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    • 2. 发明授权
    • Digital display measuring apparatus
    • 数字显示测量仪
    • US4689890A
    • 1987-09-01
    • US880651
    • 1986-06-30
    • Shingo Nishina
    • Shingo Nishina
    • G01B21/00G01B21/08G01D3/06G01D7/00G01D7/08G01B7/02G02F1/133
    • G01B21/08G01B21/00G01D3/06G01D7/08
    • A digital display measuring apparatus including a movable contact on the body of the measuring apparatus to engage with an object to be measured, an encoder for converting the displacement of the contact into an electrical output signal, a counting circuit for counting the output signal of the encoder, and a digital display for indicating the counted value from the counting circuit. The digital display further includes a measurement indicator unit for indicating the displacement of the contact and a preset indicator unit for indicating a preset value higher than those indicated in the measurement indicator unit. The preset indicator unit includes a presetting device for supplying a reference value to the preset input of the preset indicator unit. With this apparatus even if the object to be measured has a length exceeding the maximum displacement of the contact, the full length of the object may be measured and indicated.
    • 一种数字显示测量装置,包括在测量装置的主体上与可测量物体啮合的可动触点,用于将触点的位移转换为电输出信号的编码器,用于对所述测量装置的输出信号进行计数的计数电路 编码器和用于指示计数电路的计数值的数字显示器。 数字显示还包括用于指示触点的位移的测量指示器单元和用于指示高于测量指示器单元中指示的预设值的预设指示器单元。 预置指示器单元包括用于向预设指示器单元的预设输入提供参考值的预设装置。 即使要测量的物体的长度超过接触件的最大位移,也可以测量和指示物体的全长。
    • 10. 发明授权
    • Circuit arrangement for automatic zero level compensation
    • 用于自动零电平补偿的电路布置
    • US3824481A
    • 1974-07-16
    • US33022273
    • 1973-02-07
    • BODENSEEWERK PERKIN ELMER CO
    • SPONHOLZ RKIEFER H
    • G01D3/06G01D5/248G01R19/00H04B1/12
    • G01D5/248G01D3/06G01R19/00
    • A known type of circuit for compensating (i.e. balancing or zeroing) an input signal relative to a changing base line includes a voltage-to-frequency converter receiving the input signal being compensated or balanced, a counter receiving the output pulses of this voltage-to-frequency converter, and a digital-to-analog converter controlled by the counter, where the output of the digital-to-analog converter generates a correction signal which can be added algebraically to the input signal for zero level (base line) compensating or balancing. To shorten the time of balancing without causing overshooting, the present circuit causes coarse adjustment by feeding the output of a (relatively high) fixed frequency generator to the more significant counting stages of the counter until an approximation of balance is reached, followed by feeding the output of the conventional voltage-to-frequency converter to the lesser significant stages after this coarse balancing has been completed. The means for changing over from the coarse balancing to the fine adjustment may include a positive and a negative threshold-value switch.
    • 用于相对于改变的基线补偿(即平衡或归零)输入信号的已知类型的电路包括接收正被补偿或平衡的输入信号的电压 - 频率转换器,接收该电压到 频率转换器和由计数器控制的数模转换器,其中数模转换器的输出产生校正信号,该校正信号可以代数地加到零电平(基线)补偿的输入信号上,或者 平衡 为了缩短平衡时间而不引起过冲,本电路通过将(相对高的)固定频率发生器的输出馈送到计数器的更重要的计数级而导致粗调,直到达到平衡的近似值,然后馈送 在这种粗略平衡完成之后,传统的电压 - 频率转换器的输出到较小的显着级。 用于从粗略平衡切换到微调的装置可以包括正和负阈值开关。