JPS59122556U

JPS59122556U - current measuring device

Info

Publication number: JPS59122556U
Application number: JP1639583U
Authority: JP
Inventors: 高山　光二; 本城　純
Original assignee: 株式会社アドバンテスト
Priority date: 1983-02-07
Filing date: 1983-02-07
Publication date: 1984-08-17

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の電流測定装置を示すブロック図、第２図
はこの考案による電流測定装置の一例を示す接続図、第
３図はＲｆ比測定状態の接続を示す図、第４図はＲｓ比
測定状態の接続を示す図、第５図は電流測定時における
接続状態を示す図である。１１、ＤＡ変換器、１２：設定器、１４：演算増幅器、
１６：出力端子、１７：差回路、１９：負荷、２１：電
流源、２９．　３３．　３８：バッファ、５３：ＡＤ変
換器、３□〜３□：電流検出用抵抗器。補正　昭５８．１１３０図面の簡単な説明を次のｊうに補正する。明細書第２３頁第１３〜１４行の「第５図は・・・・・
・示す図である。」を「第５図は電流測定の準備接続状
態を示す図、第６図は電流測定時における接続状態を示
す図である。」と補正する。Fig. 1 is a block diagram showing a conventional current measuring device, Fig. 2 is a connection diagram showing an example of the current measuring device according to this invention, Fig. 3 is a diagram showing connections in Rf ratio measurement state, and Fig. 4 is a diagram showing Rs. FIG. 5 is a diagram showing connections in a ratio measurement state, and FIG. 5 is a diagram showing connections in a current measurement state. 11, DA converter, 12: setting device, 14: operational amplifier,
16: Output terminal, 17: Difference circuit, 19: Load, 21: Current source, 29. 33. 38: Buffer, 53: AD converter, 3□ to 3□: Current detection resistor. Amendment 1130/1980 The brief description of the drawing is amended as follows. On page 23 of the specification, lines 13-14, ``Figure 5...''
・It is a diagram showing. " is corrected to "FIG. 5 is a diagram showing the connection state in preparation for current measurement, and FIG. 6 is a diagram showing the connection state at the time of current measurement."

Claims

[Claims for Utility Model Registration] A current source that generates a current according to a set value, an operational amplifier to which the current from the current source is supplied, and a load current connected to the output side of the operational amplifier. A current detection resistor, a high input impedance difference circuit that inputs the voltage across the current detection resistor and outputs the difference between the two input voltages, and connects the output side of the difference circuit to the input side of the operational amplifier. a feedback means connected to the current detecting resistor for negative feedback of the voltage across the current detecting resistor to the operational amplifier; and A for converting and measuring the output voltage of the difference circuit into a digital signal.
Two different values are set for the D converter and the above current source, and from the two measured values of the above AD converter for each of these set values □,
means for determining a relational expression between the current flowing through the current detection resistor, the output voltage of the difference circuit, the two set values, and the two measured values, and converts the output voltage of the difference circuit into the AD converter. A current measuring device that measures the current to the load from the above relational expression.