These units are compatible with materials testing furnaces or induction heating systems and is available with high purity alumina rods for testing up to 1200°C and silicon carbide rods for temperatures up to 1600°C.
All 7650A models can be mounted rigidly on the load frame and incorporate slide mounting to bring the extensometer into contact with the specimen.
The gauge length is set automatically before mounting on the test specimen, which allows for hot mounting after thermal equilibrium has been reached.

The 7650A series is specifically designed to provide high accuracy, high resolution measurements and perform high temperature fatigue testing at the highest possible frequencies.
They incorporate capacitive sensors for low operating force (Operating Force: <30 grams typical) and include electronics with programmable filtering and multi-point linearization for improved performance and accuracy. The overall design minimizes, and in many cases virtually eliminates, any influence from common lab environment vibrations.

The application range includes:

• Tension

• Compression

• Low Cycle Fatigue

• Thermo Mechanical Fatigue

• Through Zero Fatigue

• Strain-controlled Testing

Features

• Meet or exceed the accuracy class B-1 according to ASTM E83 and class 0.5 according to ISO 9513

• Rugged design for testing through specimen failure

• Hot mountable and retractable

• Self-setting gauge length with fine adjustment feature

• All models can measure in both tension and compression and may be used for cyclic testing at test frequencies up to 10 Hz

• Excellent ambient vibration rejection; primary vibration mode >100 Hz typical

• Digital controller and power supply included. Provides high level DC voltage output with low noise Easily interfaced to test controllers, data acquisition boards and chart recorders

• Includes high speed analogue and digital outputs

• Web-based user interface for setup and data acquisition

• Selectable analogue and digital filter options from 2 Hz to 3 kHz

• Built-in calibration reference and auto-zero features

• Multiple extensometer calibration files may be loaded for use with one controller

• Can be used with specimens at elevated temperatures while only requiring room temperature calibration

• Quick-disconnect water cooling fittings and signal cables

• Analog Output: User specified, ±10VDC typical, ±10.8VDC rail

• Digital Output: 24 bit high speed Ethernet output with built-in web interface

• Cyclic Testing: up to 10 Hz, depending on test system and test amplitude

• Linearity: 11 point digital linearization, ≤0.1% FS typical linearity

• Hysteresis: ≤0.1% FS typical

• Resolution: <75 PPM (0.0075%FS) RMS @ 4 kHz, <6 PPM (0.0006%FS) @ 100 Hz at gauge length

• Filter: Selectable 100 Hz analog and 2 Hz – 3 kHz digital filters

• Sensor Cables: 2 m (6.5 ft) room temperature cables

• Output Cables: Flexible 2.4 m (8 ft) analog output cables

• Operating Force: <30 grams typical

• Contact Force: <560 grams typical

• Environment: Recommended for testing in dry air, inert / non-corrosive gases, or vacuum

• Power: Includes power supply for your country