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 shutters

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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
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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
Application number
DEC3008A
Other languages
German (de)
Inventor
Gerhard Clamann
Werner Grahnert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DEC3008A priority Critical patent/DE932119C/en
Application granted granted Critical
Publication of DE932119C publication Critical patent/DE932119C/en
Expired legal-status Critical Current

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Classifications

    • GPHYSICS
    • G04HOROLOGY
    • G04FTIME-INTERVAL MEASURING
    • G04F10/00Apparatus for measuring unknown time intervals by electric means
    • G04F10/10Apparatus for measuring unknown time intervals by electric means by measuring electric or magnetic quantities changing in proportion to time
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B43/00Testing correct operation of photographic apparatus or parts thereof
    • G03B43/02Testing shutters

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  • 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)

PATENTANSPRÜCHE: i. Schaltungsanordnung zur Bestimmung des Verhältnisses von Mittelwertszeit und Basiszeit einzelner elektrischer Impulse beliebiger Form, insbesondere zur Bestimmung des Durchdaßgrades vom fotografischen Verschlüssen, ,unter Verwendung einer Schaltungsanordnung nach Patent 92z 156, wobei .die Spannung des Ladekondensators mit einem Röhrenvoltmeter gemessen wird,, dadurch gekennzeichnet, daß das Anzeigeinstrument (J) des Röhrenvoltmeters mit einem veränderlichen Nebenschluß.-wider!stand (R2) versehen ist, dessen Skala in Verhültniswer.ten geeicht ist. PATENT CLAIMS: i. Circuit arrangement for determining the ratio of mean value time and base time of individual electrical impulses of any shape, in particular to determine the degree of penetration of photographic shutters, , using a circuit arrangement according to patent 92z 156, where .the voltage of the charging capacitor is measured with a tube voltmeter, characterized by that the display instrument (J) of the tube voltmeter was with a variable shunt-resistance! (R2), the scale of which is calibrated in ratio values. 2. Schaltun.gs,anordnung nach. Anspruch i, dadurch gekennzeichnet, daß im Anodenkreis des Röhrenvoltmeters eine Ringschaltung aus Anzeigeinstrument (J), einem festen Widerstand (R2) und einem Potentiometer (R3) angeordnet ist, wobei der Anodenstrom am Verbindungspunkt zwischen Instrument und festem Widerstand zugeführt und am Schleifer des Potentiometers abgenommen wird oder umgekehrt. 2. Circuit arrangement after. Claim i, characterized in that in the anode circuit of the tube voltmeter a ring circuit made up of a display instrument (J), a fixed resistor (R2) and a Potentiometer (R3) is arranged, the anode current at the connection point between Instrument and fixed resistance supplied and removed from the potentiometer wiper will or vice versa. 3. Schaltungsano:rdnun,g nach Anspruch i und 2, daduirch gekennzeichnet, daß der Widerstand der Stromverzweigungsschaltung kleiner ist als der wirksame anodenseitige Innenwiderstand der Verstärkerröhre des Röhrenvoltmeters.3. Schaltungsano: rdnun, g according to claim i and 2, daduirch characterized, that the resistance of the current branching circuit is smaller than the effective anode-side Internal resistance of the tube voltmeter's amplifier tube.
DEC3008A 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 Expired DE932119C (en)

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

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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

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DE (1) DE932119C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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