tag 标签: 额外电流

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  • 热度 11
    2011-12-14 18:46
    1130 次阅读|
    0 个评论
    在比某种材料波长较短的波长范围里,光能足以激发电子从电极材料发射。这将导致电极之间气体的离子化,提供导电路径。如果在高真空中进行测量,这些电子将产生 额外电流 。为了避免这些效应,选择的照明波长应当大于 光电效应 阈值波长。对于镓来说,这个波长是295nm。 At wavelengths shorter than a certain material-dependent wave-length, light is energetic enough to induce emission of electronsfrom the electrode material. This leads to an ionization of the gasbetween the electrodes, providing a conductive path. If the mea-surement is performed in high vacuum, these electrons producean additional current. To avoid these effects, the wavelengthchosen for illumination should be greater than the threshold forthe photoelectric effect. For gallium, this wavelength is 295nm.   Stored Charges 累积电荷 假设电荷存储于许多 绝缘体 (尤其是特氟纶),那么在改变施加电压或温度后,可能需要几个小时的时间才能达到 电荷平衡 ,尤其是对于具有极高阻抗的样本而且施加电压较高的时候更是如此。因此,要等到电流达到平衡后,再进行测量。 Given that charges are stored in many insulators (especiallyTeflon), it may take hours for the current to reach equilibriumafter changing the applied voltage or temperature, especially forsamples with very high resistances and at high applied voltages.Don’t start the measurement until equilibrium is reached.   设备清单 • 6517A型静电计 • 低噪声三芯 同轴转接电缆 • PC、 IEEE 线缆 等 • SF 6 气瓶 • 镓 • 定制的测量室,包括三芯同轴转接电缆以及高压馈通         了解更多信息      要想了解有关 6517A 型静电计 / 高阻表 或者吉时利其他系列数字源表的更多信息,请点击http://www.keithley.com.cn/products/localizedproducts/highresistance/6517a,或者联系吉时利公司:全国免费电话800-810-1334手机用户请拨打440-650-1334。 登录吉时利官方微博(http://weibo.com/keithley)与专家进行互动。 8008101334 4006501334 010-84475556     同轴转接电缆http://www.keithley.com.cn/products/semiconductor/parametricanalyzer/4200scs/?path=4200-SCS/ACC_4200-SCS IEEE卡和适配器 http://www.keithley.com.cn/products/accessories/ieee/cables 6517A型静电计/高阻表http://www.keithley.com.cn/products/localizedproducts/highresistance/6517a
  • 热度 15
    2011-12-14 16:38
    2143 次阅读|
    0 个评论
    在比某种材料波长较短的波长范围里,光能足以激发电子从电极材料发射。这将导致电极之间气体的离子化,提供导电路径。如果在高真空中进行测量,这些电子将产生 额外电流 。为了避免这些效应,选择的照明波长应当大于 光电效应 阈值波长。对于镓来说,这个波长是295nm。 At wavelengths shorter than a certain material-dependent wave-length, light is energetic enough to induce emission of electronsfrom the electrode material. This leads to an ionization of the gasbetween the electrodes, providing a conductive path. If the mea-surement is performed in high vacuum, these electrons producean additional current. To avoid these effects, the wavelengthchosen for illumination should be greater than the threshold forthe photoelectric effect. For gallium, this wavelength is 295nm.   Stored Charges 累积电荷 假设电荷存储于许多 绝缘体 (尤其是特氟纶),那么在改变施加电压或温度后,可能需要几个小时的时间才能达到 电荷平衡 ,尤其是对于具有极高阻抗的样本而且施加电压较高的时候更是如此。因此,要等到电流达到平衡后,再进行测量。 Given that charges are stored in many insulators (especiallyTeflon), it may take hours for the current to reach equilibriumafter changing the applied voltage or temperature, especially forsamples with very high resistances and at high applied voltages.Don’t start the measurement until equilibrium is reached.   设备清单 • 6517A型静电计 • 低噪声三芯 同轴转接电缆 • PC、 IEEE 线缆 等 • SF 6 气瓶 • 镓 • 定制的测量室,包括三芯同轴转接电缆以及高压馈通         了解更多信息      要想了解有关 6517A 型静电计 / 高阻表 或者吉时利其他系列数字源表的更多信息,请点击http://www.keithley.com.cn/products/localizedproducts/highresistance/6517a,或者联系吉时利公司:全国免费电话800-810-1334手机用户请拨打440-650-1334。 登录吉时利官方微博(http://weibo.com/keithley)与专家进行互动。         同轴转接电缆http://www.keithley.com.cn/products/semiconductor/parametricanalyzer/4200scs/?path=4200-SCS/ACC_4200-SCS IEEE卡和适配器 http://www.keithley.com.cn/products/accessories/ieee/cables 6517A型静电计/高阻表http://www.keithley.com.cn/products/localizedproducts/highresistance/6517a
  • 热度 18
    2011-12-1 11:37
    1218 次阅读|
    0 个评论
    在比某种材料波长较短的波长范围里,光能足以激发电子从电极材料发射。这将导致电极之间气体的离子化,提供导电路径。如果在高真空中进行测量,这些电子将产生 额外电流 。为了避免这些效应,选择的照明波长应当大于 光电效应 阈值波长。对于镓来说,这个波长是295nm。 At wavelengths shorter than a certain material-dependent wave-length, light is energetic enough to induce emission of electronsfrom the electrode material. This leads to an ionization of the gasbetween the electrodes, providing a conductive path. If the mea-surement is performed in high vacuum, these electrons producean additional current. To avoid these effects, the wavelengthchosen for illumination should be greater than the threshold forthe photoelectric effect. For gallium, this wavelength is 295nm.   Stored Charges 累积电荷 假设电荷存储于许多 绝缘体 (尤其是特氟纶),那么在改变施加电压或温度后,可能需要几个小时的时间才能达到 电荷平衡 ,尤其是对于具有极高阻抗的样本而且施加电压较高的时候更是如此。因此,要等到电流达到平衡后,再进行测量。 Given that charges are stored in many insulators (especiallyTeflon), it may take hours for the current to reach equilibriumafter changing the applied voltage or temperature, especially forsamples with very high resistances and at high applied voltages.Don’t start the measurement until equilibrium is reached.   设备清单 • 6517A型静电计 • 低噪声三芯 同轴转接电缆 • PC、 IEEE 线缆 等 • SF 6 气瓶 • 镓 • 定制的测量室,包括三芯同轴转接电缆以及高压馈通         了解更多信息      要想了解有关 6517A 型静电计 / 高阻表 或者吉时利其他系列数字源表的更多信息,请点击http://www.keithley.com.cn/products/localizedproducts/highresistance/6517a,或者联系吉时利公司:全国免费电话800-810-1334手机用户请拨打440-650-1334。 登录吉时利官方微博(http://weibo.com/keithley)与专家进行互动。   吉时利仪器公司(中国)市场部 (T) 8008101334,  8610 82255010,  82255011     同轴转接电缆http://www.keithley.com.cn/products/semiconductor/parametricanalyzer/4200scs/?path=4200-SCS/ACC_4200-SCS IEEE卡和适配器 http://www.keithley.com.cn/products/accessories/ieee/cables 6517A型静电计/高阻表http://www.keithley.com.cn/products/localizedproducts/highresistance/6517a