Test project	Test conditions	Performance
Temperature coefficient	There sistance value is measured at room temperature and at room temperature +100℃ respectively and the resistance change rate of each degree is calculated.	±350ppm/℃
Short time overload	Apply avoltage of 10 times the rated power or the maximum load voltage(take the smaller value).	△R≤± (2%+0.052)
Resistance to welding heat	Immerse in a tin furnace at 350±10%℃ for 2-3 seconds.	△R≤± (1%+0.052)
Weld ability	Immerse in a tin furnace at 260±5%℃ for 2-3 seconds.	Solder area covers over95%
Temperature cycle	Leave at -55℃ for 30 minutes,then at +25℃ for 10-15 minutes, then at +275℃ for 30 minutes,and finally at +25℃ for 10-15 minutes,in a total of 5 cycles.	△R≤± (1%+0.052)
Load life in humidity	Overload rated voltage or Max. working voltage(get the lower) for 1000 hours (1.5 hours on and half-hours off) at the 40±2℃ and 90~95°relative humidity.	△R≤± (5%+0.052)
Load life in heat	At a temperature of 70±2℃, apply the rated voltage or maximum operating voltage (which ever is lower) for a total of 1000 hours (1.5 hours on,0.5 hours off).	△R≤± (5%+0.052)
Noncombustibility	Add AC load at 5,10,and 16 times the rated power for 5 minutes respectively.	No obvious flames

Short Time Rating Table

30minutesThemaximumcurrentloadratethattheresistorcanwithstandundershorttimeload
Loadtime(s)	5	10	30	60	180	300	600	900	1800
Maximumcurrenttolerance(%)	400	350	250	200	140	120	110	105	100

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