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TDR100

Example 4, Measure and Record; Analog Measurements and Volumetric

Water Content

In this example analog measurements are made every 5 minutes and TDR100

measurements are made every 60 minutes. Twenty-nine CS605 or CS610

probes are connected to 4 SDMX50 multiplexers (Figure 9-1). The cable

length values were determined using PCTDR. The La/L value is converted to

volumetric water content using the linear calibration function of Ledieu, etal.

(1986). The program is executed every 5 minutes. The array id, time, average

of the analog measurements and the volumetric water content measurement are

output to Final Storage once an hour.

;{CR10X}

;Program = T100EX#4

*Table 1 Program

01: 300 Execution Interval (seconds)

;Every 5 minutes (300 second execution interval)

;Measure the datalogger power supply voltage:

1: Batt Voltage (P10)

1: 1 Loc [ Bat_Volt ]

;Measure the internal temperature of the datalogger:

2: Internal Temperature (P17)

1: 2 Loc [ DL_Temp ]

;Once an hour on the hour (0 minutes into a 60 minute interval)

;Measure the TDR probes:

3: If time is (P92)

1: 0 Minutes (Seconds --) into a

2: 60 Interval (same units as above)

3: 30 Then Do

;Set port 5 high to switch ON "Switched 12V" power from the datalogger to power the TDR100.

4: Do (P86)

1: 45 Set Port 5 High

;Measure the 6 CS610 probes connected to the Level 1 SDMX50

;(Channels 3 to 8) and convert to water content:

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 55 56

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Campbell TDR100 Bedienerhandbuch Seite 45