瓷管繞線老化負載電阻 繞線電阻

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1.Features產(chǎn)品特性
   使用中若發(fā)生過載異常時發(fā)揮保險絲功能
符合安規(guī)UL-94V-O要求
 Coating meets UL-94V-0
 符合無鉛/ROHS要求
Lead-free and ROHS compliant
 

Characteristics		Standard	Test Methods
1.  Resistance Temperature Coefficient  (PPM/℃)		±300PPM/℃	Natural resistance change per temperature degree centigrade. (PPM/℃) R1: Resistance value at reference temperature. (T1) R2: Resistance value at reference temperature. (T2) T1: Room Temperature T2: T1±100℃
2.  Dielectric  Withstanding  Voltage		No evidence of flashover, mechanical damage or arcing or, insulation break down.	Resistors shall be subjected to an approximately sinusoidal test potential (as below) 60Hz applied between both terminals connected together and a  90° V-Block extending beyond the end of the resistor.
			Resistor Wattage			DC Volts
			1/2W(1WS) 1W,2W Above			350 600
3.  Solderability		90% Covered min.	The terminal lead shall be dipped into molten solder s at 3.2 to 4.8mm from the body of resistor.The temp. and time as below: a. 260±5℃for 2±0.5 seconds b. 350±10℃for 2±0.5seconds
4.  Resistance to Soldering		No evidence of mechanical damage △    R/R±5%	The terminal of the resistor is dipped into the molten solder of 350±10℃for 3±0.5 seconds. Then put the resistor in the room temperature. For min.3 hours.
5.  Humidity Load Life		±5% Max./1000Hours	Resistance change after 1000 hours ( 1.5 hours on  0.5 hours off)at rated continuous working voltage in a humidity chamber controlled at 40±2℃and 90~95% relative humidity .
6. Load Life		±5% Max./1000Hours	Permanent resistance change after 1000 hours  operating at rated continuous working voltage with a duly cycle of 1.5 hours on 0.5 hours off at 70 ± 2℃ambient .
7.  Temperature Cycling		Δ R/R at±1% Max.No evidence of mechanical damage.	Resistance change after continuous five cycles for duty cycle as specified below.
			Step		Temperature		Time
			1		-30℃		30 Minutes
			2		+25℃		10~15 Minutes
			3		+85℃		30 Minutes
			4		+25℃		10~15 Minutes
Characteristics	Standard			Test Methods
8.  Short Time   Overload	ΔR/R at±2% Max. with no evidence of arcing burning, or charring			Permanent resistance change after the application of a potential of 2.5 times rated continuous working voltage for 5 seconds at room temperature.
9. Terminal Strength	No  evidence  of  mechanical damage or loosening terminals			Direct load resistance to 2.5kg direct load 30±5 seconds twist test, for axial leads unit only. Terminal lead shall be bent through at a right angle at a point of 6.35mm from the body edge of resistor and shall be rotated through at a right angle about the original axis of the bent terminal in alternating direction for a total 3 rotations.