Suitable Situation -> 適用于工廠、學校和科研單位作精密測量及精密交/直流電阻標準。 It is suitable to be used as precise measuring standard and precise AC/DC resistance standard for factories, colleges, and research institutes. 詳細指標-> Detail Sp">
合用場合-> Suitable Situation ->
適用于工廠、學校和科研單位作精密測量及精密交/直流電阻標準。
It is suitable to be used as precise measuring standard and precise AC/DC resistance standard for factories, colleges, and research institutes.
詳細指標-> Detail Specification->
1． 電阻范圍Resistance range：1Ω~1.11111MΩ;
Resistance range：1Ω~1.11111MΩ;
2． 最小步進值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Temperature coefficien：±5×10-6/℃；
emperature coefficien：±5×10-6/℃
5． 其他參數Other parameters：
Other parameters
步進電阻值
100kΩ 10kΩ 1kΩ 100Ω 10Ω 1Ω
時間常數（ 10-8 s ） 100 5 5 1 1 5
測試頻率上限（ kHz ） 2 10 20 50 100 100
最大允許誤差 ±0.02% ±0.1%
年變化 ±0.01% ±0.05%
步進電阻值Step resistance value 100kΩ 10kΩ 1kΩ 100Ω 10Ω 1Ω
Step resistance value 100kΩ 10kΩ 1kΩ 100Ω 10Ω 1Ω
時間常數（10-8）Time constant 100 5 5 1 1 5
Time constant(10-8) 100 5 5 1 1 5
測試頻率上限（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試頻率上限時的最大允許誤差。
The working frequency is equal to or less than the permissible error limit of measurement frequency of the resistance box..
技術規格-> Technical specification->
SB2012型精密交/直流電阻箱由六個十進位盤構成，采用時間常數小、穩定性高的精密電阻器，獨特的屏蔽補償措施及精密密封開關。具有 頻率特性好、穩定性高、性能可靠、開關接觸電阻變差小等獨特優點
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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