Campbell TDR Specifiche Pagina 1

TDR100Revision: 2/10Copyright © 2000-2010Campbell Scientific, Inc.

TDR100 port 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

TDR100 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 displa

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

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

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

TDR100 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 v

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

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

TDR100 5.3 TDR100 The TDR100 contains the pulse generator for the signal applied to a TDR probe. The TDR100 also digitizes the reflection and applie

TDR100 5.5 Power Supply The system operates on 12 V power. A user supplied deep cycle 12 V lead acid battery is commonly used in remote installation

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 components in the enclosure. A short run of heavy gage (10 AWG or heavier) wire should be connected from the enclosure lug to earth ground. Th

TDR100 FIGURE 5-4. Location of Address Jumpers on SDMX50 TABLE 5-1. SDM Addressing for Early SN SDMX50s and Edlog Dataloggers Base 10 Number In

TDR100 5.6.2 SDM Cable and Cable Length Considerations A 5-conductor cable with shield and drain is used for interconnection of SDM devices. The 5 c

TDR100 SEDIFFGGH L121AG H L AG H L AG E1 AG E2 G342563SEDIFFGGH L784AG H L AG H L AG E3 AG G G910511 126P1 G P2 G C8 C7 C6 C5 C4 C3 C2 C1 G 12V 12VSDM

TDR100 Campbell Scientific TDR Probes CS605 CS610 General Description 3-rod probe no balun required stainless steel rods 3-rod probe no balun requir

TDR100 SDMAddress: The SDMAddress parameter defines the address of the TDR100 with which to communicate. Valid SDM addresses are 0 through 14. Address

TDR100 length is used by the analysis algorithm to begin searching for the TDR probe. If a 1 or 2 is entered for the Option parameter, cable length is

TDR100 Waveform Averaging 4: FP 1 - 128 Number of reflections averaged by the TDR100. Vp 5: FP .1 - 1 relative propagation velocity Points 6: FP 2

TDR100 6.3.2.2 Enter 1: Collect Waveform The digitized reflection waveform can be collected from the TDR100 by the datalogger in ASCII format. Datal

TDR100 8 8 consecutive probes are read; the probes are connected to channels 1, 2, 3, 4, 5, 6, 7, and 8 of the level 1 multiplexer. Example 2 An e

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

TDR100 beginning of the probe can be read from the x-axis. Subtract 0.5 meters from the beginning distance and use that value in parameter 7 of datal

TDR100 TABLE 6-1. Reflection waveform array header elements. Description of Array Header Elements 1 averaging 2 propagation velocity 3 number of dat

TDR100 The probe constant (Kp) is easily determined using PCTDR or can be determined through calibration. The probe rods are immersed in solutions of

TDR100 The relationship between dielectric constant and volumetric water content has been described by, among others, Topp et al. (1980) and Ledieu et

TDR100 8. Cable Length and Soil Electrical Conductivity Effect on Water Content Determination 8.1 Cable Length Effect on Water Content Measurement T

TDR100 cable lengths will be maintained as long as soil electrical conductivity does not prevent a reflection from the end of the probe rods. This is

TDR100 water content = 18%water content = 37% FIGURE 8-3. Waveforms collected in a sandy loam using CS610 probe with RG8 connecting cable. Volumetri

TDR100 9.2.1.1 Waveform Evaluation Figure 9-1 shows a typical waveform and identifies key points. The waveform before point 1 is the section of coax

TDR100 9.2.2 Algorithm Parameter Adjustment for Special Conditions The standard settings for the apparent length algorithm work well for nearly all a

TDR100 9.3 Algorithm for Calculation of Bulk Electrical Conductivity 9.3.1 Algorithm Description Section 7, TDR Principles, presents the equation an

TDR100 Table of Contents 5.8 Soil Probes ... 17 5.8.1 Dete

TDR100 To view the current parameter values type GECP at the > prompt. The values of the 4 parameters are returned. The default values for the thr

TDR100 10. Programming Examples 10.1 CR1000 Program Example Example 1, Measure and Record; Analog Measurements, Volumetric Water Content, and Captur

TDR100 'CR1000 Series Datalogger 'program: c:\mydoc\cr1000\cr1000-testing\TDR&SDM&F1&Wave_CR1K.CR1 'date: 10-27-04 'M

TDR100 'Main Program --------------------------------------------------- BeginProg SDMSpeed (50) 'Fix TDR100 to CR1K communication timing

TDR100 ' MuxChan=3001 TDR100 (WavePT(),0,1,3001,4,1.0,251,9.5,5.0,0.3,0.085,1,0) CallTable TDR_Wave() ' MuxChan=4001 TD

TDR100 ;{CR10X} ; ;Program Name = T100EX#1 ; *Table 1 Program 01: 60 Execution Interval (seconds) ;Measure the datalogger power supply voltage:

TDR100 ;Output a time stamp; year, day, and hour/minute: 7: Real Time (P77) 1: 1220 Year,Day,Hour/Minute (midnight = 2400) ;Output the minimu

TDR100 1: If Flag/Port (P91) 1: 21 Do if Flag 1 is Low 2: 0 Go to end of Program Table ;Measure the datalogger power supply voltage: 2:

TDR100 ;Apply Topp's 3rd order polynomial: 8: Polynomial (P55) 1: 1 Reps 2: 4 X Loc [ WC_CH3 ] 3: 4 F(X) Loc [ WC_CH3 ] 4

TDR100 ;Turn off the switched 12V to power off the TDR100: 11: Do (P86) 1: 55 Set Port 5 Low ;Set the Output Flag to output data each time me

TDR100 Table of Contents 11. References ...51 Figures 3-1 Waveform of a CS610 in water..

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

TDR100 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 all

TDR100 *Table 2 Program 02: 0.0000 Execution Interval (seconds) *Table 3 Subroutines End Program Example 4, Measure and Record; Analog Measurem

TDR100 ;{CR10X} ;Program = T100EX#4 *Table 1 Program 01: 300 Execution Interval (seconds) ;Every 5 minutes (300 second execution interval) ;Meas

TDR100 6: TDR100 Measurement (P119) 1: 00 SDM Address 2: 0 La/L 3: 1108 MMMP Mux & Probe Selection 4: 4 Waveform Averaging 5: 1

TDR100 ;Turn off the switched 12V to power off the TDR100: 9: Do (P86) 1: 55 Set Port 5 Low ;Now, after making the measurements, set the outp

TDR100 FIGURE 10-1. Twenty-nine CS605 or CS610 probes connected to 4ea SDMX50 multiplexers. Example 5, Trouble Shooting Program for SDMX50 Multiplex

TDR100 ;NOTE: While Flag 1 is high Instruction 109 will take control of the ;SDM ports 1-3. It may not be possible to follow the ports ;going High an

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TDR100 Table of Contents iv

Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbel

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

TDR100 2. System Specifications 2.1 General See the CR10X, CR23X, CR800/CR850, CR1000, or CR3000 datalogger manuals for datalogger specifications. 2

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