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General Overview of Force Testing Procedure:
- Purpose: This instruction applies to tests for customers requiring ISO / IEC 17025 compliance. This instruction applies to force gauges, load cells with or without instrumentation and tensile testers (test stands) to be tested.
- Environmental Considerations: Environmental conditions such as temperature and relative humidity shall be documented. Whether in B-Accurate's testing laboratory or at an on-site location, the equipment to be tested and all standards that shall be used be put in the same area in which the testing shall take place for a sufficient time to allow for temperature equalization of all items used and to be tested prior to the actual testing.
- Visual Inspection: The equipment being tested shall be visually inspected for general condition and proper operation. Identification makings such as manufacturer, model, serial number, ID#, capacity and increments shall be recorded.
- Tolerances and Test Loads: Tolerance - Manufacturer's specifications or the customer's specified tolerance. Test Load - To equipment capacity or the customer's contracted test load. Regulatory specifications such as ASTM E4 requirements, when specified, mandate tolerance and test loads.
- Repeatability: Apply full capacity loads three times to exercise the system, confirm repeatability and verify return to zero. This shall be done for each system function or range at beginning testing for that function or range. If the unit does not repeat to zero or applied load load, then this condition shall be documented and the next function shall be checked for zero return and repeatibility. The customer shall be advised of these condition for further disposition.
- Testing and As Found Readings: Test loads of approximately 10%, 20%, 40%, 60%, 80% and 100% of capacity should be applied. Available test standards may dictate other test load increments. Customer specified test loads or regulatory requirements shall take precedence over above. Observations shall be recorded at each test load. All functions or ranges (tension, compression and length, as applicable) shall be tested and observations recorded prior to any adjustments to those functions.
- Adjustments and As Left Readings: If the function being tested is in tolerance and no adjustments are needed, then the as left reading shall be recorded the same as the as found readings. Adjust the equipment as needed or to be within tolerance. If the equipment cannot be adjusted to tolerance then this condition shall be recorded on the test report. Repeat the test load applied above and record the as left results. Complete the test report documentation recording all equipment tested information, standards used information and environmental conditions.