table 14. 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 Maximum input frequency 1 MHz High pulse width... -
Page 25: Power
USB-1208FS User's Guide Specifications Power Table 17. Power specifications Parameter Conditions Specification Supply current (Note 6) 80 mA +5V USB power available (Note 7) Connected to self-powered hub 4.5 V min, 5.25 V max Connected to externally-powered root port hub Connected to bus-powered hub 4.1 V min, 5.25 V max Output current (Note 8) -
Page 26: Screw Terminal Connector
USB-1208FS User's Guide Specifications Screw terminal connector Table 21. Screw terminal specifications Parameter Specification Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG Differential mode pinout Table 22. 4-channel differential mode pinout Signal Name Signal Name CH0 IN HI Port A0 CH0 IN LO Port A1... -
Page 27: Single-Ended Mode Pinout
USB-1208FS User's Guide Specifications Single-ended mode pinout Table 23. 8-channel single-ended mode pinout 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 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-1208FS 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 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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