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power resistance value RN' shall be measured. (See IEC68-2-20

/GB2423.28 Tb)

引出端强度

Strength of lead

terminal

无损坏

No break out

ΔR/RN ≤20%

(ΔR =∣RN-RN'∣)

根据IEC68-2-21（GB2423 .29）试验U 进行试验。

试验 Ua：拉力10N，持续10 S；

试验 Ub：弯曲90°，拉力5N，持续10 S；

扭转 180°，拉力5N，持续10 S。

在 25±2℃条件下恢复4～5 h 后，复测额定零功率电阻RN'

Fasten the body and apply a force gradually to each lead until

10N and then keep for 10sec, Hold body and apply a force to

each lead until 90°slowly at 5N in the direction of lead axis

and then keep for 10sec, and do this in the opposite direction

repeat for other terminal. After recovering 4~5h under 25±

2℃, the rated zero power resistance value RN' shall be

measured.

(See IEC68-2-21/GB2423.29 Ua / Ub)

电气性能ELECTRICAL CHARACTERISTICS

指标项目Item

技术要求Specification

测试条件/方法Test Conditions & Methods

额定零功率电阻

Rated Zero-Power

Resistance

RN (Ω)

20±20%

环境温度 TA: 25℃±1℃

测试电压: 1.5VDC

在恒温TA 条件下，放置1~2 小时后测得阻值RN。

Ambient temp. Range:25℃±1℃(TA).

Testing voltage: 1.5VDC

After placing for 1~2 hours under TA, the resistance value

shall be measured

热耗散系数δ(mW/℃)

Thermal Dissipation

Constant

≥6

在特定的环境温度下，热耗散系数(δ)为热敏电阻电功率消耗(ΔP)

与本体温度变化量 (ΔT)的比值.

The thermal dissipation constant(δ) could be calculated by

the ratio of a change in power dissipation(ΔP) of the

thermistor to a change in temperature(ΔT) of the thermistor

at a specified ambient temperature

热时间常数τ(s)

Thermal Time Constant

≤20

热时间常数(τ)为在零功率条件下，热敏电阻的温度下降到其

最初温度与最终温度之差为63.2% 时所需要的时间

The time(τ shall be measured within which the temperature

change of NTC thermistor is reached at 63.2% of the ambient

temperature change under zero power condition

材料常数

Material Constant B

2800±10%

B=T1T2/( T2- T1) ×

Ln

(R1/R2)

R1 , R2 分别为 T1 , T2 温度下的零功率电阻

R1 , R2 is zero-power resistance at T1 , T2

T1 = 298.15 K(25℃) T2 = 323.15 K(50℃)

最大稳态电流(A)

Max.Steady State

Current

无可见损伤

visible mechanical

damage.

ΔRN / RN ≤20%

(ΔR =∣RN-RN'∣)

环境温度:25℃±2℃Ambient temp. Range.

测试电流0.5A Testing Current

可靠性试验（周期性检测项目）Reliability Test