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M-300 Automatic Extensometer
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M-300 Automatic Extensometer
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Description:
The Instron M300 is suitable for almost all samples of a gauge length (Lo) from 10 mm (0.39 in) to 200 mm (7.87 in). Its low clamping forces combined with high measurement accuracy makes it highly suitable for testing a wide range of specimens from Rebar to small, notch sensitive test samples. The M300 can be connected to partly or fully automatic testing machines even those using hydraulic grips. The strain can be measured from the elastic range to fracture for many types of samples.
Note: To prevent potential damage to the arms, the M300 extensometer should be unclamped from the specimen prior to break if the specimen exhibits violent fracture characteristics (i.e. high strength rebar, composites, rock, and other materials that release large amounts of energy at break or fragment at break).
Each one of the four measuring arms of the M300 has a strain-gauged spring that detects motion of the specimen. The springs of a right and left arm pair are connected in parallel to obtain an average value, which is important if the sample deforms non homogeneously. This signal is used to drive DC Tachomotors that make the arms follow the specimen. This ensures that the measuring heads move according to the sample elongation as well as follow the sample extension. The elongation is recorded by an opto-incremental measuring system. The measuring heads mounted on the measuring arms show an exact parallel movement which is achieved through a zero-backlash linear guidance system. By using this principle, errors are avoided, which occur for measuring sensors with fixed points of rotation through angle changes and also errors, due to tilting of the knife edges on the sample. The measuring heads and arms can be separated from the linear guidance system as well as changed easily and quickly. It is possible to change the arms by just one screw fitting, ensuring the simplicity of maintenance.
The M300 is controlled through an integrated electronic unit (included in price). It is a fully automatic control which can be connected to a microcomputer via a serial interface (RS 232). All movements can be initiated at any time. The measuring arms can be positioned in parallel, within the available measuring range, under computer control and thus are quickly adjusted symmetrically to the desired gauge length. The gauge length (Lo) can be set from 10 mm (0.39 in) to a maximum of 200 mm (7.87 in). The travel is calculated from the measurement range of 300 mm (11.81 in) minus gauge length. The M300 has an additional positioning range of 190 mm (7.48 in) for the symmetrical adjustment of Lo.
The arms can be opened and closed at any time, but must open before approaching the required measurement position. The digital measurement system is calibrated using reference marks before approaching the measuring position.
An RS 232 Interface (V24) is used for sending commands and transfer data. It connects the computer to the M300 Electronic unit. The M300 interface can be configured up to 19400 baud and can be connected to virtually all computers with an RS 232.
Advantages of the M300:
- Folding bellows alongside the casing protect the
measuring system and the parallel guide against any
foreign particles.
- The round knife-edges can be utilized along their entire
perimeter by turning them.
- The Lo position (symmetrically placed measuring arms
with respect to the sample centre) and Lo value can be
exactly set under computer control.
- Very low clamping forces even allow testing of foils and
thin wires.
- Customer selectable very high resolution of 0.1 µm (3.937 E -06 in) or 1 µm (3.937 E -05 in) on each instrument.
Precise Measurement:
The opto-incremental scale is directly connected with the lower measuring arm, moving together towards the start position during the measurement, only the upper measuring arm can be moved relative to the glass scale. Therefore the measured value by the electronic is equivalent to the direct data value output, as it describes the elongation difference to the lower arm
Technical Data:
Accuracy Class: EN 10002 0.5 (ASTM E83 B-2)
Measurement principle: opto-incremental
Travel: 300 mm/min (11.81 in/min) Lo
Gauge Length (Lo): from 10 mm (0.39 in) to
200 mm (7.87 in)
Indication error (rel): 0.5%
Indication error: 1.5 µm (0.000059 in)
Error in full range value 0.010%
Error in Linearity: 0.005%
Error in gauge length (Lo) +/- 0.5%
Resolution: 0.1 µm (0.0000039 in) or 1 µm (0.000039 in)
Activating force: < 0.01 N
Clamping force: 0.25 N
Operating temperature range: 0 to + 50 Degrees C
(+32 to +122 Degrees F)
Weight: approx. 30 kg (66 lb)
Sample Dimensions:
Flat Specimens:
Maximum sample thickness: 30 mm (1.18 in)
Maximum sample width: 50 mm (1.97 in)
Round Specimens:
Maximum sample diameter 80 mm (3.15 in)
Notes:
Factory pre-shipment verification performed at 25mm
(1") gauge length and 100% travel. Additional calibration points quoted upon request.
Configuration notes:
1. M300 requires controller to be configured with an additional digital channel (cat #W-5527, not included/purchased separately).
2. Mounting kits not included/purchased separately (see cat # W-6011
3. M300 is currently only offered as being compatible with Partner software.
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Specifications:
| Gauge Length | 10 - 200 mm
(0.39 - 7.87 in) |
| Travel (Axial) | 300 mm
(11.81 in) |
| Specimen Width | 0 - 50 mm
(0 - 1.97 in) |
| Specimen Thickness | 0 - 30 mm
(0 - 1.18 in) |
| Specimen Diameter | 0 - 80 mm
(0 - 3.15 in) |
| Temperature Rating | 0 to +50 °C
(+32 to +122 °F) |
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M-300 Automatic Extensometer
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