Campbell TDR100 Manuel d'instructions télécharger pdf (Page 18)

TDR100

LoggerNet (version 3.0 or higher) are used to create and send the CRBasic

Program to the CR1000 datalogger.

5.3 TDR100

The TDR100 contains the pulse generator for the signal applied to a TDR

probe. The TDR100 also digitizes the reflection and applies numerical

algorithms for measuring volumetric water content or electrical conductivity.

The TDR100 communicates with the datalogger using SDM protocol or with a

computer using PCTDR and serial communications.

5.4 Power Supply

The system operates on 12 V power. A user supplied deep cycle 12 V lead

acid battery is commonly used in remote installations. Two terminal strip

adapters for the battery posts are provided with the ENCTDR100 (see Figure

5-2). These terminal strips will mount to wing nut battery posts found on most

deep cycle lead acid batteries. Installations with AC power available should

use it to continuously charge the system battery. Remote installation without

AC power should keep the battery charged with an SP10R or SP20R solar

panel. See the applications note at

ftp://ftp.campbellsci.com/pub/outgoing/apnotes/pow-sup.pdf for discussion of

power supplies.

FIGURE 5-2. Terminal Strip Adapters for Connections to Battery

Campbell Scientific recommends using datalogger switched 12 volts to power

the TDR100. This will provide power savings and will automatically reset the

TDR100 and provide automatic recovery from system malfunctions. This

practice can reduce loss of measurement data when a problem exists.

Typically the switched 12 volts is turned on at the beginning of the datalogger

program table that contains the TDR measurement instructions, and it is turned

off at the end of the table. CR10X and CR23X datalogger Instruction 86 can

be used to set a control port for the switched 12 volt power. PC208W or

LoggerNet HELP provide guidance for controlling switched 12 volts with both

the CR10X and CR23X. See datalogger programming example 1 in program

example section of this manual. CRBasic Instruction “SW12” can be used to

switch 12 volt power on the CR1000 datalogger. See programming example 6

in the program example section of this manual.

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Campbell TDR100 Manuel d'instructions Page 18