JPH0772187A - Voltage measuring instrument - Google Patents
Voltage measuring instrumentInfo
- Publication number
- JPH0772187A JPH0772187A JP21974793A JP21974793A JPH0772187A JP H0772187 A JPH0772187 A JP H0772187A JP 21974793 A JP21974793 A JP 21974793A JP 21974793 A JP21974793 A JP 21974793A JP H0772187 A JPH0772187 A JP H0772187A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- integrator
- time
- switch
- measured
- 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.)
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- Measurement Of Current Or Voltage (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は被測定電圧を精度よく
測定する電圧測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage measuring device for accurately measuring a voltage to be measured.
【０００２】[0002]
【従来の技術】一般にディジタル・マルチメータなど比
較的スピードが必要でない用途には積分型Ａ／Ｄ変換器
が広く使われている。その理由としては積分型Ａ／Ｄ変
換器は入力の積分時間を誘導雑音成分の周期の整数倍に
設定することにより誘導雑音周波数成分を除去できる特
性を持つためである。2. Description of the Related Art In general, an integral type A / D converter is widely used for applications such as digital multimeters where relatively high speed is not required. The reason is that the integration type A / D converter has a characteristic that the induction noise frequency component can be removed by setting the integration time of the input to an integral multiple of the period of the induction noise component.
【０００３】図５に従来の積分型Ａ／Ｄ変換器の構造を
示す。図中１は積分器、２はこの積分器１の入力端子を
示す。積分器１の入力端子２にはスイッチＳ１を通じて
被測定電圧ＥX を入力する入力端子３が接続される。更
に入力端子２にはスイッチＳ２を通じて基準電圧源４が
接続される。積分器１の出力側には電圧比較器５が接続
され、出力端子６に積分器１の積分電圧の極性に対応し
た論理信号ＶB を出力する。つまり積分器１の積分電圧
が０であれば０電位（Ｈ論理）を出力するが、積分電圧
がわずかでも負になると負の一定電圧（Ｌ論理）を出力
する。Ｓ３は積分器１の積分電圧を初期状態に戻すため
のリセットスイッチを示す。FIG. 5 shows the structure of a conventional integrating A / D converter. In the figure, 1 is an integrator, and 2 is an input terminal of the integrator 1. The input terminal 2 of the integrator 1 is connected to the input terminal 3 for inputting the measured voltage E X through the switch S1. Further, the reference voltage source 4 is connected to the input terminal 2 through the switch S2. The voltage comparator 5 is connected to the output side of the integrator 1, and outputs the logic signal V B corresponding to the polarity of the integrated voltage of the integrator 1 to the output terminal 6. That is, if the integrated voltage of the integrator 1 is 0, 0 potential (H logic) is output, but if the integrated voltage becomes negative even slightly, a constant negative voltage (L logic) is output. S3 is a reset switch for returning the integrated voltage of the integrator 1 to the initial state.
【０００４】待機中はリセットスイッチＳ３がオンに制
御され、積分器１は初期状態（０電位）を出力する。測
定開始時にリセットスイッチＳ３をオフに制御し、スイ
ッチＳ１をオンに制御して被測定電圧ＥX を積分器１に
入力する。被測定電圧ＥX を図６Ａに示すように一定時
間Ｔ1 （この時間を商用電源周波数の整数倍に採ると誘
導ノイズを除去できる）積分し、その時間Ｔ1 後にスイ
ッチＳ１をオフにし、代わってスイッチＳ２をオンに制
御して基準電圧源４を積分器１の入力端子２に接続す
る。During standby, the reset switch S3 is controlled to be turned on, and the integrator 1 outputs the initial state (0 potential). At the start of measurement, the reset switch S3 is turned off and the switch S1 is turned on to input the measured voltage E x to the integrator 1. As shown in FIG. 6A, the measured voltage E X is integrated for a fixed time T 1 (induction noise can be removed by taking this time as an integral multiple of the commercial power supply frequency), and after that time T 1 , the switch S1 is turned off and replaced. Then, the switch S2 is turned on to connect the reference voltage source 4 to the input terminal 2 of the integrator 1.
【０００５】この切換のタイミングｔ1 から図６Ｃに示
すクロックＣＰの計数を開始する。積分器１の積分電圧
が０に戻り、出力端子６の論理値ＶB が反転するタイミ
ングｔ2 でクロックＣＰの計数を停止し、この計数値か
ら時間ＴX を計測する。時間ＴX は被測定電圧の値に対
応し、被測定電圧ＥX をクロックＣＰの周期の分解能で
ＡＤ変換したことになる。尚、ＡＤ変換の分解能を上げ
るには入力側に基準電圧源４の例えば１／１００の電圧
を持つ第２の基準電圧源を設け、時点ｔ 2 の終了電圧
（正側に行過ぎた電圧）を再度０に戻る方向に積分し、
この積分時間を加えることにより、時間ＴX の更に１／
１００の分解能で端数部分をＡＤ変換することができ
る。Timing of this switching t1Shown in Figure 6C
The counting of the clock CP is started. Integrated voltage of integrator 1
Returns to 0, and the logical value V of the output terminal 6BTaimi reverses
Ng t2Stop the counting of the clock CP at
From time TXTo measure. Time TXIs the value of the measured voltage
The measured voltage EXWith the resolution of the cycle of the clock CP
This means AD conversion. In addition, increase the resolution of AD conversion
Voltage on the input side of the reference voltage source 4, for example, 1/100
And a second reference voltage source having 2End voltage of
(Voltage that has passed too much on the positive side) is integrated in the direction of returning to 0 again,
By adding this integration time, the time TXFurther 1 /
The fractional part can be AD converted with a resolution of 100
It
【０００６】[0006]
【発明が解決しようとする課題】従来の積分型ＡＤ変換
器を利用した電圧測定装置は入力切換用スイッチの数が
多く構成が複雑である。また基準電圧源を２個設け、時
間ＴX の端数部分をＡＤ変換するように構成する場合は
基準電圧源の電圧比が正確である必要がある。また基準
電圧源の電圧比を定期的に測定し校正する必要がある。A voltage measuring device using a conventional integrating AD converter has a large number of input changeover switches and has a complicated structure. Also provided two reference voltage source, when constituting the fractional part of the time T X to AD conversion voltage ratio of the reference voltage source is required to be accurate. It is also necessary to periodically measure and calibrate the voltage ratio of the reference voltage source.
【０００７】この発明の目的は入力切換用スイッチの数
を少なくし、構成を簡素化することができる積分型ＡＤ
変換器を利用して電圧測定装置を提供しようとするもの
である。また基準電圧源を複数設けなくても分解能の高
いＡＤ変換を行なうことができる電圧測定装置を提供し
ようとするものである。An object of the present invention is to reduce the number of input changeover switches and to simplify the structure, thereby providing an integral type AD.
It is intended to provide a voltage measuring device using a converter. Another object of the present invention is to provide a voltage measuring device capable of performing high resolution AD conversion without providing a plurality of reference voltage sources.
【０００８】[0008]
【課題を解決するための手段】この発明では被測定電圧
と、この被測定電圧と逆極性の既知の電圧の基準電圧と
を重畳した重畳電圧を積分器に与える状態と被測定電圧
のみを積分器に与える状態に切換る切換スイッチと、重
畳電圧を積分器に与える状態と被測定電圧のみを積分器
に与える状態を一定時間内に実行して１つの測定周期と
し、これを所定の回数繰返し実行させる制御器と、各測
定周期において各測定周期の終了時点における積分器の
積分電圧が可及的に予め予定した電圧に収歛するように
重畳電圧を積分器に与える時間を制御するスイッチ制御
手段と、重畳電圧を積分器に与える時間の累積値を
ＴRS、測定周期を加算した時間をＴS 、基準電圧をＥS
としたとき被測定電圧ＥX をＥX ＝ＥS ・ＴS ／ＴS に
より算出する演算手段とによって構成するものである。SUMMARY OF THE INVENTION In the present invention, only the measured voltage and the measured voltage and a reference voltage of a known voltage having a polarity opposite to that of the measured voltage are applied to the integrator and only the measured voltage is integrated. Changeover switch for switching to the condition where the voltage is applied to the integrator, and the condition that the superimposed voltage is applied to the integrator and the condition that only the measured voltage is applied to the integrator are executed within a fixed time to make one measurement cycle, and this is repeated a predetermined number of times. The controller to be executed and the switch control to control the time to give the superposed voltage to the integrator so that the integrated voltage of the integrator at the end of each measurement cycle converges to the predetermined voltage as much as possible in each measurement cycle. Means, the cumulative value of the time for giving the superimposed voltage to the integrator is T RS , the time obtained by adding the measurement periods is T S , and the reference voltage is E S.
When that constitute the calculating means for calculating the measured voltage E X by E X = E S · T S / T S.
【０００９】この発明では更に最終測定周期における積
分器の積分電圧をＥAn、測定開始時における積分器の積
分電圧をＥA1、積分器に基準電圧を与える積分時定数を
Ｒ・Ｃとしたとき（ＥAn−ＥA1）・Ｒ・Ｃ／ＴS によっ
て端数値を算出する端数値算出手段を設け、この端数値
を被測定電圧ＥX に加算する。この発明による電圧測定
装置によれば入力切換スイッチは１個でよく、構成を簡
素化することができる。また基準電圧源も１個で済むか
ら基準電圧相互の電圧値の比を管理する必要がない。よ
って取扱いも簡単になる利点が得られる。In the present invention, when the integrated voltage of the integrator in the final measurement cycle is E An , the integrated voltage of the integrator at the start of measurement is E A1 , and the integration time constant for giving the reference voltage to the integrator is R · C. (E An −E A1 ) · R · C / T S is provided with a fractional value calculating means for calculating a fractional value, and the fractional value is added to the measured voltage E X. According to the voltage measuring device of the present invention, only one input changeover switch is required, and the structure can be simplified. Further, since only one reference voltage source is required, it is not necessary to manage the ratio of the voltage values of the reference voltages. Therefore, there is an advantage that the handling is simple.
【００１０】[0010]
【実施例】図１にこの発明の一実施例を示す。図中１は
積分器を示す。この例では積分器１に２本の積分抵抗器
Ｒ１とＲ２を設け、これら２つの積分抵抗器Ｒ１とＲ２
を入力端子２Ａと２Ｂに接続し、２入力型の積分器を構
成した場合を示す。入力端子２Ａに外部入力端子３を接
続し、被測定電圧ＥX を与える。これと共に入力端子２
Ｂには切換スイッチＳ２を通じて基準電圧源４を接続す
る。FIG. 1 shows an embodiment of the present invention. In the figure, 1 indicates an integrator. In this example, the integrator 1 is provided with two integrating resistors R1 and R2, and these two integrating resistors R1 and R2 are provided.
Is connected to the input terminals 2A and 2B to form a 2-input type integrator. The external input terminal 3 is connected to the input terminal 2A, and the measured voltage E X is applied. Along with this, input terminal 2
A reference voltage source 4 is connected to B through a changeover switch S2.
【００１１】積分器１の出力側に瞬時変換型のＡＤ変換
器７を接続し、制御器８から与えられる制御信号によ
り、その時点における積分器１の積分電圧をＡＤ変換す
る。瞬時変換型ＡＤ変換器としては各種既存の構造のＡ
Ｄ変換器を用いることができる。制御器８は例えばマイ
クロコンピュータによって構成することができる。切換
スイッチＳ２は制御器８によってオンの状態と、オフの
状態に切換制御される。オンの状態に制御されることに
より積分器１には被測定電圧ＥX と基準電圧源４の基準
電圧ＥS が重畳して与えられる。また切換スイッチＳ２
がオフの状態では積分器１には被測定電圧ＥX だけが与
えられる。An instantaneous conversion type AD converter 7 is connected to the output side of the integrator 1, and the integrated voltage of the integrator 1 at that time is AD-converted by a control signal given from the controller 8. Instantaneous conversion type A / D converter with various existing structures
A D converter can be used. The controller 8 can be composed of, for example, a microcomputer. The changeover switch S2 is controlled by the controller 8 to be switched between an on state and an off state. By being controlled to the ON state, the voltage to be measured E X and the reference voltage E S of the reference voltage source 4 are applied to the integrator 1 in a superposed manner. In addition, the changeover switch S2
When is off, the integrator 1 is supplied with only the measured voltage E x .
【００１２】図２を用いて動作を説明する。時点ｔ1 で
積分器１の積分電圧を瞬時にＡＤ変換器７でＡＤ変換す
る。このＡＤ変換値をＥA1とし、制御器８に内蔵したメ
モリに記憶する。これと共に切換スイッチＳ２をオンに
制御し積分器１に重畳電圧を与える。初回の第１測定周
期では重畳電圧を積分する時間ＴR1は予め設定されてい
る或る一定時間に選定される。従って重畳電圧を積分す
る積分時間ＴR1を経過した時点で切換スイッチＳ２は制
御器８によりオフの状態に制御され、爾後時点ｔ2 まで
被測定電圧ＥX のみが積分器１に与えられる。The operation will be described with reference to FIG. At time t 1 , the integrated voltage of the integrator 1 is instantly AD-converted by the AD converter 7. The AD conversion value is set as E A1 and stored in the memory built in the controller 8. At the same time, the changeover switch S2 is controlled to be turned on, and the superimposed voltage is given to the integrator 1. In the first measurement cycle of the first time, the time T R1 for integrating the superimposed voltage is selected to be a certain preset time. Therefore, when the integration time T R1 for integrating the superimposed voltage has elapsed, the changeover switch S2 is controlled to the off state by the controller 8, and only the measured voltage E X is given to the integrator 1 until the time t 2 after that.
【００１３】時点ｔ2 においてＡＤ変換器７で積分器１
の積分電圧をＡＤ変換する。そのＡＤ変換値をＥA2とす
る。ＥA2が正極性の値であれば制御器８は次回の測定周
期におけるスイッチＳ２のオン時間ＴR を長くする。負
極性の値であれば制御器８は次回の測定周期におけるス
イッチＳ２のオン時間を短かくする。この制御動作によ
り各測定周期の終了点における積分器１の積分電圧は予
め設定した、例えば共通電位に等しい０Ｖに収斂する。At time t 2 , the AD converter 7 causes the integrator 1
AD-converts the integrated voltage of. The AD conversion value is E A2 . If E A2 has a positive value, the controller 8 lengthens the ON time T R of the switch S2 in the next measurement cycle. If it is a negative value, the controller 8 shortens the on time of the switch S2 in the next measurement cycle. By this control operation, the integrated voltage of the integrator 1 at the end point of each measurement cycle converges to a preset voltage, for example, 0 V equal to the common potential.
【００１４】測定周期を繰返し最終測定周期の時点ｔn
で積分器１の積分電圧をＡＤ変換し、その値をＥAn、時
点ｔ1 〜ｔn までの間の時間（以下この時間を変換時間
と称す）をＴS 、各測定周期におけるスイッチＳ２のオ
ン時間ＴR1，ＴR2，ＴR3…Ｔ Rnの総和ＴR1＋ＴR2＋ＴR3
…ＴRn＝ＴRsとすると、被測定電圧ＥX は、 ＥX ＝ＥS ・ＴRs／ＴS ＋（ＥAn−ＥA1）・ＲＣ／ＴS …（１） で求められる。スイッチ２のオン時間の総和ＴRs及びＥ
X を算出する演算は制御器８で行なわれる。演算結果は
表示器９に表示される。（１）式において、第１項は被
測定電圧ＥX の主となる値、第２項は端数値である。第
２項の時定数Ｒ・Ｃは積分器１の積分抵抗器Ｒ２と積分
コンデンサＣ１の時定数を指す。The measurement cycle is repeated and the time t of the final measurement cycle is reached.n
AD-converts the integrated voltage of integrator 1 with the value EAn,Time
Point t1~ TnTime between (this time is converted time below
T)S, Switch S2 on in each measurement cycle
Time TR1, TR2, TR3… T RnSum of TR1+ TR2+ TR3
… TRn= TRsThen, the measured voltage EXIs EX= ES・ TRs/ TS+ (EAn-EA1) ・ RC / TS… It is calculated by (1). Total time T of switch 2 onRsAnd E
XThe controller 8 performs the calculation for calculating The calculation result is
It is displayed on the display unit 9. In equation (1), the first term is
Measuring voltage EXThe second term is the fractional numerical value. First
The time constant R · C of the second term is integrated with the integration resistor R2 of the integrator 1.
Refers to the time constant of the capacitor C1.
【００１５】オン時間ＴR を計測する分解能を１μｓ、
変換時間ＴS を１００ｍｇとした場合、ＴRSは０〜１０
０ｍｓの範囲で変化することになる。１００ｍｓを１μ
ｓの分解能で計測した場合、１０5 カウント、つまり５
桁の計測が可能である。ＡＤ変換器７として８ビットの
ＡＤ変換器を用いるものとした場合、第２項として２桁
を採る設計は可能である。この結果として変換時間を１
００ｍｓに採った場合は第１項は５桁、第２項は２桁、
計７桁。The resolution for measuring the on-time T R is 1 μs,
When the conversion time T S is 100 mg, T RS is 0 to 10
It will change in the range of 0 ms. 1 ms for 100 ms
When measured with a resolution of s, 10 5 counts, that is, 5
Digits can be measured. When an 8-bit AD converter is used as the AD converter 7, it is possible to design the second term with two digits. As a result, the conversion time is 1
If it is set to 00 ms, the first term is 5 digits, the second term is 2 digits,
7 digits in total.
【００１６】変換時間を２０ｍｓに採った場合は第１項
は４桁、第２項は２桁、計６桁。変換時間を２ｍｓに採
った場合は第１項は３桁、第２項は２桁、計５桁。のＡ
Ｄ変換器が得られる。変換時間ＴS を１００ｍｓに採っ
た場合は図３に示すように基本波Ｗが１０Ｈｚのノーマ
ルモードの雑音除去特性を得ることができる。つまり１
０Ｈｚ間隔で雑音除去特性を得ることができる。この結
果５Ｗ＝５０Ｈｚと６Ｗ＝６０Ｈｚの双方で雑音除去特
性を得ることができ、５０Ｈｚと６０Ｈｚの双方に共用
することができる。また変換時間ＴS を１００ｍｓに採
った場合は測定周期の回数ｎは例えばｎ＝３３回に選定
することができ、１測定周期は３．０３ｍｓ程度とな
る。変換時間ＴS の他の例としては２０ｍｓと１６．６
６ｍｓとが考えられる。２０ｍｓは５０Ｈｚ用、１６．
６６ｍｓは６０Ｈｚ用として用いられる。When the conversion time is set to 20 ms, the first term has 4 digits, the second term has 2 digits, and a total of 6 digits. When the conversion time is set to 2 ms, the first term is 3 digits, the second term is 2 digits, and 5 digits in total. Of A
A D converter is obtained. When the conversion time T S is set to 100 ms, it is possible to obtain the normal mode noise elimination characteristics in which the fundamental wave W is 10 Hz as shown in FIG. That is 1
Noise removal characteristics can be obtained at 0 Hz intervals. As a result, the noise elimination characteristics can be obtained at both 5W = 50Hz and 6W = 60Hz, and can be shared for both 50Hz and 60Hz. When the conversion time T S is set to 100 ms, the number of measurement cycles n can be selected to be n = 33, for example, and one measurement cycle is about 3.03 ms. Other examples of the conversion time T S are 20 ms and 16.6.
6 ms is considered. 20 ms is for 50 Hz, 16.
66 ms is used for 60 Hz.
【００１７】この発明による電圧測定装置の誤差要因は
積分抵抗器Ｒ１とＲ２の抵抗比だけである。積分コンデ
ンサＣ１の容量比値は（１）式の下位桁のみで容量値が
１％を越える変化をしなければ誤差は生じない。切換ス
イッチＳ２は１μｓの１／１００の１０ｎｓのオン・オ
フの繰返しが同じであればよい。例えばＣＭＯＳのスイ
ッチ素子を用いることができる。よって安価なスイッチ
素子を用いることができる。The only error factor of the voltage measuring device according to the present invention is the resistance ratio of the integrating resistors R1 and R2. The capacitance ratio value of the integrating capacitor C1 is only the lower digit of the equation (1), and no error occurs unless the capacitance value changes by more than 1%. It suffices that the change-over switch S2 has the same on / off repetition for 10 ns which is 1/100 of 1 μs. For example, a CMOS switch element can be used. Therefore, an inexpensive switch element can be used.
【００１８】尚、図４はこの発明の変形実施例を示す。
この実施例では正と負の基準電圧源４Ａと４Ｂを設け、
被測定電圧ＥX の極性に応じて自動的に逆極性の基準電
圧を選択する構造とした場合を示す。但し実用上は被測
定電圧ＥX の入力の向を選択して基準電圧と被測定電圧
を逆極性となるようにすればよいから、必ずしも正と負
の基準電圧を必要とするものではない。Incidentally, FIG. 4 shows a modified embodiment of the present invention.
In this embodiment, positive and negative reference voltage sources 4A and 4B are provided,
The case where the reference voltage having the opposite polarity is automatically selected according to the polarity of the measured voltage E X is shown. However, in practice, it is sufficient to select the input direction of the measured voltage E X so that the reference voltage and the measured voltage have opposite polarities, so that the positive and negative reference voltages are not necessarily required.
【００１９】[0019]
【発明の効果】以上説明したように、この発明によれば
１個の切換スイッチＳ２をオン、オフ制御するだけで積
分型ＡＤ変換器を利用した電圧測定装置を構成できる。
従って従来の積分型ＡＤ変換器の構造より簡素化され安
価に作ることができる。然も基準電圧源は基本的に１個
で済むから、基準電圧源の電圧比を計測し、校正を行な
う等のわずらわしい作業を必要としない。よって取扱も
簡単となり、初期の性能を長期にわたって維持すること
ができる利点も得られる。As described above, according to the present invention, it is possible to construct the voltage measuring device using the integral type AD converter by simply turning on and off the single changeover switch S2.
Therefore, the structure is simpler and cheaper than the structure of the conventional integral AD converter. However, since only one reference voltage source is basically required, no troublesome work such as measuring the voltage ratio of the reference voltage source and performing calibration is required. Therefore, it is easy to handle, and there is an advantage that the initial performance can be maintained for a long time.
【図１】この発明の一実施例を示す接続図。FIG. 1 is a connection diagram showing an embodiment of the present invention.
【図２】図１の実施例の動作を説明するための波形図。FIG. 2 is a waveform diagram for explaining the operation of the embodiment of FIG.
【図３】積分型ＡＤ変換器のノーマルモード雑音除去特
性を説明するためのグラフ。FIG. 3 is a graph for explaining a normal mode noise elimination characteristic of the integral type AD converter.
【図４】この発明の変形実施例を示す接続図。FIG. 4 is a connection diagram showing a modified embodiment of the present invention.
【図５】従来の技術を説明するための接続図。FIG. 5 is a connection diagram for explaining a conventional technique.
【図６】図５の動作を説明するための波形図。6 is a waveform diagram for explaining the operation of FIG.
１ 積分器 ２Ａ，２Ｂ 積分器の入力端子 ３ 外部入力端子 ４ 基準電圧源 Ｓ２ 切換スイッチ ７ 瞬時変換型のＡＤ変換器 ８ 制御器 1 integrator 2A, 2B input terminal of integrator 3 external input terminal 4 reference voltage source S2 changeover switch 7 instantaneous conversion type AD converter 8 controller
Claims (2)
の電圧を持つ基準電圧とを重畳した重畳電圧を積分器に
与える状態及び被測定電圧のみを積分器に与える状態に
切換る切換スイッチと、重畳電圧を積分器に与える状態
と被測定電圧のみを積分器に与える状態を一定時間内に
実行して１測定周期とし、これを所定の回数繰返し実行
させる制御器と、各測定周期において各測定周期の終了
時点における積分器の積分電圧が可及的に予定した電圧
に収歛するように重畳電圧を上記積分器に与える時間を
制御するスイッチ制御手段と、重畳電圧を積分器に与え
る時間の累積値をＴRS、測定周期の時間を加算した時間
をＴS 、基準電圧をＥSとしたとき、被測定電圧ＥX を
ＥX ＝ＥS ・ＴRS／ＴS によって算出する演算手段とに
よって構成したことを特徴とする電圧測定装置。1. A switch for switching a state in which a superposed voltage obtained by superposing a measured voltage and a reference voltage having a voltage having a polarity opposite to that of the measured voltage is applied to an integrator and a state in which only the measured voltage is applied to the integrator. A switch, a controller that applies the superimposed voltage to the integrator and a condition that only the measured voltage is applied to the integrator within a fixed time to make one measurement cycle, and repeatedly executes this for a predetermined number of times, and each measurement cycle. In, the switch control means for controlling the time to give the superimposed voltage to the integrator so that the integrated voltage of the integrator at the end of each measurement period converges to the scheduled voltage as much as possible, and the superimposed voltage to the integrator. When the cumulative value of the given time is T RS , the time obtained by adding the time of the measurement cycle is T S , and the reference voltage is E S , the measured voltage E X is calculated by E X = E S · T RS / T S Comprised of arithmetic means and Voltage measuring device according to claim.
測定開始時点における積分器の積分電圧をＥA1、最終測
定周期の終了時点における積分器の積分電圧をＥAn、積
分器の基準電圧に対する積分時定数をＣＲとした場合
（ＥA1−ＥAn）・Ｃ・Ｒ／ＴS により補正値を算出し、
請求項１で算出した被測定電圧ＥX に加算するように構
成したことを特徴とする電圧測定装置。2. The voltage measuring device according to claim 1, wherein
When the integrated voltage of the integrator at the start of measurement is E A1 , the integrated voltage of the integrator at the end of the final measurement cycle is E An , and the integration time constant for the reference voltage of the integrator is CR (E A1 −E An ).・ Calculate the correction value by C ・ R / T S ,
A voltage measuring device configured to be added to the measured voltage E X calculated in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21974793A JPH0772187A (en) | 1993-09-03 | 1993-09-03 | Voltage measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21974793A JPH0772187A (en) | 1993-09-03 | 1993-09-03 | Voltage measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0772187A true JPH0772187A (en) | 1995-03-17 |
Family
ID=16740364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21974793A Withdrawn JPH0772187A (en) | 1993-09-03 | 1993-09-03 | Voltage measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0772187A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009034319A (en) * | 2007-08-01 | 2009-02-19 | Ito Choutanpa Kk | Potential treatment device |
| JP2012060350A (en) * | 2010-09-08 | 2012-03-22 | Mitsubishi Electric Corp | Analog input device |
-
1993
- 1993-09-03 JP JP21974793A patent/JPH0772187A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009034319A (en) * | 2007-08-01 | 2009-02-19 | Ito Choutanpa Kk | Potential treatment device |
| JP2012060350A (en) * | 2010-09-08 | 2012-03-22 | Mitsubishi Electric Corp | Analog input device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001107 |