SE124231C1

SE124231C1 -

Info

Publication number: SE124231C1
Authority: SE
Publication date: 1949-01-01

Description

Uppfinnare: A. Jacobs. Inventor: A. Jacobs.

Prioritet begtird frdn den 5 mars 1946 (Nederldnderna). Priority was given on 5 March 1946 (Nederldnderna).

Foreliggande uppfinning hanfor sig till en kopplingsanordning fdr synliggorande ay likspanningar med eventuellt langsamt loranderlig storlek pa skarmen till en katodstraleoscillograf. The present invention relates to a coupling device for illuminating DC voltages of possibly slowly varying size on the screen of a cathode ray oscillograph.

Vid en kand kopplingsanordning for synlic,igorande av likspanningar anvandes en elektronomkopplare med -Eva kanaler, som vaxelxis farbindas med samma plattsats i oscillografen. Likspanningen tillfores till den ena kanalen, och den andra kanalen är kortsluten. Elektronomkopplaren avgiver en blockspanfling, vars amplitud hr ett mhtt ph likspdnningens storlek. Den takt, med vilken elektronomkopplaren vaxelvis forbinder kanaterna med oscillografen, kan utan betankligheter valjas tamligen hog, 1. ex. 800 p/s. Blockspanningen innehaller vaxelspanningskomponeater, vilkas lagsta frekvens, grundfrekvensen, uppgar till 800 p/s. Oscillografen med den tillordnade fOrstarkaren kan utan distorsion atergiva sadana vaxelspanningar. Vid na.- gorlunda hastiga andringar av likspanningens storlek upptrada emellertid i den beskrivna kopplingsanordningen inkopplingsforeteelser, som forsyara avlasningen ay den pa skarinen synliga bilden. In a well-known coupling device for the visualization of direct voltages, an electron switch with -Eva channels is used, which is connected to the same plate set in the oscillograph. The DC voltage is applied to one channel, and the other channel is short-circuited. The electron switch emits a block voltage, the amplitude of which is equal to the magnitude of the DC voltage. The rate at which the electron switch alternately connects the channels with the oscillograph can be chosen without hesitation rather high, 1. ex. 800 p / s. The block voltage contains alternating voltage component, whose lowest frequency, the fundamental frequency, amounts to 800 p / s. The oscillograph with the assigned amplifier can reproduce such alternating voltages without distortion. However, in the case of fairly rapid changes in the magnitude of the direct voltage, coupling phenomena occur in the described coupling device, which provide the reading with the image visible on the screen.

Foreliggande uppfinning liar till andainal att astadkomma en kopplingsanordning, vid -yilken namnda nackdel är undanrojd. It is an object of the present invention to provide a coupling device in which the said disadvantage is eliminated.

Enligt uppfinningen tillfores en del ay elektronomkopplarens utgangsspanning otter iikriktning och utjamning till den andra, i drift joke befintliga kanalen med en polaritet, som är motsatt polariteten av likspanningen i den fOrsta kanalen. According to the invention, a part of the output voltage of the electron switch is applied towards rectification and equalization to the second, in operation joke existing channel with a polarity which is opposite to the polarity of the direct voltage in the first channel.

Sasom narmare framgar av fdljande heskrivning, underlattas gunorn uppfinningen den riktiga tydningen av den pa skarmen synliga bilden vasentligt till foljd av franyaron av stOrande inkopplingsforeteelser. As will be more apparent from the following description, the invention is omitted from the invention to give the correct interpretation of the image visible on the screen substantially as a result of the occurrence of major connection phenomena.

Uppfinningen shall nu fOrklaras nal-mare med hanvisning till bifogade ritning. Fig. 1 visar den ovan namnda kopplingsanordningen ay kant slag. Fig. 2 visar ,ett diagram, med vars tillhjd.lp verkningssattet av kopplingsanordningen enligt fig. 1 fOrklaras narmare. Fig. 3 och 4 visa den bild, som under vissa förhâl- landen blir synlig pa skarmen till katodstraleoseillografen enligt fig. 1. Fig. 5 visar kopplingsanordningen enligt uppfinningen. The invention will now be explained in more detail with reference to the accompanying drawing. Fig. 1 shows the above-mentioned coupling device in edge stroke. Fig. 2 shows a diagram, with the aid of which the mode of operation of the coupling device according to Fig. 1 is explained in more detail. Figs. 3 and 4 show the image which, under certain conditions, becomes visible on the screen of the cathode ray trellisillograph according to Fig. 1. Fig. 5 shows the coupling device according to the invention.

I fig. 1 har elektronornkopplaren 1 tva ha- naler 2 och 3, som vaxelvis forbindas med katodstraleoscillografen 4 i en takt ay 800 ggr per sek. Den likspanning, som skall goras synlig, Whores till kanalen 2, under det att. kanalen 3 är kortsluten. I fig. 2 ar sponningen V uppritad som funktion av tiden t. Med 10 betecknas likspanningen i kanalen 2, och med 11 betecknas elektronomkopplarens utgangsspanning, som tillfores till oscillografen 4. Amplituden av denna utgangsspanning är liar for enkelhetens skull visad av samma storlek som likspanningen 10. I allmanhet kommer elektfonomkopplaren 1 dven att forstarka spdnningarna, sa att amplituden av blockspanningen 11 da är storre On amplituden ax likspanningen 10. In Fig. 1, the electron coupler 1 has two channels 2 and 3, which are alternately connected to the cathode ray oscillograph 4 at a rate of 800 times per second. The DC voltage, to be made visible, Whores to channel 2, while. channel 3 is short-circuited. In Fig. 2, the voltage V is plotted as a function of the time t. 10. In general, the electron switch 1 will also amplify the voltages, so that the amplitude of the block voltage 11 da is larger On the amplitude ax DC voltage 10.

I fig. 3 visas den ph katoristraleoscillwrafen 4 uppstaende bilden, som bestar ay.'tva. parallella linjer 15 och 16. Aystandet Indian dessa bada linjer är ,ett matt pa storlekcn av den till kanalen 2 tillforda likspanningen. Fig. 3 shows the rising image of the ph katoristraleoscillwraph 4, which consists of two. parallel lines 15 and 16. Aystandet Indian these two lines are, a measure of the magnitude of the DC voltage applied to channel 2.

Linjerna 15 och 16 ligga symmetriskt i forhallande till nollinjen 17, soul blir synlig nar nagon spanning joke tillfores till kanalen 2. Detta symmetrildge astadkommes genom installning av RC-kopplingarna mellan tillf aringsledningarna och plattorna i kaiodstraleoscillograf en 4. Lines 15 and 16 are symmetrical in relation to the zero line 17, soul becomes visible when a voltage joke is applied to channel 2. This symmetrildge is achieved by installing the RC connections between the supply lines and the plates in kaiodstrale oscillograph a 4.

I allmanhet kommer en ay ledningarna i kanalen 2 och likaledes en ay tillforingsledningarna till elektronstraleoscillografen 4 att vara jordad. Till foljd ay forefintligheten ay de namnda kopplingselementen Or trots delta den pd skarmen synliga bilden symmetrisk i forhallande till nollinjen 17 pa grund ay laddningen pa kondensatorerna i kopplingselementen. Tilltager nu platsligt likspanningen i kanalen 2 med ett bestamt varde, sa kommer en 2— — av de hada linjerna 15 och 16 att plotsligt dndra laze. Den dá synliga bilden angives i fig. 4 av linjerna 20 och 21. Linjen 21 ir icke forskjuten i forhallande till linjen 16, da linjen 21 inotsvarar spanningen i den kortslutna kanalen 3, och endast spdnningen i den andra kanalen 2 är andrad, varmed den forskjutna linj en 20 overensstammer. Hdrigenom har emellertid skdrmbildens Idge blivit osymmetriskt, medan det till folj d av den kapacitiva kopplingen mellan 1 och 4 skall slutgiltigt installa sig symmetriskt. Den for uppnhende av ett symmetrilage has bilden i forhallande till nollinjen. 18 erforderliga tidrymden betingas av RC-tiden for de i oscillografen forefintliga kopplingarna. Denna tid dr i allmanhet relativt Fang, (la oscillograf en aven maste vara anvandbar for mycket laga frekvenser av t. ex. 10 p/s. Foljaktligen flyttas linjerna 20 och 21 langsamt till det symmetriska laget 22, 23. Under denna installningsforeteelse dr det svart att konstatera, om likspanningen 2 flirblir kon.stant, enfir det for delta andamal maste undersokas, om avstandet mellan de bada rorliga linj erna fOrblir konstant eller icke. In general, one of the lines in the channel 2 and likewise one of the supply lines of the electron beam oscillograph 4 will be grounded. As a result of the presence of the said coupling elements Or despite participating the image visible on the screen symmetrically in relation to the zero line 17 due to the charge on the capacitors in the coupling elements. If the direct voltage in channel 2 now increases locally by a certain value, then a 2— - of the had lines 15 and 16 will suddenly change laze. The visible image then is indicated in Fig. 4 by lines 20 and 21. Line 21 is not offset in relation to line 16, as line 21 corresponds to the voltage in the short-circuited channel 3, and only the voltage in the second channel 2 is different, whereby it offset line a 20 matches. As a result, however, the Idge of the shield image has become asymmetrical, while due to the capacitive coupling between 1 and 4 it must finally be symmetrical. It for the attainment of a symmetry layer has the image in relation to the zero line. The required time space is determined by the RC time of the connections present in the oscillograph. This time is generally relative to Fang, (let the oscillograph also have to be usable for very low frequencies of eg 10 p / s. Consequently, the lines 20 and 21 are slowly moved to the symmetrical layer 22, 23. During this installation event, the It is difficult to ascertain whether the direct voltage 2 remains constant, but it must be examined for delta andamal whether the distance between the two moving lines remains constant or not.

I fig. 5 visas kopplingsanordningen enligt uppfinningen, genom vilken den ovanntininda nackdelen undarojes. De mot fig. 1 svarande delarna dro betecknade med samma hanvisningssiffror. En del av utgan.gsspanningen fran elektronomkopplaren uttages i detta fall fran potentiometern 30. Denna spanning likriktas av likriktaren 31 och utjamnas av kondensatorn 32. Den sâ erhallna likspanningen tillfores till kanalen 3 pa sd sat, att polariteten dr motriktad mot polariteten av fipiinningen i kanalen 2. Genom riktig installning air poteritiometern 30 eller genom den i de fiesta fall i elektronomkopplaren anordnade spdnningsregleringen for de hada kanalerna 2 och 3 kan astadkommas, att spanningarna i de bada kanalerna 2 och 3 bliva lika. Elektronomkopplarens utgangsspanning är vaxelvis negativ och positiv och alltsa symmetrisk i forhallande till tillforingsledningarna. Pd detta sd.tt erhalles automatiskt ett symmetrilage air bildlinjerna 15 och 16 pa katodstraleoscillografens skarm i forliallande till nolllinjen 17. Vid en plotslig andring i likspanningens storlek behover man alltsd icke avvakta forloppet av inkopplingsforeteelsen i oscillografens kopplingselement. Visserligen upptrader en inkopplingsforeteelse i filtret 30, 31, 32, men dess RC-tid behover endast valj as stor i forhallande till elektronomkopplarens omkopplingsfrekvens. Vid plotsliga spanningsandringar i kanalen 2 intaga foljaktligen linjerna 15 och 16 nastan ogonblickligen sitt slutlage, d. v. s. det i forhallande till nollinjen symmetriska laget. Fig. 5 shows the coupling device according to the invention, by which the above-mentioned disadvantage is obviated. The parts corresponding to Fig. 1 were denoted by the same male reference numerals. A part of the output voltage from the electron switch is in this case taken from the potentiometer 30. This voltage is rectified by the rectifier 31 and equalized by the capacitor 32. The DC voltage thus obtained is applied to the channel 3 in such a way that the polarity is opposite to the polarity 2. By correct installation of the air potentiometer 30 or by the voltage control for the hot channels 2 and 3 arranged in most cases in the electron switch, it can be ensured that the voltages in the two channels 2 and 3 become equal. The output voltage of the electron switch is alternately negative and positive and thus symmetrical in relation to the supply lines. In this way, a symmetry layer of the image lines 15 and 16 on the screen of the cathode ray oscillograph is automatically obtained in relation to the zero line 17. In the event of a sudden change in the magnitude of the direct voltage, it is not necessary to wait for the connection phenomenon in the oscillograph coupling element. Admittedly, a switch-on phenomenon occurs in the filter 30, 31, 32, but its RC time only needs to be selected as large in relation to the switching frequency of the electron switch. In the event of sudden voltage changes in the channel 2, the lines 15 and 16 consequently almost immediately assume their final position, i.e. the layer symmetrical in relation to the zero line.

Claims

Patent claim: Coupling device for making DC voltages visible with any slowly changing size of the screen. to a cathode ray oscillograph by means of an electron coupler with two channels, which are alternately connected to the same plate set in the oscillograph, a line drawn, that the output terminals of the electron coupler are connected to a voltage divider with a rectifier, and that the other operating non-existent channel, in such a way that the polarity of the direct voltage in the denim seuare channel Or opposite the polarity of the direct voltage in that supply channel. Stockholm 1949. Kung, l. Boktr. P. A. Noratedt & Boner 490089