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计数电路
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    This paper describes a digitial voltage discriminator, which is synthesized by digitial comparator and ADC. The threshold is program controllable with high stability.
    文中描述了一个数字化电压甄别器,它由数字化比较器和ADC构成,其阈值由计数电路决定,阈值稳定,便于程控或自动变化,数字模糊区近似为1.5LSB。
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  counting circuit
The results of this study indicate that in terms of efficiency, the Packard 2250Ca liquid scintillation spectrometer is sensitive to the scintillation cocktail employed for241Pu analysis, particularly when the burst counting circuit is enabled.
      
By the use of a photoelectric pickup and an electronic counting circuit, the instrument which has been described allows one to measure infrasonic damped oscillations with great accuracy.
      
A counting circuit, pulse/delay generator and waveform generator are used to synchronize the PIV system and the drop ejection process.
      
Changes were also made in the electronic counting circuit to enable a determination of ion intensities at high count rates.
      
Unlike encoders that require a counting circuit to track position, absolute encoders provide the correct data after a power-down event.
      


This paper describes the design and results of a fast discrimination-fast counting system. The fast discriminator consists of a high speed GaAs tunnel diode, the fast counting circuit consists of some ECL super high speed D triggers. The resolving time of the system is less than 3ns, the range of discrimination threshold is 10mV-400mV.

本文叙述一个快甄别-快计数电路的设计和结果。快甄别电路由高速砷化镓隧道二极管组成,快计数电路由ECL超高速D触发器组成。此系统的分辨时间小于3ns,甄别阈范围为10mV至400mV。

This paper describes a digitial voltage discriminator, which is synthesized by digitial comparator and ADC.The threshold is program controllable with high stability.Digitial region of confusion is approximately equal to 1.5 LSB. This discriminator has a single channel analyzer function mode with channel width of 1.5 LSB0

文中描述了一个数字化电压甄别器,它由数字化比较器和ADC构成,其阈值由计数电路决定,阈值稳定,便于程控或自动变化,数字模糊区近似为1.5LSB。甄别器有三种工作状态:输入信号幅度大于阈值的积分工作状态或小于阈值的工作状态以及道宽为1.5LSB的微分工作状态。

A comparison has been made theoretically between the integrator and the simple counting circuit used in on off γ ray level meter. The results shown that under the same conditions the acting time of the level meter with integrator is faster, and the activity of γ ray is lower for the given reliability and acting time. These results could be useful for the design and application of the meter. (

针对采用两种不同电路的开关式γ料位计进行了理论比较,结果表明在同等条件下采用积分电路比之简单计数电路γ继电器动作时间快,对给定的可靠度和动作时间所用放射源的活度小。对开关式γ料位计的设计和应用具有现实意义。

 
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