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ZX67開關式直流標准電阻箱

發布日期：2025-01-05
訪問次數：1233
地址：上海寶山

ZX67開關式直流標准電阻箱是电阻值可变的电阻量具，其电阻值可在已知范围内按一定的阶梯而改变。开关式直流标准电阻箱的电阻元件均接于各个触点之间，而且固定于个旋转架的接触电刷则在触点上移动。在此种电阻箱里被利用的电阻是介于起始触点和在使用时电刷所触及的触点之间的电阻。

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産品特點

ZX67開關式直流標准電阻箱其电阻值可在已知范围内按一定的阶梯而改变。开关式直流标准电阻箱的电阻元件均接于各个触点之间，而且固定于个旋转架的接触电刷则在触点上移动。

詳細介紹

一、ZX67開關式直流標准電阻箱結構

电阻箱是电阻值可变的电阻量具，其电阻值可在已知范围内按一定的阶梯而改变。开关式直流标准电阻箱的电阻元件均接于各个触点之间，而且固定于个旋转架的接触电刷则在触点上移动。在此种电阻箱里被利用的电阻是介于起始触点和在使用时电刷所触及的触点之间的电阻。

二、用途：

1、供直流電路中作精密調節電阻之用。

2、整機校驗千分之一下的電阻箱

3、采用精密電阻箱來整機校驗攜帶式直流單電橋等

三、技術指標：

1、測量範圍：0.01-----11111.1歐姆

2、在遵守下列使用條件時，電阻箱的誤差不會超過表1允許的基本誤差。

⑴、周圍空氣溫度爲20--±3℃，相對濕度在80%以下；

⑵、電流爲直流電；

⑶、功率不超過額定值。 3、電阻箱的基本誤差如表1規定：

X1000	X100	X10	X1	X0.1	X0.01
±0.01%	±0.01%	±0.05%	± 0.2%	±1%	±5%

4、電阻箱內部線路與外殼之間的絕緣電阻,應不少于1000兆歐,實驗電壓爲500伏

5、 .电阻箱线路与外壳之间的绝缘强度，须能经受住频率为50周，实际正弦波2000伏交流电的作用，利时一分钟。

6、電阻箱各擋之間大允許電流不應超過表2規定

倍率	X0.01	X0.1	X1	X10	X100	X1000
允許通過電流	3安	1安	0.3安	0.1安	0.03安	0.01安

7、外型尺寸爲340X165X148毫米，重量約4公斤

四、結構特点：

電阻箱支座具有電位引出端可以按元件檢定，開關中的接觸環，接觸片和電刷之間均用微彈簧緊壓，因此長期使用後，接觸電阻變差小，支座采用高絕緣聚鳳材料塑，絕緣性能好，面板上讀數示值排列成二條直線可簡潔而清晰的讀出示值，電阻箱所有轉換開關放在零位時，零電阻爲0.01歐姆。因此，z小步進開關無零位，從1開始，在使用過程中對測量結果中不必扣除零電阻。電阻元件采用高穩定錳銅合金線以無感式繞制與瓷管上經過嚴格的工藝處理，所以具有高穩定性。ZX56型電阻箱廣泛適合學校、工廠和科研單位作電測量和其他實驗之用。

上一篇：ZX25A型開關式直流標准電阻箱

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