DE964701C - Method and arrangement for measuring partial impedances with the aid of an impedance converter - Google Patents
Method and arrangement for measuring partial impedances with the aid of an impedance converterInfo
- Publication number
- DE964701C DE964701C DEW18496A DEW0018496A DE964701C DE 964701 C DE964701 C DE 964701C DE W18496 A DEW18496 A DE W18496A DE W0018496 A DEW0018496 A DE W0018496A DE 964701 C DE964701 C DE 964701C
- Authority
- DE
- Germany
- Prior art keywords
- impedance
- impedance converter
- arrangement
- input
- impedances
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
Die Erfindung betrifft ein Verfahren und eine Anordnung zur Messung von Teilimpedanzen. The invention relates to a method and an arrangement for measurement of partial impedances.
Teilimpedanzen wurden bisher mit der Wagnerbrücke #1,#2,#3,#x1 (Abb. 1) gemessen. Hierbei muß je nach der Größe der mit der zu messenden Teilimpedanz #x1 1 gekoppelten Teilimpedanzen #x2 2 und X8 ein Hilfsbrückenzweig R4, Rs abgeglichen werden, so daß kein Potentialunterschied zwischen b und c besteht Dabei ergibt sich der Nachteil, daß je nach Größe von #x3 ein Hilfsbrckenzweig #4, #5 abgeglichen werden muß. Bei schnellen Schwankungen von MPCX3 kann der entsprechende Abgleich von #5 nicht genau genug oder gar nicht durchgeführt werden. Partial impedances have so far been measured with the Wagner bridge # 1, # 2, # 3, # x1 (Fig. 1) measured. Here, depending on the size of the partial impedance to be measured # x1 1 coupled partial impedances # x2 2 and X8 an auxiliary bridge branch R4, Rs balanced so that there is no potential difference between b and c the disadvantage that, depending on the size of # x3, an auxiliary bridge branch # 4, # 5 is aligned must become. In the event of rapid fluctuations in the MPCX3, the corresponding adjustment # 5 cannot be performed accurately enough or not at all.
Diese Nachteile werden dadurch vermieden, daß erfindungsgemäß mit Hilfe eines an sich bekannten Impedanzwandlers die nicht zu messenden Teilimpedanzen unwirksam gemacht werden. These disadvantages are avoided by using the invention With the help of an impedance converter known per se, the partial impedances that are not to be measured be rendered ineffective.
Der hochohmige Eingang des Impedanzwandlers IW (Abb. 2) wird durch Punkt b leistungslos gesteuert. Der niederohmige Ausgang des Wandlers wird an Punkt c angeschlossen, der das gleiche Potential wie Punkt b aufweist, wodurch die verlangte Potentialgleichheit zwischen b und c erhalten bleibt. Der Impedanzwandler kann auch gemäß dar gestrichelten Darstellung in Abb 2 mit seinem Eingang parallel zu #3 geschaltet werden, was sich bei entsprechender Brückendimensionierung auf die Genauigkeit auswirkt. Bei der Messung von Teilimpedanzen mit Hilfe eines Impedanzwandlers kann die Bestimmung von #x1 außer mit Hilfe einer Brücke selbstverständlich auch auf jede be liebige andere Art durchgeführt werden, z. B. durch eine Stromspannungsmessung. The high-resistance input of the impedance converter IW (Fig. 2) is through Point b controlled without power. The low-resistance output of the converter is at point c connected, which has the same potential as point b, whereby the required Equal potential between b and c is preserved. The impedance converter can also connected with its input parallel to # 3 according to the dashed line in Fig. 2 which affects the accuracy if the bridge is dimensioned accordingly. When measuring partial impedances with the aid of an impedance converter, the determination from # x1 to any other, of course, except with the help of a bridge other type, e.g. B. by a voltage measurement.
Der Impedanzwandler soll einen möglichst hochohmigen und definierten Eingangswiderstand aufweisen, damit bei Anschaltung, z. B. an die Meßbrücke, deren verlangte Genauigkeit erhalten bleibt. The impedance converter should be as high-resistance and defined as possible Have input resistance so that when connected, e.g. B. to the measuring bridge, whose required accuracy is retained.
Die Ausgangsspannung soll gleich der Eingangsspannung sein, und der Ausgangswiderstand soll so klein sein, daß die Ausgangsspannung bei Be. lastung durch die TeilimpedanzS3 nicht wesentlich absinkt. The output voltage should be equal to the input voltage, and the The output resistance should be so small that the output voltage at Be. burden does not decrease significantly due to the partial impedance S3.
Zum Beispiel kann mit einem Impedanzwandler gemäß dem in Abb. 3 dargestellten Prinzipschaltbild ein definierter Eingangswiderstand von I MQ und ein Ausgangswiderstand von < I5 M# erreicht werden. For example, with an impedance converter according to the one shown in fig Block diagram of a defined input resistance of I MQ and an output resistance of <I5 M # can be reached.
Durch die Anordnung zur Ausübung des Verfahrens gemäß der Erfindung ergeben sich gegenüber dem Bekannten folgende Vorteile: I. Die Abgleicharbeit des Wagnerschen Hilfszweiges #5 R5 fällt weg, weil der Impedanzwandler unabhängig von der Größe der Teilimpedanz #x3 die Potentialgleichhei-t zwischen b und c herstellt. By the arrangement for practicing the method according to the invention there are the following advantages over the familiar: I. The comparison work of the Wagner's auxiliary branch # 5 R5 is omitted because the impedance converter is independent of the size of the partial impedance # x3 establishes the equipotentiality between b and c.
2. Auch bei schnellen Schwankungen von R. 2 und #x3 ergibtsich die Möglichkeit, die Impedanz 1 über längere Zeit genau zu messen. 2. Even with rapid fluctuations in R. 2 and # x3, this results Possibility to measure the impedance 1 precisely over a longer period of time.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEW18496A DE964701C (en) | 1956-02-24 | 1956-02-24 | Method and arrangement for measuring partial impedances with the aid of an impedance converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEW18496A DE964701C (en) | 1956-02-24 | 1956-02-24 | Method and arrangement for measuring partial impedances with the aid of an impedance converter |
Publications (1)
Publication Number | Publication Date |
---|---|
DE964701C true DE964701C (en) | 1957-05-29 |
Family
ID=7596261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEW18496A Expired DE964701C (en) | 1956-02-24 | 1956-02-24 | Method and arrangement for measuring partial impedances with the aid of an impedance converter |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE964701C (en) |
-
1956
- 1956-02-24 DE DEW18496A patent/DE964701C/en not_active Expired
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