Explanations on specifications:
Explanations on specifications:
Maximum permissible effective industrial bridge excitation voltage
A strain gage can be considered as a little heater, converting electrical energy intoheat. To prevent heating of the strain gage it is essential to choose a supply voltage
that is not excessively high. The maximum permissible bridge excitation voltage has
been computed for each strain gage and is specied in a table in this catalog.The specied excitation voltage always applies for the Wheatstone bridge as a whole.Only half the voltage may be applied to the individual strain gage. The maximum
values specied are permissible only for application on materials featuring excellent
heat conduction characteristics (e.g. steel of sufficient thickness). Strain gage measure-
ments on plastic materials, and similar materials with poor heat conduction characteri-
stics, require a reduction of the excitation voltage or switch-on period (impulse opera-
tion). Also with very low temperatures, the decreasing heat capacity of the materials
may require a smaller excitation voltage.
Reference temperature
The reference temperature is the ambient temperature to which the specications of
the strain gage refer, unless no specic temperature ranges have been stated.
The specications for the strain gages are based on the reference temperature of 23C.
Transverse sensitivity
The transverse sensitivity is the ratio of the sensitivity of a strain gage transverse to
the measuring grid direction to its sensitivity in the measuring grid direction. The
transverse sensitivity is stated on each strain gage package.
Schematic diagram of the transverse sensitivity of a
measuring grid 14Strain Gages and Accessories