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- 合用場(chǎng)合-> Suitable Situation -> 適用于工廠、學(xué)校和科研單位作精密測(cè)量及精密交/直流電阻標(biāo)準(zhǔn)?！? It is suitable to be used as precise measuring standard and precise AC/DC resistance standard for factories, colleges, and research institutes. 詳細(xì)指標(biāo)-> Detail Specification-> 1． 電阻范圍Resistance range：1Ω~1.11111MΩ; Resistance range：1Ω~1.11111MΩ; 2． 最小步進(jìn)值Minimum step value：1Ω； Minimum step value：1Ω； 3． 額定功率Nominal power: 0.25W; Nominal power: 0.25W; 4． 溫度系數(shù)Temperature coefficien：±5×10-6/℃； emperature coefficien：±5×10-6/℃ 5． 其他參數(shù)Other parameters： Other parameters 步進(jìn)電阻值 100kΩ 10kΩ 1kΩ 100Ω 10Ω 1Ω 時(shí)間常數(shù)（ 10-8 s ） 100 5 5 1 1 5 測(cè)試頻率上限（ kHz ） 2 10 20 50 100 100 最大允許誤差 ±0.02% ±0.1% 年變化 ±0.01% ±0.05% 步進(jìn)電阻值Step resistance value 100kΩ 10kΩ 1kΩ 100Ω 10Ω 1Ω Step resistance value 100kΩ 10kΩ 1kΩ 100Ω 10Ω 1Ω 時(shí)間常數(shù)（10-8）Time constant 100 5 5 1 1 5 Time constant(10-8) 100 5 5 1 1 5 測(cè)試頻率上限（kHz） Measuring frequency upper limit 2 10 20 50 100 100 Measuring frequency upper limit(kHz) 2 10 20 50 100 最大允許誤差*Maximum permissible error ±0.02% ±0.1% Maximum permissible error ±0.02% ±0.1% 年變化Annual variation ±0.01% ±0.05% Annual variation ±0.01% ±0.05% *：電阻箱的工作頻率等于或低于測(cè)試頻率上限時(shí)的最大允許誤差。 The working frequency is equal to or less than the permissible error limit of measurement frequency of the resistance box.. 技術(shù)規(guī)格-> Technical specification-> SB2012型精密交/直流電阻箱由六個(gè)十進(jìn)位盤構(gòu)成，采用時(shí)間常數(shù)小、穩(wěn)定性高的精密電阻器，獨(dú)特的屏蔽補(bǔ)償措施及精密密封開(kāi)關(guān)。具有 頻率特性好、穩(wěn)定性高、性能可靠、開(kāi)關(guān)接觸電阻變差小等獨(dú)特優(yōu)點(diǎn) SB2012 Precise AC/DC Resistance Box is composed of 6 decade scales and precise resistors, whose time constant is little and stability is very high. It adopts special screen compensation measure and precise seal switch. It also possesses many special characteristics, such as good frequency characteristic, good stability, reliable performance, and variation differences are very little when switch touches resistance.
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