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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ETFV25 датащи(PDF) 5 Page - EPCOS |
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ETFV25 датащи(HTML) 5 Page - EPCOS |
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5 / 10 page  Reliability data Test Test methods/conditions Requirement Varistor voltage The voltage between two terminals with the specified measuring current applied is called VV (1 mADC @ 0.2 ... 2 s). To meet the specified value Clamping voltage The maximum voltage between two terminals with the specified standard impulse current (8/20 µs) applied. To meet the specified value Surge current derating, 8/20 µs CECC 42 000, test C 2.1 100 surge currents (8/20 µs), unipolar, interval 30 s, amplitude corresponding to derating curve for 100 impulses at 20 µs | ∆V/V (1 mA)| ≤10% (measured in direction of surge current) No visible damage Surge current derating, 2 ms CECC 42 000, test C 2.1 100 surge currents (2 ms), unipolar, interval 120 s, amplitude corresponding to derating curve for 100 impulses at 2 ms | ∆V/V (1 mA)| ≤10% (measured in direction of surge current) No visible damage Abnormal overvoltage test UL1449, limited current abnormal overvoltage test. Apply a high AC voltage to ThermoFuse varistor, the amplitude of overvoltage and current limit will be adopted from UL1449 general instruction in section 37. The specimen will be tested on a softwood surface covered with a double layer of white tissue paper. The specimen is to be loosely draped with a double layer of cheesecloth. The cheesecloth shall cover openings where flame, molten or other particles may be expelled as a result of the test. The test result will be visually inspected. Any of these phenomena shall not be observed, or this specimen will be judged as failed part. 1. Emission of flame, molten metal, glowing or flaming particles through any openings (pre-existed or created as a result of the test) in the product. 2. Charring, glowing, or flaming of the supporting surface, tissue paper, or cheesecloth. 3. Ignition of the enclosure. 4. Creation of any openings in the enclosure that result in accessibility of live parts, when judged in accordance with accessibility of live parts, UL1449 section 13. Housed varistors ETFV25 ThermoFuse varistors, ETFV25 series Page 5 of 10 Please read Cautions and warnings and Important notes at the end of this document. |
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