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Root Dendrometer
Campbell Data Logger (CR1000)
The dendrometer can be measured both in single-ended voltage as well as differential
voltage mode. Differential voltage mode provides better accuracy. But single-ended mode
requires half as many channels as differential mode. One CR1000 can include 16 den-
drometers in single-ended mode, but only 8 dendrometers in differential mode.
Single-ended Voltage Mode ( 2 dendrometers)
Connection
st
1
dendrometer
nd
2
dendrometer
Program Syntax
ExciteV (Vx1,2500,0)
VoltSe(SEVolt(),2,mV2500,1,True,0,_50Hz,Mult(),Offs())
If Multiplier=4.4, Offset=0, the results are measured in microns.
Differential Voltage Mode ( 2 dendrometers)
Connection
st
1
dendrometer
nd
2
dendrometer
Program Syntax
ExciteV (Vx1,2500,0)
VoltDiff(DiffVolt(),2,mV2500,1,True,0,_50Hz,Mult(),Offs())
If Multiplier=4.4, Offset=0, the results are measured in microns.
An interval 0.5-hour for data collection can reveal the diurnal course of diameter changes
very well.
6. Adjustment and maintenance
When the sensor is correctly installed, it will function without the need for further mainte-
nance.
Depending on the growth rate of the root, the sensor should be reset after some months
or years of measurements. When the output approaches 11 mm, the sensor needs to be
reset.
Cable Color
Yellow
Green
Brown
White
Yellow
Green
Brown
White
Cable Color
Yellow
Green
Brown
White
Yellow
Green
Brown
White
3
Input Port
1H
Ground
Vx1
Ground
1L
Ground
Vx1
Ground
Input Port
1H
1L
Vx1
Ground
2H
2L
Vx1
Ground
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