Related Manuals for Measurement Computing USB-1808X
Summary of Contents for Measurement Computing USB-1808X
- Page 1 USB-1808X Eight-Channel Simultaneous-Sampling Multifunction Device User's Guide May 2019. Rev 4 © Measurement Computing Corporation...
- Page 2 Other product and company names mentioned herein are trademarks or trade names of their respective companies. © 2019 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-1808X ........................6 Functional block diagram ........................... 6 Chapter 2 Installing the USB-1808X ........................7 Unpacking................................ - Page 4 USB-1808X User's Guide Noise performance ................................19 Analog output ..............................20 Analog input/output calibration ........................21 Digital input/output............................21 Counter ................................22 Quadrature inputs ................................22 Timer ................................23 External clock input/output..........................23 External trigger ..............................24 Pattern trigger ..............................24 Memory ................................24 Power ................................
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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-1808X 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-1808X
The device is powered by the +5 V USB supply from the computer, requiring no external power. The USB-1808X is a USB 2.0 high-speed device that is fully compatible with both USB 1.1, USB 2.0, and USB 3.0 ports. -
Page 7: Installing The Usb-1808X
Installing the hardware To connect the USB-1808X to your system, 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. -
Page 8: Functional Details
Chapter 3 Functional Details External components The USB-1808X has the following external components (see Figure 2 through Figure 4 on pgs. 9-10): USB connector LEDs Screw terminals USB connector The USB connector provides +5 V power and communication. No external power supply is required. - Page 9 USB-1808X User's Guide Functional Details Figure 2. DIFF mode pinout Figure 3. SE mode pinout...
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Page 10: Leds
Functional Details LEDs The USB-1808X has two LED indicators that indicate the status of power and data. The LEDs are stacked one above the other, as shown in Figure 4. LED turns on when the device is detected by the computer. -
Page 11: Analog Output
Turn the device over and rest the top of the housing on a flat, stable surface. Caution! The discharge of static electricity can damage some electronic components. Before removing the USB-1808X from its housing, ground yourself using a wrist strap or touch the computer chassis or other grounded object to eliminate any stored static charge. -
Page 12: Counter Input
Counter inputs can be read asynchronously under program control, or synchronously as part of a digital scan group. terminals are 32-bit general-purpose counters that can accept frequency inputs up to CTR0 CTR1 50 MHz. The USB-1808X supports the following counter input modes: Totalize Period measurement Pulse-width measurement ... -
Page 13: Totalize Counter Mode
X1, X2, and X4 count modes are supported. The USB-1808X provides A, B, and Z inputs – ENCxA, ENCxB, and ENCxZ – for each connected encoder. A typical encoder generates the A and B signals at a 90° phase shift with respect to each other. These signals are used to determine system position (counts), velocity (counts per second), and direction of travel or rotation. -
Page 14: Timer Output
(idle high or idle low) The time delay can range from 0 seconds to 42.94 seconds. Figure 8. USB-1808X PWM timer channel Timer output operations can be paced by the internal clock or by an external clock ( – refer to Clock I/O OCLKI on page 15). -
Page 15: Synchronous I/O - Mixing Analog, Digital, And Counter Scanning
Synchronous I/O – mixing analog, digital, and counter scanning The USB-1808X can read analog, digital, and counter inputs, and generate up to two analog outputs and one digital pattern output at the same time. Digital and counter inputs do not affect the overall A/D rate because these inputs use no time slot in the scanning sequencer. -
Page 16: Ground
USB-1808X User's Guide Functional Details In Figure 10 all mask bits are excluded except bit 3. The result of this operation is that only bit 3 is included in the pattern to detect. Figure 10. Trigger mask with some bits excluded... -
Page 17: Mechanical Drawings
USB-1808X User's Guide Functional Details Mechanical drawings Figure 11. USB-1808X circuit board (top) and enclosure dimensions... -
Page 18: 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. General analog input specifications Parameter Condition Specification A/D converter type Simultaneous ADC resolution 18 bits... -
Page 19: Accuracy
USB-1808X User's Guide Specifications Accuracy Analog input DC voltage measurement accuracy Table 2. DC accuracy components and specifications. All values are (±) Absolute Gain Offset Gain error Offset INL error accuracy at temperature temperature (% of error (% of Full Scale... -
Page 20: Analog Output
USB-1808X User's Guide Specifications Analog output Table 5. Analog output specifications Parameter Condition Specification Number of channels Resolution 16 bits Output ranges Calibrated ±10 V Output transient Host computer is reset, powered on, Duration: 5 ms suspended, or a reset command is issued... -
Page 21: Analog Input/Output Calibration
USB-1808X User's Guide Specifications Analog input/output calibration Table 9. Analog I/O calibration specifications Parameter Specification Warm-up time 15 minutes recommended min Calibration method Factory calibration Calibration interval 1 year Digital input/output Table 10. Digital I/O specifications Parameter Specification Digital type... -
Page 22: Counter
USB-1808X User's Guide Specifications Counter Table 11. Counter specifications Parameter Specification Terminal names CTR0, CTR1 Number of channels 2 channels Resolution 32-bit Counter type FPGA Counter input modes Totalize, Pulse width, Period Input type Schmitt trigger, 33 Ω series resistor, 47 kΩ pull-down to ground... -
Page 23: Timer
USB-1808X User's Guide Specifications Timer Table 13. Timer specifications Parameter Specification Terminal name TMR0, TMR1 Timer type PWM output with count, period, delay, and pulse width registers Output value Default state is idle low with pulses high, software-selectable output invert... -
Page 24: External Trigger
USB-1808X User's Guide Specifications External trigger Table 15. External trigger specifications Parameter Specification Trigger source ITRIG for inputs, OTRIG for outputs Trigger mode Software programmable for edge or level sensitive, rising or falling edge, high or low level. Power on default is edge sensitive, rising edge. -
Page 25: Usb
USB-1808X User's Guide Specifications Table 19. USB specifications Parameter Specification USB device type USB 2.0 (high-speed) Device compatibility USB 1.1, USB 2.0, USB 3.0 USB cable type A-B cable, UL type AWM 2725 or equivalent. (Min 24 AWG VBUS/GND, min 28 AWG D+/D–) USB cable length 3 m (9.84 ft) max... -
Page 26: Differential Mode Pinout
USB-1808X User's Guide Specifications Differential mode pinout Table 23. 8-channel differential mode pinout Terminal Terminal Label Label CH0H AI channel 0 HI CH7L AI channel 7 LO CH0L AI channel 0 LO CH7H AI channel 7 HI AGND Analog ground... -
Page 27: Single-Ended Mode Pinout
USB-1808X User's Guide Specifications Single-ended mode pinout Table 24. 16-channel single-ended mode pinout Terminal Terminal Label Label CH0H AI channel 0 HI No connection No connection CH7H AI channel 7 HI AGND Analog ground AGND Analog ground CH1H AI channel 1 HI... -
Page 28: Eu Declaration Of Conformity
March 23, 2017, Norton, Massachusetts USA Test Report Number: EMI6990.17 Measurement Computing Corporation declares under sole responsibility that the product USB-1808X is in conformity with the relevant Union Harmonization Legislation and complies with the essential requirements of the following applicable European Directives:... - 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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