The TDR100 Time-Domain Reflectometer is the core of the Campbell Scientific time-domain reflectometry system. This system is used to 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. PC-TDR software is used with our TDR100-based systems during system setup and troubleshooting. It can be downloaded from the Downloads section of the web page.Read More
The TDR100 (1) generates a short rise time electromagnetic pulse that is applied to a coaxial system that 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.
The data logger collects a 250-point waveform and analyzes it 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 readings makes accurate measurements possible in noisy environments.
|Pulse Generator Output||250 mV into 50 Ω|
|Output Impedance||50 Ω ±1%|
|Time Response of Combined Pulse Generator & Sampling Circuit||≤ 300 ps|
|Pulse Length||14 µs|
|Timing Resolution||12.2 ps|
|Waveform Averaging||1 to 128|
|Electrostatic Discharge Protection||Internal clamping|
Unregulated 12 V
(9.6 to 16 V)
300 mA maximum
|Operating Temperature Range||-40° to +55°C|
|Pulse Generator Aberrations||
|Dimensions||23.6 x 5.9 x 12.6 cm (9.3 x 2.3 x 5.0 in.)|
|Weight||726 g (1.6 lb)|
20 to 2048 waveform values over chosen length
Distance is Vp=1. Time is one-way travel.
|During Measurement||270 mA|
|Sleep Mode||20 mA|
|Standby Mode||2 mA|
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
To control the TDR100, the data logger uses TDR100 instruction in CRBasic or Instruction 119 in Edlog. All CR800-series, CR1000, and CR3000 operating systems (OS) are compatible with the TDR100. The CR10X operating system (OS) should be version 1 rev. 13 or higher and the CR23X OS should be version 1 rev. 10 or higher.
The TDR100 requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. The TDR100's case has mounting flanges for attachment to the 1 in.-on-center hole grid of Campbell Scientific enclosures.
Support software designed for the TDR200 and is also compatible with the retired TDR100 Time-Domain Reflectometer.
Number of FAQs related to TDR100: 19
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Theoretically, yes, this can be done. However, it is more common to use a second data logger both for resilience reasons and because there are advantages in keeping TDR cables short. It is best to distribute the systems across the test site rather than trying to centralize everything.
Yes. The data logger can be programmed to send commands to the TDR100 and to store the measurement results. A flag can be used in the program to initiate measurement and store these results.
These three multiplexers all use the same relay board, but the housing differs. The multiplexers are described side-by-side on page 2 of this brochure.
The most popular model is the SDMX50SP, followed by the SDMX50.
Campbell Scientific offers six soil probes that have different rods and connector cables, allowing them to be used in diverse soil types and with a variety of cable lengths. For more details, see the listed TDR100 probes.
The TDR100 ships with the items listed in the Ships With box on the right side of this page.
In addition, consider purchasing the ENCTDR100 TDR System Enclosure. This enclosure ships with many items necessary for a TDR100 Data Acquisition System. See the Ships With box on the right side of this page.
Yes. The data logger can be programmed to store time-series data from the TDR100. The time-series data can then be viewed using PC400 or LoggerNet. For program examples, see the TDR100 Instruction Manual.
Slope stability/rock mass deformation instrumentation is used to detect slope movement and rock mass deformation associated with landslide, mining, and construction activities. In many applications, the ground movement readings are processed by a data logger.
Application engineers at Campbell Scientific can provide a list of geotechnical system integrators who can offer guidance and/or support for TDR cable selection, installation, waveform interpretation, and alarm condition set points.
To understand the readings obtained from a data logger program, it is necessary to see how the TDR100 operates in PC-TDR. Either the TDR100 commands are entered in PC-TDR and the user waits to see the results, or the data logger sends the TDR100 commands and automatically stores the results.
Campbell Scientific suggests initially entering the TDR100 commands in PC-TDR and waiting for the results before writing a data logger program. This allows verification that the TDR100 is operating correctly in PC-TDR. After that has been verified, a data logger program can be created for the TDR100 that sends the commands and stores the results.