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TDR 100

Soil Moisture Meter

PRODUCT MANUAL

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Summary of Contents for TDR 100

Page 1: ...TDR 100 Soil Moisture Meter PRODUCT MANUAL...

Page 2: ...Mode 6 Relative Water Content Mode 8 Identifying the Correct Com Port 9 Connecting to a PC Changing Batteries 10 Main Toolbar 11 Meter Settings 12 Meter Calibration 14 Specifications 15 Appendix 1 Soi...

Page 3: ...omain reflec tometry is a proven technology for quickly and accurately determining volumetric water content VWC in soil The Field Scout probe allows the user to easily and rapid ly take many measureme...

Page 4: ...ter is turned on it will display the battery status for 3 seconds The screen will then display the most recently used MODE screen Volumetric or Relative water content or measurement period The data sc...

Page 5: ...water con tent VWC or RWC readings the rod length setting must be correct In the VWC modes the currently selected rod length appears in the lower left corner of the LCD screen The options are Turf 1...

Page 6: ...y TDR is an average over the length of the waveguide Electronics in the TDR 300 generate and sense the return of a high energy signal that travels down and back through the soil along the waveguide co...

Page 7: ...he chances the rods will be bent or broken Likewise it is best to avoid areas with rocks or other material that can cause the rods to deflect or bend Stndrd VWC 25 5 PL L N 06 A 23 4 The TDR meter can...

Page 8: ...negative RWC or an RWC greater than 100 If the volumetric water contents for field capacity and permanent wilting point are the wet and dry set points respec tively the RWC value will be equivalent t...

Page 9: ...tested and click the Port Test button Click the Test Port Now button If the message Connection OK is displayed another device such as a modem is probably connected to that port If the message No Conn...

Page 10: ...to the meter s serial port The meter s con figuration can be modified by clicking on the Meter Set tings button see Meter Settings p 12 The Com Port Meter Type and Clear Meter Settings buttons are ex...

Page 11: ...ntify ing the Correct Com Port p 14 for instructions on how to determine which port to select Meter Type Select the TDR option from the list of available Field Scout meters Meter Settings Click this b...

Page 12: ...are also entered here The fields are described below Meter Name The name given the meter will be the title on the first line of the downloaded text file Units When operating the meter in Relative Wat...

Page 13: ...m of the screen select which VWC calibration Standard or High Clay should be used for each RWC mode Each of these modes can be given a descriptive name of 5 characters These names can be used to ident...

Page 14: ...meters can be used interchangeably The calibration procedure is as follows 1 Use the MODE button to put meter in Calibration mode see p 5 Hit the READ button 2 Hold the meter so the rods are in the a...

Page 15: ...ay 16 character 2 line LCD Weight 1 5 lbs 0 68 kg Probe Head Dimensions 3 1 x 3 x 1 7 8cm x 7 5cm x 2 5cm Rod Dimensions Length 1 5 3 8cm 3 7 6cm 4 7 12cm or 7 9 20cm Diameter 0 2 0 5cm Spacing 1 3 3...

Page 16: ...gradually wetting a known volume soil with the addition of known increments of water In most cases however the calibra tion will be done with gravimetric sampling This proce dure is briefly described...

Page 17: ...he gravimetric water content and soil bulk density VWC GWC b w Where GWC is the gravimetric water content and b is the bulk density GWC 100 Mwet Mdry Mdry b Mdry Vtot The final step is to plot the cal...

Page 18: ...s can be taken in three standard environ ments air distilled water and playground sand saturated with distilled water It is important that any troubleshooting be done with distilled wa ter Readings ta...

Page 19: ...etting VWC values near 0 for all measurements even in very wet soil Most likely a circuit component in the display is damaged and must be repaired Contact Spectrum Technologies or your dis tributor to...

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