Specifications

Section 2. Quickstart Tutorial
2-11
Historical Note:
In the space race era, a field thermocouple measurement was a complicated and
cumbersome process incorporating thermocouple wire with three junctions, a
micro-volt meter, a vacuum flask filled with an ice slurry, and a thick reference
book. One thermocouple junction connected to the μV meter, another sat in the
vacuum flask, and the third was inserted into the location of the temperature of
interest. When things settled out, the micro-volt meter was read, and the value
looked up in the appropriate table in the reference book to determine the
temperature. Then along came Eric and Evan Campbell. Campbell Scientific
designed the first CR7 datalogger to make thermocouple measurements
without the need of vacuum flasks, third junctions, or reference books. Now,
there’s an idea!
Nowadays, a thermocouple consist of two wires of dissimilar metals, such as
copper and constantan, joined at one end. The joined end is the measurement
junction; the junction that is created when the thermocouple is wired to the
CR1000 is the reference junction.
When the two junctions are at different temperatures, a voltage proportional to
the temperature difference is induced into the wires. The thermocouple
measurement requires the reference junction temperature to calculate the
measurement junction temperature using proprietary algorithms in the CR1000
operating system.
Objective: Program the CR1000 to accomplish the following tasks.
Every one second, measure air temperature in degrees C with a type T
thermocouple and store one-minute average battery voltage, panel temperature,
and thermocouple temperature.
Procedure:
Click on the Short Cut button in the upper right of the PC200W window to
open Short Cut as shown in FIGURE 2.2-3.
FIGURE 2.2-3. Short Cut “1. New/Open” Page