DE1876096U - DC AND AC MULTIPLE MEASURING INSTRUMENTS WITH A MEASURING RANGE AND A MEASUREMENT TYPE SELECTOR. - Google Patents

Description

^. iji. lit'W mJ 1 Ö * J

\ Lieentia Patent ° ¥ erwaltungs «» GmbH

Frankfurt am Main, 3? Heodor ~ St © rn = »Kai

Schubert / M. L 30 565/21 e

Equal to and alternating currents, multiple shares with a measuring range and a measuring type selector

In the previously known multiple measuring instruments, a common base plate is used to set up the resistors, capacitors, Sehalter and dglo, on which the above components are applied in a suitable manner Current areas provided on this base plate are »The Vorwide» -. stands are generally Schichtwiderstäade low, tolerance _r while lifting resistances _s particular di © higher Strommeßbereiehe _$ special resistances, "This Grimdplatt © is covered by a handy housing" The M © SSW @ r ... lf either on the Base plate or arranged on the housing _o In the case of known instruments, the resistors are fib? di @ higher current measuring ranges than spiral wire resistances i2ad / © d © 3? · than

corrugated sheet metal strip resistor ausgebildetο '

In a known multi-part knife, the type of current selector is designed as a rotary switch, the handle of which is connected to a _{pin 9} which is shifted in a vertical angle when the handle is rotated. » This pin acts on a set of springs § "which is switched accordingly" This design of the current type selector is complicated

The electrical connection of the components of these multiple knives, which are arranged on the base plate, is made by a large number of different knives individual wires o Because of the relatively large number of di®® @ r components © and the small amount of space available on the base plate difficult and time-consuming wiring «

It is also already a multi-faceted knife with a moving iron knife known who does not require a current type selector ° As a base plate © is A so-called printed circuit is provided for this device. The device naturally has no rectifier and only has a measuring range selector to «

The innovation has set itself the task _{9 of} avoiding the disadvantages © of the known multiple knives with a measuring range = and a measuring type selector ο The innovation relates to a DC and AC multiple measuring instrument with a measuring range = and a jfeßart = selector ο The furnace is characterized ₉ that · ά% 3? Structure of the instrument from three plates in printed © ^ Sohaltuagsteelmik Tb © = stands 9 with a main plate di © electrical components; α®τ Spaa = voltage areas of the rectifier circle wheel that carries the heights-ea Str © mbar @ ieh © and is also designed as a printed circuit board for the voltage range © and the current type _{selector 9} währead @ ia @ aadere Platt © as a switching level for di® current range is shown as "ad di © rest = borne life resistances of the current range ^ h ©, where the third © plate is also used as a switching level © for a low - measuring range amsg © · = - and that the visual support planes assigned to the measuring ranges three plates are arranged in a congruent manner, with a spacing one above the other, with the adjustment of the three viewing planes by © ine © insig®

The handle can be operated ο

PB-Hrο thrust 31 269

Suitably, the Stromartwähler is designed as a separate rotary switch = formed and has to adjust ®in © n lever ₉ is with its free end with a fixed to the housing of the instrument ¹ De © ^ is coupled knob = One further embodiment are corresponding to "* resistors for the high current range © designed as meandering metal sheets and arranged on one side of the main plate © sag © = arranged. According to a further design, the measuring mechanism is firmly connected to the housing

The innovation is shown schematically in the drawing using a = * presented exemplary embodiment explained in more detail

Figo 1 shows the electrical _{circuit 9, known} in principle, of the multimeter »R1 to R8 and R14- are the series resistors for the voltage ranges to which switches 1 to 9 are assigned Current = measuring ranges denotes _{9 to} which the sensors 10 to 18 are assigned. The type of current selector is denoted by 21 and "is in the" direct current "position. The current to be measured or voltage is applied to the terminals ° / A or = / ¥ switched with Ji is the moving coil measuring mechanism marked »The ISeSwerk J1 is assigned a fixed ¹ ¥ © rwid © r ° stand 28 and also a triffimer potentiometerE · E29? A with which the measuring mechanism resistance is adjusted ..» This is ice fixed resistor E16 parallelgeschaltato Instead of this'. potentiometers E29 have been in as Sisehgeräten determined -a multiple knives, wire-wound. resistors ¥ erwendet _s di © only in conjunction with the respectively used tracery "ad then had to be wrapped exactly *, the thus & us-amm © nhanging like calculation? Winding and testing are durela di © Vas

65/21 e Good

For AC current measurement in the "^" position. The 21 is a 'from the rectifiersGr1, te> 2 and the resistors R11 R12 existing, see well-known .Brückens © attitude provided JLn @ h here is for the adjustment of the Gleiohrichterwide ^ standee is a potentiometer R1? provided which the previous Ben winding ₉ measuring and testing work for the previously used f © stea _; Special resistor made superfluous

This trimmer potentiometer R29? R17 are set once to a certain value during the calibration of the instrument "m & after completion of the instrument they are no longer correct External intervention in the "ready-to-use instrument accessible".

The resistors R14 _S R1 $ are intended for the lowest equi-voltage or current measuring range jz _o Bo $ 0 mV / 150 μΑ. When switches 9 and 19 are closed, B @ r switch 20 is then and only then open and generally sent to all other areas, while switch 19 is generally open to this B @ r @ icliea.

ίη the Figures 2 to 3 are two individual © plates measured instrument shown

The main plate A "according to FIG. 2 is designed as a gedxuekt® circuit (underside, some printed lines are indicated by dashed lines) and has the printed switch 1 _β ο ο 9 for the · voltage measuring ranges and a further printed switch 21 for the type of current selection ο die The front of the plate bears the © T © rwider =

5 '- JjLJ0_36g / 21e sqm

ESSBTSEB ^ M 269

stands R1 .. »R8 and R14 · for the voltage ranges and the other components for the voltage path, furthermore the trimmer potentioaet © r R17 for the adjustment of the rectifier response. As indicated at H, the power selector 21 is actuated by a slotted lever, with a pin (not shown) engaging in the shaft, which is adjusted by a rotary knob (not shown) located on the housing of the instrument. -, '■ - ^; v ^; ^

The plate A "also carries on a narrow side U meandering formed resistors 26, 27 for the two highest current areas <. These can be produced in a simple manner from manganine sheet These sheets are compared by more or less milling a gap T (Fig. 4). The ends D ₅ E of the resistor are connected to a suitable resistance measuring device Plate A ° arranged in a curved shape <> The resistors 26. _{$ 27 have tabs L 5} for the purpose of fastening which reach through plate A °, whereby the part of the tabs standing ^{over this plate A 1 is bent at right angles »}

, The shape of the resistors 26, 27 results in a large © surface © for Heat radiation «The resistor 26 for the smaller current range

"eats in a meandering shape with smaller dimensions within the he ~ giving arc of the resistor 27 arranged for the largest current range

As Figo 3 shows, the second, smaller plate B is designed as a switch · »ebajne for the Sfcrommeßberelche with the switches 10« - »o 18

L, 50 565 / 21e Gm ta thrust $

forms and carries the rest of the plate A 'in the area of the striehpunktieruni The switches 1 o _OO 9 rad 10 _ooa 18 A% B are shared by a ©

Si® is arranged over the, 2)

The third plate, not shown any further _? the approximately the same © measurements as plate © B has ₉ came between. the plate © A ⁰ to be arranged according to Figo 2 »It has a printed" circuit level for the special area "60 ra ¥ - = / 150 μΑ" with the Switches 19 "20 according to FIG. 1" These are also actuated by the axis C. The representation of the plates A \ B in FIGS. 2, 5 corresponds approximately to their natural size _s

The three plates result in a division of the circuit of the Yielfa knife into three groups «. These plates can thus assembled for a look and be as necessary wired "It gives sieä dadureli a significant rationalization ₀ The finished plates are in ■ Easy-Weise'zusammengebaut wheel over a few Einzeldraht® connected informed each other s that look a funktionsfähig® circuit a Figo 1 gives »

The (primmer potentiometer H29 directly at the measuring unit J1

ier

The shape of the casing of the instrument is correct

Some of the instruments according to the ABG printed publication % 21 from 1958 »This housing contains the measuring device J1 with the trimmer potentiometer K29 arranged on it

intended for the current type selector «.

The three tiered gusaiamengebaut © a plates with their ready'®. Functional circuit are placed in the housing, which is open at the bottom. There are only connections with the terminals. - / produce A / V, and the measuring unit "The frismerp.ot©ati©met@r E29 ₃ R17 are accessible from the lower side of the housing"

Figures 2 and 3 is particularly simple and overlooks Liehe construction of multiple knife to remove _o Compared with known Much .werden "professional knives for any of the components of the plates A \ B be" sondere holder requires = Die® is especially true for the resistors 26, 27 "There are no 'special switch requires ₈ since here · = for also equal the plates A% B Haerange ^ ogen SINCL There are few connections between the boards" make _o' the .AB = equal to the instruments, in the known devices a high time = · - part 9 is made extremely simple by using the! primmer potentiometer look! * »

7 pages description
4 claims for protection

Sheet of drawings with 4 figures

Protection claims;

Claims (1)

50 363 / 21β gm Thrust 31 269 S chat , ζ, a, η,, s _{i i;} ρ r. I ehe α Direct and alternating current multiple measuring instrument with a measuring range »and a measuring type selector and a moving coil mechanism d © m a rectifier arrangement is connected upstream for alternating current measurements, characterized in that the structure of the instrument consists of three plates in printed circuit technology ₉ with a main plate the electrical components the voltage range _{s of} the rectifier circuit and the higher current range © and also designed as a printed circuit level for the voltage range® and for the Stromarttfähler, while a wide plate te is designed as a switching level for the Stroxameßbereiehe ₉ which carries the remaining lifting resistances in the current range, and the third plate is designed as a switching level for a smallest separate DC measuring area, and that the switching levels of the plates assigned to the measuring areas are arranged congruently and at a distance above one another and the setting of the same by a single handle from® operable iat _o 2c multiple knife according to claim 1 ₉ dadureh _s in that constitute Stromartwähler as a rotary switch formed \ ma one at its, free end © slotted lever b @ SITET ₈ being engaged in the slot a pin Instrubefestigten with a d on the housing @ e knob connected is., ο "multi-meter according to claim 1 and 2, _{$ 9} characterized in that the resistors of the high current double preparation formed as meander-shaped sheet and on a narrow side of the main Platt © on" = I> 30 363 / 24e sqm fiÖ drawer $ 1 are ordered o ο Tielfacl knife according to claim. 1 _$ dadiarch indicated that trimmer potentiometers which are not accessible from the outside are provided in the measured values and rectifier circuit for the adjustment of the measuring mechanism and rectifier resistance