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61. 发明专利

JPH04157324A SIGNAL PROCESSING METHOD OF ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPH04157324A
公开(公告)日：1992-05-29
申请号：JP27906290
申请日：1990-10-19
申请人： HITACHI LTD , HITACHI INSTRUMENTS ENG
发明人： SETA NOBUAKI , SAITO KOJI , FUKUNAGA MASAO
IPC分类号： G01F1/60
摘要： PURPOSE:To obtain a stable output by a method wherein the average value of the intermediate data of a sampling data for a short term is made a new data, the average value of the new data for a long term is obtained, and the average value is made a new data when the new data is not within the variable width from the average value. CONSTITUTION:A flow rate signal including noises is taken into a RAM 120 in a time series fashion via an A/D converter. A processor 100 makes operation and judgment based on the data, and outputs the result as a flow rate signal via a D/A converter 160. The value of the flow rate is indicated by a display device 140. The short term data of the sampling data are re-arranged, and what is averaged from the intermediate values with the maximum and minimum values removed is made a new data. The average value (c) of the new data for a long term is obtained. When the new data is not in the variable width of the preset average value, the average value (c) is output as a fresh data. The variable width and the regulating number of times as criteria of the operation and judgment can be set by the combination of the device 140 and a key switch. The set content is stored in the RAM 120 and an involatile memory 110.

62. 发明专利

JPS61124824A Exciting circuit of electromagnetic flowmeter 失效
标题翻译：电磁流量计的电路
公开(公告)号：JPS61124824A
公开(公告)日：1986-06-12
申请号：JP24606784
申请日：1984-11-22
申请人： Hitachi Ltd
发明人： SAITO KOJI
IPC分类号： G01F1/60
CPC分类号： G01F1/60
摘要： PURPOSE:To attain the miniaturization and wt. reduction of an exciting circuit and to enhance the reliability thereof, by controlling the supply of a current to an exciting coil by a pair of current direction control transistors and a pair of current value transistors. CONSTITUTION:In a circuit wherein an exciting coil 4 is alternately changed to positive and negative and a square wave is excited by a DC current, the exciting coil 4 is inserted between the middle points of a transistor bridge consisting of transistors 9-12. A pair of transistors 11, 12 are subjected to ON/OFF operation by a positive and negative change-over control circuit 3 while a pair of transistors 9, 10 are controlled in a continuity ratio by operational amplifiers to control a current value so as to bring the same to the definite value set by a setting circuit 8. by this method, the capacity of each transistor can be made small and miniaturization and wt. reduction can be achieved.
摘要翻译：目的：实现小型化和重量级。通过控制通过一对电流方向控制晶体管和一对电流值晶体管向励磁线圈提供电流来减少励磁电路并提高其可靠性。构成：在励磁线圈4交替地变为正负极并且由直流电流激发方波的电路中，励磁线圈4插入由晶体管9-12组成的晶体管桥的中点之间。一对晶体管11,12由正，负转换控制电路3进行ON / OFF操作，而一对晶体管9,10由运算放大器以连续性比被控制以控制电流值，以便将其设置为由设定电路8设定的确定值。通过该方法，可以使每个晶体管的容量小，小型化，可以实现减少。

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