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Leadwire Attenuation
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Errors Due to Leadwire Resistance |
The resistance of leadwires in series with an
active strain gage attenuates the bridge output (or
"desensitizes" the gage) by the factor:
where: 
= total resistance of leadwires in series with the
gage (two lengths of leadwire for a two-wire-circuit,
and one length for a three-wire circuit)
= gage resistance.
The error, e , caused by leadwire resistance can be expressed as: 
When the leadwire resistance is known , indicated strains can be corrected for leadwire effects by multiplying the strains by: 
As an alternative to correcting the data numerically, the gage factor of the strain indicator can be adjusted from its original value, 
, to a new, compensating value,
, where
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