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TDR200

TDR200-Based Time-Domain

Reflectometry System

Revision: 8/19

Campbell Scientific

Product Manual

Summary of Contents for TDR200

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Page 3: ...under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order Quotations for repairs can be give...

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Page 5: ...digital cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European marke...

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Page 7: ...beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit cl...

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Page 9: ...er Control 9 7 1 1 Data Logger 10 7 1 2 TDR200 10 7 1 3 SDM8X50 10 7 1 4 Power Supply 11 7 1 4 1 Grounding 11 7 1 5 SDM Communication 12 7 1 6 ENCTDR100 12 7 1 6 1 Mounting Equipment in ENCTDR100 12 7...

Page 10: ...inal strip adapters for connections to battery 11 7 3 ENCTDR100 with SDM8X50 PS150 TDR200 and CR1000 13 8 1 Waveforms collected in a sandy loam using CS610 probe with RG8 connecting cable Volumetric w...

Page 11: ...re rod of TDR probes connected to the TDR200 The maximum recommended total length of all synchronous device for measurement SDM cables should not exceed 500 feet Longer total lengths cause unreliable...

Page 12: ...DR100 Packing List The following are included with an ENCTDR100 Enclosure Supply Kit that includes desiccant packs humidity indicator cable ties putty and mounting hardware ENCTDR100 Enclosure Ground...

Page 13: ...e Serial Port 7 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 A...

Page 14: ...settings will be automatically entered when using the Calibration Wizard Appendix B Calibration Wizard Tutorial p B 1 Before using the Calibration Wizard physically connect all multiplexers and sensor...

Page 15: ...try System 5 11 Enter a name for the CRBasic program Click to specify where to save the program and what type of program to generate Press Next 12 Select what is measured and stored as well as time in...

Page 16: ...parate strain relief bracket for the coaxial cables Both the multiplexer housing and the strain relief bracket have holes drilled at a 1 inch spacing This allows the SDM8X50 to be mounted to a wall or...

Page 17: ...s the TDR200 and other system components from weather condensing humidity and dust 6 Specifications Features Uses compact low cost TDR200 with performance features that match or exceed other available...

Page 18: ...120 mA 1 mA Temperature range 40 to 85 C Height 10 7 cm 4 2 in Width 5 1 cm 2 0 in Length 21 6 cm 8 5 in Weight 0 79 kg 1 75 lb 6 2 Electromagnetic Compatibility The TDR200 is compliant with performan...

Page 19: ...e includes a bracket for mounting to a tripod a tower or a 1 0 in to 1 25 in IPS Schedule 40 pipe Weight 4 4 kg 9 8 lb Enclosure Outside Dimensions with Mounts 40 x 29 x 17 5 cm 16 x 12 x 7 in Enclosu...

Page 20: ...rical algorithms for measuring volumetric water content or electrical conductivity The TDR200 communicates with the data logger using SDM protocol or with a computer using PC TDR and serial communicat...

Page 21: ...er the TDR200 This practice reduces power consumption and resets the TDR200 which provides automatic recovery from system malfunctions and reduces loss of measurement data when a problem exists The SW...

Page 22: ...l cables are needed to connect different levels of multiplexers use the CABLE5CBL L cable The maximum total length of all SDM cables should not exceed 500 feet to ensure reliable communication between...

Page 23: ...g the waveguide will occur where there are impedance changes The impedance value is related to the geometrical configuration of the probe size and spacing of rods and also is inversely related to the...

Page 24: ...orted by PC TDR program generator CRBasic is included in PC400 or LoggerNet software The TDR200 CRBasic instruction is used to program the TDR200 Programming basics are provided in the following secti...

Page 25: ...ts filtering and averaging used to improve measurements in noisy environments and the algorithms used to calculate the measurements 8 1 TDR Principles The travel time for a pulsed electromagnetic sign...

Page 26: ...nding the waveguide the amplitude of the reflected voltage is dependent on electrical conduction of the applied signal between probe rods The presence of free ions in the soil solution causes attenuat...

Page 27: ...dielectric constant for a given cable length can improve accuracy Measurement precision at longer cable lengths will be maintained if the soil electrical conductivity does not prevent a reflection fr...

Page 28: ...ws data for solution with high electrical conductivity FIGURE 8 2 Waveforms collected in a sandy loam using CS610 probe with RG8 connecting cable Volumetric water content values are 0 10 0 16 0 18 0 2...

Page 29: ...lue two values prior to the point of interest the actual measured point of interest and the two values after that point Each of those points is weighted with the closer points having more weight than...

Page 30: ...re used for the reflected signal Each of these values are normalized by a value collected from inside the TDR200 A brief description of the algorithm is presented here 1 Begin at waveform data point 4...

Page 31: ...Processes 7 45 49 Ledieu J P De Ridder P De Clerck and S Dautrebande 1986 A method of measuring soil moisture by time domain reflectometry J Hydrol 88 319 328 Or D S B Jones J R Van Shaar S Humphries...

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Page 33: ...635 has 2 metre cable and a 3 metre window Public CS635_LaL Public CS635_VWC Public CS635_WaveFormValues 1013 Topp Equation Dielectric Constants const a0 0 053 const a1 0 0292 const a2 0 00055 Const a...

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Page 35: ...t Before using the Calibration Wizard physically connect all multiplexers and sensors the way they will be permanently deployed This will ensure that the Calibration Wizard determines all measurement...

Page 36: ...lighted region click on the highlighted area in the wizard window and move or scale the region to encompass the entire portion of the probe If it is difficult to find the probe or the probe was not en...

Page 37: ...be 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 4 F...

Page 38: ...sent 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 posi...

Page 39: ...pendix B Calibration Wizard Tutorial B 5 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 calibrate...

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Page 41: ...ommand list SVP Set Vp Value SNA Set Number of Averages SNP Set Number of Points SDI Set Distance Cable Length SWL Set Window Length SPL Set Probe Length SPO Set Probe Offset SCC Set Probe Cell Consta...

Page 42: ...The commands SVP SNA SNP SDI SWL SPL SPO SCC SREJ SFIL SLAA and SMUX require a parameter For these commands usage is of this form Command space ASCII parameter r n For example SPL 0 3 r n will set the...

Page 43: ...ses are returned by the sensor in response to commands that set a parameter in the device Ack responses begin with a CR and LF and are of the form r n space command For example the response to SPL 0 3...

Page 44: ...et Length Apparent Algorithm Usage SLAA space value r n range of value 0 2 Response r n space SLAA SMUX Set SDMX50 channel Usage SMUX space value r n value address 1 to 15 10 channel 1 to 8 Response r...

Page 45: ...an ASCII representation of a floating point value 4 decimal places GCO Acquire a new Waveform and return Electrical Conductivity value Usage GCO r n Response r n f ffff where f ffff is an ASCII repres...

Page 46: ...a Waveform Usage GWA r n Response r n NNNN space f ffff r n NNNN space f ffff r n NNNN space f ffff etc where NNNN is the 4 digit width point number and f ffff is an ASCII representation of the assoc...

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Page 48: ...cc Website www campbellsci cc France Location Vincennes France Phone 0033 0 1 56 45 15 20 Email info campbellsci fr Website www campbellsci fr Germany Location Bremen Germany Phone 49 0 421 460974 0...

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