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稳定的要求不同标准要求有不同吧,例:
& X# G5 r* c4 U7 Z6 y& {" |IEC60598:3 V9 P, a6 l+ K' q: k- Z
12.4.1 f Measurements shall not be taken until the luminaire has stabilized thermally, i.e. temperatures are changing at a rate less than 1 °C per hour. " q. X* o8 o; a8 p
UL1029:
, ], r7 A. {8 A; E, x$ r) L21.1.6 A thermocouple-measured temperature is to be considered constant if three successive readings, taken at not less than 15-minute intervals, indicate no upward change.
& y; v9 N/ l9 ~' D; p: B/ ]# K7 LUL1278:, R# T& p' E, r$ F, Z$ y! T6 s
39.1.8 To determine whether a heater complies with the requirement in 39.1.1, it is to be operated continuously until constant temperatures have been reached. A temperature is considered to be constant when three successive readings, taken at intervals of 10 percent of the previously elapsed duration of the test (but not less than 5-minute intervals), indicate no change. |
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