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Geokon 8020-42CPR Installation Instructions Manual

Single coil autoresonant adapter, 4-20ma output
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Installation Instructions
Model 8020-42CPR
Single Coil Autoresonant Adapter
4-20Ma Output
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 © 2007-2018 by Geokon, Inc.
(Rev F, 08/23/2018)

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Summary of Contents for Geokon 8020-42CPR

  • Page 1 Single Coil Autoresonant Adapter 4-20Ma Output 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 3.2 G ......................3 ENERIC ATALOGGER ONFIGURATION 3.3. S ........................4 TAND LONE ONFIGURATION 6. OUTPUT TO DIGITS CONVERSION ........................ 5 APPENDIX A.

  • Page 5: Introduction

    1. INTRODUCTION The Geokon 8020-42CPR 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, resulting in a greater dynamic range (up to 20Hz). The benefits of Autoresonant vs. Pluck and Read topologies are many, including greater reading stability and wider dynamic bandwidth.

  • Page 6: Connections

    Ground Ground 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

    When “CR10EN” and “CR10CLK” are both high, the 8020-42CPR will wake up and wait for the swept frequency excitation signal to appear at EX. The 8020-42CPR will track and apply this swept frequency to the VW gage. Once the swept frequency is complete, the 8020-42CPR will lock onto the returned VW signal and maintain excitation by applying one excitation pulse for every 16 cycles of VW frequency.

  • Page 8: Stand Alone Configuration

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

  • Page 9: Output To Digits Conversion

    Where; mA = 8020-42CPR 4-20mA output signal For example: If the 8020-42CPR is outputting a 4-20mA current of 12mA then: Digits = 12250 – [625 x (12 – 4)] Digits = 12250 – [625 x 8] Digits = 12250 – 5000...

  • Page 10: Appendix A. Specifications

    APPENDIX A. SPECIFICATIONS POWER 6-15 VDC (12V nominal) Power Requirements: Sleep: 30 µA (max.), 20µA (typ.) Plucking: 50 mA peak Current Consumption: PLL locked: 30 mA (max.), 22 mA (typ.) 50 mA (max) with 4-20mA Iout PLL Capture Range: 1200 – 4000 Hz 1150 –...

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