JPS61182856U - - Google Patents
Info
- Publication number
- JPS61182856U JPS61182856U JP6622585U JP6622585U JPS61182856U JP S61182856 U JPS61182856 U JP S61182856U JP 6622585 U JP6622585 U JP 6622585U JP 6622585 U JP6622585 U JP 6622585U JP S61182856 U JPS61182856 U JP S61182856U
- Authority
- JP
- Japan
- Prior art keywords
- diode
- resistor
- constant current
- voltage
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 2
- 230000005669 field effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005685 electric field effect Effects 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Description
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 (1)
流源と上記被測定抵抗体との間に接続され被測定
抵抗体を接続する一方の入力端子に過大電圧が与
えられたとき上記定電流源を保護する保護回路と
から成る抵抗測定回路において、 B 被測定抵抗体を接続する一方の入力端子に一
端が接続された第1のダイオードと、 C この第1のダイオードの他端にコレクタを接
続したトランジスタと、 D このトランジスタのコレクタとベース間に接
続されたバイアス供給用抵抗器と、 E 上記トランジスタのベースに一端が接続され
た第2のダイオードと、 F この第2のダイオードの他端に一端が接続さ
れ回路の共通電位点に他端を接続した第3のダイ
オードと、 G この第3のダイオードと並列に接続された分
圧用抵抗器と、 H この分圧用抵抗器に発生する電圧が規定され
電圧を越えたことを検出する順方向過大電圧検出
手段と、 I この順方向過大電圧検出手段が順方向過大電
圧を検出したとき上記定電流源を構成する電流制
御用電界効果トランジスタをオフに制御する手段
と、 を設けて成る抵抗測定回路。[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;
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6622585U JPH0449585Y2 (en) | 1985-05-02 | 1985-05-02 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6622585U JPH0449585Y2 (en) | 1985-05-02 | 1985-05-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61182856U true JPS61182856U (en) | 1986-11-14 |
JPH0449585Y2 JPH0449585Y2 (en) | 1992-11-20 |
Family
ID=30598929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6622585U Expired JPH0449585Y2 (en) | 1985-05-02 | 1985-05-02 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0449585Y2 (en) |
-
1985
- 1985-05-02 JP JP6622585U patent/JPH0449585Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPH0449585Y2 (en) | 1992-11-20 |
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