DE636338C - Device for measuring the impedance of consumers - Google Patents
Device for measuring the impedance of consumersInfo
- Publication number
- DE636338C DE636338C DET41645D DET0041645D DE636338C DE 636338 C DE636338 C DE 636338C DE T41645 D DET41645 D DE T41645D DE T0041645 D DET0041645 D DE T0041645D DE 636338 C DE636338 C DE 636338C
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- impedance
- branch
- consumers
- resistance
- 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
Einrichtung zur Messung des Schewiderstandes von Verbrauchern Gegenstand der Erfindung ist eine Einrichtung zur Messung des Scheinwiderstandes von an Verstärker angeschlossenen Verbrauchern, die es ermöglicht, die Messung vorzunehmen, während der Verstärker sich im Betrieb befindet. Ein besonderes Bedürfnis für solche Meßeinrichtungen besteht bei Rundfunkverteilungsnetzen, um die Belastung der einzelnen Schleifen des Netzes während des Betriebes feststellen zu können; damit die. verfügbare Verstärkerleistung so günstig -wie möglich verteilt werden kann.Device for measuring the resistance of consumers object The invention is a device for measuring the impedance of an amplifier connected consumers, which makes it possible to carry out the measurement while the amplifier is in operation. A special need for such measuring devices exists in broadcast distribution networks to reduce the load on the individual loops to be able to determine the network during operation; so that. available amplifier power can be distributed as cheaply as possible.
In der Abbildung ist die Schaltungsanordnung gemäß der Erfindung dargestellt.In the figure, the circuit arrangement according to the invention is shown.
,a und b sind dabei die Ausgangsklemmen des Verstärkers. Die Leistung wird an den Klemmen c und d abgenommen. ri und r2 sind zwei feste Meßwiderstände, R ist ein veränderlicher Widerstand, während X den Widerstand des angeschlossenen Verbrauchers darstellt., a and b are the output terminals of the amplifier. The power is taken from terminals c and d. ri and r2 are two fixed measuring resistors, R is a variable resistance, while X represents the resistance of the connected consumer.
Die Wechselspannungen an den Widerständen r1 und r2 werden in der gezeichneten Weise gleichgerichtet und die an den Widerständen r3 und r4 erzeugten Gleichspannungen durch Kompensation miteinander verglichen. Sind die Wechselspannungen an r, und r2 dem Betrage nach einander gleich, so sind auch die Gleichspannungen an r3 und r4 gleich, und das Gleichstrominstrument zeigt den Ausschlag o.The alternating voltages at the resistors r1 and r2 are in the rectified in the manner shown and those generated at resistors r3 and r4 DC voltages compared with each other by compensation. Are the alternating voltages at r and r2 are equal in magnitude to each other, then the DC voltages are also equal at r3 and r4 the same, and the direct current instrument shows the deflection o.
Durch die Gleichrichtung und die Trägheit des Instrumentes wird erreicht, daß die Phasenverschiebung zwischen den beiden Wechselspannungen keinen Einfluß auf die Abgleichung hat. Der maximal auftretende Fehler beträgt minus r1, d. h. der gemessene Scheinwiderstand R ist nur um r1 kleiner als der tatsächliche X. Durch Wahl von r1 hat man es in der Hand, den Fehler beliebig klein zu machen. Die Messung soll im Betrieb also während der Übertragung, von Sprache ,oder Musik vorgenommen werden. Dies bedeutet, daß die Meßfrequenz und damit alrso, auch der Absolutwert von X dauernd schwankt. Um trotzdem abgleichen zu können, werden durch Siebelemente im Brückenzweig der Meßeinrichtung so. schmale Frequenzgebiete zugeführt, daß sich der Scheinwiderstand in diesen Grenzen-nur unwesentlich ändert.The rectification and inertia of the instrument achieve that the phase shift between the two alternating voltages has no effect on the match did. The maximum error that can occur is minus r1, i.e. H. the measured impedance R is only r1 smaller than the actual X. Av If you choose r1, you can make the error as small as you want. The measurement should be carried out during operation, i.e. during the transmission, of speech or music will. This means that the measuring frequency and thus also the absolute value of X fluctuates continuously. In order to be able to adjust anyway, sieve elements are used in the bridge branch of the measuring device like this. narrow frequency ranges that are fed the impedance within these limits changes only insignificantly.
An Stelle der Kompensationsschaltung kann auch ein Schallwiedergabegerät als Indikator im Diagonalzweig der Brücke benutzt werden.A sound reproduction device can also be used in place of the compensation circuit used as an indicator in the diagonal branch of the bridge.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET41645D DE636338C (en) | Device for measuring the impedance of consumers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET41645D DE636338C (en) | Device for measuring the impedance of consumers |
Publications (1)
Publication Number | Publication Date |
---|---|
DE636338C true DE636338C (en) | 1936-10-09 |
Family
ID=7561077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DET41645D Expired DE636338C (en) | Device for measuring the impedance of consumers |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE636338C (en) |
-
0
- DE DET41645D patent/DE636338C/en not_active Expired
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