TDR100

Name: TDR100
Brand: Campbell Scientific
SKU: 16594
Availability: Discontinued

Time-Domain Reflectometer

TDR100

Retired

Time-Domain Reflectometer

No longer available to order

This product is retained for service, documentation, and compatibility information.

Replaced by

TDR200
Time-Domain Reflectometer

Model:: TDR100
Item Number:: 16594
Warranty:: 1 year

Overview

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 data logger. 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.

Technical Description

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.

Benefits

Compact, low-cost reflectometer
Designed for use in remote applications
Determines volumetric water content and electrical conductivity in soil and other porous media
Compatible with CR800, CR850, CR1000, and CR3000 dataloggers

Specifications

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
Power Supply: Unregulated 12 V
(9.6 to 16 V)
300 mA maximum
Operating Temperature Range: -40° to +55°C
Pulse Generator Aberrations: ±5%
(within first 10 ns)
±0.5%
(after 10 ns)
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)

Waveform Sampling

-NOTE-: 20 to 2048 waveform values over chosen length

Distance is V_p=1. Time is one-way travel.
Range: -2 to 2100 m
(distance)
0 to 7 µs
(time)
Resolution: 1.8 mm
(distance)
6.1 ps
(time)

Current Drain

During Measurement: 270 mA
Sleep Mode: 20 mA
Standby Mode: 2 mA

Accessories

(1)

13770
TDR200/100 and SDM8X50/SDMX50 Interconnect Cable, 18 in.
Orderable

Other Accessories

(1)

13770
TDR200/100 and SDM8X50/SDMX50 Interconnect Cable, 18 in.
This cable connects the TDR100 to the SDMX50. The 13770 is shipped with the ENCTDR100.
Orderable

Replacement Parts

(3)

Compatibility

Data Logger Considerations

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.

Enclosure Considerations

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.