Data Translation DT9847-1-1, DT9847-3-1, DT9847-2-2 User Manual

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UM-24847-L

DT9847 Series User’s Manual

Title Page

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Notice

Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and/or devices without prior written consent from Measurement Computing Corporation. Life support devices/systems are devices or systems that, a) are intended for surgical implantation into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result in injury. Measurement Computing Corporation products are not designed with the components required, and are not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people.

Trademark and Copyright Information

Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation. Refer to the Copyrights & Trademarks section on mccdaq.com/legal for more information about Measurement Computing trademarks.

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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Radio and Television Interference

This equipment has been tested and found to comply with CISPR EN55022 Class A and EN61000-6-1 requirements and also with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case the user will be required to correct the interference at his own expense.

Changes or modifications to this equipment not expressly approved by Data Translation could void your authority to operate the equipment under Part 15 of the FCC Rules.

Note: This product was verified to meet FCC requirements under test conditions that included use of shielded cables and connectors between system components. It is important that you use shielded cables and connectors to reduce the possibility of causing interference to radio, television, and other electronic devices.

FCC Page

Canadian Department of Communications Statement

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique édicté par le Ministère des Communications du Canada.

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Table of Contents

About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Intended Audience. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

How this Manual is Organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Conventions Used in this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Related Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Where To Get Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chapter 1: Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Key Features of the DT9847-1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Key Features of the DT9847-2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Key Features of the DT9847-3-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Supported Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Supported Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Getting Started Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter 2: Setting Up and Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Applying Power to the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Attaching Modules to the Computer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Connecting Directly to the USB Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Connecting to an Expansion Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Configuring the DT9847 Series Device Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Chapter 3: Wiring Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Preparing to Wire Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Wiring Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Warm-Up Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Wiring Signals to the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Connecting Analog Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Connecting an Analog Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Connecting Digital I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Chapter 4: Verifying the Operation of a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Select the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Acquire Data from an Analog Output Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Configure the Analog Output Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Configure the Analog Input Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Configure the Recording Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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Contents

Configure the Acquisition Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Start the Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Chapter 5: Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Analog Input Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Analog Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Input Ranges and Gains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

IEPE Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Input Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Input Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Configuration Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Analog Input Conversion Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Single-Value Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Single-Values Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Continuous Scan Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Input Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Start Trigger Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Reference Trigger Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Data Format and Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Analog Output Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Analog Output Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Output Ranges and Gains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Output Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Output Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Output Conversion Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Single-Value Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Waveform Generation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Continuous Analog Output Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Output Trigger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Data Format and Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Digital I/O Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Digital I/O Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Operation Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Triggering Acquisition on Multiple Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Synchronizing Acquisition on Multiple DT9847 Series Modules . . . . . . . . . . . . . . . . . . . . . 79

Triggering DT9847 and DT9837 Series Modules Using the Sync Bus. . . . . . . . . . . . . . 81

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Chapter 6: Supported Device Driver Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Data Flow and Operation Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Buffering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Triggered Scan Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Data Encoding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Current and Resistance Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Thermocouple, RTD, and Thermistor Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

IEPE Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Bridge and Strain Gage Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Start Triggers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Reference Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Clocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Counter/Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Tachometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Contents

Chapter 7: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

General Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

If Your Module Needs Factory Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Chapter 8: Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Using the Calibration Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Calibrating the Analog Input Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Warming up the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Connecting a Precision Voltage Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Using the Auto-Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Using the Manual Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Calibrating the Analog Output Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Analog Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Analog Output Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Digital I/O Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Trigger Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Master Oscillator Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Power, Physical, and Environmental Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Regulatory Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Connector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

External Power Supply Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

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Contents

Appendix B: Connector Pin Assignments and LED Status Indicators . . . . . . . . . 127

Digital I/O and External Trigger Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

External USB Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

External Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

STP15 Screw Terminal Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

LED Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Appendix C: Powering OEM Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Powering the DT9847-1-1-OEM Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Powering the DT9847-2-2-OEM or DT9847-3-1-OEM Module . . . . . . . . . . . . . . . . . . . . . . 136

Appendix D: Register-Level Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Writing to the EEPROM Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Page 9

The first part of this manual describes how to install and set up your DT9847 Series module and device driver, and verify that your module is working properly.

The second part of this manual describes the features of the DT9847 Series modules, the capabilities of the DT9847 Series Device Driver, and how to program the DT9847 module using the DT-Open Layers for .NET Class Library software. Troubleshooting information is also provided.

Note: For more information on the class library, refer to the DT-Open Layers for .NET Class Library User’s Manual. If you are using the DataAcq SDK or a software application to program

your device, refer to the documentation for that software for more information.

Intended Audience

This document is intended for engineers, scientists, technicians, or others responsible for using and/or programming a DT9847 Series module for data acquisition operations in the Microsoft® Windows Vista, Windows 7, Windows 8, or Windows 10 operating system. It is assumed that you have some familiarity with data acquisition principles and that you understand your application.

About this Manual

How this Manual is Organized

This manual is organized as follows:

• Chapter 1, “Overview,” describes the major features of the DT9847 Series module, as well as the supported software and accessories for the modules.

• Chapter 2, “Setting Up and Installing the Module,” describes how to install a DT9847 Series module, how to apply power to the module, and how to configure the DT9847 Series Device Driver.

• Chapter 3, “Wiring Signals,” describes how to wire signals to a DT9847 Series module.

• Chapter 4, “Verifying the Operation of a Module,” describes how to verify the operation of a DT9847 Series module with the QuickDAQ application.

• Chapter 5, “Principles of Operation,” describes all of the features of the DT9847 Series module and how to access them in your application.

• Chapter 6, “Supported Device Driver Capabilities,” lists the data acquisition subsystems and the associated features accessible using the DT9847 Series Device Driver.

• Chapter 7, “Troubleshooting,” provides information that you can use to resolve problems with the DT9847 Series module and DT9847 Series Device Driver, should they occur.

• Chapter 8, “Calibration,” describes how to calibrate the analog I/O circuitry of the DT9847 module.

Page 10

About this Manual

Conventions Used in this Manual

• Appendix A, “Specifications,” lists the specifications of the DT9847 Series module.

• Appendix B, “Connector Pin Assignments and LED Status Indicators,” lists the pin assignments of the connectors on the DT9847 Series module, the screw terminal assignments of the STP15 screw terminal panel, and describes the LED status indicators on the DT9847 Series module.

• Appendix C, “Powering OEM Modules,” describes how to apply power to OEM modules.

• Appendix D, “Register-Level Programming,” describes how to write to the registers of the DT9847 Series modules to change the default settings that are defined in the Open Layers Control Panel programmatically.

• An index completes this manual.

The following conventions are used in this manual:

• Notes provide useful information or information that requires special emphasis, cautions provide information to help you avoid losing data or damaging your equipment, and warnings provide information to help you avoid catastrophic damage to yourself or your equipment.

• Items that you select or type are shown in bold.

Related Information

Refer to the following documents for more information on using the DT9847 Series module:

• QuickDAQ User’s Manual (UM-24774). This manual describes how to create a QuickDAQ application to acquire and analyze data from a DT-Open Layers data acquisition module.

• DT-Open Layers for .NET User’s Manual (UM-22161). For programmers who are developing their own application programs using Visual C# or Visual Basic .NET, this manual describes how to use the DT-Open Layers for .NET Class Library to access the capabilities of Data Translation data acquisition devices.

• DataAcq SDK User’s Manual (UM-18326). For programmers who are developing their own application programs using the Microsoft C compiler, this manual describes how to use the DT-Open Layers DataAcq SDK to access the capabilities of Data Translation data acquisition devices.

• LV-Link Online Help. This help file describes how to use LV-Link with the LabVIEW graphical programming language to access the capabilities of Data Translation data acquisition devices.

• Microsoft Windows 7, Windows 8, or Windows 10 documentation.

•USB web site (http://www.usb.org)

Page 11

Where To Get Help

Should you run into problems installing or using a DT9847 Series module, the Technical Support Department is available to provide technical assistance. Refer to Chapter 7 for more information. If you are outside the United States or Canada, call your local distributor, whose number is listed on our web site www.mccdaq.com.

About this Manual

Page 12

About this Manual

Page 13

Overview

Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Supported Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Supported Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Getting Started Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Page 14

Chapter 1

Hardware Features

DT9847 Series modules are high-accuracy, dynamic signal acquisition modules for the USB (Ver. 2.0 or Ver. 1.1) bus. These modules are ideal for acoustic measurements due to their AC coupling and frequency characteristics. Figure 1 shows the DT9847-3-1 module.

Figure 1: DT9847-3-1 Module

Table 1 lists the major differences between the modules.

Table 1: Major Differences Between the DT9847 Series Modules

Feature DT9847-1-1 DT9847-2-2 DT9847-3-1

Number of Analog Input Channels 1 2 3

Number of Analog Output Channels 1 2 1

Power USB Power

a. Using USB-Y cable. b. Using a 5 V to 24 V external power supply at 5 W.

External Power

Page 15

Key Features of the DT9847-1-1

The key features of the DT9847-1-1 module are as follows:

• Simultaneous analog input and waveform analog output operations

• Operates on internal USB power using a USB-Y cable

• Analog input subsystem:

 One 24-bit A/D converter

 Throughput rate from 1 kSamples/s to 216 kSamples/s

 Input range of ±10 V with software-selectable gains of 1 and 10 for an effective input

range of ±10 V and ±1 V

 Support for IEPE (Integrated Electronic Piezoelectric) inputs, including use of a 4 mA

current source with 18 V compliance voltage for AC or DC coupling

 Supports a start trigger for acquiring pre-trigger samples and a reference trigger for

acquiring post-trigger samples. You can specify the number of post-trigger samples to acquire before stopping the operation.

 For the start trigger, supports a software-programmable trigger source (software,

external digital trigger, or a positive- or negative-going analog threshold trigger. For the threshold trigger, you can program the threshold value from –10 V to +10 V.

Overview

 For the reference trigger, supports an external digital trigger or a positive- or

negative-going analog threshold trigger. You can program the threshold value from –10 V to +10 V.

• Analog output subsystem:

 One 32-bit D/A converter

 Single value, waveform, and continuous streaming output

 Programmable output rate from 30 kSamples/s to 216 kSamples/s

 Output range of ±3 V or ±10 V, software-programmable

 Software-programmable trigger source (software trigger or external digital trigger) to

start the analog output operation

• Internal clock source (shared between the analog input and analog output subsystems)

• Four digital input lines and 4 digital output lines

• Sync Bus (RJ45) connector for synchronizing acquisition on up to four DT9847 Series modules

Page 16

Chapter 1

Key Features of the DT9847-2-2

The key hardware features of the DT9847-2-2 module are as follows:

• Simultaneous analog input and analog output operations (continuous or waveform mode)

• Operates on external USB power

• Analog input subsystem:

 Two, simultaneous 24-bit A/D converters

 Throughput rate from 1 kSamples/s to 216 kSamples/s for simultaneous,

high-resolution measurements

 Input range of ±10 V with software-selectable gains of 1 and 10 for an effective input

range of ±10 V and ±1 V

 Support for IEPE (Integrated Electronic Piezoelectric) inputs, including use of a 4 mA

current source with 18 V compliance voltage for AC or DC coupling

 Supports a start trigger for acquiring pre-trigger samples and a reference trigger for

acquiring post-trigger samples. You can specify the number of post-trigger samples to acquire before stopping the operation.

 For the start trigger, supports a software-programmable trigger source (software,

external digital trigger, or a positive- or negative-going analog threshold trigger on any of the analog input channels). For the threshold trigger, you can program the threshold value from –10 V to +10 V.

 For the reference trigger, supports an external digital trigger or a positive- or

negative-going analog threshold trigger on any of the analog input channels. You can program the threshold value from –10 V to +10 V.

• Analog output subsystem:

 Two 32-bit D/A converters

 Single value, waveform, and continuous streaming output

 Programmable output rate from 30 kSamples/s to 216 kSamples/s

 Output range of ±3 V or ±10 V, software programmable

 Software-programmable trigger source (software trigger or external digital trigger) to

start the analog output operation

• Internal clock source (shared between the analog input and analog output subsystems)

• Sync Bus (RJ45) connector for synchronizing acquisition on up to four DT9847 Series modules

• Requires use of an external +5 VDC to +24 VDC power supply

Page 17

Key Features of the DT9847-3-1

The key hardware features of the DT9847-3-1 module are as follows:

• Simultaneous analog input and analog output operations (continuous or waveform mode)

• Operates on external USB power

• Analog input subsystem:

 Three, simultaneous 24-bit A/D converters

 Throughput rate from 1 kSamples/s to 216 kSamples/s for simultaneous,

high-resolution measurements

 Input range of ±10 V with software-selectable gains of 1 and 10 for an effective input

range of ±10 V and ±1 V

 Support for IEPE (Integrated Electronic Piezoelectric) inputs, including use of a 4 mA

current source with 18 V compliance voltage for AC or DC coupling

 Supports a start trigger for acquiring pre-trigger samples and a reference trigger for

acquiring post-trigger samples. You can specify the number of post-trigger samples to acquire before stopping the operation.

Overview

 For the start trigger, supports a software-programmable trigger source (software,

 For the reference trigger, supports an external digital trigger or a positive- or

negative-going analog threshold trigger on any of the analog input channels. You can program the threshold value from –10 V to +10 V.

• Analog output subsystem:

 One 32-bit D/A converter

 Single value, waveform, and continuous streaming output

 Programmable output rate from 30 kSamples/s to 216 kSamples/s

 Output range of ±3 V or ±10 V, software programmable

 Software-programmable trigger source (software trigger or external digital trigger) to

start the analog output operation

• Internal clock source (shared between the analog input and analog output subsystems)

• Sync Bus (RJ45) connector for synchronizing acquisition on up to four DT9847 Series modules

• Requires use of an external +5 VDC to +24 VDC power supply

Page 18

Chapter 1

Supported Software

The DT Omni installer includes the following software for use with the DT9847 Series modules:

• DT9847 Series Device Driver – The DT9847 Series Device Driver allows you to use a DT9847 Series module with any of the supported software packages or utilities.

• DT9847 Series Calibration Utility – This utility, described in Chapter 8 starting on page

105, allows you to calibrate the analog input and analog output circuitry of a DT9847

Series module.

• QuickDAQ Base Version – The base version of QuickDAQ is free-of-charge and allows you to acquire and analyze data from all Data Translation USB and Ethernet devices, except the DT9841 Series, DT9817, DT9835, and DT9853/54. Using the base version of QuickDAQ, you can perform the following functions:

 Discover and select your devices.

 Configure all input channel settings for the attached sensors.

 Load/save multiple hardware configurations.

 Generate output stimuli (fixed waveforms, swept sine waves, or noise signals).

 On each supported data acquisition device, acquire data from all channels supported

in the input channel list.

 Choose to acquire data continuously or for a specified duration.

 Choose software or triggered acquisition.

 Log acquired data to disk in an .hpf file.

 Display acquired data during acquisition in either a digital display using the Channel

Display window or as a waveform in the Channel Plot window.

 Choose linear or logarithmic scaling for the horizontal and vertical axes.

 View statistics about the acquired data, including the minimum, maximum, and mean

values and the standard deviation in the Statistics window.

 Export time data to a .csv or .txt file; you can open the recorded data in Microsoft

Excel® for further analysis.

 Read a previously recorded .hpf data file.

 Customize many aspects of the acquisition, display, and recording functions to suit

your needs, including the acquisition duration, sampling frequency, trigger settings, filter type, and temperature units to use.

Page 19

• QuickDAQ FFT Analysis Option – When enabled with a purchased license key, the QuickDAQ FFT Analysis option includes all the features of the QuickDAQ Base version plus basic FFT analysis features, including the following:

 The ability to switch between the Data Logger time-based interface and the FFT

Analyzer block/average-based interface.

 Supports software, freerun, or triggered acquisition with accept and reject controls for

impact testing applications.

 Allows you to perform single-channel FFT (Fast Fourier Transform) operations,

including AutoSpectrum, Spectrum, and Power Spectral Density, on the acquired analog input data. You can configure a number of parameters for the FFT, including the FFT size, windowing type, averaging type, integration type, and so on.

 Allows you to display frequency-domain data as amplitude or phase.

 Supports dB or linear scaling with RMS (root mean squared), peak, and peak-to-peak

scaling options

 Supports linear or exponential averaging with RMS, vector, and peak hold averaging

options.

 Supports windowed time channels.

Overview

 Supports the following response window types: Hanning, Hamming, Bartlett,

Blackman, Blackman Harris, and Flat top.

 Supports the ability to lock the waveform output to the analysis frame time.

 Allows you to configure and view dynamic performance statistics, including the input

below full-scale (IBF), total harmonic distortion (THD), spurious free dynamic range (SFDR), signal-to-noise and distortion ratio (SINAD), signal-to-noise ratio (SNR), and the effective number of bits (ENOB), for selected time-domain channels in the Statistics window.

 Supports digital IIR (infinite impulse response) filters.

• QuickDAQ Advanced FFT Analysis Option – When enabled with a purchased software license, the QuickDAQ Advanced FFT Analysis option includes all the features of the QuickDAQ Base version with the FFT Analysis option plus advanced FFT analysis features, including the following:

 Allows you to designate a channel as a Reference or Response channel.

 Allows you to perform two-channel FFT analysis functions, including Frequency

Response Functions (Inertance, Mobility, Compliance, Apparent Mass, Impedance, Dynamic Stiffness, or custom FRF) with H1, H2, or H3 estimator types, Cross-Spectrum, Cross Power Spectral Density, Coherence, and Coherent Output Power.

 Supports the Exponential response window type.

 Supports the following reference window types: Hanning, Hamming, Bartlett,

Blackman, Blackman Harris, FlatTop, Exponential, Force, and Cosine Taper windows.

 Supports real, imaginary, and Nyquist display functions.

 Allows you to save data in the .uff file format.

Page 20

Chapter 1

• Quick DataAcq application –The Quick DataAcq application provides a quick way to get up and running using a DT9847 Series module. Using this application, you can verify key features of the modules, display data on the screen, and save data to disk. (Note that this application does not support configuring AC/DC coupling or the excitation current source for IEPE inputs.)

• DT-Open Layers for .NET Class Library – Use this class library if you want to use Visual C# or Visual Basic for .NET to develop your own application software for a DT9847 Series module using Visual Studio 2003-2012; the class library complies with the DT-Open Layers standard.

• DataAcq SDK – Use the Data Acq SDK if you want to use Visual Studio 6.0 and Microsoft C or C++ to develop your own application software for a DT9847 Series module using Windows Vista, Windows 7, or Windows 8; the DataAcq SDK complies with the DT-Open Layers standard.

• DAQ Adaptor for MATLAB – A link to the DAQ Adaptor for MATLAB is included from the DT Omni installer. Data Translation’s DAQ Adaptor provides an interface between the MATLAB Data Acquisition (DAQ) subsystem from The MathWorks and Data Translation’s DT-Open Layers architecture.

• LV-Link – A link to LV-Link is included from the DT Omni installer. Use LV-Link if you want to use the LabVIEW graphical programming language to access the capabilities of the DT9847 Series module.

Refer to the web site www.mccdaq.com for information about selecting the right software package for your needs.

Page 21

Supported Accessories

The following optional accessories are available for the DT9847 Series:

• STP15 screw terminal panel – A screw terminal panel that accepts digital input signals and an external trigger input signal and provides connections for digital output signals.

The 15-pin, 2-meter, EP337 cable is included with the STP15 screw terminal panel. The EP337 cable allows you to attach the STP15 screw terminal panel to the Digital I/O and External Trigger connector on a DT9847 Series module.

Figure 3 shows the STP15 and EP337 cable.

Overview

Figure 2: STP15 Screw Terminal Panel and EP337 Cable

Page 22

Chapter 1

• EP386 panel – The EP388 panel, shown in Figure 3, contains four RJ45 connectors that are wired in parallel, making it useful when attaching up to four DT9847 Series modules together using the Sync Bus connector. Refer to page 79 for more information on using this panel.

Figure 3: EP386 Panel

• BNC DIN Rail Kit – The BNC DIN Rail Kit, shown in Figure 4, allows you to mount USB modules that are packaged in metal boxes in a DIN rail. The kit includes mounting clips, screws, and instructions. The rail is not included.

Figure 4: BNC DIN Rail Kit

Page 23

Getting Started Procedure

Set Up and Install the Module

(see Chapter 2 starting on page 27)

Wire Signals

(see Chapter 3 starting on page 37)

Verify the Operation of the Module

(see Chapter 4 starting on page 47)

The flow diagram shown in Figure 5 illustrates the steps needed to get started using a DT9847 Series module. This diagram is repeated in each Getting Started chapter; the shaded area in the diagram shows you where you are in the getting started procedure.

Figure 5: Getting Started Flow Diagram

Overview

Page 24

Chapter 1

Page 25

Part 1: Getting Started

Page 26

Page 27

Setting Up and Installing the Module

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Applying Power to the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Attaching Modules to the Computer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Configuring the DT9847 Series Device Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Page 28

Chapter 2

Set Up and Install the Module

(this chapter)

Wire Signals

(see Chapter 3 starting on page 37)

Verify the Operation of the Module

(see Chapter 4 starting on page 47)

Page 29

Unpacking

Open the shipping box and verify that the following items are present:

• DT9847-1-1, DT9847-1-1-OEM, DT9847-2-2, DT9847-2-2-OEM, DT9847-3-1, or DT9847-3-1-OEM module

• If you ordered a DT9847-1-1 or DT98471-1-OEM module, the EP399 USB-Y cable is included. Optionally, you can use a +5 V external power supply (not included) to power the DT9847-1-1-OEM module.

• If you ordered a DT9847-2-2 or DT9847-3-1 module, the EP365 USB cable and EP394 +5 V external power supply are included.

• If you ordered a DT9847-2-2-OEM or DT9847-3-1-OEM module, the EP365 USB cable is included. To power the module, you must use a 5 V to 24 V external power supply (not included).

Setting Up and Installing the Module

CAUTION:

Ensure that the maximum voltage of the external supply is +5 V ±0.30 V. @ 600 mA. Higher voltages will destroy the DT9847-1-1-OEM module.

If an item is missing or damaged, contact Data Translation. If you are in the United States, call the Customer Service Department at (508) 956-5100. An application engineer will guide you through the appropriate steps for replacing missing or damaged items. If you are located outside the United States, call your local distributor (see www.mccdaq.com for more information).

Note: The DT9847 Series modules are factory-calibrated. If you decide that you want to recalibrate the analog input or analog output circuitry, refer to the instructions in Chapter 8.

Page 30

Chapter 2

System Requirements

For reliable operation, ensure that your computer meets the following system requirements:

• Processor: Pentium 4/M or equivalent

•RAM: 1 GB

• Screen Resolution: 1024 x 768 pixels

• Operating System: Windows 10, Windows 8, Windows 7, Windows Vista (32- and 64-bit)

• Disk Space: 4 GB

Page 31

Applying Power to the Module

To wall outlet

EP394 +5 V

Power

DT9847 Series Module

Ext. Power Connector

The DT9847-1-1 module runs on USB power and does not use an external power supply. The DT9847-2-2 and DT9847-3-1 modules require an external power supply and are shipped with an EP394 +5V power supply and cable.

Note: If you are using the OEM version of a DT9847 Series module, refer to Appendix C starting on page 133 for information on powering the module.

To apply power to the module, do the following:

1. Connect the EP394 +5 V power supply to the external power connector on the DT9847

Series module. Refer to Figure 6.

Setting Up and Installing the Module

Figure 6: Attaching a +5 V Power Supply to the DT9847 Series Module

2. Plug the power supply into a wall outlet.

Page 32

Chapter 2

Attaching Modules to the Computer

This section describes how to attach a DT9847 Series module to the host computer.

Note: Most computers have several USB ports that allow direct connection to USB devices. If your application requires more DT9847 Series modules than you have USB ports for, you can expand the number of USB devices attached to a single USB port by using expansion hubs. For more information, refer to page 34.

You can unplug a module, then plug it in again, if you wish, without causing damage. This process is called hot-swapping. Your application may take a few seconds to recognize a module once it is plugged back in.

The DT9847 Series modules use less than 500 mA; therefore, they do not require an external power supply.

You must install the device driver for your module before connecting the module(s) to the host computer. Run the DT Omni software to install the device driver and other software for the module.

Connecting Directly to the USB Ports

To connect a DT9847 Series module directly to a USB port on your computer, perform the following steps:

1. Attach one end of the USB cable to the USB port on the module and the other end to the

USB port on your host computer.

If you are using the DT9847-1-1, use the EP399 USB-Y cable to connect the module to two USB ports on the host computer, as shown in Figure 7.

Page 33

Setting Up and Installing the Module

DT9847-1-1 Module

USB Connector

Plug the USB B end of the USB-Y cable into the DT9847 Series module. Then, plug the two USB A ends of the cable into open USB ports on the computer.

This cable pulls power from both USB ports to power the module.

B end to

module

A ends to

host computer

EP399 USB-Y

Cable

Trigger LED

USB LED

Figure 7: Attaching the DT9847-1-1 Module to the Host Computer

Once the module is connected to the host computer, the operating system automatically detects the USB module and starts the Found New Hardware wizard.

2. For Windows Vista

a. Click Locate and install driver software (recommended).

The popup message "Windows needs your permission to continue" appears.

b. Click Continue.

The Windows Security dialog box appears.

c. Click Install this driver software anyway.

Note: Windows 7, Windows 8, and Windows 10 find the device automatically.

3. Repeat these steps to attach another DT9847 Series module to the host computer, if

desired.

Page 34

Chapter 2

USB Cable

Expansion Hubs

Host Computer

Power Supply

for Hub

USB-Y Cable

USB Cable

Power Supply

for Hub

DT9847-1-1

Module

DT9847-1-1

Module

Note: Once you have connected your module to the host computer, power is turned on to the module when your application program opens the module. The USB LED on the module turns green to indicate that power is turned on.

Power is turned off to the module when your application program terminates its connection to the module.

Connecting to an Expansion Hub

Expansion hubs are powered by their own external power supply. The practical number of DT9847 Series modules that you can connect to a single USB port depends on the throughput you want to achieve.

To connect multiple DT9847 Series modules to an expansion hub, do the following:

1. Attach one end of the USB cable to the module and the other end of the USB cable to an

expansion hub.

If you are using the DT9847-1-1, use the EP399 USB-Y cable to connect the module to two USB ports on the expansion hub, as shown in Figure 8.

2. Connect the power supply for the expansion hub to an external power supply.

3. Connect the expansion hub to the USB port on the host computer using another USB

Figure 8: Attaching Multiple DT9847-1-1 Modules Using Expansion Hubs

cable. Figure 9 shows how to attach DT9847-2-2 and DT9847-3-1 modules to an expansion hub.

The operating system automatically detects the USB module and starts the Found New Hardware wizard.

Page 35

Setting Up and Installing the Module

USB Cable

Expansion Hubs

Host Computer

Power Supply

for Hub

USB Cables

USB Cable

Power Supply

for Hub

Power Supply

for Module

*Note that each of these module requires

a +5 V external power supply (EP394).

DT9847-2-2 or

DT9847-3-1

Module

DT9847-2-2 or

DT9847-3-1

Module

DT9847-2-2 or

DT9847-3-1

Module

DT9847-2-2 or

DT9847-3-1

Module

Figure 9: Attaching Multiple DT9847-2-2 and DT9847-3-1 Modules Using Expansion Hubs

4. For Windows Vista

a. Click Locate and install driver software (recommended).

The popup message "Windows needs your permission to continue" appears.

b. Click Continue.

The Windows Security dialog box appears.

c. Click Install this driver software anyway.

Note: Windows 7, Windows 8, and Windows 10 find the device automatically.

5. Repeat these steps until you have attached the number of expansion hubs and modules

that you require.

The operating system automatically detects the USB devices as they are installed.

Note: Once you have connected your module to the host computer, power is turned on to the module when your application program opens a connection to the module. The LED on the module turns green to indicate that power is turned on.

Power is turned off to the module when your application program terminates its connection to the module.

Page 36

Chapter 2

Configuring the DT9847 Series Device Driver

Note: In Windows , you must have administrator privileges to run the Open Layers Control Panel. When you double-click the Open Layers Control Panel icon, you may see the Program Compatibility Assistant. If you do, select Open the control panel using recommended settings. You may also see a Windows message asking you if you want to run the Open Layers Control Panel as a "legacy CPL elevated." If you get this message, click Yes.

If you do not get this message and have trouble making changes in the Open Layers Control Panel, right click the DTOLCPL.CPL file and select Run as administrator. By default, this file is installed in the following location:

Windows (32-bit) C:\Windows\System32\Dtolcpl.cpl

Windows (64-bit) C:\Windows\SysWOW64\Dtolcpl.cpl

To configure the device driver for a DT9847 Series module, do the following:

1. If you have not already done so, power up the host computer and all peripherals.

2. From the Windows Start menu, select Settings|Control Panel.

3. From the Control Panel, double-click Open Layers Control Panel.

The Data Acquisition Control Panel dialog box appears.

4. If you want to rename the module, click the name of the module that you want to rename,

click Edit Name, enter a new name for the module, and then click OK. The name is used to identify the module in all subsequent applications.

5. Select the module that you want to configure, and then click Advanced.

The Measurement Options dialog box appears.

6. For the Coupling type, select AC for AC coupling or DC for DC coupling for each analog

input channel.

7. For the Current Source, select Enabled to enable the internal excitation current source or

Disabled to disable the internal excitation current source for each analog input channel.

Note: If you enable the use of the internal excitation current source, it is recommended

that you choose AC coupling. Refer to page 40 for more information on wiring IEPE inputs.

8. When you are finished, click OK to close the Measurement Options dialog box.

9. Repeat steps 4 to 8 for the other modules that you want to configure.

10. When you are finished configuring the modules, click Close to close the Control Panel.

Page 37

Wiring Signals

Preparing to Wire Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Connecting Analog Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Connecting an Analog Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Connecting Digital I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Page 38

Chapter 3

Set Up and Install the Module

(see Chapter 2 starting on page 27)

Wire Signals

(this chapter)

Verify the Operation of the Module

(see Chapter 4 starting on page 47)

Page 39

Preparing to Wire Signals

Analog Input 0

Analog Output 0 Digital I/O and External Trigger Connector

Analog Input 1

Analog Input 2 or Analog Output 1 on the DT9847-2-2

This section provides recommendations and information about wiring signals to a DT9847 Series module.

Wiring Recommendations

Keep the following recommendations in mind when wiring signals to a DT9847 Series module:

• Follow standard ESD procedures when wiring signals to the module.

• Separate power and signal lines by using physically different wiring paths or conduits.

• To avoid noise, do not locate the module and cabling next to sources that produce high electromagnetic fields, such as large electric motors, power lines, solenoids, and electric arcs, unless the signals are enclosed in a mumetal shield.

• Prevent electrostatic discharge to the I/O while the module is operational.

• Connect all unused analog input channels to analog ground.

Wiring Signals

Warm-Up Time

The DT9847 Series is ideal for acoustic measurements due to its AC coupling and frequency characteristics. It is not designed for DC stability; therefore, ensure that you allow the module to warm up for 15 minutes before use.

Wiring Signals to the Module

Figure 10 shows the connectors on the DT9847-3-1 module. Note that the DT9847 has only one

analog input connector and one analog output connector, while the DT9847-2-2 has two analog input connectors and two analog output connectors, and the DT9847-3-1 has three analog input connectors and one analog output connector. The remaining sections of this chapter describe how to attach signals to these connectors.

Figure 10: Connectors on the DT9847 Series Module

Page 40

Chapter 3

Signal

Source

Analog Input 0

Connecting Analog Input Signals

For the DT9847-1-1 module, you can connect one analog input signal (or IEPE sensor) to the BNC connector on the module. For the DT9847-2-2 module, you can connect up to two analog input signals (or IEPE sensors) to the BNC connectors on the module. For the DT9847-3-1 module, you can connect up to three analog input signals (or IEPE sensors) to the BNC connectors on the module. Internally, these signals are connected in single-ended mode. The DT9847 Series modules support an input signal range of ±10 V (using a gain of 1) or ±1 V (using a gain of 10).

Note: If you enable the use of the internal excitation current source for IEPE inputs, it is recommended that you choose AC coupling. Refer to page 64 for more information on IEPE inputs.

Figure 11 shows how to connect an analog input signal (channel 0, in this case) to a BNC

connector on the DT9847 Series module.

Figure 11: Connecting Analog Inputs to a DT9847 Series Module

Page 41

Connecting an Analog Output Signal

Note that the connector automatically connects the Analog Ground signal

Load

Analog Out 0

DT9847-1-1 or DT9847-3-1

Module

The DT9847-1-1 and DT9847-3-1 modules provide one analog output channel. The DT9847-2-2 modules provides two analog input channels. The output channels have an output range of ±3 V.

Figure 12 shows how to connect an analog output signal to the DT9847-1-1 or DT9847-3-1

module.

Wiring Signals

Figure 12: Connecting an Analog Output Signal to the DT9847-1-1 or DT98473-1 Module

Figure 13 shows how to connect analog output signals to the DT9847-2-1 module.

Page 42

Chapter 3

Note that the connectors automatically connect the Analog Ground signal appropriately.

Load

Analog Out 0

DT9847-2-2 Module

Analog Out 1

Figure 13: Connecting Analog Output Signals to the DT9847-2-2 Module

Page 43

Connecting Digital I/O Signals

1115

610

EP337

STP15

DT9847 Series

Module

Digital I/O and External

Trigger Connector

Figure 14 shows the layout of the 15-pin Digital I/O and External Trigger connector on the

DT9847 Series modules.

Figure 14: Layout of the Digital I/O and External Trigger Connector

To make wiring easier, connect the STP15 screw terminal panel to the Digital I/O and External Trigger connector on the DT9847 module as shown in Figure 15.

Wiring Signals

Figure 15: Connecting the STP15 to the DT9847 Series Module

The STP15 contains one 15-pin connector and two screw terminal blocks (TB1 and TB2). The 15-pin connector provides access to the signals from the Digital I/O and External Trigger connector on the DT9847 module. Figure 16 shows the layout of the STP15 and lists the screw terminal assignments.

Page 44

Chapter 3

J1, 15-Pin Connector

IN0

TB1

IN1

DGND

IN2

IN3

DGND

STROBE*

DGND

TB2

+5 V*

DGND

OUT3

OUT2

DGND

OUT1

OUT0

*These signal are not used on the DT9847 Series modules.

DGND/ TRIGGER

Digital Input 0

IN0

Digital Input 1

Digital Ground

TTL Inputs

IN1

STP15, TB1

DGND

Figure 16: Layout of the STP15 Screw Terminal Panel

IN refers to digital input signals, OUT refers to digital output signals, DGND refers to digital ground signals, and TRIGGER refers to the external trigger signal. STROBE and +5 V are not used on the DT9847 Series modules.

Figure 17 shows how to connect digital input signals (lines 0 and 1, in this case) to terminal

block TB1 of the STP15 screw terminal panel.

Figure 17: Connecting Digital Inputs to the STP15 Screw Terminal Panel

Page 45

Wiring Signals

Digital Out 0

Digital Ground

DGND

OUT0

STP15, TB2

500

1 Out = LED On

From

DT9847

100

The output current is determined using the following equation:

In this example, if the maximum output voltage is 3.3 V, the internal resistor is 100

 and the external resistor is 500 , the maximum output current is

5.5 mA. Using the minimum output voltage of 2.0 V with the same resistor values, the minimum current output current is 3.3 mA

Current

Out

Voltage

Out

InternalRExternal

-----------------------------------------------------------=

Figure 18 shows how to connect a digital output (line 0, in this case) to terminal block TB2 of

the STP15 screw terminal panel.

Figure 18: Connecting Digital Outputs to the STP15 Screw Terminal Panel

Page 46

Chapter 3

Page 47

Verifying the Operation of a Module

Select the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Acquire Data from an Analog Output Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Page 48

Chapter 4

Set Up and Install the Module

(see Chapter 2 starting on page 27)

Wire Signals

(see Chapter 3 starting on page 37)

Verify the Operation of the Module

(this chapter)

You can verify the operation of a DT9847 Series module using the QuickDAQ application.

QuickDAQ allows you to acquire and analyze data from all Data Translation USB and Ethernet devices, except the DT9841 Series, DT9817, DT9835, and DT9853/54. This chapter describes how to verify the operation of a DT9847 Series module using the QuickDAQ base version.

Page 49

Select the Device

To get started with your DT9847 Series module and the QuickDAQ application, follow these steps:

1. Connect the DT9847 Series module to the USB port of your computer, and connect your

sensors to the module.

2. Start the QuickDAQ application.

The Device Selection window appears.

Verifying the Operation of a Module

3. For the Device Family selection, select OpenLayersDevices.

By default, the application "discovers" all devices that are available for the specified device family and displays the module name for the USB devices in the drop-down list. If you want to refresh this list to determine if other devices are available, click Refresh.

4. Select the module name for the DT9847 Series module that you want to use from the list of

Available Devices, and click Add.

Information about the device, including the model number, serial number, firmware version, driver version, and scanning status is displayed.

Page 50

Chapter 4

5. If you want to rename your device, do the following:

a. Click the Row Selector button for the device.

b. Click the IP address or module name in the Name column to highlight it and enter a

meaningful name to represent each available device.

6. If you are using multiple devices, you must configure one device as the clock and trigger

master, as follows:

a. Click the Row Selector button for the device that you want to be the clock and trigger

master.

b. For the clock and trigger master device, check the box under the Master column.

Note: Only one device can be the clock and trigger master. If you are using a single

device, the application automatically configures the device as the master.

DT9847 Series modules support that capability of synchronizing up to four devices. If you are using more than one of these devices, ensure that you connect the devices together using network cables and the Sync Bus (RJ45) connector on each device. Then, configure one device as the master and the other devices as slaves. The software automatically drives out the appropriate clock and trigger signals. Refer to page 79 for more information on synchronizing devices.

7. (Optional) If you want to remove a device from list of selected devices, click the Row

Selector button for the device, and then click Remove.

8. Once you have added all the devices that you want to use with the application, click OK.

The latest state is saved and used when the application is next run, and the interface of the QuickDAQ application is displayed.

Page 51

Verifying the Operation of a Module

Page 52

Chapter 4

Acquire Data from an Analog Output Channel

The following steps describe how to use the QuickDAQ application to monitor the output of the analog output signal using an analog input channel.

In this example, a 3 V sine wave is output on analog output channel 0 of a DT9847-1-1 module. The analog output channel is connected to analog input channel 0 on the DT9847-1-1 module.

Configure the Analog Output Settings

For this example, configure the analog output channel as follows:

1. Click the Output tab of the Acquisition and Config window.

Page 53

2. Select the Enable checkbox to enable the analog output channel on the module.

3. For the Waveform type, select Fixed.

4. For Peak Voltage, enter 3 to output a ±3 V signal.

5. For Offset, enter 0.

6. For Signal Type, select Sine to output a sine wave.

7. For Output Mode, select Continuous to output a waveform that repeats continuously.

8. For Frequency, select 10 Hz; this is the frequency of the output waveform.

9. For Ramp Up Time, enter 0.

10. For the Start/Stop Method, select With Acquisition.

The analog output operation will start when you start acquisition.

11. If desired, hide the Acquisition Config window by clicking the Auto-Hide pin ( ) in

the top, right corner of the window.

Configure the Analog Input Channel

Configure the analog input channel as follows:

Verifying the Operation of a Module

1. Ensure that the output from analog output channel 0 is connected to the input of analog

input channel 0.

2. Configure the analog input channel by clicking the Input Channel Configuration toolbar

button ( ) or by clicking the Configuration menu and clicking Input Channel

Configuration.

3. Enable analog input channel 0 by clicking the Enable checkbox next to the channel.

4. Under the Channel Name column, leave the default channel name as Ain 0.

5. Under the Range column, select the input range for analog input channel.

In this example, ±10 V is used.

6. Under the Coupling column, select the coupling type (AC or DC) for your sensor.

Since this example is monitoring a voltage input, DC is used.

Page 54

Chapter 4

7. Under the Current Source column, select whether to enable or disable use of the 4 mA

current source on the data acquisition device.

Since this example is monitoring a voltage input, the Current Source checkbox is not checked (disabled) for the analog input channel.

8. Under the Engineering Units column, select the engineering units for the input.

In this example, V is used.

9. Enter the number of mV per engineering unit in the mV/EU field.

In this example, 1000 is used.

10. If an offset is specified for the input, enter the value in the EU Offset field.

In this example, no offset (0) is specified.

11. If desired, enter a test point value for the channel.

In this example, 0 is used.

12. If desired, enter a sensor direction for each channel.

In this example, Scalar is used.

13. Click Close to close the Configure Devices dialog box.

Page 55

Configure the Recording Settings

For this example, configure the recording settings as follows:

1. Click the Recording tab of the Acquisition Config window.

Verifying the Operation of a Module

2. For Filename generation, use the default Filename option.

3. For Filename, use the default name for the data file.

4. Leave the Enable Continuous Acquisition checkbox unchecked.

5. For Acquisition Duration, select 1 second.

The number of seconds for the total run and the amount of available disk space are shown.

6. For X Span Axis, select 1 second.

Page 56

Chapter 4

Configure the Acquisition Settings

For this example, configure the acquisition settings as follows:

1. Click the Acquisition tab of the Acquisition Config window.

2. For the Per Channel Sampling Frequency text box, enter 2000.

The application snaps the value to closest sampling frequency. The sampling rate, sample interval, and number of scans are displayed.

3. For the Trigger Source check box, select Software to ensure that the measurement starts

as soon as the Record button is clicked.

Page 57

Start the Operation

Once you have configured the channels and the application parameters, click the Record toolbar button ( ) or press the F5 key to start the operation.

Results similar to the following are displayed in the Channel Plot window, showing the output of analog output channel 0 as measured by analog input channel 0.

Verifying the Operation of a Module

Note: Many additional options are provided in QuickDAQ for measuring and analyzing the data. Refer to the QuickDAQ User’s Manual for detailed information.

Page 58

Chapter 4

Page 59

Part 2: Using Your Module

Page 60

Page 61

Principles of Operation

Analog Input Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Analog Output Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Digital I/O Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Triggering Acquisition on Multiple Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Synchronizing Acquisition on Multiple DT9847 Series Modules . . . . . . . . . . . . . . . . . . . . . 79

Page 62

Chapter 5

Ext. Trigger

Ain 0

24-Bit

A/D

4 mA

+18 Volts

1 M

x1 / 10

AC - DC

Coupling

USB 2.0

High Speed

Interface

USB 2.0

A/D PLL

Programmable

Clock

32-Bit D/A

Converter

100 kHz

Filter

15-pin

Connector

Digital In

Digital Out

D/A PLL

Programmable

Clock

Control Logic

Sync Bus Clock &

Trigger

RJ45

D/A Output 0

Ext. Trigger

Ain 0

24-Bit

A/D

4 mA

+18 Volts

1 M

x1 / 10

AC - DC

Coupling

USB 2.0

High Speed

Interface

USB 2.0

A/D PLL

Programmable

Clock

32-Bit D/A

Converter

100 kHz

Filter

15-pin

Connector

Digital In

Digital Out

D/A PLL

Programmable

Clock

Control Logic RJ45

24-Bit

A/D

4 mA

+18 Volts

1 M

x1 / 10

AC - DC

Coupling

Ain 1

32-Bit D/A Converter

100 kHz

Filter

D/A Output 1

Figure 19 shows a block diagram of the DT9847-1-1 module.

Figure 19: Block Diagram of the DT9847-1-1 Module

Figure 20 shows a block diagram of a DT9847-2-2 module.

Figure 20: Block Diagram of the DT9847-2-2 Module

Page 63

Figure 21 shows a block diagram of the DT9847-3-1 module.

D/A Output 0

Ext. Trigger

Ain 0

24-Bit

A/D

4 mA

+18 Volts

1 M

x1 / 10

AC - DC

Coupling

USB 2.0

High Speed

Interface

USB 2.0

A/D PLL

Programmable

Clock

32-Bit D/A Converter

100 kHz

Filter

15-pin

Connector

Digital In

Digital Out

D/A PLL

Programmable

Clock

Control Logic

Sync Bus Clock &

Trigger

RJ45

24-Bit

A/D

4 mA

+18 Volts

1 M

x1 / 10

AC - DC

Coupling

24-Bit

A/D

4 mA

+18 Volts

1 M

x1 / 10

AC - DC

Coupling

Ain 1

Ain 2

Principles of Operation

Figure 21: Block Diagram of the DT9847-3-1 Module

Page 64

Chapter 5

Analog Input Features

This section describes the following features of analog input (A/D) subsystem on the DT9847 Series modules:

• Analog input channels, described on this page

• IEPE functions, described on page 65

• Input resolution, described on page 65

• Input ranges and gains, described on page 64

• Input sample clock sources, described on page 65

• Analog input conversion modes, described on page 66

• Input triggers, described on page 69

• Data format and transfer, described on page 71

• Error conditions, described on page 71

Analog Input Channels

The DT9847-1-1 module provides one analog input channel (channel 0), the DT9847-2-2 provides two analog input channels (channels 0 and 1), and the DT9847-3-1 provides three analog input channels (channels 0 to 2). These are signal-ended channels; you can connect IEPE sensors to these inputs, if desired; refer to page 65 for more information on IEPE functions.

Note: To maintain simultaneous operation, all analog input connections on the DT9847 Series modules must have the same lead lengths.

The DT9847 Series modules use Delta-Sigma analog-to-digital converters (ADCs) that provide anti-aliasing filters based on the clock rate. These filters remove aliasing, which is a condition where high frequency input components erroneously appear as lower frequencies after sampling.

Using software, you can acquire a single value from a single analog input channel, a single value from all the analog input channels simultaneously (for the DT9847-2-2 and DT9847-3-1), or multiple values from a one or more analog input channels. Refer to “Analog Input

Conversion Modes” on page 66 for more information on specifying and reading data from

these channels.

Input Ranges and Gains

The DT9847 Series modules provide an input range of ±10 V and software-selectable gains of 1 and 10. This provides effective input ranges of ±10 V (when the gain is 1) and ±1 V (when the gain is 10).

Page 65

IEPE Functions

Applications that require accelerometer, vibration, noise, or sonar measurements often use

IEPE sens

modules. The modules support the following software-programmable IEPE functions for each analog input channel:

• Excitation current source – The DT9847 Series modules provide an internal excitation

• Coupling type – You can select whether AC coupling or DC coupling is used. By default,

For information on wiring IEPE inputs, refer to page 40.

Note: If you enable the use of the internal excitation current source, it is recommended that you choose AC coupling.

ors. IEPE conditioning is built-in to the analog input circuitry of the DT9847 Series

current source of 4 mA. You can enable or disable the use of a internal excitation current source using software. By default, the excitation current source is disabled.

DC coupling is selected for the DT9847 Series modules.

Principles of Operation

Input Resolution

The resolution of the analog input channels is fixed at 24 bits; you cannot specify the resolution in software.

Input Clock Source

The DT9847 Series modules support a 48 MHz internal clock source, which is derived from the 24 MHz USB crystal oscillator. The same internal 48 MHz clock signal is used for the both the analog input and analog output subsystems.

For the analog input subsystem, use software to specify the internal clock source and the frequency at which to pace the input operations and to start the sample clock. The sampling frequency ranges from 1 kHz to 216 kHz.

Note: According to sampling theory (Nyquist Theorem), specify a frequency that is at least twice as fast as the input’s highest frequency component. For example, to accurately sample a 20 kHz signal, specify a sampling frequency of at least 40 kHz to avoid aliasing.

The sample frequencies for the A/D and D/A subsystems are independently programmable and are derived from the same 48 MHz reference clock. Therefore, it is possible to establish a fixed relationship between the A/D and D/A subsystem sample frequencies, including setting them to the same frequency (30 kHz to 216 kHz). However, the subsystems are not designed to be synchronous with each other.

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Chapter 5

Once the sample clock is started, the module requires 63 conversions before the first A/D sample is valid. The valid sample is aligned with the A/D trigger.

On the DT9847 Series, the sampling frequency is generated by a programmable clock chip rather than a divider off the reference clock for better flexibility and accuracy.

Configuration Delay

Due to the design of the A/D converter on the DT9847 Series, you may notice a delay after you configure the sampling frequency on the module (when the Config command is called). The delay is more significant at slower sampling frequencies.

The configuration delay is determined as follows:

•Sampling rate 50 kHz:

Configuration delay = 8719 Samples/Sampling rate

•Sampling rate 100 kHz:

Configuration delay = 17423 Samples/Sampling rate

•Sampling rate 216 kHz:

Configuration delay = 34831 Samples/Sampling rate

For example, if you specify a sampling frequency of 1 kHz (sampling rate is 1 kSamples/s), the delay after you configure the sampling rate is 8.719 s, determined as follows:

8719 Samples/1 kSamples/s = 8.719 s

Similarly, if you specify a sampling frequency of 216 kHz (sampling rate is 216 kSamples/s), the delay after you configure the sampling rate is 0.161 s, determined as follows:

34831 Samples/216 kSamples/s = 0.161 s

Analog Input Conversion Modes

DT9847 Series modules support single-value, single-values, and continuous scan conversion modes. This section describes each of these conversion modes.

Single-Value Operations

Single-value operations are simpler to use than continuous operations. Using software, you specify the analog input channel and the gain that you want to use. For the DT9847-1-1, specify channel 0; for the DT9847-2-2, specify channel 0 or 1; for the DT9847-3-1, specify channel 0, 1, or 2. The module acquires the data from the specified channel and returns the data immediately.

For single-value operations, you cannot specify a clock source, trigger source, scan mode, or buffer. Single-value operations stop automatically when finished; you cannot stop a single-value operation.

Page 67

Principles of Operation

Single-Values Operations

For the DT9847-2-2 or DT9847-3-1 module, you may prefer to read a single value from all the analog input channels simultaneously using one software call. This is called a single-values operation. You specify the analog input subsystem and the gain that you want to use for the channels (not the channels themselves). The module then acquires a value from each input channel simultaneously; the data is returned as an array of input values.

For single-values operations, you cannot specify a clock source, trigger source, scan mode, or buffer. Single-values operations stop automatically when finished; you cannot stop a single-values operation.

Continuous Scan Mode

Continuous scan mode takes full advantage of the capabilities of the DT9847 Series modules. You can specify a channel list, clock source, start trigger, reference trigger, post-trigger scan count, and buffer using software.

On the DT9847-1-1 module, you can enter up to one entry in the channel list (analog input channel 0). On the DT9847-2-2 module, you can enter up to two entries in the channel list (analog input channels 0 and 1). On the DT9847-3-1 module, you can enter up to three entries in the channel list (analog input channels 0 to 2). Using software, specify the channels you want to sample in sequential order.

When it detects the start trigger, the module samples all the channels in the list simultaneously.

If a reference trigger is not specified, data that is acquired after the start trigger is post-trigger data. The sampled data is placed in the allocated buffer(s). The operation continues until you stop it or until no more buffers are available.

If a reference trigger is specified, data that is acquired after the start trigger is pre-trigger data; when the reference trigger occurs, pre-trigger data acquisition stops and post-trigger acquisition starts at the next sample. The sampled data is placed in the allocated buffer(s). The operation continues until the number of scans that you specify for the post-trigger scan count have been acquired; at the point, the operation stops. Note that the sample at which the trigger occurs is not counted as a post-trigger sample. Refer to page 69 for more information about triggers.

The conversion rate is determined by the frequency of the input sample clock; refer to page 65 for more information about the input sample clock.

Using software, you can stop a scan by performing either an orderly stop or an abrupt stop. In an orderly stop, the module finishes acquiring the current buffer, stops all subsequent acquisition, and transfers the acquired data to host memory; any subsequent triggers are ignored. In an abrupt stop, the module stops acquiring samples immediately; the current buffer is not completely filled, it is returned to the application only partially filled, and any subsequent triggers are ignored.

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Chapter 5

Chan 0

Chan 1

Chan 2

Input

Sample

Clock

Chan 0

Chan 1

Chan 2

Chan 0

Chan 1

Chan 2

Chan 0

Chan 1

Chan 2

Start Trigger occurs

Reference Trigger occurs

3 Post-trigger samples acquired

Pre-trigger data acquired

Chan 0

Chan 1

Chan 2

Post-Trigger Scan Count = 3

Chan 0

Chan 1

Chan 2

Trigger Sample is not counted

as post-trigger sample

To select continuous scan mode, use software to specify the following parameters:

• Specify the data flow as Continuous

• Specify the clock source as internal and specify the clock frequency (refer to page 65)

• Specify the start trigger (refer to page 69)

• Specify the reference trigger (refer to page 70)

• Specify the post-trigger scan count (the number of post-trigger samples to acquire after the reference trigger occurs)

Figure 22 illustrates continuous scan mode (using a start and reference trigger) with a channel

list of three entries: channel 0 through channel 2. In this example, pre-trigger analog input data is acquired when the start trigger is detected. When the reference trigger occurs, the specified number of post-trigger samples (3, in this example) are acquired.

Figure 22: Continuous Scan Mode on the DT9847 Series Modules

Using a Start and Reference Trigger

Note: The USB LED, shown in Figure 34 on page 132, blinks amber while the module is acquiring data.

The Trigger LED on the module, shown in Figure 34 on page 132, is green when the module is waiting for an external digital trigger, threshold trigger, or Sync Bus trigger (the module must have been configured for one of these trigger types), green when the module has been triggered, or off when the module is idle.

Page 69

Input Triggers

A trigger is an event that occurs based on a specified set of conditions.

On the DT9847 Series modules, you can specify a start trigger source and a reference trigger source. Pre-trigger data acquisition starts when the start trigger event occurs. When the reference trigger event occurs, pre-trigger data acquisition stops and post-trigger acquisition starts. Post-trigger acquisition stops when the number of samples you specify for the post-trigger scan count has been reached. Refer to page 67 for more information.

The Trigger LED on the module, shown in Figure 34 on page 132, is green when the module is waiting for an external digital trigger, threshold trigger, or Sync Bus trigger (the module must have been configured for one of these trigger types), red when the module has been triggered, or off when the module is idle.

Start Trigger Sources

The DT9847 Series modules support the following sources for the start trigger:

• Software trigger – A software trigger event occurs when you start the analog input operation (the computer issues a write to the module to begin conversions). Using software, specify the start trigger source as a software trigger.

Principles of Operation

• External digital (TTL) trigger – An external digital (TTL) trigger event occurs when the module detects a rising- or falling-edge transition on the signal connected to the External Trigger pin (pin 13) of the Digital I/O and External Trigger connector on the module. Using software, specify the trigger source as an external, positive digital (TTL) trigger to detect the trigger on the rising edge or an external, negative digital (TTL) trigger to detect the trigger on the falling edge.

Note: If you configure the synchronization mode as slave, the Sync Bus connector accepts trigger and clock signals from the master; you cannot use the Ext Trig connector on the slave module. Refer to page 79 for more information.

• Analog threshold trigger – The start trigger event occurs when the signal attached to a specified analog input channel in the channel list rises above or falls below a user-specified threshold value. Using software, specify the following parameters:

 Start trigger source – Specify a positive (low-to-high transition) threshold trigger if you

want to trigger when the signal rises above a threshold level, or a negative (high-to-low transition) threshold trigger if you want to trigger when the signal falls below a threshold level.

 Threshold channel – Specify any one of the analog input channels that are included in

the channel list as the threshold input channel.

 Threshold level – Specify a value between ±10 V for a gain of 1 or ±1 V for a gain of 10

as the threshold level.

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Note: If you choose a threshold trigger as both the start trigger and the reference trigger, the threshold channel and threshold level must be the same. The polarity of the trigger (positive or negative going) can be different for each trigger source.

• Sync Bus trigger – When multiple DT9847 Series modules (or multiple DT9847 Series and DT9837 Series or DT9838 modules) are connected together using the Sync Bus (RJ45) connector, you can use the Sync Bus trigger as the start trigger of the slave module by setting the synchronization mode of module to Slave. In this configuration, any other start trigger for the slave module is ignored. Refer to page 79 for more information on this configuration.

Reference Trigger Sources

The DT9847 Series modules support the following sources for the reference trigger:

• External digital (TTL) trigger – The reference trigger event occurs when the module detects a rising- or falling-edge transition on the signal connected to the External Trigger pin (pin 13) of the Digital I/O and External Trigger connector on the module. Using software, specify the reference trigger source as an external, positive digital (TTL) trigger to detect the trigger on the rising edge or an external, negative digital (TTL) trigger to detect the trigger on the falling edge.

• Analog threshold trigger –The reference trigger event occurs when the signal attached to a specified analog input channel in the channel list rises above or falls below a user-specified threshold value. Using software, specify the following parameters:

 Reference trigger source – Specify a positive (low-to-high transition) threshold trigger

if you want to trigger when the signal rises above a threshold level, or a negative (high-to-low transition) threshold trigger if you want to trigger when the signal falls below a threshold level.

 Threshold channel – Specify any one of the analog input channels that are included in

the channel list as the threshold input channel.

 Threshold level – Specify a value between ±10 V for a gain of 1 or ±1 V for a gain of 10

as the threshold level.

• Sync Bus trigger – When multiple DT9847 Series modules (or multiple DT9847 Series and DT9837 Series or DT9838 modules) are connected together using the Sync Bus (RJ45) connector, you can set the reference trigger of a slave DT9847 Series module to Sync Bus if you want to receive a Sync Bus trigger from one of the other modules to stop pre-trigger acquisition and start post-trigger acquisition. Refer to page 79 for more information on this configuration.

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Data Format and Transfer

DT9847 Series modules use offset binary data encoding, where 000000 represents negative full-scale, and FFFFFFh represents positive full-scale. Use software to specify the data encoding as binary. The ADC outputs FFFFFFh for above-range signals, and 000000 for below-range signals.

Before you begin acquiring data, you must allocate buffers to hold the data. A Buffer Done event is returned whenever a buffer is filled. This allows you to move and/or process the data as needed.

We recommend that you allocate a minimum of two buffers for continuous analog input operations. Data is written to multiple allocated input buffers continuously; when no more empty buffers are available, the operation stops. The data is gap-free.

Note: DT9847 Series modules have an 8 kSample input FIFO that is used to store the acquired data before it is sent to the host.

Principles of Operation

Error Conditions

DT9847 Series modules report any overrun errors by sending an overrun event to the application program. This event indicates that data buffers are not being sent from the module to the host fast enough, and the A/D converter ran out of buffers. To avoid this error, try one or more of the following:

• Reduce the clock rate of the A/D

• Increase the size of the buffers

• Increase the number of buffers

• Close any other applications that are running

• Run the program on a faster computer

If one of these error conditions occurs, the module stops acquiring and transferring data to the host computer.

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Analog Output Features

This section describes the following features of analog output operations:

• Analog output channels, described below

• Output ranges and gains, described below

• Output resolution, described below

• Output clocks, described below

• Output conversion mode, described on page 73

• Output triggers, described on page 75

• Data format and transfer, described on page 76

• Error conditions, described on page 76

Analog Output Channels

The DT9847-1-1 and DT9847-3-1 modules support one analog output channel (0) through analog output subsystem 0. The DT9847-2-2 module supports two analog output channels (0 and 1) through analog output subsystem 0.

The DT9847 Series modules provide a two-pole, 250 kHz Butterworth filter to prevent noise from interfering with the output signal.

The analog output channel powers up to a value of 0 V ±10 mV.

Output Ranges and Gains

The DT9847 Series modules can output bipolar analog output signals in the range of ±3 V or ±10 V. The output range is software programmable. The gain is 1.

Note: Older versions of the module may support only the ±3 V range.

Output Resolution

The resolution of the analog output channel is fixed at 32-bits; you cannot specify the resolution in software.

Output Clocks

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For the analog output subsystem, use software to specify the internal clock source and the output frequency. The output frequency can range between 30 kHz and 216 kHz.

Note: The sample frequencies for the A/D and D/A subsystems are independently programmable and are derived from the same 48 MHz reference clock. Therefore, it is possible to establish a fixed relationship betwen the A/D and D/A subsystem sample frequencies, including setting them to the same frequency (30 kHz to 216 kHz). However, the subsystems are not designed to be synchronous with each other.

Due to the group delay of the Delta-Sigma D/A converter, the DT9847 Series modules require 36 clock pulses once the analog output sample clock is started before the first D/A conversion is completed.

Output Conversion Modes

The DT9847 Series modules support single-value, waveform, and continuous analog output operations.

Principles of Operation

Single-Value Mode

Single-value mode is the simplest to use but offers the least flexibility and efficiency. Use software to specify the analog output channel that you want to update, and the value to output from that channel. The value is output from the specified channel immediately.

For a single-value operation, you cannot specify a clock source, trigger source, or buffer. Single-value operations stop automatically when finished; you cannot stop a single-value operation.

Waveform Generation Mode

Waveform generation mode is supported on the DT9847 Series modules. In this mode, a waveform, which is specified in a single buffer, is output repetitively. The waveform pattern can range from 2 to 8192 samples if you are using one analog output channel or from 2 to 4096 if you are using two analog output channels. Use software to fill the output buffer with the values that you want to write to the channels in the output channel list.

Note: If you are using the DataAcq SDK, you must specify the data in a particular order. For example, if your output channel list contains analog output channels 0 and 1, specify the values in the output buffer as follows: the first output value for analog output channel 0, the first output value for analog output channel 1, the second output value for analog output channel 0, the second output value for analog output channel 1, and so on.

This is not required in the DT-Open Layers for .NET Class Library.

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The host computer transfers the entire waveform pattern to the 8 kSample output FIFO on the module. When it detects a software trigger, the module starts writing output values to the analog output channels at the specified clock rate. The module recycles the data, allowing you to output the same pattern continuously without any further CPU or USB bus activity.

When it reaches the end of the FIFO, the module returns to the first location of the FIFO and continues outputting the data. This process continues indefinitely until you stop it.

To select waveform generation mode, use software to specify the following parameters:

• Specify the data flow as Continuous

• Specify WrapSingleBuffer as True to use a single buffer

• Specify the clock source as internal and specify the clock frequency. Refer to page 72 for more information about the clock source and frequency.

• Specify a software trigger source, described in the next section

The DT9847 Series hardware supports the ability to mute the output voltage to 0 V. Muting the output does not stop the analog output operation; instead, the analog output voltage is reduced to 0 V over 1020 samples. When desired, you can use unmute the output voltage to its current level. Refer to your software documentation for more information on muting and unmuting the output voltage.

Continuous Analog Output Operations

Use continuously paced analog output mode to continuously output buffered values to the analog output channel at a specified clock frequency. The DT9847 Series modules support the ability to start continuous analog output operations and continuous analog input operations simultaneously.

This is not required in the DT-Open Layers for .NET Class Library.

When it detects a trigger, the module starts writing the values from the output buffer to the channels specified in the output channel list at the specified clock frequency. The operation repeats continuously until all the data is output from the buffers or you stop the operation.

Note: Make sure that the host computer transfers data to the output channel list fast enough so that the list does not empty completely; otherwise, an underrun error results.

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Principles of Operation

To select continuously paced analog output mode, use software to specify the following parameters:

• Specify the data flow as Continuous

• Specify WrapSingleBuffer as False to use multiple buffers

• Specify the clock source as internal and specify the clock frequency. Refer to page 72 for more information about the clock source and frequency.

• Specify the trigger source as any of the supported trigger sources. Refer to page 75 for more information about the supported trigger sources.

• To start the analog input and analog output operations simultaneously using the DT-Open Layers for .NET Class Library, use the SimultaneousStart.AddSubsystem, SimultaneousStart.PreStart, and SimultaneousStart.Start methods. Refer to the documentation for the DT-Open Layers for .NET Class Library for more information.

We recommend that you allocate a minimum of two buffers for a continuously paced analog output operation. Data is written from multiple output buffers continuously; when no more buffers of data are available, the operation stops. The data is gap-free.

Note: The USB LED, shown in Figure 34 on page 132, blinks amber while the module is streaming the data to the analog output channels in continuous mode.

To stop a continuously paced analog output operation, you can stop queuing buffers for the analog output system, letting the module stop when it runs out of data, or you can perform either an orderly stop or an abrupt stop using software. In an orderly stop, the module finishes outputting the specified number of samples, and then stops; all subsequent triggers are ignored. In an abrupt stop, the module stops outputting samples immediately; all subsequent triggers are ignored.

Output Trigger

The DT9847 Series modules support the following trigger sources for starting analog output operations:

• Software trigger – A software trigger event occurs when you start the analog output operation (the computer issues a write to the module to begin conversions). Using software, specify the trigger source for the D/A subsystem as a software trigger.

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Using software, specify the trigger source for the D/A subsystem as an external, positive digital (TTL) trigger or an external, negative digital (TTL) trigger.

Data Format and Transfer

Data from the host computer must use offset binary data encoding for analog output signals, where 00000000 represents the negative full-scale voltage, and FFFFFFFFh represents the positive full-scale voltage. Using software, specify the data encoding as binary.

Error Conditions

The DT9847 Series modules report any underrun errors by sending an underrun event to the application. This event indicates that the data buffers are not being sent from the host to the module fast enough, and the D/A converter ran out of data. To avoid this error, try one or more of the following:

• Reduce the clock rate of the analog output operation

• Close any other applications that are running

• Run the program on a faster computer

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Digital I/O Features

This section describes the following features of digital I/O operations:

• Digital I/O lines, described below

• Operation modes, described below

Digital I/O Lines

The DT9847 Series modules support one digital input port, consisting of 4 digital input lines (lines 0 to 3) and one digital output port, consisting of 4 digital output lines (lines 0 to 3). The resolution is fixed at 4 bits; you cannot change the resolution in software.

You can read all 4 digital input lines or write all 4 digital output lines with a single-value digital I/O operation.

A digital line is high if its value is 1; a digital line is low if its value is 0. On power up or reset, a low value (0) is output from each of the digital output lines.

Principles of Operation

Operation Modes

The DT9847 Series modules support single-value digital I/O operations. You use software to specify the digital I/O port (the gain is ignored). Data is then read from or written to all the digital I/O lines.

Single-value operations stop automatically when finished; you cannot stop a single-value operation.

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Host PC

DT9847

Series #1

USB

Port 1

DT9847

Series #2

USB

Port 2

DT9847

Series #n

USB

Port n

. . .

Device Under

Test

External

Trigger

Inputs

Triggering Acquisition on Multiple Modules

Note: For DT9847 Series modules, you can synchronize acquisition on multiple modules using the Sync Bus (RJ45) connector, described on page 79.

The internal clock on the DT9847 Series modules when the synchronization mode is none (see

page 79), is derived from the USB clock and provides the timing for both the analog input and

analog output subsystems on the module.

You can start acquisition on multiple modules by connecting all modules to a shared external trigger input, as shown in Figure 23. When triggered, the modules start acquiring data at the same time.

Using this connection scheme, the measurements of one module may not be synchronous with the measurements of another module due to logic delays in the clocking and USB circuitry.

Figure 23: Triggering Multiple Modules Using an External Trigger Source

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Principles of Operation

Host PC

DT9847 Series Master

Master Synchronization Mode is Master.

Start Trigger can be Software, External Digital Trigger, or Threshold Trigger.

Reference Trigger can be External Digital Trigger or Threshold Trigger.

Sync Bus (RJ45)

DT9847 Series Slave

USB Port 2

USB Port 1

USB

Slave Synchronization Mode is Slave.

Start Trigger is ignored (Sync Bus is used).

Reference Trigger can be External Digital Trigger, Threshold Trigger, or Sync Bus. (Sync Bus is generally used in this configuration.)

Device Under Test

Inputs

Synchronizing Acquisition on Multiple DT9847 Series Modules

DT9847 Series modules provide a Sync Bus (RJ45) connector that you can use to connect and synchronize multiple DT9847 Series modules.

Note: Note that you can also connect DT9837A, DT9837B, DT9837C, and/or DT9838 modules to a DT9847 Series module in this configuration. Refer to the DT9837 Series User’s Manual and the DT9838 User’s Manual for more information.

In this scheme, one module is the master and the other modules are the slave. You specify the synchronization mode (master, slave, or none) of the A/D subsystem using software.

When configured as a master, the Sync Bus connector outputs trigger and clock signals. When configured as a slave, the Sync Bus connector accepts trigger and clock signals from the master; the start trigger source on the slave module in is ignored in this configuration since the Sync Bus is used as the start trigger. When configured as none (the default mode), the DT9847 Series module uses the USB clock instead of the Sync Bus connector. The synchronization mode remains set until changed or until the application exits.

You can connect multiple modules in one of two ways. Figure 24 shows how to connect a maximum of two DT9847 Series modules by daisy chaining them together through the Sync Bus connector. Figure 25 shows how to connect a maximum of four DT9847 Series modules by using an RJ45 distribution panel, such as the EP386, where the panel contains four RJ45 connectors that are wired in parallel.

Figure 24: Synchronizing Two DT9847 Series Modules by Daisy Chaining the Sync Bus Connectors

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DT9847 Series Master

Sync Bus

USB Port 2

DT9847 Series Slave

Host PC

USB Port 1

DT9847 Series Slave

USB Port 3

USB Port 4

Sync Bus

USB

EP386 RJ45 Distribution Panel (connectors wired

* The RJ45 cables must be less than 1 foot in length. For minimum clock skew, the master module must be less than 4 inches away from the RJ45 distribution panel.

Master Synchronization Mode is Master.

Start Trigger can be Software, External Digital Trigger, or Threshold Trigger.

Reference Trigger can be External Digital Trigger, or Threshold Trigger.

Slave Synchronization Mode is Slave.

Start Trigger is ignored (Sync Bus is used).

Reference Trigger can be External Digital Trigger, Threshold Trigger, or Sync Bus. (Sync Bus is generally used in this

Device Under Test

Inputs

Figure 25: Synchronizing Four DT9847 Series Modules Using the EP386 RJ45 Distribution Panel

When synchronizing multiple modules, start the slave modules before starting the master module. When the master DT9847 Series module is triggered (using the software trigger, external digital trigger, or threshold trigger), both the master and the slave modules start acquiring data at the same time (within one A/D conversion of the clock). Note that you can set the clock rate to be the same or different on each module.

(Shown Using an External Trigger)

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Principles of Operation

Note: It is important that you start the slave modules first, followed by the master module so that the slave receives the appropriate clock and trigger signals from the master.

If you start the master module before the slaves, the slaves never start; you will see a delay of approximately 20 seconds if you try to stop or abort the analog input operation on a slave module that is waiting for a trigger.

When you stop the master module, the slaves continue to run and return data until you stop the analog input subsystem on the slave modules. Be sure to stop the analog input subsystems on all slave modules before disconnecting the cable from the Sync Bus connectors.

Triggering DT9847 and DT9837 Series Modules Using the Sync Bus

If you are connecting the DT9847 Series module to a DT9837 Series module using the Sync Bus connector, be aware of triggering limitations.

Note: There are no triggering limitations when connecting a DT9847 Series module to a DT9838 module using the Sync Bus connector; follow the instructions on page 80 when connecting a DT9838 module.

The DT9837 Series supports the following start trigger sources: software, external digital trigger, and threshold trigger. For the reference trigger, the DT9837 Series supports only the threshold trigger source. When configured as a slave, the DT9837 Series processes a single Sync Bus trigger; the Sync Bus trigger is considered the start trigger and is received and/or driven out as such.

Consider the case where the DT9847 Series module is the master and a DT9837 Series module is the slave, as shown in Figure 26.

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Host PC

DT9847 Series Master

Device Under Test

DT9847 Series Master Synchronization Mode is Master.

Start Trigger can be Software, External Digital Trigger, or Threshold Trigger.

Reference Trigger can be External Digital Trigger, or Threshold Trigger.

Inputs

Sync Bus

(RJ45)

DT9837 Series Slave

Inputs

USB Port 2

USB Port 1

USB

DT9837 Series Slave Synchronization Mode is Slave.

Start Trigger is ignored (Sync Bus is used).

Reference Trigger can be Threshold trigger, or you can use software to stop the slave and correlate the data.

Figure 26: Synchronizing a Master DT9847 Series Module and a Slave DT9837 Series Module

Using the Sync Bus Connector

In this case, the start trigger on the master DT9847 Series module can be a software trigger, external digital trigger, or threshold trigger. The reference trigger on the master DT9847 Series module can be an external digital trigger or threshold trigger.

The start trigger on the slave DT9837 Series module is ignored, since the Sync Bus is used as the start trigger. The reference trigger on the slave DT9837 Series can be the threshold trigger, or you can use software to stop the DT9837 Series module and correlate the data.

Now, consider the case where the DT9837 Series is the master and a DT9847 Series module is the slave, as shown in Figure 27.

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Principles of Operation

Host PC

DT9837 Series Master

Device Under Test

DT9837 Series Master Synchronization Mode is Master.

Start Trigger can be Software, External Digital Trigger, or Threshold Trigger.

Reference Trigger can be Threshold, or you can use software to stop the master.

Inputs

Sync Bus

(RJ45)

DT9847 Series Slave

Inputs

USB Port 2

USB Port 1

USB

DT9847 Series Slave Synchronization Mode is Slave.

Start Trigger is ignored (Sync Bus is used).

Reference Trigger can be External Digital Trigger, or Threshold Trigger, or you can use software to stop the slave and correlate the data.

Figure 27: Synchronizing a Master DT9837 Series Module and a Slave DT9847 Series Module

Using the Sync Bus Connector

In this case, the start trigger on the master DT9837 Series module can be a software, external digital, or threshold trigger. The reference trigger on the master DT9837 Series module can be the threshold trigger.

The start trigger on the slave DT9847 Series module is ignored, since the Sync Bus is used as the start trigger. The reference trigger on the slave DT9847 Series module can be an external digital trigger or threshold trigger (the Sync Bus trigger is not supported as a reference trigger in this configuration), or you can use software to stop the DT9847 Series module and correlate the data.

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Supported Device Driver Capabilities