High Elongation Extensometers – Model 3800
Designed for rubber, elastomer and high-elongation plastics testing for strains from 100%-2000%ε. Their unique design allows testing to failure and minimizes interaction with the sample.
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38 EXTENSOMETER MODELS are available in many thousands of variations. Our focus on helping customers has led to the development of models to cover nearly any test method.
The main body of this unique extensometer remains stationary during testing, held in position by the adjustable magnetic base included. Only the very light, small traveling heads move as the sample elongates during a test. These attach to the sample with small spring clips. Each head pulls a cord out from the extensometer as the head moves.
These models use low friction potentiometers and have a range of factory-selectable outputs. The extensometer is driven by an excitation voltage and has output proportional to the input. They are provided with outputs that mimic strain gaged devices (2-4 mV/V). The Model 3800 can be used with virtually any signal conditioning electronics designed for strain gaged sensors. For systems lacking the required electronics, Epsilon can provide a variety of solutions for signal conditioning.
- May be left on through specimen failure.
- Applicable for testing to ASTM D412.
- The main body is stationary with only the lightweight traveling heads moving.
- Comes with an adjustable magnetic base for easy mounting.
- Large measuring range to 500 mm (20 inches).
- Includes the Epsilon Shunt Calibration System for on-site electrical calibration.
- Includes high quality foam lined case.
- Low cost strain measurement for testing high-elongation materials (>100%ε).
Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max.
Output: 2 to 4 mV/V, nominal; select at time of order
Accuracy: ±1 mm (±0.040 inches)
Resolution: 0.2 mm (0.008 inches)
Temperature Range: -40 °C to 100 °C (-40 °F to 210 °F)
Cable: Integral, ultra-flexible cable, 2.5 m (8 ft) standard
Operating Force: <200 grams typical per head
- Adapter kits to change gauge lengths.
- Connectors to interface to nearly any brand of test equipment.
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Model 3800 with mounting stand
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Specimen attachment with Model 3800
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Model 3800 with mounting stand
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Specimen attachment with Model 3800
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Model 3800 with mounting stand
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Specimen attachment with Model 3800
Product Videos
Ordering Information
Click table options to configure
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pGauge Length
Selecting Extensometer Gauge Length
Extensometer Gauge Length is the distance between the extensometer’s initial measuring points on the specimen. If you are using a testing standard, check the standard for extensometer gauge length requirements. Many test standards specify the specimen dimensions and a matching extensometer gauge length.
Many specimens have a reduced section length that is designed to be greater than the extensometer’s gauge length.
| mm or inches | # |
|---|---|
| 20.0 mm | -020M |
| 25.0 mm | -025M |
| 50.0 mm | -050M |
| 1.000 in | -0100 |
| 2.000 in | -0200 |
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pMeasuring Range
Selecting Extensometer Measuring Range
Measuring Range is the measuring capacity of the extensometer in tension (+) or compression (-) in units of % strain, maximum extension, or maximum deflection. When measuring range is in units of % strain, this means the maximum extension as a percentage of the gauge length.
Estimate the maximum strain or extension values you will need to measure, such as the total strain when the extensometer is removed after offset yield or the elongation at fracture. Then select a measuring range for the extensometer that meets or exceeds the requirements for the materials you are testing. If you are using a testing standard, also check the standard for extensometer requirements.
| extension | # |
|---|---|
| +250 mm | -250M |
| +500 mm | -500M |
| +10.0″ | -100T |
| +20.0″ | -200T |
Selected Tensile Measuring Range: _ _ _ _
Example: 3800-0100-100T: 1.0 inch gauge length, +10 inches measuring range (+1000% strain), temperature range of -40 °F to 210 °F
Related Models
Repairs/Service
If your unit is in need of service, calibration or repair, initiate the RMA process with us and we will be happy to assist.
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