Technically known as precision electronic force measuring units, United's Load Cells are designed to precisely measure the amount of force (load) applied to the specimen being tested. Available in single or dual bridge, United load cells offer the flexibility of using two readouts simultaneously, if desired. Constructed to meet ASTM E-4 requirements, each self-identifying load cell contains a resident flash memory storing the following properties:
United's Model DIG-5000 Smart Digital is a precision data acquisition system. It is designed for ease of use while providing the operator with a variety of options usually available only with computer-controlled test machines.
Test results are displayed simultaneously on an easy-to-read alpha-numeric screen. Simple push-button operation allows quick selection of any desired measurement unit including lbs, kg, and N. The control panel can be locked to prevent unauthorized changes to the setup.
The DIG-5000 features a 20-digit display range with an average update rate of 20 readings per second. Each system is calibrated in-house to ensure that it meets ASTM E-4 requirements. The DIG-5000 is included as standard equipment on selected United testing machines such as United Model LCH Digital Speedy Tester.
Easy, quick, one-handed placement is the key to United's Model EZ Extensometer. Designed with a minimum number of moving parts, and "snap-on" mechanization, the unit combines simple operation with reliable, efficient measuring performance.
To accommodate most testing requirements, the EZ extensometer can be used on either round or flat samples. Each comes with two special features: a built-in overload protection and the automatic gage length setting which helps ensure a high degree of consistency between the users and the testing samples. Special gage lengths are also available upon request. Available in both room and high temperature versions, the EZ Extensometer is accurate to ± 0.0001 (Class B1) as per ASTM-E83.
Using a unique laser scanning approach developed by United Calibration Corporation, the United Laser Extensometer permits accurate non-contact extension measurement from the start of the test through sample failure without test interruption. Designed to provide accurate extension measurements from less than 1% to greater than 1000% strain, this versatile optical scanning device performs well for sample testing with an environmental chamber at elevated or even very low test temperatures, as well as at normal temperatures and environments.
The United Laser Extensometer is unique in its ability to measure a broad range of materials including ultra-high modulus carbon composites, ceramics, steel and non-ferrous metals, paper and wood products as well as most varieties of elastomers. For more information on the United Laser Extensometer and how it compares with other non-contact extensometry methods, see the web article, "Optical Extensometry - It's Here to Stay".
Using the principles of laser diffraction, this unique system is designed to accurately measure the cross section of carbon and other opaque fibers and filaments in the diameter range of five to fifty microns.
The unit is available in both single and dual array configuration. The single array system is used in the measurement of circular or near-circular fibers. The dual array system measures two sections which are 90° apart and is recommended when fiber eccentricity exceeds 0.2. An optional bar code reader is available to aid in sample identification and data storage and retrieval.
The Laser Fiber Measurement System may be used as a stand-alone measurement system or in conjunction with United's Single Filament Tensile Test System. The unit is capable of providing accurate measurement data for up to 120 mounted fibers per hour. Typical measurement system resolution and accuracy are 0.15 % and 0.5 %, respectively, of fiber diameter.