DEP0004265BA - Direct current measuring circuit for sensitive moving coil galvanometers - Google Patents

Description

!.galvanometer.

let "known bonded thereto that d © r äuse <gr © closure © -. not resist a certain value significantly ubgr- Qd © r unteaÄch3 @itet Compliance with such .Bedingung f-rre © maybe you sogan the _e aperiodic Gr @ nssu.stand, at which, because the galvanometer adjusts itself to the ®ida, u <5stop., without any cri © ch © n or around the same damped vibrations , so let namüicto. di © damping of the coil «ysteins» = © ■ goring »the © ee _? before # ® © a © bath« reaches position »executes the same oscillations, however, the external limit resistance is lower en, ®o the attenuation is too great, and the division of the galvanometer «· takes place cri © ch @ na _e Depending on the degree © of the deviation from the limit resistance, a longer or longer time elapses» until the! © .id position is reached, and

0 «? If variable quantities are involved, which are to be measured with the galvanometer, then these often have their value have already changed even before the “oscillating or creeping galvanometer has reached that Snd“ division ”, the d @ m Änfang0batra, g dee Impultes would correspond, the-ton precise measurement is then not possible at all.

Meanwhile, in the event that: the resistance dos me «<? ~ Object dsn external Grena resistance substantially above

steps, thereby (»if au oh under the appropriate Elnbu« s @ to accuracy »-) can help / you can estimate the end stop of the Galvanometer® from the two (asymmetrical) amplitudes of a full oscillation, the deflection is with creeping division, ie if the outer border resistance is not reached, less chatting away, j © further one moves away from the outer boundary,

ate of the invention may, however, the completely m &&

aperiodic setting of a rotating pulse galvanometer in the case of equal tone measurements, despite the fact that the external limit resistance of the measuring object is largely undershot, because the measuring object is carried out in series with the gslvanomster ^ inen · perciodii ^ c ¹ ·! 'ar "b @ it © n · - dgn interrupter τοη beiepieleweie · © 50 It switches on the galvanometer to the®-s" fei ^ s a ζ hacked so. Same trcfc b © zw, © ine

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asrhackta leads to direct voltage, j If you think of the GaI-vanomgter short-circuited via the breaker contact, then ss is completely damped. On the other hand, will the breaker contacts © g © «open? The Galvanometer pal © strives to »guide vibrations to their respective end positions. If, however, the contacts are closed and opened with rushing Frecxaena, then one forms between spaces. liull and infinitely lying- "mean value ¹¹ / the Därapfuns, dtr eueeohliesslioh. depends on the ratio of ßlieeeungaau 0-3ffrj. duration of the contelcte inneAisXb a period * Dices' ratio can in turn with the well-known coats svischen ITuIl \ mC . Infinitely belisbi.3 has been set, -s-ocLass it ε-uf the ^ e way in all prs-ktiech occurring pills Srlingt, a completely aperiodic dien Sob ^ ixyzüv ^ ßzv ^ tBnd., That Maxteurs can be expanded

sensitivity. or the choice? te response time of the galvanometer to φ raw in s en.

So baiepielsweiee on © inem moving coil mirror

g & lvanometer »at '? sen external Granzv / ideriitaiid" with a coil resistance said of 11 ohms at calibrated 2.5 ohms and that in connection with a given / depositing device 5 nV s 5 χ IQ * "V $ @ scales» tail can be read off * in the event of a connection to a voltage source with an internal resistance of only 0.1 obm mid-ls 50-period interruption deflections of 4 nV per division in ap / riodi ech @ n & ^^ te # m # sf-a ^ tsnd clearly measured on a side of only 3 to 4 seconds, without an interruption the Einetell2; was still höHare Spannung®empfindlichkeit of viruses i ge r than 1 nV per scale part practically umeowenlger exploit Vsäre, ale, "not ο small Meee large en over longer time © jsu remain constant p | l" gen _e

The example thus shows that, despite the interruption of the equestrian experience, which is associated with an extensive reduction in the average performance, even if the average power falls below the limit 25 times. measure the same and so "even more about" greater sensitivity "can be used as e'e ohn® interruption in compliance with the äueeeren Greaazv / iderstendee exists,

The prerequisite for the method according to the invention is, of course, the use of interrupter that works without interference, animals contact ©, in particular, must not develop any thermal forces. If AC-controlled relays have to be used

this must be such * that no alternating voltages are induced in the vibrating tongue »which, rectified by it *, are superimposed on the direct current to be measured and the Mts _

thus were falsified. The safest ¥ ierd @ this Premdeinflüe u p mechanically driven by the use fflSÄlXÄ ^^ X Unttr ". Avoid breakers with pressure contacts, as they have already been suggested zxkK measurement of the smallest alternating currents and voltages medium® d @ a Hrehepulgalvanometer (see ζ _β Β _β Koppelmsnn in ^w m © ktrotechnik ^!! 1948, S ₀ IS and in «ATM ¹ «Z 541-1 v _e Aug ₀ 1949)«

Claims (1)

Claim GIeichetrom-Mess® chaTtlängftSsssbeE ondere for turning * · it is characterized by the fact that the G / lvanO 'meter with the current. » respectively The voltage source is connected via a periodically working breaker.