3575AVG Sheet Metal r-Value Extensometers Designed for Measuring r-Values in Sheet Metal Testing

The 3575 AVG extensometers from Epsilon are designed for measuring r-values in sheet metal testing, and average the lateral strain at two locations. These extensometers can be used simultaneously with the Model 3542 axial extensometer.

The 3575 AVG extensometer is self-supporting on the sample and has rounded contact edges which measure the sample at two locations. When the test sample is pulled, the contact edges follow the part of the sample that they were mounted on, and measures lateral strain on the sample at the same location during the entire test. The extensometer has one output, which is the average of the two lateral measurements.

These extensometers can be used with a 50 mm or 2” gauge length Model 3542 extensometer, which measures the axial strain.

The 3575AVG extensometers are strain gaged devices, and this makes them compatible with any electronics designed for strain gaged transducers. Often, they are connected to a test machine controller. The signal conditioning electronics for the extensometer is usually included with the test machine controller or may often be added.

In this case, the extensometer is delivered with the right wiring and connector to plug directly into the electronics. Epsilon can offer a range of solutions for systems that do not have the required electronics. This enables the extensometer output to be connected to chart recorders, data acquisition boards or other equipment.

Epsilon extensometers are compatible with almost every brand of test equipment and can be supplied with the right connector to plug in directly, or supplied with a separate conditioner and amplifier.

Epsilon has 20+ years history of service for the materials testing community, and will be there to stand behind their products when the user’s critical application requires it.

The company provides 36 Extensometer models in thousands of variations and their focus on helping customers has led to the development of models to cover virtually any test method.


The key features of the Model 3575AVG extensometers are as follows:

  • Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system
  • May be left on through specimen failure
  • All standard units have linearity readings of 0.15% or better
  • Rugged, dual flexure design for strength and better performance. Much stronger than single flexure designs
  • High quality foam lined case and spare set of tool steel knife edges are provided
  • Measuring range of 2 mm or 0.075” (specify when ordering)
  • Self-supporting on the specimen
  • Single clip-on unit directly measures lateral strain as an average of two locations
  • Greatly accelerates testing and allows digital data collection compared to manual measurements


The key specifications of the Model 3575AVG extensometers are as follows:

  • Excitation: 5 to 10 VDC recommended, 12 VDC or VAC maximum
  • Output: 2 to 4 mV/V, nominal, depending on model
  • Temperature range: Standard (-ST) is -40 °C to +100 °C (-40 °F to 210 °F)
  • Linearity: ≤0.15% of full scale measuring range
  • Specimen size: Works with samples 9.5 to 25 mm (0.375” to 1.0”) width
  • Cable: Integral, ultra-flexible cable, 2.5 m (8 ft) standard


The following are the options available with the Model 3575AVG extensometers:

  • Specialty knife edges
  • Connectors to interface to virtually any brand test equipment
  • Shunt calibration

3575AVG Sheet Metal r-Value Extensometers Designed for Measuring r-Values in Sheet Metal Testing


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