DE932119C - Circuit arrangement for measuring the ratio of mean value time to base time of individual electrical impulses of any shape, in particular for measuring the degree of transmission of photographic shutters - Google Patents
Circuit arrangement for measuring the ratio of mean value time to base time of individual electrical impulses of any shape, in particular for measuring the degree of transmission of photographic shuttersInfo
- Publication number
- DE932119C DE932119C DEC3008A DEC0003008A DE932119C DE 932119 C DE932119 C DE 932119C DE C3008 A DEC3008 A DE C3008A DE C0003008 A DEC0003008 A DE C0003008A DE 932119 C DE932119 C DE 932119C
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- circuit arrangement
- time
- ratio
- degree
- 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
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
- G04F10/10—Apparatus for measuring unknown time intervals by electric means by measuring electric or magnetic quantities changing in proportion to time
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B43/00—Testing correct operation of photographic apparatus or parts thereof
- G03B43/02—Testing shutters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
Im Patent 922 _156 ist eine Schaltungsanordnung zur wählweisen, Messung der Basiszeit und der Mittelwertszeit elektrischer Impulse beliebiger Form, insbesondere zur Messung der Totalzeit-und' der Äquävalenzzeit fotografischer Verschlüsse, be- schrieben-. Hauptsäehdieh in der Kameraindustrie besteht der Wunsch, als Meßwert außer der fotografisch wichtigen Äquivalenzzeit .an Stelle der Totalzeit ihr reziprokes Verhältnis zur Äquivalenzzeit, den sogenannten Durchlaßgrad des Verschlusses zu. erhalten. Hierzu war bisher eine nachträgliche Division beider Meßwerte notwendig, die bei. laufenden Serienmesisungen zeitraubend :ist und zu Irrtümern Anlaß gibt. Die vorliegende Erfindung betrifft eine Zusatzeinrichtung zur obigen Schaltungsanordnung, mit der der Dwrchlaßgrad an einer Skala unmittelbar abgelesen werden kann. Sie besteht darin, .daß das in Zeiteinheiten geeichte Anzeigeinstrument des zur Messung der Kondensatorspannung verwendeten Röhrenvo.lltmeters - mit einem veränderlichen Nebenschlußws,derstand versehen :ist, dessen Skala in Verhältniswerten geeicht ist. Zur Bestimmung des Durchlaßgrades wird zunächst .die. Äquivalenzzeit gemessen, danach auf Totalzeit eingeschaltet und der bai dieser Messung erhaltene größere Ausschlag, der nicht erst abgelesen zu werden braucht, durch Veränderung,des Nebenschdußw,iderstandes auf den kleineren Ausschlag der Äquivalenzzeitmessung zurückgeführt, wonach am der Skala des Nebenschlußwiderstam:des der Durchlaßgrad abgelesen werden kann.In Patent 922 _156 is a circuit arrangement for wählweisen, measure the base time and the average time of electrical pulses in any form, in particular for measuring the total time and 'the Äquävalenzzeit photographic closures sawn schrieben-. Mainly in the camera industry there is a desire to use the reciprocal relationship to the equivalence time, the so-called transmittance of the shutter, as a measured value in addition to the photographically important equivalence time instead of the total time. obtain. For this purpose, a subsequent division of the two measured values was previously necessary. ongoing serial lectures are time-consuming: is and gives rise to errors. The present invention relates to an additional device for the above circuit arrangement with which the degree of efficiency can be read off directly on a scale. It consists in the fact that the display instrument of the tube volume meter used to measure the capacitor voltage, which is calibrated in time units, is provided with a variable shunt, the status of which is calibrated in relation to the scale. To determine the degree of transmittance .die. Equivalence time measured, then switched to total time and the larger deflection obtained after this measurement, which does not need to be read first, is traced back to the smaller deflection of the equivalence time measurement by changing the shunt resistance, after which the transmittance can be read on the scale of the shunt resistance can be.
In. Abb. i ist diese Anordnung schematisch daxgestellt. Darin, eist C der Ladekondensator, Tl die als Röhrenvoltmeter wirkende Verstärkerröhre mit dem Kathodenwiderstand R1, J das Anzeigeinstrument, z. B. ein Drehspwlinstrument, und R2 :der in Verhältniswerten geeichte veränderliche Nebenschluß.In. Fig. I shows this arrangement schematically. In it, ice C the charging capacitor, Tl the amplifier tube acting as a tube voltmeter with the Cathode resistance R1, J the display instrument, e.g. B. a rotary instrument, and R2: the variable shunt calibrated in proportions.
Die prinzipiell in der gleichen Weise wirkende Schaltung der Abb. 2 hat den Vorteil, daß die Skalenteilung für die Verhältniswerte vollkommen linear ist. Bezeichnet man mit a den Drehwinkel des Potentiometers R3 .in Bruchteilen vom Gesamtwinkel, - mit q das Verhältnis des Instrumentenstromes bei beliebiger Stellung des Potentiometers R3 zu dem kleinstmöglichen Instrumentenstrom (also am rechten Anschlag) und mit qm., den, bei gegebener Schaltung .größtmöglichen Wert von q (also am linken Anschlag), so ergibt sieh die Beziehung q = i -i- a ' (qmax- i) unter der Voraussetzung, .daß der anodenseitige innere Widerstand der Verstärkerröhre groß ist gegenüber dem Widerstand der Stromverzweigungsschaltung zwischen dem Schleifer des Potentiometers und dem Zuführungspunkt der Spe:isespann:ung U. Diese Forderung mwß ebenso wie in der Schaltung (Abb. i) auch aus dem Grunde erfüllt sein., damit Änderungen. des Innenwiderstandes der Verstärkernöhre V keinen Einfluß auf die Skaleneichung für die Verhältniswerte haben.The circuit of Fig. 2, which in principle operates in the same way, has the advantage that the scale division for the ratio values is completely linear. A denotes the angle of rotation of the potentiometer R3 in fractions of the total angle, - with q the ratio of the instrument current with any position of the potentiometer R3 to the smallest possible instrument current (i.e. at the right stop) and with qm., The largest possible with a given circuit The value of q (i.e. at the left stop) gives the relationship q = i-i- a ' (qmax-i) under the assumption that the internal resistance of the amplifier tube on the anode side is high compared to the resistance of the current branching circuit between the wiper of the potentiometer and the supply point of the supply voltage U. As in the circuit (Fig. i), this requirement must be met for the reason that changes. of the internal resistance of the amplifier tube V have no influence on the scale calibration for the ratio values.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEC3008A DE932119C (en) | 1950-10-03 | 1950-10-03 | Circuit arrangement for measuring the ratio of mean value time to base time of individual electrical impulses of any shape, in particular for measuring the degree of transmission of photographic shutters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEC3008A DE932119C (en) | 1950-10-03 | 1950-10-03 | Circuit arrangement for measuring the ratio of mean value time to base time of individual electrical impulses of any shape, in particular for measuring the degree of transmission of photographic shutters |
Publications (1)
Publication Number | Publication Date |
---|---|
DE932119C true DE932119C (en) | 1955-08-25 |
Family
ID=7012996
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEC3008A Expired DE932119C (en) | 1950-10-03 | 1950-10-03 | Circuit arrangement for measuring the ratio of mean value time to base time of individual electrical impulses of any shape, in particular for measuring the degree of transmission of photographic shutters |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE932119C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1018545B (en) * | 1955-07-08 | 1957-10-31 | Licentia Gmbh | Arrangement for measuring a DC voltage generated on a capacitor by charging and discharging, in particular for short-term measurement |
-
1950
- 1950-10-03 DE DEC3008A patent/DE932119C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1018545B (en) * | 1955-07-08 | 1957-10-31 | Licentia Gmbh | Arrangement for measuring a DC voltage generated on a capacitor by charging and discharging, in particular for short-term measurement |
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