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TDR100

Entering these constants as the multiplier when using Instruction 119 for

electrical conductivity measurement will give units of Siemens/meter.

For example, when using a CS600 the value 3.16 can be entered into parameter

12 of Instruction 119 and the electrical conductivity value in Siemens per

meter will be written to the input location specified in parameter 11.

6.3 CR1000 Datalogger Instruction “TDR100”

The TDR100 instruction is used to measure one or more time domain

reflectivity (TDR) probes attached to a TDR100 device.

Syntax

TDR100 ( Dest, SDMAddress, Option, Mux/ProbeSelect, WaveAvg, Vp,

Points, CableLength, WindowLength, ProbeLength, ProbeOffset, Mult, Offset

Remarks

This instruction can be used to measure one TDR probe connected to the

TDR100 directly or multiple TDR probes connected to one or more SDMX50

multiplexers.

Dest: The Dest parameter is a variable or variable array in which to store the

results of the measurement. The variable must be dimensioned to accommodate

all of the values returned by the instruction, which is determined by the Option

parameter.

SDMAddress: The SDMAddress parameter defines the address of the

TDR100 with which to communicate. Valid SDM addresses are 0 through 14.

Address 15 is reserved for the SDMTrigger instruction. If the Reps parameter

is greater than 1, the datalogger will increment the SDM address for each

subsequent TDR100 that it communicates with.

CRBasic dataloggers use base 10 when addressing SDM devices.

Edlog programmed dataloggers (e.g., CR10X, CR23X) used

base 4 for addressing.

Option: The Option parameter determines the output of the instruction.

Code

Description

0 Measure La/L (ratio of apparent to physical probe rod length)

1 Collect Waveform values - Outputs reflection waveform values as an

array of floating point numbers with a range of -1 to 1. The

waveform values are prefaced by a header containing values of key

parameters for this instruction (averaging, propagation velocity,

points, cable length, window length, probe length, probe offset,

multiplier, offset)

2 Collect Waveform plus First Derivative - Returns (2*n-5)+9 values

where n is the number of waveform reflection values specified by the

Points parameter.

3 Measure Electrical Conductivity - Outputs a value that when

multiplied by the Multiplier parameter determines soil bulk electrical

conductivity in S/m.

NOTE

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 55 56

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Campbell TDR100 Manuale delle Istruzioni Pagina 30

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