JPH0263471U - - Google Patents
Info
- Publication number
- JPH0263471U JPH0263471U JP14211588U JP14211588U JPH0263471U JP H0263471 U JPH0263471 U JP H0263471U JP 14211588 U JP14211588 U JP 14211588U JP 14211588 U JP14211588 U JP 14211588U JP H0263471 U JPH0263471 U JP H0263471U
- Authority
- JP
- Japan
- Prior art keywords
- output
- operational amplifier
- high voltage
- generation circuit
- voltage generation
- 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
- 238000009413 insulation Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Description
第1図は本考案に係る絶縁抵抗計の一実施例の
接続図、第2図は第1図の動作を説明するための
図である。
Rx…絶縁抵抗体、E…アース端子、L…ライ
ン端子、U1〜U3…演算増幅器、CP1,CP
2…コンパレータ、A/D…アナログ・デイジタ
ル変換器、DIS…表示部。
FIG. 1 is a connection diagram of an embodiment of an insulation resistance meter according to the present invention, and FIG. 2 is a diagram for explaining the operation of FIG. 1. Rx...Insulation resistor, E...Earth terminal, L...Line terminal, U1~U3...Operation amplifier, CP1, CP
2...Comparator, A/D...analog-digital converter, DIS...display unit.
Claims (1)
アース端子とライン端子間に接続され前記直流高
電圧発生回路の出力が印加される被測定の絶縁抵
抗体、前記ライン端子にその入力抵抗が接続され
た第1の演算増幅器、前記直流高電圧発生回路の
出力と第1の演算増幅器の出力とが印加され直流
高電圧発生回路の出力から第1の演算増幅器の出
力を引算する第2の演算増幅器、第1の演算増幅
器の出力が加えられる複数のコンパレータの出力
に応じてそのゲインが可変されこのゲインを第1
の演算増幅器の出力に乗じる第3の演算増幅器、
第2の演算増幅器の出力Vinと第3の演算増幅
器の出力Vrefとが入力されてVrefでVi
nを除算するアナログ・デイジタル変換器、及び
このアナログ・デイジタル変換器より得られるデ
イジタル・データを表示するデイジタル表示器よ
りなる絶縁抵抗計。 DC high voltage generation circuit that generates DC high voltage,
an insulated resistor to be measured that is connected between a ground terminal and a line terminal and to which the output of the DC high voltage generation circuit is applied; a first operational amplifier whose input resistance is connected to the line terminal; and the DC high voltage generation circuit. The output of the circuit and the output of the first operational amplifier are applied to the second operational amplifier, which subtracts the output of the first operational amplifier from the output of the DC high voltage generation circuit, and the output of the first operational amplifier is added. The gain is varied according to the outputs of multiple comparators, and this gain is
a third operational amplifier that multiplies the output of the operational amplifier;
The output Vin of the second operational amplifier and the output Vref of the third operational amplifier are input, and Vi
An insulation resistance meter comprising an analog-to-digital converter for dividing n, and a digital display for displaying digital data obtained from the analog-to-digital converter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14211588U JPH0637341Y2 (en) | 1988-10-31 | 1988-10-31 | Insulation resistance tester |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14211588U JPH0637341Y2 (en) | 1988-10-31 | 1988-10-31 | Insulation resistance tester |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0263471U true JPH0263471U (en) | 1990-05-11 |
JPH0637341Y2 JPH0637341Y2 (en) | 1994-09-28 |
Family
ID=31407786
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14211588U Expired - Lifetime JPH0637341Y2 (en) | 1988-10-31 | 1988-10-31 | Insulation resistance tester |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0637341Y2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11326408A (en) * | 1998-04-21 | 1999-11-26 | Illinois Tool Works Inc <Itw> | Resistance measuring meter having voltage amplifier circuit |
JP2018046584A (en) * | 2017-12-26 | 2018-03-22 | ルネサスエレクトロニクス株式会社 | Analog-digital conversion circuit and electronic apparatus |
-
1988
- 1988-10-31 JP JP14211588U patent/JPH0637341Y2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11326408A (en) * | 1998-04-21 | 1999-11-26 | Illinois Tool Works Inc <Itw> | Resistance measuring meter having voltage amplifier circuit |
JP2018046584A (en) * | 2017-12-26 | 2018-03-22 | ルネサスエレクトロニクス株式会社 | Analog-digital conversion circuit and electronic apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPH0637341Y2 (en) | 1994-09-28 |
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