JPS61182856U

JPS61182856U -

Info

Publication number: JPS61182856U
Application number: JP6622585U
Authority: JP
Priority date: 1985-05-02
Filing date: 1985-05-02
Publication date: 1986-11-14
Also published as: JPH0449585Y2

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す接続図、第
２図は従来の技術を説明するための接続図である
。１：被測定抵抗体、２：電圧測定手段、３：回
路の共通電位点、４：保護回路、４Ａ：第１のダ
イオード、４Ｂ：トランジスタ、４Ｃ：バイアス
供給用抵抗器、４Ｄ：第２のダイオード、５：定
電流源、５Ａ：演算増幅器、５Ｂ：基準電圧源、
５Ｃ：バイアス電圧源、５Ｄ：基準抵抗器、６：
順方向過大電圧検出手段、６Ａ：第３のダイオー
ド、６Ｂ：分圧用抵抗器、６Ｃ：比較参照電圧源
、７：ダイオード、８：電界効果トランジスタを
オフに制御する手段。 FIG. 1 is a connection diagram showing an embodiment of this invention, and FIG. 2 is a connection diagram for explaining the conventional technology. 1: Resistor to be measured, 2: Voltage measuring means, 3: Common potential point of the circuit, 4: Protection circuit, 4A: First diode, 4B: Transistor, 4C: Bias supply resistor, 4D: Second Diode, 5: constant current source, 5A: operational amplifier, 5B: reference voltage source,
5C: Bias voltage source, 5D: Reference resistor, 6:
Forward direction overvoltage detection means, 6A: third diode, 6B: voltage dividing resistor, 6C: comparison reference voltage source, 7: diode, 8: means for controlling the field effect transistor to turn off.

補正昭６０．８．１９図面の簡単な説明を次のように補正する。明細書１３頁１５〜１６行「８：電界効果……
手段。」を「８：結合回路。」に訂正する。Amendment August 19, 1980 The brief description of the drawing is amended as follows. Specification page 13, lines 15-16 “8: Electric field effect...
means. " is corrected to "8: Combined circuit."

Claims

[Claims for Utility Model Registration] A: If an excessive voltage is connected between the constant current source that applies a known constant current to the resistor under test and the resistor under test, and which connects the resistor under test. a protection circuit that protects the constant current source when given a constant current source; B a first diode having one end connected to one input terminal connecting the resistor to be measured; and C this first diode. A transistor whose collector is connected to the other end of the diode, D a bias supply resistor connected between the collector and base of this transistor, E a second diode whose one end is connected to the base of the above transistor, F this a third diode with one end connected to the other end of the second diode and the other end connected to the common potential point of the circuit; G a voltage dividing resistor connected in parallel with this third diode; forward overvoltage detection means for detecting that the voltage generated in the voltage resistor exceeds a specified voltage; A resistance measuring circuit comprising: means for controlling off a current control field effect transistor;