Type

 
ITEM

 
PERFORMANCE AND QUALIITY ACCEPTANCE

 
TEST METHOD

 
Resistance to temperature
coefficient

 
 
1. Rx ＜ 100KΩ
PPM/℃ ＜ +350~500 PPM/℃
 
2. 100KΩ＞ Rx ＜1MΩ
PPM/℃ ＜ 0 ~ -700PPM/℃
 
Rx ＞1MΩ
PPM/℃ ＜ 0 ~ -1500PPM/℃

 
R = Measured resistance(Ω)at T
T ℃
Ro = Measured resistance (Ω)at To
To ℃ 
T = Measured test temperature(℃)
To = Measured base temperature( ℃)

 
Short time overload

 
≤ ±(1%R + 0. 5ohm)
Shall be no mechanical breakage
 

 
AC or DC voltage 2.5times the rated
Voltage for 5 seconds .

 
Voltage endurance

 
 
No breakdown or flashover
 

 
Lay the resistor on the 90° angle metal “V” peak is 1.42 times as much as insulate voltage .
 

 
Terminal strength

 
Shall be no mechanical breakage

 
Pull test apply 3.5KG force to the lead in the direction of lead axis for 30±5 seconds.
 

 
Heat resistively
against soldering

 
 
 
≤ ± (1%R + 0.5ohm)
Shall be no mechanical breakage
 

 
Dip the lead in to a solder bath having a temperature of 350℃ ± 10℃ up to 3±0.05mm from the body of the resistor and hold it for 3.5±0.5seconds leave the resistor ,at room temperature 1 hours after ,then Measure.
 

 
Load life test

 
 
≤ ±(5%R + 0.1ohm)
Shall be no mechanical breakage
 
 
 

 
In the constant temperature chamber 70℃ ,apply rated voltage for 1 hour and shut voltage for 0.5 hour and repeat this cycle for 1000 hours,
 

 
Solder ability

 
 
≥95%

 
Dip the lead in to a solder bath having a temperature of 260℃±5℃.
Time:5± 0.5seconds.
 

 
Humidity load test

 
 
 
≤± (5% R+ 0.1ohm)
Shall be no mechanical breakage
 
 

 
In temperature chamber 40℃±2℃,relative humidity 90 – 95%,Apply rated voltage 1.5hour and shut voltage 0.5 hour repeat this cycle for 1000 hours, leave in room temperature for 1 hour after test,
 

 
Resistance to solvent

 
No visible damages to protective coating and marking.
 

 
The resistor shall be completely immersed for 3 min in IPA and rubbed 10 times with the whisk.

 
Endurance at upper-limit temperature

 
 
≤±(5%R+0.1Ω)

 
At 125 ℃ temperature, duration of 1000h

 
Flammability
 
 

 
No evidence of flaming

 
The test flame shall be applied and removed for 15 secretary respectively,and repeated cycle for 5times.