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Measurement Computing USB-2416-4AO User Manual

Usb-based 24-bit, isolated, high-channel-count multifunction daq device with 4 analog outputs
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USB-2416-4AO
USB-based 24-bit, Isolated, High-Channel-Count Multifunction DAQ Device with 4 Analog Outputs
Document Revision 5A
May 2013
© Copyright 2013
User's Guide

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Summary of Contents for Measurement Computing USB-2416-4AO

  • Page 1 USB-2416-4AO USB-based 24-bit, Isolated, High-Channel-Count Multifunction DAQ Device with 4 Analog Outputs User's Guide Document Revision 5A May 2013 © Copyright 2013...
  • Page 2 Other product and company names mentioned herein are trademarks or trade names of their respective companies. © 2013 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.

  • Page 3: Table Of Contents

    Introducing the USB-2416-4AO ......................6 Overview: USB-2416-4AO features ........................6 Functional block diagram ........................... 6 Chapter 2 Installing the USB-2416-4AO........................ 7 What comes with your USB-2416-4AO shipment? .................... 7 Hardware ..................................7 Software .................................... 7 Documentation .................................. 7 Optional components ................................ 7 Unpacking................................
  • Page 4 Mechanical ............................... 41 Screw terminal connector type and pin-out ...................... 41 Screw terminal pin out ..............................42 Optional AI-EXP32 expansion module ......................44 AI-EXP32 screw terminal pin out ............................46 USB-2416-4AO screw terminal pin out (with AI-EXP32 attached) ................48 Declaration of Conformity ........................49...

  • Page 5: Preface

    What you will learn from this user's guide This user's guide explains how to install, configure, and use the USB-2416-4AO so that you get the most out of its analog I/O, thermocouple (TC) input, digital I/O, and counter/timer I/O features.

  • Page 6: Introducing The Usb-2416-4Ao

    USB-2416-4AO includes built-in cold-junction compensation and open thermocouple detection. You can add up to 32 single-ended or up to 16 differential channels by connecting the USB-2416-4AO to an AI-EXP32 expansion module. Each channel is software-configurable as single-ended or differential. For each channel pair configured differentially, you lose one SE channel.

  • Page 7: Installing The Usb-2416-4Ao

    Analog input expansion module adds up to 16 differential or 32 single-ended inputs to the USB-2416-4AO. ACC-202 Din-rail kit Accessory for mounting a USB-2416-4AO to a standard DIN rail. Use the thread-forming screws to attach the DIN rail clip to your device.

  • Page 8: Installing The Software

    Figure 3. USB-2416-4AO secured to an AI-EXP32 Connect the external power supply to the power input port of the USB-2416-4AO, and then plug it into an AC outlet. Connect the USB cable from the USB-2416-4AO to the host computer USB port.

  • Page 9: Configuring The Hardware

    Avoid touching board surfaces and onboard components. Only handle boards by their edges. Make sure the USB-2416-4AO does not come into contact with foreign elements such as oils, water, and industrial particulate. The discharge of static electricity can damage some electronic components. Semiconductor devices are especially susceptible to ESD damage.

  • Page 10: Screw Terminal Pin Out - Differential

    USB-2416-4AO User's Guide Installing the USB-2416-4AO Screw terminal pin out – differential Figure 4. 16-channel differential mode pin out Differential connection guidelines  When connecting differential voltage inputs to a "floating" voltage source, make sure there is a DC return path from each voltage input to ground.

  • Page 11: Screw Terminal Pin Out - Single-Ended

    Figure 5. 32-channel single-ended mode pin out Figure 6. DSUB37 expansion connector pinout The AI-EXP32 expansion port is intended to interface directly with the USB-2416-4AO. Do not attempt to use any of the expansion port pins for any other purpose.

  • Page 12: Chapter 3 Functional Details

     diagrams of signals using default or conventional device settings USB-2416-4AO components These USB-2416-4AO components are shown in Figure 7 and Figure 8.  One USB connector  One external power connector ...

  • Page 13: Leds

    USB-2416-4AO User's Guide Functional Details LEDs When the USB-2416-4AO is connected to a computer, in its normal idle state both LEDs are lit solid green. Power LED The Power LED is the top LED on the right side of the USB-2416-4AO housing.

  • Page 14: Analog Input Mode

    However, before handling thermocouple sensors, follow standard ESD practices and discharge any accumulated ESD charge. The USB-2416-4AO includes an ESD protection device at each of the analog input terminal block pins. If an ESD or transient voltage is coupled into the device, the input protection device(s) clamps the voltage to protect the thermocouple input circuitry from possible damage.

  • Page 15: Noise Filtering, Data Rate, And Throughput Rate

    Figure 9. Differential thermocouple connection example Noise filtering, data rate, and throughput rate Although the USB-2416-4AO A/D converter has a maximum data rate of 3,750 S/s, the actual throughput rate you observe for voltage and temperature data is determined by these formulas.

  • Page 16: Multiple-Channel Throughput Rates

    Figure 10. USB-2416-4AO A/D converter data rate vs. noise graph If low noise is your main concern, you can operate the USB-2416-4AO at very low data rates starting from 2.5 S/s. At low rates, much of the noise is averaged out of the data, and issues such as reference noise become less important.

  • Page 17: Analog Output Terminals (Vdac0 Through Vdac3)

    Analog outputs can be updated at a maximum rate of 1 kS/s. Digital I/O The USB-2416-4AO provides up to eight digital I/O lines with read/write rates of 500 port reads or single bit reads per second. Digital input voltage ranges of 0 V to 15 V are permitted, with thresholds of 0.6 V (low) and 2.6 V (high). Each DIO channel is an open-drain, which, when used as an output, is capable of sinking up to 150 mA for direct drive applications.

  • Page 18: Internal Pull-Up/Pull-Down Capability

    Figure 13. Digital output connection example Internal pull-up/pull-down capability Each of the eight DIO bits on the USB-2416-4AO has a 47 kΩ pull-up/pull-down resistor. To configure these bits for the 0 V pull-down option, you must open the USB-2416-4AO case to access the three-pin jumper labeled JP1.

  • Page 19: External Pull-Up/Pull-Down Capability

    Figure 16. Digital I/O external resistor configuration Counter input terminals (CTR0, CTR1) Two 32-bit event counters are built into the USB-2416-4AO. Each counter accepts frequency inputs up to 1 MHz. Refer to the Screw terminal pinout diagrams starting on page 10 for the location of these pins. The internal counter increments when the TTL levels transition from low to high.

  • Page 20: Usb-2416-4Ao Mechanical Drawings

    USB-2416-4AO User's Guide Functional Details USB-2416-4AO mechanical drawings Figure 17. Circuit board (top) and enclosure dimensions...

  • Page 21: Calibrating The Usb-2416-4Ao

    USB-2416-4AO once a year for a new factory calibration and calibration certificate. Self calibration Use InstaCal to calibrate the USB-2416-4AO whenever the ambient temperature changes by more than ±10 °C from the last self-calibration You can perform this procedure with thermocouple and voltage inputs connected to the input terminal blocks.

  • Page 22: Chapter 5 Specifications

    Chapter 5 Specifications All specifications are subject to change without notice. Typical for 25 °C unless otherwise specified. All specifications apply to all temperature and voltage input channels unless otherwise specified. Specifications in italic text are guaranteed by design. Analog input Table 1.

  • Page 23: Channel Configurations

    The accuracy errors shown do not include the inherent accuracy error of the thermocouple sensor itself. Contact your thermocouple supplier for details on the actual thermocouple sensor accuracy limitations. Connect thermocouples to the USB-2416-4AO such that they are floating with respect to GND (pins 18, 36, 39, 42, 44, 46, 66, 81, 84, 93, and 94).
  • Page 24 1.821 °C 1.408 °C To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its plastic enclosure.
  • Page 25 2.396 °C 1.941 °C To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its plastic enclosure.
  • Page 26 1.915 °C 1.524 °C To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its plastic enclosure.
  • Page 27 2.619 °C 2.123 °C To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its plastic enclosure.
  • Page 28 2.922 °C 2.332 °C To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its plastic enclosure.
  • Page 29 1.962 °C 1.601 °C To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its plastic enclosure.
  • Page 30 1.539 °C 1.175 °C To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its plastic enclosure.
  • Page 31 0.912 °C 0.551 °C To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its plastic enclosure.

  • Page 32: Analog Input Dc Voltage Measurement Accuracy

    USB-2416-4AO User's Guide Specifications Analog input DC voltage measurement accuracy Table 12. DC Accuracy components and specifications. All values are (±) Range Gain error Offset Absolute Gain Offset data (% of error error (% accuracy temperature temperature rate reading) coefficient (%...
  • Page 33 USB-2416-4AO User's Guide Specifications Range Gain error Offset Absolute Gain Offset data (% of error error (% accuracy temperature temperature rate reading) coefficient (% coefficient range) reading/°C) (µV/°C) 2000 S/s 0.0025 9 µV 0.0008 50.632 µV 0.0006 1000 S/s 0.0025 8 µV...

  • Page 34: Input Bandwidth

    USB-2416-4AO User's Guide Specifications Range Gain error Offset Absolute Gain Offset data (% of error error (% accuracy temperature temperature rate reading) coefficient (% coefficient range) reading/°C) (µV/°C) 60 S/s 0.035 6 µV 0.0009 33.866 µV 0.0006 50 S/s 0.035 6 µV...

  • Page 35: Channel Switching Error

    USB-2416-4AO User's Guide Specifications Table 15. RMS noise performance specifications (µVRMS) A/D data rate Range 3750 S/s 2000 S/s 1000 S/s 500 S/s 100 S/s 60 S/s 50 S/s 25 S/s 10 S/s 5 S/s 2.5 S/s ±20 V 34.90 28.32...

  • Page 36: Throughput Rate

    USB-2416-4AO User's Guide Specifications Throughput rate The single channel throughput rate is calculated using this formula: µ data rate Maximum throughput = Table 18. Single channel throughput rate specifications A/D data rate Maximum throughput (Hz) 3750 S/s 1102.94 2000 S/s 877.19...

  • Page 37: Analog Voltage Output

    Analog voltage output Unused VDACx output channels should be left disconnected. The USB-2416-4AO output voltage level defaults to 0 V whenever the host PC is reset, shut down or suspended, or if a reset command is issued to the device.

  • Page 38: Analog Input/Output Calibration

    USB-2416-4AO User's Guide Specifications Analog input/output calibration Table 24. Analog input/output calibration specifications Parameter Specifications Recommended warm-up time 45 minutes minimum Calibration Firmware calibration Calibration interval 1 year Calibration reference +10.000 V, ±5 mV maximum. Actual measured values stored in EEPROM Tempco: 5 ppm/°C maximum...

  • Page 39: Counter

    USB-2416-4AO User's Guide Specifications The external pull-up is connected to the digital output bit through an external pull-up resistor. Adding an Note 5: external pull-up resistor connects it in parallel with the internal 47 kΩ pull-up resistor of that particular digital input/output bit.

  • Page 40: Power

    Power jack polarity Center positive This is the total quiescent current requirement for the USB-2416-4AO which includes up to 10 mA for the Note 8: status LED. This does not include any potential loading of the digital I/O bits, +5V user terminal or the...

  • Page 41: Mechanical

    USB-2416-4AO User's Guide Specifications Mechanical Table 34. Mechanical specifications Dimensions 245 mm (L) x 146 mm (W) x 50 mm (H) User connection length 5 meters maximum Screw terminal connector type and pin-out Table 35. Screw terminal connector specifications Connector type...

  • Page 42: Screw Terminal Pin Out

    USB-2416-4AO User's Guide Specifications Screw terminal pin out For additional channel configurations when using the optional AI-EXP expansion device, refer to the "Optional AI-EXP32 expansion module" section on page 44. Table 36. 16-channel differential mode pin out Do not connect to terminal block pins labeled "NC."...
  • Page 43 USB-2416-4AO User's Guide Specifications Table 37. 32-channel single-ended mode pin out Do not connect to terminal block pins labeled "NC." Signal name Pin description Signal name Pin description No connect No connect CH0H Channel 0 CH15L Channel 31 CH0L Channel 16...

  • Page 44: Optional Ai-Exp32 Expansion Module

    Use the AI-EXP32 (sold separately) for applications that need additional analog/thermocouple input and digital I/O channels. See Measurement Computing web site for product details. The AI-EXP32 expansion port is intended to interface with a USB-2416 series product. Do not try to use any of the expansion port pins for any other purpose.
  • Page 45 USB-2416-4AO User's Guide Specifications Table 39. Multiple-channel throughput rate specifications (Hz), USB-2416-4AO and optional AI-EXP32 expansion module 3750 S/s 2000 S/s 1000 S/s 500 S/s 100 S/s 60 S/s 50 S/s 25 S/s 10 S/s 5 S/s 2.5 S/s Number...

  • Page 46: Ai-Exp32 Screw Terminal Pin Out

    USB-2416-4AO User's Guide Specifications AI-EXP32 screw terminal pin out Table 40. 32-channel differential mode pin out Do not connect to terminal block pins labeled "NC." Signal name Pin description Signal name Pin description CH16H Channel 16 HI CH31L Channel 31 LO...
  • Page 47 USB-2416-4AO User's Guide Specifications Table 41. 32-channel single-ended mode pin out Do not connect to terminal block pins labeled "NC." Signal name Pin description Signal name Pin description CH16H Channel 16 CH31L Channel 63 CH16L Channel 48 CH31H Channel 31...

  • Page 48: Usb-2416-4Ao Screw Terminal Pin Out (With Ai-Exp32 Attached)

    USB-2416-4AO User's Guide Specifications USB-2416-4AO screw terminal pin out (with AI-EXP32 attached) Table 42. USB-2416-4AO single-ended mode pin out with AI-EXP32 connected Do not connect to terminal block pins labeled "NC." Signal name Pin description Signal name Pin description No connect...

  • Page 49: 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-2416-4AO 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 50 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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