GZ-10型高精度数字式表面电阻测试仪的研制

静电火花是煤矿、加气站等有危险气体场所发生爆炸的主要点火源之一。为防止静电火花产生,关键是设备和材料必须具有抗静电性能,而评价聚合物制品抗静电性能的主要方法是用表面电阻测试仪测量其表面电阻。本文介绍了研制的新型GZ-10型高精度数字式表面电阻测试仪的系统组成及硬件设计。该表面电阻测试仪采用低阻档和高阻档两组测试电路,高阻档测试电路测量双取样电阻的电压,低阻档电路采用比例法,克服了普通表面电阻测试仪因被测电压或电流的变化而变化的缺点,保证了测量的准确性。

Development of GZ-10 High-precision Digital Surface Resistance Tester

Static electricity spark is one of the main ignition sources in such dangerous places as coal mines and gas stations with the poten-tial of gas explosion. The key measure to prevent the generation of electrostatic spark is to ensure that the equipment and materials be antistatic. For evaluating their antistatic performance, the main method is to measure the surface resistance of polymer products with high resistance meters. This paper introduced the system composition and hardware design of the new GZ-10 high-precision digital surface resistance tester. This tester is composed of two testing circuits; one for low resistance and the other for high resistance. The high-resistance testing circuit adopts the way of measuring voltage of double sampling resistors, and the low-resistance testing circuit adopts proportional method. It can overcome the disadvanta-ges of common surface resistance testers which change with the variation of the measured voltage or current, and can ensure the measurement ac-curacy.