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计数电路
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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.
      
  counter circuit
Figure 7 depicts the capacitance versus fanout plot for the nets in the Counter circuit.
      
For the counter circuit a mean power error of 3.2% per net and load, with a standard deviation of 1.6% is achieved.
      
The functionality of the counter circuit was tested by bread-boarding a circuit composed of tunnel diodes and discrete NPN transistors.
      


In this paper, high precise measuring principle of the pitch error for spiral bevel gears and the new technique used in the instrument are described. The pitch error is an important item in gear accuracy. Most measurements ofthe pitch error are carried out by comparative measuring principle. As the compara-tive measurement is used for a spiral bevel gear, two feelers can not be set atthe same position in two adjacent corresponding flanks. However, because the pitcherrors at various position of the face width...

In this paper, high precise measuring principle of the pitch error for spiral bevel gears and the new technique used in the instrument are described. The pitch error is an important item in gear accuracy. Most measurements ofthe pitch error are carried out by comparative measuring principle. As the compara-tive measurement is used for a spiral bevel gear, two feelers can not be set atthe same position in two adjacent corresponding flanks. However, because the pitcherrors at various position of the face width are not equal so that the pitch errorsin the gear can not be indicated truly by the measured data. The absolute measur-ing principle is employed in our instrument. A precise moire-fringe grating isused. The pitch error can be measured automatically. This instrument is suitable forbevel gears with various reference angle, cylinder gears with various profile (in-cluding shaving cutter, slotting tool) and index plates etc. δt_∑ is recorded on a pa-per chart. The δt_P and δ_xt are printed. A frequency multiplier with phase-locked loop is used to obtain 1000 frequen-cy multiplication for moire-fringe signal so that the quantizing error of the pulsecould be reduced. A "multiply Z counter" is used. All kinds of tooth number canbe measured. The stepless multiplier which is made up of a "multiply Z counter"and a "phase-locked tracking frequence multiplier" may be used for other cases. Aspecial-purpose digital computer which is consisted of decade counters has been de-veloped.

本文对相对法及绝对法测量弧齿锥齿轮的齿距误差的精度进行了分析与比较。相对法远不能满足弧齿锥齿轮高精度测量的要求。而绝对式半自动测齿仪和单啮仪,只能测量圆柱齿轮。研制的“光栅式齿距误差测量仪”,适用于弧齿锥齿轮的测量。本文论述了该仪器的工作原理,对仪器分度装置、锁相倍频器、乘Z计数器中的某些精度问题进行了分析,介绍了用简单计数电路实现在一定范围内各种齿数的测量,采用计数器代数运算电路计算△t_∑(△t_(∑i))、△t_p、△_xt。该仪器还适用于对圆柱齿轮、圆锥直齿轮、蜗轮等的测量。

A new dynamic method for the measurement of grating encoder has been developed and conducted in this paper.Unlike the method generally used at present which can only gets encoder error at very limited points, the new one accepts the method of spectrum analysis to measure errors of the encoder by means of computer and gets its error function R(θ).The principle and applications of the new method are investigated .And practical experiments as well as precision estimation are introduced in the paper. Using accuracy...

A new dynamic method for the measurement of grating encoder has been developed and conducted in this paper.Unlike the method generally used at present which can only gets encoder error at very limited points, the new one accepts the method of spectrum analysis to measure errors of the encoder by means of computer and gets its error function R(θ).The principle and applications of the new method are investigated .And practical experiments as well as precision estimation are introduced in the paper. Using accuracy cunter and error modify technology by means of software to delete systematic error. The new method can not only gets accuracy result, but aslo removes influence of artifact and environment.

本文探讨了计量圆光栅的精度检测问题,提出了一种新的动态检测方法。它不同于目前普遍采用的标准多面棱体静态检测法,后者只能得到圆光栅静止于圆周内若干等分位置的静态误差,而前者采用频谱分析方法、借助计算机处理,实现对圆光栅动态地、连续测量,最终得到其误差函数R(θ)。本方法采用软件修正技术剔除安装偏心等系统误差,硬件系统使用了高精度的脉冲计数电路,使得检测系统的精度大为提高,并且排除了测量过程中,环境或人为因素对检测精度的影响。本文对这种光栅动态检测技术的原理及应用进行了研究,并给出此方法的精度估计

Stress wave time instrument mainly includes: accelerometer, pulse converter, counter, decode and display unit. It can measure the time that stress wave pass through the material. So the travelling speed of stress wave can be obtained. In this paper, the design method of signal amplifier, gate signal producing and counter circuit was presented.

应力波时间间隔仪主要由加速度传感器、应力波脉冲转换器、计数、译码和显示单元电路组成。它可以测量出应力波通过材料两端的时间。从而得到应力波的传播速率。本文给出了应力波信号放大 ,变换及门信号产生、计数电路的设计原理

 
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