UNDER CONSTANT TEMP. 70±3℃.(IN CASE OVER 15W, 25±3℃),APPLYING RATING VOLTAGE FOR 1.5 HOURS,THEN DISCONNECTING FOR 0.5 HOUR,RECYCLING FOR 1000HOURS ,PUT RESISTOR IN ROOM CONDITION AND ZERO LOADING FOR 1 HOUR THE VARIANCE OF VAILUE SHALL BE WITHIN 3%±0.05Ω.
UNDER CONSTANT TEMP. 70±3℃.(IN CASE OVER 15W, 25±3℃),APPLYING RATING VOLTAGE FOR 1.5 HOURS,THEN DISCONNECTING FOR 0.5 HOUR,RECYCLING FOR 1000HOURS ,PUT RESISTOR IN ROOM CONDITION AND ZERO LOADING FOR 1 HOUR THE VARIANCE OF VAILUE SHALL BE WITHIN 3%±0.05Ω.
温度70±3℃(15W以上,须25±3℃)的恒温槽中,加额定电压1.5小时,切断0.5小时,如此连续迴圈1000小时后,再置于室温下1小时,其阻值变化应在3%±0.05Ω以内,其外观不得损伤.