be recorded, the program usually combines several measurements into computational or
statistical summaries, such as averages and standard deviations.
1.1.3 Programs
A program directs the datalogger on how and when sensors are measured, calculations are
made, data is stored, and devices are controlled. The application program for the CR1000X is
written in CRBasic, a programming language that includes measurement, data processing, and
analysis routines, as well as the standard BASIC instruction set. For simple applications, Short Cut,
a user-friendly program generator, can be used to generate the program. For more demanding
programs, use the full featured CRBasic Editor.
1.2 Sensors
Sensors transduce phenomena into measurable electrical forms by modulating voltage, current,
resistance, status, or pulse output signals. Suitable sensors do this with accuracy and precision.
Smart sensors have internal measurement and processing components and simply output a
digital value in binary, hexadecimal, or ASCII character form.
Most electronic sensors, regardless of manufacturer, will interface with the datalogger. Some
sensors require external signal conditioning. The performance of some sensors is enhanced with
specialized input modules. The datalogger, sometimes with the assistance of various peripheral
devices, can measure or read nearly all electronic sensor output types.
The following list may not be comprehensive. A library of sensor manuals and application notes
is available at www.campbellsci.eu/support to assist in measuring many sensor types.
l Analogue
o
Voltage
o
Current
o
Strain
o
Thermocouple
o
Resistive bridge
l Pulse
o
High frequency
o
Switch-closure
o
Low-level ac
o
Quadrature
l Period average
l Vibrating wire (through interface modules)
1. Data acquisition system components 3
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