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    • 8. 发明授权
    • Low noise charge ramp electrometer
    • 低噪声充电斜坡静电计
    • US5153502A
    • 1992-10-06
    • US758045
    • 1991-09-12
    • John P. MorganThomas C. Piper
    • John P. MorganThomas C. Piper
    • G01R29/24
    • G01R29/24
    • An electrometer capable of measuring small currents without the use of a feedback resistor which tends to contribute a large noise factor to the measured data. The electrometer eliminates the feedback resistor through the use of a feedback capacitor located across the electrometer amplifier. The signal from the electrometer amplifier is transferred to a electrometer buffer amplifier which serves to transfer the signal to several receptors. If the electrometer amplifier is approaching saturation, the buffer amplifier signals a reset discriminator which energizes a coil whose magnetic field closes a magnetic relay switch which in turn resets or zeros the feedback capacitor. In turn, a reset complete discriminator restarts the measurement process when the electrometer amplifier approaches its initial condition. The buffer amplifier also transmits the voltage signal from the electrometer amplifier to a voltage-to-frequency converter. The signals from the voltage-to-frequency converter are counted over a fixed period of time and the information is relayed to a data processor. The timing and sequencing of the small current measuring system is under the control of a sequence control logic unit.
    • 能够测量小电流而不使用倾向于对测量数据造成较大噪声因子的反馈电阻器的静电计。 静电计通过使用位于静电计放大器两侧的反馈电容器来消除反馈电阻。 来自静电计放大器的信号被传送到静电计缓冲放大器,其用于将信号传送到几个受体。 如果静电计放大器接近饱和,则缓冲放大器发出一个复位鉴频器,该鉴频器激励一个线圈,该线圈的磁场闭合一个磁继电器开关,该继电器开关又复位或零反馈电容器。 反过来,当静电计放大器接近其初始状态时,复位完成鉴别器重新开始测量过程。 缓冲放大器还将来自静电计数放大器的电压信号传送到电压 - 频率转换器。 来自电压 - 频率转换器的信号在固定时间段内进行计数,并将信息中继到数据处理器。 小电流测量系统的时序和顺序由序列控制逻辑单元控制。