专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5121632A Point level switch 失效
标题翻译：点电平开关
公开(公告)号：US5121632A
公开(公告)日：1992-06-16
申请号：US637318
申请日：1991-01-03
申请人： Manley S. Keeler , Steven E. Margison , Boyce M. Carsella, Jr.
发明人： Manley S. Keeler , Steven E. Margison , Boyce M. Carsella, Jr.
IPC分类号： G01F23/26
CPC分类号： G01F23/266
摘要： A point level sensor senses capacitance of a material in a vessel to determine level. The capacitance is input to a comparator which is part of an oscillator circuit developing a square wave signal having a period corresponding to capacitance. A microprocessor includes an internal counter which determines the period of four pulses to determine an average period. The microprocessor drives relay circuits providing discrete outputs according to specific precalibrated levels to be sensed. The point sensor includes a self-test mode which operates once per second to test for shorting of the probe, expected frequency response and an open probe.
摘要翻译：点电平传感器感测容器中材料的电容以确定电平。该电容被输入到比较器，该比较器是振荡器电路的一部分，该振荡器电路产生具有对应于电容的周期的方波信号。微处理器包括内部计数器，其确定四个脉冲的周期以确定平均周期。微处理器驱动继电器电路，根据要检测的特定预校准电平提供离散输出。点传感器包括自检模式，每秒运行一次以测试探头的短路，预期的频率响应和开放式探头。

2. 发明授权

US4682958A Data entry terminal and memory module therefor 失效
标题翻译：数据录入终端及其内存模块
公开(公告)号：US4682958A
公开(公告)日：1987-07-28
申请号：US696571
申请日：1985-01-30
申请人： William H. Slavik , William P. Carlson , George L. Cepynsky , Paul G. Dussault , Steven E. Margison , James A. Wolf, Jr.
发明人： William H. Slavik , William P. Carlson , George L. Cepynsky , Paul G. Dussault , Steven E. Margison , James A. Wolf, Jr.
IPC分类号： G09B7/02 , G09B7/00
CPC分类号： G09B7/02
摘要： A data entry terminal for storing a plurality of user generated answers is described which includes a removable volatile read/write memory module. The memory module is used to store formatting information used to configure the data entry terminal as appropriate for a particular set of questions. The memory module can for example store a set of correct answers as well as a set of user answers for each of the questions of the test, and it can store data used to disable certain functions of the data entry terminal, such as the ability of a user to revise an initially entered answer. The data entry terminal operates to record user answers in the portable memory module, which can then be removed from the data entry terminal and applied as an input to an external computer for analyzing user responses. The portable memory module includes a battery for powering a volatile semiconductor memory included in the module. The semiconductor memory is shielded against static discharge, and one of the chip enable terminals of the memory is coupled to a capacitor to prevent momentary voltage transients from changing the contents of the memory in an uncontrolled fashion.
摘要翻译：描述了用于存储多个用户生成的答案的数据输入终端，其包括可移动的易失性读/写存储器模块。存储器模块用于存储用于配置数据输入终端的格式化信息，适用于特定问题集。存储器模块可以例如存储一组正确的答案以及用于每个测试问题的一组用户答案，并且它可以存储用于禁用数据输入终端的某些功能的数据，例如用户修改初始输入的答案。数据输入终端操作以将用户答案记录在便携式存储器模块中，然后可将其从数据输入终端中移除，并作为输入应用于外部计算机以分析用户响应。便携式存储器模块包括用于对包括在模块中的易失性半导体存储器供电的电池。半导体存储器屏蔽静电放电，并且存储器的芯片使能端之一耦合到电容器以防止瞬时电压瞬变以不受控制的方式改变存储器的内容。

3. 发明授权

US5131271A Ultrasonic level detector 失效
标题翻译：超声波液位探测器
公开(公告)号：US5131271A
公开(公告)日：1992-07-21
申请号：US509136
申请日：1990-04-16
申请人： Kevin M. Haynes , Steven E. Margison
发明人： Kevin M. Haynes , Steven E. Margison
IPC分类号： G01F23/296 , G01S7/52 , G01S13/18 , G01S15/18
CPC分类号： G01F23/2962 , G01S13/18 , G01S15/18 , G01S7/52004 , Y10S367/908
摘要： An ultrasonic level detector includes a transducer for generating and receiving bursts of sonic energy at a surface to locate the position of the surface. In response to receiving a burst of energy reflected from the surface, the transducer generates an electrical signal, which is then supplied to a variable gain amplifier. After amplification, the electrical signal is supplied to a comparator and a peak detector. The comparator generates a timing signal upon the electrical signal exceeding a threshold. A window generator circuit generates a receive window that controls whether the electrical signal is supplied to the comparator and the magnitude of the threshold on the comparator. The peak detector determines the maximum amplitude of the electrical signal, which may be used to vary the amplifier gain and the number of pulses included in an excitation signal which drives the transducer. Upon receipt of the timing signal, a microprocessor determines the distance between the transducer and the detected surface.
摘要翻译：超声波液位检测器包括用于在表面产生和接收声能的突发的换能器，以定位表面的位置。响应于接收到从表面反射的能量脉冲串，换能器产生电信号，然后将其提供给可变增益放大器。放大后，将电信号提供给比较器和峰值检测器。比较器在电信号超过阈值时产生定时信号。窗口发生器电路产生接收窗口，该窗口控制电信号是否被提供给比较器，以及比较器上的阈值的大小。峰值检测器确定电信号的最大幅度，其可以用于改变放大器增益和包括在驱动换能器的激励信号中的脉冲数。在接收到定时信号时，微处理器确定换能器与检测到的表面之间的距离。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式