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16.00 COMPUTERISED LABORATORY |
| Technical data and measurements availables See chapter 15.40 |
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Step-stress test, Din 44874 The purpose of the test is the determination of the Burning Index (B.I.) of a heating element. |
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Test of the 200 ageing cycles, Din 44874 The purpose of the test is to establish if, after 200 uninterrupted working cycles, the leakage current of a heating element has been subjected to alterations and to what degree. |
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Test of the 15 cycles in overload conditions,
as per CEI 61-150 norm, VDE 0720, IEC 335-1, NF 73200 The international norm foresees that a heating element, after the test of the 15 cycles in overload conditions at 1.27 times the Nominal Power, does not present anomalies at the end of the test. |
| Additional tests available |
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Test of uprated power and measurement
of the time to failure This is an alternative test to the step-stress test in the cases where the maximum applicable power is not enough to burn the heating element (heating element with low specific load). |
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Initial failure test (infant mortality) The purpose of the test is to verify that no heating element of a batch, which is being dispatched or is arriving, has defects, which can come out in the first working cycles. |
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Uprated power test at a defined time
and verification of survival This test subjects a certain number of heating elements (Ex. 3) to a defined period of ON working (Ex. from 1 to 3 hours) with a higher power than the nominal one (Ex. 2 nominal power) and to verify that at the end of the test the heating elements are still working and/or the values are in the expected tolerances. |
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Uprated power test with defined cycles
and verification of survival This test subjects a certain number of heating elements (Ex. 3) to a defined number of ON/OFF cycles (Ex. from 20 to 100) with a higher power than the nominal one (double nominal power). In addition to the number of set cycles, the system will automatically start an ON cycle for a defined time with nominal power. |
| Technological tests |
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Test of the 200 ageing cycles with continuous
test This test is wider than test (Ex. 2), as it follows the course of the leakage stationary current within 200 cycles, determining 15 intermediate readings. |
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Test of on/off cycles in step-stress
modes The purpose of the test is to cause the failure of the heating element in a short time by increasing simultaneously the specific load of the spiral tube and the time of ON/OFF cycle. |
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Interrupted step-stress test The purpose of the test is to subject a certain number of heating elements, all of the same model and production batch, to increasing power steps, to establish at which power the degradation of the electric characteristics occurs. |
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Uprated power test and measurement of
the cycles to failure The Accelerated Mean Life, which is determined in working conditions that are more exaggerated than the normal ones, is a parameter that may be correlated to the mean useful life, which is determined in the real working conditions. |
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Useful life test to failure The purpose of the test is to determine the Mean Useful Life of a heating element in working conditions that are as close as possible to the everyday usage. |
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Test of the accelerated mean life of
the heating elements at a specific load lower than 3w/cm2 The purpose of the test is to determine the Mean Useful Life of a heating element in more accelerated conditions of heat exchange, to reduce the testing time. |
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Test of the accelerated mean life of
the heating elements with removal of reduced heat The purpose of the test is to determine the Mean Useful Life of a heating element in conditions that are as close as possible to the everyday usage, with removal of air forced heat. |
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Test of the accelerated mean life for
heating elements with silicone sealing The purpose of the test is to quickly verify if the process of sealing with silicone sealing products is adequate to preserve the electric properties of the heating element. |
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Test of the accelerated mean life for
heating elements with silicone sealing at high temperature It is the same as test 15, with the difference that, being the testing conditions in the humidostatic chamber worse than in the preceding test, the acceleration factor AF will result numerically greater and the testing times shorter. |
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Test of the accelerated mean life of
heating elements in function of the electric insulation at temperature
(85±2)°c and r.h. (85±2)% The purpose of the test is to quickly verify the average time within which a normal heating element goes over the lower threshold of the electric insulation value. The test consists in verifying the values of insulation and leakage current in the testing period on heating elements that have remained in a humidostatic chamber. |
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Test of the accelerated mean life of
heating elements subjected to heat shocks The purpose of the test is to subject the heating elements to heat cycles, which are very rapid both as regards power and duration, to obtain a fast check of the qualitative level of a batch of heating elements. The heating elements (min. 5) are led to failure and burning. |
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Test for the determination of the acceleration
factor (AF) in accelerated tests The purpose of the test is to determine the acceleration factor AF to correlate the Accelerated Mean Life with the Useful Mean Life that is the real one, without accelerations. |
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