Spider DSA User’s Manual
218
The real power of full bridge installations is that the gages may be oriented to
accentuate one strain component while eliminating (or at least significantly
reducing) the effect of other components. This, of course, is not a light topic and
the serious practitioner is referred the many serious references in field including:
C.C. Perry and H. R. Lissner, The Strain Gage Primer, McGraw-Hill Book Company,
1962.Figure X13 illustrates four of the most common full bridge applications,
detecting bending, shear, axial and torsional stresses.
Figure x15: Selectively focusing upon a desired stress component with a full bridge
Remote Sensing
When a bridge or partial bridge is a long distance from the analysis hardware, the
resistance of the leads powering the bridge can cause a detectable voltage drop.
That is, the actual bridge excitation, V
in
, is less than the difference between EXC+
and EXC-. Hence, the calculated channel sensitivity, GF V
in
, will be erroneously
high. To correct this, the measured value of V
in
is used in the sensitivity
calculation.
To Next Page
Loading...