Data loggers are designed to measure static strain, a phenomenon
where the subject strain does not change at all or slowly changes.
As seen in load tests of largescale structures, static strain is often
measured in several hundred channels and under dozens of load
conditions.
Data loggers are available in 2 types: stand-alone and PC-controlled.
Both are oriented to automatic multichannel measurement as
intelligent, expansible systems. A data logger can stably measure
microvolt signals in strain/stress measurement indoors and outdoors.
Besides that advantage, some recently developed data loggers have
a processing capability incorporated into the portable package.
Advancements in electronic components, progress in
multimedia in information-related fields and downsizing
of equipment have generated the following demands:
-Simultaneous measurement of various static variables
including strain/stress, load, pressure, acceleration, displacement,
torque, voltage and temperature
-Visual presentation of the progressive status of measurement and
function that enables smooth progression of measurement while
accepting the engineer's judgment.
-Unattended measurement
-More compact and lightweight design
-Capability to measure not only static phenomena but
also events changing at a frequency of several Hz
-Efficient measurement and data collection through
Internet or Ethernet LAN