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Home - Stress Analysis Strain Gages - Calculators - Errors Due to Leadwire Resistance: Leadwire Attenuation

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:


  = 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 .