Product Information - TDR100
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Time Domain Reflectometer with PCTDR software
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 Brochure, Version Date: August 2011  Brochure
Manual, Version Date: February 2010  Manual

Download the current Operating System.
Download PCTDR software from our Download page.

Features

  • Compact, low-cost reflectometer
  • Designed for use in remote applications
  • Makes non-destructive, long-term, in-situ soil measurements
  • Determines volumetric water content and electrical conductivity in soil and other porous media
  • Can be used in rock-mass deformation applications
  • Provides measurement time of two seconds for water content, electrical conductivity or reflection waveform collection (250 data points)
  • Measures up to 512 TDR probes
  • Uses PCTDR software for quick and easy system setup
  • Communicates with SDMX50-series coaxial multiplexers using our SDM protocol
  • CR10X and CR23X dataloggers use Instruction 119 to control operation of the TDR100, supported in:
    • PC208W v 3.1 or higher
    • CR10X OS version 1 rev 13, currently shipping with TDR100
    • CR23X OS ver 1 rev 10, currently shipping with TDR100
  • Supports operating temperature range of -40° to 55°C

General Description

The TDR100 Time-Domain Reflectometer is the core of the Campbell Scientific Time Domain Reflectometry system. The TDR100 (1) generates a very short rise time electro-magnetic pulse that is applied to a coaxial system which includes a TDR probe for soil water measurements and (2) samples and digitizes the resulting reflection waveform for analysis or storage. The elapsed travel time and pulse reflection amplitude contain information used by the on-board processor to quickly and accurately determine soil volumetric water content, soil bulk electrical conductivity, rock mass deformation or user-specific, time-domain measurement.

Up to 16 TDR100s can be controlled using a single Campbell Scientific datalogger. A 250-point waveform is collected and analyzed in approximately two seconds. Each waveform can have up to 2,048 data points for monitoring long cable lengths used in rock mass deformation or slope stability. Averaging up to 128 makes accurate measurements possible in noisy environments.

PCTDR Windows Software

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  • Included with the TDR100
  • Displays the waveform during system setup and troubleshooting
  • Displays volumetric water content and electrical conductivity
  • Switches SDMX50 channels
  • Collects waveform and derivative data files
  • Determines probe constant values needed for electrical conductivity measurements

Suggested Reading

GeoMeasurements by Pulsing TDR Cables and Probes
 For information on the uses of Time Domain Reflectometry in Geotechnical applications, please consult GeoMeasurements by Pulsing TDR Cables and Probes by Kevin M. O'Connor and Charles H. Dowding.

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