Model 3975 Extensometer for Diametral Rock and Concrete Testing

Product catalog summary

Overview: The document describes the Model 3975 diametral extensometer, designed for precise measurement of small diametral strains, particularly for determining Poisson’s ratio in materials like rock, concrete, and asphalt. It is compatible with the Model 3542RA axial averaging extensometer and is self-supporting on test samples.

Specifications:

Excitation: Recommended 5 to 10 VDC, maximum 12 VDC or VAC.
Output: Nominal 2 to 4 mV/V, depending on the model.
Linearity: ≤0.20% of full-scale measuring range.
Temperature Range: -40 °C to +100 °C (-40 °F to +210 °F).
Cable: 8 ft (2.5 m) ultra-flexible cable.

Features:

Full bridge, 350 ohm strain gaged design for broad compatibility.
Meets ASTM class B-1 and ISO 9513, class 0.5 accuracy standards.
Rugged dual flexure design for enhanced performance.
Easy mounting with integral springs, self-supporting on specimens.

Options: Connectors for various test equipment and a shunt calibration module are available.

Applications: Ideal for small diametral strains in large compression samples. The Model 3975 is recommended for low strain measurements, while the Model 3544 is suggested for large strain measurements.

Ordering Information: The Model 3975 is available in different measuring ranges, such as +0.030” (0.76 mm), +0.060” (1.50 mm), and +0.080” (2.00 mm).

Catalog excerpts

Model 3975 Extensometer for Diametral Rock and Concrete Testing-1

Model 3975 Available Versions: Consult factory for additional ranges. Measuring Range S PECIFICATIONS Example: 3975-0008: +0.080 inches (2.00 mm)measuring range Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max. > Model 3975 diametral extensometer Output: 2 to 4 mV/V nominal, depending on model > Linearity: Ңɤ 0.20% of full scale measuring range, dependingon model Temperature Range: Standard is -40 C to +100 аC (-40 F to +210 аF) Cable: Integral, ultra-flexible cable, 8 ft (2.5 m) standard > O PTIONS Connectors to interface to nearly any brand test equipmentShunt calibration module (see page 96) > 202.97.998.93226.7 1.9148.4 Contact Epsilon for your special testing requirements. TYPICAL MODEL 3975 DIMENSIONS:[mm] inches

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