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Geokon 8020-42 Installation Instructions Manual

Single coil autoresonant adapter
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Installation Instructions
Model 8020-42
Single Coil Autoresonant Adapter
No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc.
The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no responsibility for
errors, omissions, or misinterpretation. The information herein is subject to change without notification.
Copyright © 2000-2018 by Geokon, Inc.
(Rev D, 08/21/2018)

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Summary of Contents for Geokon 8020-42

  • Page 1 Single Coil Autoresonant Adapter No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc. The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no responsibility for errors, omissions, or misinterpretation.
  • Page 3 Upon examination by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge. However, the WARRANTY is VOID if the unit shows evidence of having been tampered with...

  • Page 4: Table Of Contents

    TABLE of CONTENTS 1. INTRODUCTION ..............................1 2. CONNECTIONS ..............................2 3. CONFIGURATIONS ............................. 3 3.1 M -10 D ......................3 ICRO ATALOGGER ONFIGURATION 3.2 G ......................4 ENERIC ATALOGGER ONFIGURATION 3.3 S ......................... 5 TAND LONE ONFIGURATION APPENDIX A. SPECIFICATIONS .......................... 7 APPENDIX B.

  • Page 5: Introduction

    1. INTRODUCTION The Geokon 8020-42 Single Coil Autoresonant Adapter (SCA) is a device that allows single coil vibrating wire gages to be driven in the “Autoresonant” mode, instead of the standard “Pluck and Read” mode. The benefits of Autoresonant vs. Pluck and Read topologies are many, including greater reading stability and wider dynamic bandwidth.

  • Page 6: Connections

    5V(pp) @ 50Ω Table 1 - Connector/Signal Description NOTE: Because the 8020-42 requires each vibrating wire gage to have its own pair of twisted leads, the 8020-42 is not compatible with Geokon models 4900 (VW Load Cell) and 4350-3 (Biaxial Stressmeter).

  • Page 7: Configurations

    EX. The 8020-42 will track and apply this swept frequency to the VW gage. Once the swept frequency is complete, the 8020-42 will lock onto the returned VW signal and maintain excitation by applying one excitation pulse for every 16 cycles of VW frequency.

  • Page 8: Generic Datalogger Configuration

    *Either F1 or F2 can be used to connect to the CR-10 1H input. 3.2 Generic Datalogger Configuration The 8020-42 can be incorporated as the vibrating wire interface for any datalogger that is capable of reading a frequency input and has the ability to output a single 5V CMOS level control signal.

  • Page 9: Stand Alone Configuration

    VW frequency. In order to configure the 8020-42 for Stand Alone mode, internal jumpers JP1, JP2 and JP3 must be set across pins two and three. Remove the cover of the 8020-42 and set the jumpers:...

  • Page 10: Table 4 - Stand Alone Configuration/Connections

    Connector Signal Signal Connection Position Name Description Temperature Proportional Voltage See Appendix B Vibrating Wire Gage Frequency To Frequency (200mv/pp) Counter Thermistor Excitation See Appendix B +12V +12V Power Supply Ground Ground From Thermistor 3kΩ @ 25° C Thermistor + input From Thermistor 3kΩ...

  • Page 11: Appendix A. Specifications

    APPENDIX A. SPECIFICATIONS POWER Power Requirements: 6-15 VDC (12V nominal) Sleep: 30 µA (max.), 20µA (typ.) Current Consumption: Plucking: 50 mA peak PLL locked: 30 mA (max.), 22 mA (typ.) 1200 – 4000 Hz PLL Capture Range: PLL Lock Range: 1150 –...

  • Page 12: Appendix B. Temperature Measurement

    APPENDIX B. TEMPERATURE MEASUREMENT The temperature of the gage itself can be determined by measuring the temperature proportional voltage output at T, use that voltage to determine the resistance value of the gage thermistor, and then input that value into the Steinhart and Hart log equation. For example, with 2.5 Volts connected to EX, and the voltage measured at T = 1.4025 V: 1.

  • Page 13: Table 6 - Thermistor Resistance Versus Temperature

    Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp +110 201.1K 16.60K 2417 525.4 153.2 187.3K 15.72K 2317 507.8 149.0 174.5K 14.90K 2221 490.9 145.0 162.7K 14.12K 2130 474.7 141.1 151.7K 13.39K 2042 459.0 137.2 141.6K 12.70K 1959 444.0 133.6 132.2K 12.05K...

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