Campbell TDR100 Manuál s instrukcemi Strana 1

INSTRUCTION MANUALTDR100Revision: 9/05Copyright (c) 2000-2005Campbell Scientific, Inc.

TDR100 4 1 is the default setting and can be changed in PCTDR menu Settings/Communications. The baud rate is factory set to 57600. 3. Connect 12 vol

TDR100 5 FIGURE 3-1. Waveform of a CS610 in water. Changing the Waveform Start value to 5.7 m and the Waveform Length to 5 m gives the waveform disp

TDR100 6 FIGURE 3-2. Waveform of CS610 in water after changing Start and Length parameters to display relevant portion of reflected signal. 3.2 PCT

TDR100 7 When the TDR100 is connected to a CR23X or CR1000 datalogger using control ports 1-3 for SDM control and SDMX50 multiplexers are also connect

TDR100 8 4.3 Menu Selections 4.3.1 File Menu Save Configuration/Load Configuration - save and reload configuration of user-selectable parameters. S

TDR100 9 4.4.2 Waveform Average - sets the number of measurements averaged at a given distance from the TDR100. A value of 4 is recommended. Higher

TDR100 10 FIGURE 4-1. PCTDR waveform for CS610 in water. The algorithm will use the length of the waveform set by the Waveform Length. After findin

TDR100 11 ()LLwv=⋅++−θmax..017601142 with L the actual probe rod length, and, θv-max the maximum expected volumetric water content. Two m is added for

TDR100 12 LoggerNet (version 3.0 or higher) are used to create and send the CRBasic Program to the CR1000 datalogger. 5.3 TDR100 The TDR100 contains

TDR100 13 5.4.1 Grounding The TDR system should be installed with a single ground point. A good earth ground should be established close to the data

Warranty and Assistance The TDR100 is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and

TDR100 14 TABLE 5-1. SDM Addressing Base 10 Number Instruction 119 Address (Base4) TDR100 Thumbwheel Switch Level 1 SDMX50 Mux (TDR100+1) MSD LSD L

TDR100 15 5.6.1 Mounting Equipment in ENCTDR100 The ENCTDR100 is a 16” x 18” weathertight enclosure that is modified for use with a Campbell Scientif

TDR100 16 from voltage surge damage. Figure 5-3 describes typical signal attenuation from the common to one output channel for frequency range import

TDR100 17 FIGURE 5-4. Location of Address Jumpers on SDMX50 5.8 Soil Probes The TDR probes are the sensors of the TDR measurement system and are in

TDR100 18 5.8.1 Determining Probe Constant, Kp, using PCTDR Section 6.2.6 presents the principles for TDR measurements of soil electrical conductivit

TDR100 19 6.2 Discussion of TDR Instruction Parameters (Instruction 119) 6.2.1 Parameter 1: SDM Address The SDM address of the TDR100 is set by sele

TDR100 20 Section 7 for discussion of the electrical conductivity measurement method and Section 6.2.13.1 for discussion of Kp.. 6.2.3 Parameter 3: M

TDR100 21 6.2.5 Parameter 5: Relative Propagation Velocity Relative propagation velocity is the ratio of actual propagation velocity for a transmissi

TDR100 22 6.2.10 Parameter 10: Probe Offset (meters) Most TDR probes have a block of epoxy or other material which holds the rods rigidly spaced and

TDR100 23 6.2.12 Parameter 12: Multiplier Multiplication factor applied to the value stored in the input location specified in parameter 11. Set to

i TDR100 Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab

TDR100 24 Entering these constants as the multiplier when using Instruction 119 for electrical conductivity measurement will give units of Siemens/met

TDR100 25 Mux/ProbeSelect: The Mux/Probe Select parameter is used to define the setup of any multiplexers and attached probes in the system. The addre

TDR100 26 parameter only has an affect when Option 0, La/L, is used for the measurement. Mult, Offset: The Mult and Offset parameters are each a const

TDR100 27 caused by the probe beginning and end. This information is then analyzed to determine soil water content. While the velocity of the applied

TDR100 28 16 meter cable26 meter cable45 meter cable66 meter cable FIGURE 8-1. Waveforms collected in a sandy loam using CS610 probe with RG8 connect

TDR100 29 water content = 9.5%water content = 25% FIGURE 8-2. Waveforms collected in a sandy loam using CS610 probe with RG8 connecting cable. Volum

TDR100 30 9. Programming Examples 9.1 CR10X/CR23X Program Examples Example 1, Measure and Record; Analog Measurements and Volumetric Water Content A

TDR100 31 ;Turn off the switched 12V to power off the TDR100: 5: Do (P86) 1: 55 Set Port 5 Low ;Set the Output Flag to output data every 5 m

TDR100 32 Example 2, Measure and Record; Analog Measurements, Volumetric Water Content, Electrical Conductivity, and Capture a Waveform A CS605 or CS6

TDR100 33 ;Measure the CS610 probe connected to Channel 3 of the level 1 SDMX50 and return La/L. 5: TDR100 Measurement (P119) 1: 0 SDM Address 2

TDR100 Table of Contents ii 5.8 Soil Probes ... 17 5.8.1 D

TDR100 34 ;Measure Electrical Conductivity on the same CS610 TDR probe connected to Channel 3. 9: TDR100 Measurement (P119) 1: 0 SDM Address 2:

TDR100 35 ;Output the Battery_Voltage, DataLogger Temperature, WaterContent, ;and Electrical Conductivity. 14: Sample (P70) 1: 4 Reps 2: 1

TDR100 36 Example 3, Measure and Record; Volumetric Water Content and Analog Measurements Eight CS605 or CS610 probes are connected to Channel #1 thro

TDR100 37 4: Beginning of Loop (P87) 1: 0 Delay 2: 8 Loop Count ;Square La/L to convert to dielectric constant: ;Note: The user must manually

TDR100 38 ;Output the 8 water content measurements and battery voltage: 12: Sample (P70) 1: 9 Reps 2: 11 Loc [ WC_1 ] *Table 2 Progra

TDR100 39 Example 4, Measure and Record; Analog Measurements and Volumetric Water Content In this example analog measurements are made every 5 minutes

TDR100 40 5: TDR100 Measurement (P119) 1: 00 SDM Address 2: 0 La/L 3: 3006 MMMP Mux & Probe Selection 4: 4 Waveform Averaging 5:

TDR100 41 ;Switch the level 1 SDMX50 to Channel 2, the level 2 SDMX50s to Channel 8 and ;measure the 8 probes (channels 1 through 8) on the Level 3 S

TDR100 42 ;Output the 29 TDR water content measurements: 15: Sample (P70) 1: 29 Reps 2: 11 Loc [ WC_3001 ] *Table 2 Program 02: 0.0000

TDR100 43 Example 5, Trouble Shooting Program for SDMX50 Multiplexer, Datalogger Control Ports, and Analog Measurements The following program can be u

TDR100 Table of Contents iii 8-1 Waveforms collected in a sandy loam using CS610 probe with RG8 connecting cable. Volumetric water content is 24% an

TDR100 44 9.2 CR1000 Program Example Example 1, Measure and Record; Analog Measurements, Volumetric Water Content, and Capture TDR Probe Waveforms Eq

TDR100 45 Public Flag(2) public WavePT(260) public MuxChan Dim I 'Declare Constants ------------------------------------------------ 'Topp

TDR100 46 If TimeIntoInterval(0,24,Hr) then flag(2)=high ' If Flag(1)=High Then '************************************* SW12 (1

TDR100 47 TDR100 (WavePT(),0,1,6001,4,1.0,251,9.5,5.0,0.3,0.085,1,0) CallTable TDR_Wave() ' MuxChan=7001 TDR100 (WavePT(),0,1,7001

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Campbell Scientific CompaniesCampbell Scientific, Inc. (CSI)815 West 1800 NorthLogan, Utah 84321UNITED [email protected]

TDR100 Table of Contents iv This is a blank page.

1 TDR100 1. Introduction This document presents operating instructions for the TDR100 and associated equipment and discusses time domain reflectometr

TDR100 2 2. System Specifications 2.1 General See the CR10X, CR23X, or CR1000 datalogger manuals for datalogger specifications. 2.2 Power Consumpti

TDR100 3 waveform averaging 1 to 128 electrostatic discharge protection internal clamping power supply unregulated 12 volt (9.6 V to 16 V), 300 mil