The standard test methods for determining various performance characteristics of strain gauge are covered in ASTM E251-92. These test methods provide the information that must accompany strain gauges if they are to be used with acceptable accuracy of measurement.
Scope:
The ASTM E251-92 standard defines test methods for the evaluation of strain gauge performance characteristics. This standard includes testing equipment designs. Standard test methods E251 describes procedures for determining five strain gauge parameters:
| Parameter | Section |
| Resistance at a Reference Temperature | 8 |
| Gauge factor at a Reference Temperature | 9 |
| Temperature Coefficient of Gauge Factor | 10 |
| Transverse Sensitivity | 11 |
| Thermal Output | 12 |
These test methods do not cover bonded resistance strain gauges used in transducers as sensing elements.
Results:
The results can be expressed numerically or graphically.
The gauge factor is dimensionless and is expressed as follows,
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