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| Extensometers |
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| Revised: Feb. 3, 2002 |
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| The EXT series of extensometers available from ATM include models for testing a wide range of materials including metals, plastics, composites and ceramics. Their designs incorporate a dual flexural arrangement which makes them very rugged and insensitive to vibrations. Many models are designed for application in both tension and compression. |
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| 1) General Purpose EXT3542 Series |
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| Figure 1 shows a model from the EXT3542 series which are the standard series available from ATM. The 3542 series are a general purpose type of extensometer for axial tensile, compression, and cyclic testing. Gage lengths are available from 0.50 - 2.0" (10 - 50 mm) and with travel ranges from 5 -100% of gage length. These models come standard with a Quick Attach Kit also shown in Figure 1 which makes it easy to mount the extensometer on the test specimen in seconds. The extensometer can also be mounted with the included springs or elastic bands. |
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| The EXT3542 extensometers are full Wheatstone bridge strain gage type of devices which are directly compatible with the computer controlled ATM series of tensile/compression testing machines such as the bench mounted TTS series and the floor mounted D series. The extensometer usually uses the second DC conditioner amplifier included with these machines. The standard temperature range of the EXT3542 series is from -40 C - 100 C (-40 F - 210 F). |
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| Major Features of the EXT3542 Series: |
| - may be left on through specimen failure. |
| - high accuracy with some models offering 0.1% linearity. |
| - all models have travel in both tension and compression and can be used |
| for cyclic testing. |
| - rugged, dual flexure design for improved performance. |
| - mechanical overtravel stops in both directions. |
| - replaceable arms and spacers for ease of repair. This also allows |
| changing the gage length for different test requirements. |
| - all units meet existing ASTM and ISO requirements for accuracy. All will |
| meet ASTM class B-1, except for the longest travel units, which meet class |
| B-2. All meet ISO 9513, class 0,5. |
| - hardened tool steel knife edges are easily replaced. A spare set comes |
| with each extensometer. |
| - standard Quick Attach Kit for quick, one hand mounting to specimens. |
| Works for both flat and round samples (flats to 0.5 x 1.0" (12 x 25 mm) and |
| rounds up to 1 " (25 mm) diameter). Optional arms available for larger |
| samples. |
| - includes high quality foam lined case. |
| - high and low temperature options extend operation from as low |
| as -265 C (-450 F) up to 175 C (350 F). |
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| Specifications: |
| Sensor: Full Wheatstone strain gaged bridge design |
| Output: 2 - 4 mV/V, nominal |
| Excitation: 10 VDC typical, up to 15 VDC or VAC max |
| Temperature range: Standard is -40 C (-40F) up to 175 C (350 F) |
| Cable: Integral ultra flexible cable, 8 ft (2.5 m) |
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| Ordering Information: |
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| Model Number: EXT3542 - abcd - efg - hjk |
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| where abcd is the extensometer Gage length as follows: |
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| Gage Length, " abcd Gage Length, mm abcd |
| 0.500 0050 10.0 010M |
| 0.640 0064 25.0 025M |
| 1.000 0100 50.0 050M |
| 1.400 0140 80.0 080M |
| 2.000 0200 |
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| where efg is the extensometer travel length as follows: |
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| Travel as % of Gage Length efg Linearity % |
| +/- 5 005 0.10 |
| +/- 10 010 0.10 |
| +/- 20 020 0.15 |
| +/- 25 025 0.15 |
| + 50 / -10 050 0.15 |
| +100 / -5 100 0.15 |
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| where hj is the Temperature Range as follows: |
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| hjk Temperature Range |
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| LT Low -265 C to 100 C (-450 F to 210 F) |
| ST Std -40 C to 100 C (-40 F to 210 F) |
| HT1 High -40 C to 150 C (-40 F to 300 F) |
| HT2 High -40 C to 175 C (-40 F to 350 F) |
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| Figure 2 shows the dimensions of the different gage lengths of the EXT3542 series of extensometers. |
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| 2) Other Extensometer Series |
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| In addition to the EXT3542 series, ATM has available other types of extensometers for applications which cannot be accommodated by the standard models in the EXT3542 series. Please contact ATM for information on these other products. |
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