Zero power resistance test

IEC60539-1

Immersion of the tested productIn a constant temperature bath at 25 ℃± 0.05 ℃, test the resistance value of the tested product after its resistance value stabilizes

Controllable resistance accuracy±1%以内

B-value test

IEC60539-1

Immersion of the tested productIn a constant temperature bath at 25 ℃, 50 ℃ (or 85 ℃), after the resistance value of the tested object stabilizes, test its resistance value separately and calculate the B value

B-value accuracy controllable within ± 1%

Free fall

IEC60068-2-32

Drop height:1.5 ± 0.1M; Falling surface: cement
Number of drops:1次

R25△R/R≤±1%
No visible damage

Insulation testing

IEC60539-1

The insulation layer shell of the product is pressurized to500VDC, measure insulation resistance value

>500MΩ

Voltage withstand test

IEC60539-1

Voltage resistance:1500VAC; Leakage current: 2mA; Duration: 60S

No breakdown、damage

Tensile testing

IEC60068-2-21

Horizontal and uniform slow pulling of the packaging endF> 1.0KG (can be requested by customers)

R25△R/R≤±1%
No visible damage

Vibration testing

Q/HBm 108-94

Test frequency:10-500Hz; Amplitude: 1.2mm
Acceleration:30m/s²
Direction:X. Y and Z direction time: 8H/direction

R25△R/R≤±1%
No visible damage

Thermal time constant test

IEC60539-1

Immerse the thermistor in temperatureAfter reaching thermal equilibrium in water at 25 ℃, quickly remove it and immerse it in water at 85 ℃. When the resistance value reaches the resistance value corresponding to a temperature change of 63.2%, record the time it takes

Meets the requirements of the specification sheet

Testing of dissipation coefficient

Measurement+Record the zero power resistance value at 85 ℃± 1 ℃.
At ambient temperature+Test with the following circuit at 25 ℃± 1 ℃. The accuracy of the voltmeter and ammeter should not be less than 1%. Adjust the current Ith until the ratio Eth/Ith is equal to the zero power resistance value at the corresponding temperature T1 (± 5%). After the reading stabilizes, record the values of Eth and Ith.
Calculate the dissipation coefficient using the following formulaδ
           δ=Eth*Ith/(T1-25℃)  (ｍW/℃)
In the formula: Eth---------Measured voltage，V
     Ith----------The measured current，mA
 

Meets the requirements of the specification sheet

Steady state damp heat test

IEC60068-2-78

Temperature:40 ± 2 ℃; Humidity: 92-95RH;
Time:1000±24H

R25△R/R≤±1%
No visible damage

High temperature storage test

IEC60068-2-2

Temperature:Tmax ± 5 ℃; Time: 1000 ± 24H

R25△R/R≤±1%
No visible damage

Thermal Shock Test

IEC60068-2-14

Tmin℃×30min→25℃×5min→Tmax℃×30min→25℃×5min，1000Cycles

R25△R/R≤±1%
No visible damage

Low temperature storage test

IEC60068-2-1

Temperature:Tmin ± 5 ℃; Time: 1000 ± 24H

R25△R/R≤±1%
No visible damage

Salt spray test

IEC600068-2-11

Temperature:35 ± 5 ℃; Hourly collection volume: 10mL~2.0mL; Time: 12h/24h/48h

R25△R/R≤±1%
No visible damage