29May/104
Why are Wheatstone bridges used for strain gauge measurements?
Why not just measure the resistance across the strain gauge? Especially if using only one strain gauge... ?
Why not just measure the resistance across the strain gauge? Especially if using only one strain gauge... ?
May 29th, 2010 - 08:32
Just measure the resistance with ordinary resistance measuring instrument you mean? Wheatstone bridges are very precise instruments and more capable for measuring very little resistances which can be neglegible in ordinary applications.
May 29th, 2010 - 08:59
Wheatstone bridges are very sensitive to small changes in resistance, which makes them better suited for strain gauge measurements since the changes in resistance across the strain gauge are small.
May 29th, 2010 - 09:30
It’s a difference-measurement, which is a simple, low cost way to compensate for offset, temperature and batch variations, etc.
May 29th, 2010 - 10:03
Because the change in resistance of the strain gauge is too small for normal Ohm meters to measure. Plus, this would be less accurate.