DE892472C - AC voltmeter with suppressed starting area - Google Patents
AC voltmeter with suppressed starting areaInfo
- Publication number
- DE892472C DE892472C DEL9744A DEL0009744A DE892472C DE 892472 C DE892472 C DE 892472C DE L9744 A DEL9744 A DE L9744A DE L0009744 A DEL0009744 A DE L0009744A DE 892472 C DE892472 C DE 892472C
- Authority
- DE
- Germany
- Prior art keywords
- voltmeter
- suppressed
- starting area
- series
- measuring
- 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
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/005—Circuits for altering the indicating characteristic, e.g. making it non-linear
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Description
In der Meß- und Regeltechnik tritt häufig das Problem auf, einen bestimmten Wechselspannungsbereich auf der Skala von Meßgeräten zu dehnen, um in diesem Bereich eine feinere Ablesung zu erhalten. Solche Geräte sind grundsätzlich seit langem bekannt, und wenn es sich um Drehspul-oder Dreheisenmeßgeräte handelt, so wird der Nullpunkt meist unter Anwendung mechanischer Mittel unterdrückt. Bei einem Drehspulmeßwerk kann die Nullpunktunterdrückung auch unter Vorschaltung eines Trockengleichrichters mit parallel geschalteter, schwach belasteter Glühlampe erfolgen. Beide Möglichkeiten weisen aber gewisse Mängel auf. Bei mechanisch unterdrücktem Nullpunkt ist nämlich eine Nullpunktkonrektur nicht möglich und bei der Anordnung mit paraööeö geschalteter Glühlampe ist die Glühlampe ein verhältnismäßig störanfälliges Element der Meßanordnung. In measurement and control technology, the problem often arises, one to stretch certain AC voltage range on the scale of measuring instruments to in to get a finer reading in this area. Such devices are fundamental known for a long time, and when it comes to moving coil or moving iron measuring devices, so the zero point is mostly suppressed using mechanical means. at a moving-coil measuring mechanism, the zero point suppression can also be performed with a Dry rectifier with a lightly loaded incandescent lamp connected in parallel. However, both options have certain shortcomings. With mechanically suppressed Zero point, a zero point correction is not possible and with the arrangement with a paraööeö incandescent lamp, the incandescent lamp is relatively susceptible to failure Element of the measuring arrangement.
Die Erfindung betrifft einen Wechselspannungsmesser mit unterdrücktem Anfangsbereich. Die geschilderten Mängel bekannter Anordnungen werden erfindungsgemäß dadurch vermieden, daß in Reihe mit einem Dreheiseninstrument eine sättigbare Drossel geschaltet ist. Die sättigbare Drossel wird zweckmäßig so ausgelegt, daß sie einen ausgeprägten Knick in der Magnetisierungskurve zeigt, und der auf der Skala unterdrücke Meßbereich wird in den Abschnitt geringer Stromänderung gelegt. Bei diesem Wechselspannungsmesser handelt es sich um eine sowohl mechanisch als auch elektrisch robuste Einrichtung, und außerdem ist dabei eine Sicherung Nullpunktkorrektur möglich. The invention relates to an alternating voltmeter with suppressed Starting area. The described shortcomings of known arrangements are in accordance with the invention avoided by having a saturable choke in series with a moving iron instrument is switched. The saturable choke is expediently designed so that it has a shows pronounced kink in the magnetization curve, and suppress the one on the scale The measuring range is placed in the section with little current change. With this alternating voltmeter it is a mechanically as well as electrically robust device, and a backup of the zero point correction is also possible.
In Fig. 1 der Zeichnung ist schematisch eine Anordnung gemäß der Erfindung dargestellt. An den Klemmen 1, 2 liegt die zu messende Wechselspannung. 3 ist eine sättigbare Drossel mit möglichst ausgeprägten Knick in der Magnetisierungskurve. In Fig. 1 of the drawing, an arrangement according to the Invention shown. The alternating voltage to be measured is applied to terminals 1, 2. 3 is a saturable choke with the most pronounced kink in the magnetization curve.
Sie liegt in Reihe geschaltet mit einem Dreheiisenlinstrument 6 an der zu messenden Wechselspannung. Zum Abgleich der Kennlinie können noch Vor- oder Nebenwiderstände 4 bzw. 5 verwendet werden.It is connected in series with a moving iron instrument 6 the alternating voltage to be measured. To adjust the characteristic, you can also use pre- or Shunt resistors 4 or 5 can be used.
Die sättigbare Drossel 3 hat eine Charakteristik, die in Fig. 2 dargestellt ist. Nach Überschreiten einer gewissen unteren Spannungsgrenze steigt der Strom plötzlich stark an. Dadurch ergibt sich eine Ünterdrückung des Anfangsbereichs des Spannungsmessers auf der Skala, so-daß eine Feinablesung innerhalb des geforderten Bereichs möglich ist. Dieser Bereich kann im Rahmen der ,durch Das Instrument 6 gezogenen Begrenzung beliebig weit gedehnt werden. The saturable reactor 3 has a characteristic shown in FIG is. After a certain lower voltage limit is exceeded, the current increases suddenly strong. This results in a suppression of the initial range of the Voltmeter on the scale so that a fine reading is within the required range Area is possible. This area can be used within the framework of Das Instrument 6 drawn limit can be stretched as far as desired.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL9744A DE892472C (en) | 1951-08-03 | 1951-08-03 | AC voltmeter with suppressed starting area |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL9744A DE892472C (en) | 1951-08-03 | 1951-08-03 | AC voltmeter with suppressed starting area |
Publications (1)
Publication Number | Publication Date |
---|---|
DE892472C true DE892472C (en) | 1953-10-08 |
Family
ID=7258134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL9744A Expired DE892472C (en) | 1951-08-03 | 1951-08-03 | AC voltmeter with suppressed starting area |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE892472C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1046178B (en) * | 1954-04-07 | 1958-12-11 | Licentia Gmbh | Moving iron measuring device based on the round coil principle with fixed and moving iron, in which means are provided for influencing the scale |
-
1951
- 1951-08-03 DE DEL9744A patent/DE892472C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1046178B (en) * | 1954-04-07 | 1958-12-11 | Licentia Gmbh | Moving iron measuring device based on the round coil principle with fixed and moving iron, in which means are provided for influencing the scale |
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