|
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.
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