Campbell 109, Инструкция по эксплуатации, Страница: 13 / 30

Model 109 Temperature Probe
5
7.1 Wiring to Datalogger
TABLE 7-1. Wire Color, Function, and Datalogger Connection
Wire Color Wire Function
Datalogger Connection
Terminal
Black Voltage-excitation input
U configured for voltage
excitation
1
, EX , VX
( voltage excitation)
Red Analog-voltage output
U configured for single-ended
analog input 1 , SE
(single-ended,
analog-voltage input)
Purple Bridge-resistor lead
⏚
(analog ground)
Clear EMF shield
⏚
(analog ground)
1
U channels are automatically configured by the measurement instruction.
7.2 Datalogger Programming
Short Cut is the best source for up-to-date datalogger programming code.
If your data acquisition requirements are simple, you can probably create and
maintain a datalogger program exclusively with Short Cut . If your data
acquisition needs are more complex, the files that Short Cut creates are a great
source for programming code to start a new program or add to an existing
custom program.
Short Cut cannot edit programs after they are imported and edited
in CRBasic Editor .
A
Short Cut
tutorial is available in Section 4 ,
QuickStart
(p. 1)
. If you wish to
import Short Cut code into CRBasic Editor to create or add to a customized
program, follow the procedure in Appendix A , Importing Short Cut Code Into
CRBasic Editor
(p. A-1)
. Programming basics are provided in the following
section. A complete program example can be found in Appendix B ,
Example
Programs
(p. B-1)
.
If the 109 probe is to be used with long cable lengths or in electrically noisy
environments, consider employing the measurement programming techniques
outlined in Section 8.3 ,
Electrically Noisy Environments
(p. 9)
, and Section 8.4 ,
Long Cable Lengths
(p. 9)
.
Details of 109 probe measurement and linearization of the thermistor output
are provided in Section 8.2 , Measurement and Output Linearization
(p. 8)
.
7.2.1 Therm109() Instruction
The Therm109() measurement instruction programs CRBasic dataloggers to
measure the 109 probe. It applies a precise excitation voltage, makes a half-
bridge resistance measurement, and converts the result to temperature using the
NOTE