TDR200-Based Time-Domain Reflectometry System
7
series, CR1000X, CR1000, and CR3000, which use the
TDR200()
CRBasic
instruction.
PC-TDR
software includes a Calibration Wizard, displays
waveform information, troubleshoots the reflectometer, and generates a
CRBasic program.
Software developers can customize the user interface using
information provided in Appendix
A TDR system consisting of a data logger, TDR200, SDM8X50 multiplexers,
12 V power supply, weatherproof enclosure, and solar panel is used to get
automated measurements at prescribed time intervals. A single TDR probe can
be connected directly to the TDR200 or multiple probes connected using
SDM8X50 coaxial multiplexers.
For field applications, the ENCTDR100 enclosure is recommended. The
ENCTDR100 is a white, fiberglass reinforced enclosure that protects 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 reflectometers
•
Makes non-destructive, long-term, in-situ soil measurements
•
Provides measurement time of 2 s for water content, electrical
conductivity or reflection waveform collection (250 data points)
•
Measures up to 512 TDR probes
•
Uses
PC-TDR
software to facilitate system setup
•
Compatible with Campbell Scientific CRBasic data loggers: CR6
series, CR800 series, CR1000, and CR3000
PC-TDR
3.0 requirements:
Runs on Windows 10, 8, 7, and Vista
Compliance information:
View EU Declaration of Conformity
documentation at:
6.1 TDR200 Performance
Pulse generator output:
Output impedance:
Time response of combined pulse
generator and sampling circuit:
Pulse generator aberrations:
Pulse length:
Operating frequency:
250 mV into 50 ohms
50
Ω
±
1%
≤
85 ps
± 16% within first 1 ns;
± 1% after 1 ns
25.5 µs
Band centred around 11.75 GHz
NOTE