Campbell TDR200 Instruction Manual
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Campbell TDR200 Instruction Manual

Based time-domain reflectometry system
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TDR200-Based Time-Domain
Reflectometry System
Revision: 4/17
C o p y r i g h t
©
2 0 1 6 - 2 0 1 7
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for Campbell TDR200

  • Page 1 TDR200-Based Time-Domain Reflectometry System Revision: 4/17 C o p y r i g h t © 2 0 1 6 - 2 0 1 7 C a m p b e l l S c i e n t i f i c ,...
  • Page 4 (780) 454-2655. Campbell Scientific (Canada) Corp. is unable to process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the client at the client’s expense.
  • Page 5 Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CLIENT ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.
  • Page 6 PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. (CSI) primarily for the US market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in...

  • Page 8: Table Of Contents

    TDR200 Packing List................2 SDM8X50 Packing List ............... 2 ENCTDR100 Packing List ..............2 4. QuickStart ..............2 Getting Started with TDR200 using PC-TDR ........2 5. Overview ..............7 6. Specifications ............. 8 TDR200 Performance ................8 Electromagnetic Compatibility ............9 SDM8X50 Major Specifications ............
  • Page 9 7-2. Terminal strip adapters for connections to battery ......12 7-3. ENCTDR100 with SDM8X50, PS150, TDR200, and CR1000 ..14 8-1. Waveforms collected in a sandy loam using CS610 probe with RG8 connecting cable. Volumetric water content is 24% and bulk electrical conductivity is 0.3 dS m...
  • Page 10 0.10, 0.18, 0.26, 0.30, and 0.37. Solution electrical conductivity is 10.2 dS m –1 .................. 20 A-1. SDMX50 signal attenuation ............A-3 A-2. Location of address jumpers on SDMX50 ........A-4 CRBasic Example B-1. TDR200 Program Using One CS635 Connected to the SDM8X50..................B-1...
  • Page 11 Table of Contents...

  • Page 12: Introduction

    • Upon receipt of the equipment, inspect the packaging and contents for damage. File damage claims with the shipping company. Check the contents of the shipment (see Section 3.1, TDR200 Packing List • , Section 3.2, SDM8X50 Packing List , and Section 3.3, (p.

  • Page 13: Tdr200 Packing List

    Getting Started with TDR200 using PC-TDR This section lists steps for a simple connection between a computer and the TDR200 to monitor a single TDR probe using PC-TDR software. A single probe is connected directly to the TDR200, and no multiplexers are used.
  • Page 14 TDR200-Based Time-Domain Reflectometry System Use the supplied Type A to Micro B male USB cable to connect the PC to the USB port on the TDR200. The TDR200 is typically powered via the USB port during setup. Connect a TDR probe to the BNC connector of the TDR200.
  • Page 15 After the USB driver has been installed, select the Serial Port. Typically, use the default baud rate of 57,600. The SDM Address must match the address of the TDR200. For Noise Rejection Frequency, select 50 Hz or 60 Hz rejection if the system is near ac power lines. The TDR...
  • Page 16 TDR200-Based Time-Domain Reflectometry System Select the probe from the list on the left panel, confirm the parent device and device type, and click Ok. In the right pane, enter the Cable Length (required). Cable Length, Window Length, Probe Length, and Probe Offset settings will be...
  • Page 17 TDR200-Based Time-Domain Reflectometry System 11. Enter a name for the CRBasic program. Click to specify where to save the program and what type of program to generate (CR1000, CR3000, CR800 Series, or CR6). Press Next. 12. Select what is measured and stored, as well as time intervals for...

  • Page 18: Overview

    Overview The TDR200 generates a short rise time electromagnetic pulse that is applied to a coaxial system and samples and digitizes the resulting reflection waveform for analysis or storage. It has a single BNC connector for communication with an attached coaxial cable.

  • Page 19: Specifications

    12 V power supply, weatherproof enclosure, and solar panel is used to get automated measurements at prescribed time intervals. A single TDR probe can be connected directly to the TDR200 or multiple probes connected using SDM8X50 coaxial multiplexers. For field applications, the ENCTDR100 enclosure is recommended. The...

  • Page 20: Electromagnetic Compatibility

    Weight: 0.79 kg (1.75 lb) Electromagnetic Compatibility The TDR200 is Πcompliant with performance criteria available upon request. RF emissions are below EN55022 limit. The TDR200 meets EN61326 requirements for protection against electrostatic discharge and surge except for electrostatic discharge on the center conductor of the panel BNC connector.

  • Page 21: Sdm8X50 Major Specifications

    TDR200-Based Time-Domain Reflectometry System SDM8X50 Major Specifications 6.3.1 Physical Consists of Size When Used SDM8X50 50 Multiplexer circuit Weight: 590 g When the board encased in (1.3 lb) Ohm Coaxial multiplexer Multiplexer metal housing and will be housed Multiplexer Housing...

  • Page 22: Installation

    FIGURE shows the three multiplexer levels allowing up to 512 probes to be measured. The first level includes the TDR200 and one multiplexer. Up to eight coaxial cables connect to each multiplexer. The coaxial cables can be connected to TDR probes or the next level’s multiplexers.

  • Page 23: Sdm8X50

    Spark gaps protect against voltage surge damage. Hermetically sealed, non-latching electromechanical relays are activated to connect the TDR200 to different multiplexer channels. After a 30 second timeout, the relays unlatch providing additional surge protection. Relays used on the ground and signal lines fully isolate each sensor during measurements.

  • Page 24: Sdm Communication

    This communication protocol adheres to an addressing scheme for all communicating devices. The address selected on the TDR200 must match the SDM address used in the datalogger program. The three multiplexer levels (FIGURE 7-1, TDR System...

  • Page 25: Enctdr100

    7.1.6.1 Mounting Equipment in ENCTDR100 The ENCTDR100 is a 16-inch-by-18-inch weathertight enclosure modified for use with a Campbell Scientific TDR system (FIGURE 7-3). It includes the following: Enclosure supply kit consisting of desiccant packs, humidity indicator, •...

  • Page 26: Soil Probes

    If the datalogger and PC-TDR are simultaneously measuring the NOTE TDR200, an error will occur in either the datalogger data stream or PC-TDR. The error can be prevented by halting the datalogger program while controlling the TDR200 with PC-TDR. To halt the CRBasic program, go to File Control | Stop Program.

  • Page 27: Tdr200() Crbasic Instruction

    7.2.2 PortsConfig CRBasic Instruction If using a CR800, CR850, or CR1000, the PortsConfig() CRBasic instruction may be needed at the end of the program. When the TDR200 is connected to the datalogger for SDM control and SDM8X50 multiplexers are also connected, the PortsConfig() instruction is required to properly configure the control ports.
  • Page 28 01138 − 01758 The TDR200 generates a very fast rise time pulse that is sent to the connecting cable and probe. Reflections over a specified length of transmission line are sampled and digitized. Discontinuities in cable impedance causes changes in the amplitude of the reflected signal.

  • Page 29: Conditions That Effect Water Content Measurements

    TDR probe. The pulse generated by the TDR200 and its reflections are subject to distortion during travel between the TDR200 and the TDR probe. The cable connecting the probe to the reflectometer has a characteristic impedance resulting in both resistive and reactive losses.

  • Page 30: Soil Electrical Conductivity Effect On Water Content Measurement

    RG8. Careful probe design ensures correct probe impedance giving robust reflections. All TDR probes offered by Campbell Scientific are designed to optimize accuracy when longer cable lengths are used.

  • Page 31: Filtering And Averaging

    The WaveAvg setting is used to define the number of waveform reflections averaged by the TDR200 to give a single result. A waveform averaging value of 4 provides good signal-to-noise ratio under typical applications. Under high...

  • Page 32: Algorithms For Calculation Of Tdr Probe Rod Apparent Length

    TDR200 to calculate bulk electrical conductivity. The electrical conductivity calculation uses waveform values for the region immediately before the TDR probe and values from about 200 meters from the TDR200. The value at the location before the probe is used to calculate the applied signal and the 200 meter values are used for the reflected signal.

  • Page 33: References

    With the point of the maximum first derivative as the right hand point, define a window of 10 waveform values. Incrementally move this window toward the TDR200 until all values are less than the threshold calculated in step 4. Calculate the average of this window of values and use for the applied signal.

  • Page 34: Sdmx50-Series Multiplexers

    Prior to the SDM8X50, the SDMX50 series multiplexers were used with the TDR100 to measure multiple sensors. SDMX50 series multiplexers are also compatible with the TDR200. The SDMX50SP was identical to the SDM8X50 in form, fit, and function. The SDMX50 came with the multiplexer mounted in a 10-inch x 12-inch enclosure, similar to the SDM8X50-E.

  • Page 35: Electrical

    Appendix A. SDMX50-Series Multiplexers SDMX50SP Multiplexer Weight: 590 g When the circuit board 50 Ohm (1.3 lb) multiplexer will Coaxial encased in metal be housed in the Multiplexer Multiplexer housing and a same enclosure Housing with Strain separate strain as the datalogger Dimensions with Relief Bracket relief bracket.

  • Page 36: Sdm Communication

    FIGURE shows the location of jumpers used for SDMX50 addressing. It is recommended to use a TDR200 address of 0, level 1 SDMX50 address of 01, level 2 SDMX50 address of 02, and level 3 SDMX50 address of 03.
  • Page 37 Appendix A. SDMX50-Series Multiplexers FIGURE A-2. Location of address jumpers on SDMX50...

  • Page 38: Example Program

    CR6-series datalogger. One CS635 TDR probe is connected to channel 1 on an SDM8X50 multiplexer. The CS635 has a 2 m cable and a 3 m window. CRBasic Example B-1. TDR200 Program Using One CS635 Connected to the SDM8X50 'Sample TDR200 program on CR6 datalogger...

  • Page 40: Calibration Wizard Tutorial

    Appendix C. Calibration Wizard Tutorial The calibration wizard is designed to help users: Calibrate TDR probes to eliminate any probe to probe variability • • Create probe-specific lengths and offsets for user-made probes Quickly determine the appropriate cable and window lengths of any •...
  • Page 41 Appendix C. Calibration Wizard Tutorial A waveform with a default window length of 50 m is then displayed with PC-TDR highlighting where it thinks the probe is found. If the probe is not within the highlighted region, click on the highlighted area in the wizard’s window and move or scale the region to encompass the entire portion of the probe.
  • Page 42 Appendix C. Calibration Wizard Tutorial A detailed measurement is performed and the probe start and end are measured. If the probe’s reflections are not properly found, click Refresh and attempt to find the beginning and end again. If the waveform is noisy, increase the number of averages or adjust the filtering level (Section 8.3, ).
  • Page 43 Appendix C. Calibration Wizard Tutorial The air measurement is now graphed with the beginning and ending of the probe highlighted. If the highlighted region does not properly represent the beginning or end of the probe, either enter new values into the text boxes below the window or use the cursor within the graph window to adjust the width and location of the start and end positions.
  • Page 44 Appendix C. Calibration Wizard Tutorial 10. After the Calibration Summary window is displayed, click Finish and the values from the summary will be automatically applied to the probe that was calibrated.
  • Page 45 Appendix C. Calibration Wizard Tutorial...

  • Page 46: Terminal Commands

    Appendix D. Terminal Commands D.1 Introduction The TDR200 was developed to be interfaced as a virtual COM port via its physical built-in USB port and to be controlled using third party or user-created application-specific software. In order to use the virtual COM port feature and control the TDR200, a compatible USB driver needs to be installed on the host machine.

  • Page 47: About Notation Used In This Document

    GVER, GSIG, GVAR, GWA, RSU, and SSU do not require a parameter. For these commands, usage is of this form: [Command]\r\n. For example, to return the current version of the TDR200 operating system the command is “GVER\r\n” Responses to these commands begin with a CR and LF and the response to the command follows.

  • Page 48: Error Response

    • range. • Undefined Value – returned when there is an error in the input parameter. Initialization Failed – returned if the TDR200 initialization failed. • • Unknown Internal D.1.4.2 Ack Response Ack responses are returned by the sensor in response to commands that set a parameter in the device.
  • Page 49 Appendix D. Terminal Commands SDI – Set Distance Usage: SDI[space][value]\r\n – range of value = [-2.0 – 3822.0] Response: \r\n>[space]SDI SWL – Set Window Length Usage: SWL[space][value]\r\n – range of value = [0.0 – 3824.0] Response: \r\n>[space]SWL SPL – Set Probe Length Usage: SPL[space][value]\r\n –...
  • Page 50 Appendix D. Terminal Commands DUMP – Show Measurement Parameters: Usage: DUMP\r\n Response: \r\nSetup has been configured as follows: \r\n Vp = [vp value] \r\n Ave = [number of averages value] \r\n Points = [number of points value] \r\n Distance (Cable Length) = [cable length value] \r\n Window Length = [window length value] \r\n...
  • Page 51 Appendix D. Terminal Commands GMO – Acquire a new Waveform and return Water Content Value Usage: GMO\r\n Response: \r\n[f.ffff] – where f.ffff is an ASCII representation of a floating point value (4 decimal places) GVER – Get Operating System Version Usage: GVER\r\n Response: \r\n[version] –...
  • Page 53 Santo Domingo, Heredia 40305 SOUTH AFRICA COSTA RICA • cleroux@csafrica.co.za • info@campbellsci.cc www.campbellsci.co.za www.campbellsci.cc Campbell Scientific Southeast Asia Co., Ltd. Campbell Scientific Ltd. 877/22 Nirvana@Work, Rama 9 Road Campbell Park Suan Luang Subdistrict, Suan Luang District 80 Hathern Road Bangkok 10250...

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