阻值及阻值誤差

Resistance and Resistance tolerance

阻值允許誤差

Resistance tolerance

±5% (J)

阻值將根據(jù)如下表格中所施加的電壓值后進(jìn)行測(cè)量。Resistance shall be measured using the applied voltage values of the following table.

溫度系數(shù)

Temperature coefficient

±300ppm

在常溫及常溫+100℃時(shí)分別測(cè)量電阻并計(jì)算每度的阻值變化率。Test the resistance value at normal temperature and normal temperature added 100℃,calculate per℃ resistance value change rate .

額定功率

Power rating load

△R/R≦± (1%＋0.05Ω)

表面溫升(temperature) 350℃Max.

在受試電阻上加30分鐘的額定電壓the power rating is applied to the resistor kept horizontally for 30 min.

短時(shí)間過(guò)負(fù)荷

Short-time overload

△R/R≦± (2%+0.05Ω)

10倍額定電壓測(cè)試5秒。At 10× rated voltage for 5 seconds.

絕緣阻值

Insulation resistance

≥100MΩ

DC500V

絕緣電壓

Dielectric withstanding voltage

無(wú)火花、燒損或絕緣破壞等異常現(xiàn)象。

Without damage by

flash-over, fire. or

breakdown, etc.

≥AC2000V，60秒（sec.）

端子強(qiáng)度

Terminal strength

無(wú)機(jī)械損傷

no evidence of mechanical damage

張力(Pull)：196N ， 30± 5 秒seconds

電阻體強(qiáng)度

Resistor strength

無(wú)機(jī)械損傷

no evidence of mechanical damage

294N，30± 5秒seconds

特性

Characteristics

規(guī)格值

Standards

測(cè)試方法

Test methods

耐熱性

Heat resistance

△R/R≦± (1%+0.05Ω)

在375±10℃錫爐中浸2~3秒

Immerge into 375±10℃ tin stove for 2~3 seconds.

熱沖擊

Thermal shock

△R/R≦± (2%+0.05Ω)

-55℃/30分鐘（min.）→+25℃/15分鐘（min.）→+125℃/30分鐘（min.）→+2515分鐘（min.

共5個(gè)循環(huán) total 5 cycles.

耐溫負(fù)荷壽命

Power rating load

△R/R≦± (5%+0.05Ω)

在溫度為40±2℃，相對(duì)濕度為90~95%的恒溫恒濕箱中，施加額定電壓或比較大工作電壓（取較小者）共1000小時(shí)（通1.5小時(shí)，斷0.5小時(shí)）。Overload rated voltage or Max.working voltage (get the lower) for 1000 hours (1.5 hours on and half-hour off ) at the 40±2℃ and 90~95% relative humidity.

耐溫負(fù)荷壽命

Load life in heat

△R/R≦± (5%+0.05Ω)

在70±2℃恒溫恒濕箱中施加額定電壓或比較大工作電壓（取較小者）1000小時(shí)（通1.5小時(shí)，斷0.5小時(shí)）。Overload rated voltage or Max.working voltage (get the lower ) for 1000 hours (1.5 hours on and half-hour off) at the 70±2℃.