The standard test methods for determining various performance characteristics of strain gauges are covered in ASTM E251. 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 standard defines test methods for the evaluation of a strain gauge’s 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.
Video 01: Working, types, and applications of strain gauges
Results:
In ASTM E251, the results can be expressed numerically or graphically.
The gauge factor is dimensionless and is expressed as follows,
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