JPS6180466U - - Google Patents
Info
- Publication number
- JPS6180466U JPS6180466U JP16530984U JP16530984U JPS6180466U JP S6180466 U JPS6180466 U JP S6180466U JP 16530984 U JP16530984 U JP 16530984U JP 16530984 U JP16530984 U JP 16530984U JP S6180466 U JPS6180466 U JP S6180466U
- Authority
- JP
- Japan
- Prior art keywords
- resistance
- measurement
- value
- offset
- range
- 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
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
第１図はこの考案の一実施例を示した回路図、
第２図はマイクロコンピユータのフローチヤート
である。
図中、１は測定端子、２は定電流回路、３は測
定回路、４は測定リード、６は第１のスイツチン
グ手段、８はＡ−Ｄコンバータ、９は第２のスイ
ツチング手段、１０はマイクロコンピユータ、１
１はデジタル表示器である。
Figure 1 is a circuit diagram showing an embodiment of this invention.
FIG. 2 is a flowchart of the microcomputer. In the figure, 1 is a measurement terminal, 2 is a constant current circuit, 3 is a measurement circuit, 4 is a measurement lead, 6 is a first switching means, 8 is an A-D converter, 9 is a second switching means, and 10 is a micro computer, 1
1 is a digital display.
Claims (1)
電圧源に第１のスイツチング手段を介して選択的
に接続される定電流回路とその出力側に形成され
る測定回路とを含み該定電流回路から出力される
所定の定電流を上記測定回路およびこれに接続さ
れる１対の測定リードを介して被測定抵抗体に印
加してその抵抗値を電圧値に変換する抵抗−電圧
変換回路と、 第２のスイツチング手段を介して上記抵抗−電
圧変換回路と接地側とに選択的に接続されるＡ−
Ｄコンバータと、 該Ａ−Ｄコンバータの出力信号値に基いて上記
第１のスイツチング手段を切替えるとともに、オ
フセツト調整時には所定のプログラムにしたがつ
て上記第２のスイツチング手段を切替えるマイク
ロコンピユータと、 該マイクロコンピユータにオフセツト調整指令
信号を印加するゼロアジヤストスイツチと、 上記マイクロコンピユータから出力される上記
被測定抵抗体の抵抗値を表示するデジタル表示手
段とを備えてなり、被測定抵抗体の抵抗値の大小
に応じて測定レンジを自動的に切替えるデジタル
抵抗計であつて、 上記１対の測定リードを短絡させた状態におい
て上記ゼロアジヤストスイツチより上記マイクロ
コンピユータにオフセツト調整指令信号を印加す
ると、上記マイクロコンピユータは、上記第２の
スイツチング手段を接地側と上記抵抗−電圧変換
回路とに順次切替えて上記Ａ−Ｄコンバータのオ
フセツト電圧（Ｖｚ）、および上記測定回路の抵
抗による電圧降下Ｖｒｆと上記測定リードの抵抗
による電圧降下Ｖｒｗと上記オフセツト電圧Ｖｚ
との和である（Ｖｒｆ＋Ｖｒｗ＋Ｖｚ）なるオフ
セツト和電圧を測定し、該オフセツト調整時にお
ける測定レンジがダウンレンジである場合には、
（Ｖｒｆ＋Ｖｒｗ＋Ｖｚ）をダウンレンジのオフ
セツト値とするとともに、（Ｖｒｆ＋Ｖｒｗ＋Ｖ
ｚ−Ｖｚ）／Ｎ＋Ｖｚなる演算を行なつて（Ｖｒ
ｆ＋Ｖｒｗ）／Ｎ＋Ｖｚをアツプレンジのオフセ
ツト値とし、一方、該オフセツト調整時における
測定レンジがアツプレンジである場合には、（Ｖ
ｒｆ＋Ｖｒｗ＋Ｖｚ）をアツプレンジのオフセツ
ト値とするとともに、（Ｖｒｆ＋Ｖｒｗ＋Ｖｚ−
Ｖｚ）×Ｎ＋Ｖｚなる演算を行なつて（Ｖｒｆ＋
Ｖｒｗ）×Ｎ＋Ｖｚをダウンレンジのオフセツト
値とし、上記抵抗−電圧変換回路にて変換された
上記被測手抵抗体の電圧値からその測定レンジに
対応する上記オフセツト値を減算し、その値を上
記デジタル表示手段に出力することを特徴とする
デジタル抵抗計。[Claims for Utility Model Registration] A constant current circuit selectively connected to at least two reference voltage sources in a 1:N ratio via a first switching means, and a measurement circuit formed on the output side of the constant current circuit. and applying a predetermined constant current output from the constant current circuit to the resistor to be measured via the measurement circuit and a pair of measurement leads connected thereto to convert the resistance value into a voltage value. A-, which is selectively connected to the resistance-voltage conversion circuit and the ground side via a second switching means;
a D converter; and a microcomputer that switches the first switching means based on the output signal value of the A-D converter and switches the second switching means according to a predetermined program during offset adjustment; It is equipped with a zero adjustment switch that applies an offset adjustment command signal to a computer, and a digital display means that displays the resistance value of the resistor to be measured outputted from the microcomputer. It is a digital resistance meter that automatically switches the measurement range depending on the size of the resistance, and when an offset adjustment command signal is applied from the zero adjustment switch to the microcomputer with the pair of measurement leads short-circuited, the microcomputer The computer sequentially switches the second switching means between the ground side and the resistance-voltage conversion circuit to determine the offset voltage (Vz) of the A-D converter, the voltage drop Vrf due to the resistance of the measurement circuit, and the measurement lead. The voltage drop Vrw due to the resistance and the above offset voltage Vz
If the measurement range at the time of offset adjustment is the down range,
Let (Vrf+Vrw+Vz) be the down range offset value, and (Vrf+Vrw+Vz)
By performing the calculation (Vr
f+Vrw)/N+Vz is the offset value of the up range, and on the other hand, if the measurement range at the time of offset adjustment is the up range, (V
rf+Vrw+Vz) is the up-range offset value, and (Vrf+Vrw+Vz-
By performing the calculation (Vz)×N+Vz, (Vrf+
Vrw)×N+Vz is the offset value of the down range, the offset value corresponding to the measurement range is subtracted from the voltage value of the resistor to be measured converted by the resistance-voltage conversion circuit, and the value is calculated as above. A digital resistance meter characterized by outputting to a digital display means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16530984U JPH056543Y2 (en) | 1984-10-31 | 1984-10-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16530984U JPH056543Y2 (en) | 1984-10-31 | 1984-10-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6180466U true JPS6180466U (en) | 1986-05-28 |
| JPH056543Y2 JPH056543Y2 (en) | 1993-02-19 |
Family
ID=30723162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16530984U Expired - Lifetime JPH056543Y2 (en) | 1984-10-31 | 1984-10-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH056543Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04118673U (en) * | 1991-04-02 | 1992-10-23 | 日置電機株式会社 | resistance measuring device |
| JPH09269340A (en) * | 1996-04-02 | 1997-10-14 | Oki Electric Ind Co Ltd | Voltage-current converter |
-
1984
- 1984-10-31 JP JP16530984U patent/JPH056543Y2/ja not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04118673U (en) * | 1991-04-02 | 1992-10-23 | 日置電機株式会社 | resistance measuring device |
| JPH09269340A (en) * | 1996-04-02 | 1997-10-14 | Oki Electric Ind Co Ltd | Voltage-current converter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH056543Y2 (en) | 1993-02-19 |
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