SU881881A1 - Four-terminal low-resistance resistor - Google Patents

Description

(54) FOUR-LOWER LOW RESISTOR

one

The invention relates to electrical measuring technology and can be used in the manufacture of four-terminal low-resistance resistors for use in AC circuits.

A four-clamp resistor (with a nominal resistance value of 1 ohm and below) is known, having current leads and potential taps, the active part is provided in the form of a bi-filmed plate with an insulating gasket. A decrease in the reactive component of the resistor is achieved by reducing the influence of the surface effect by creating slots in its active part t1.

The disadvantage of the known resistor is the effect of the magnitude of the EMF of mutual induction between the current and potential j, as well as the effect of the surface effect in the current leads on the magnitude of the reactive component of the impedance.

The closest in technical essence is a bifillary four-clamp LOW-RESISTANT resistor, containing an active part in the form of two identical halves of a bifilternally folded plate made of electrically conductive material with slots dividing this shshastin into separate resistance elements, positioned perpendicular bend lines and connected to current lead parallel, in which the reduction of the reactive component is achieved by reducing the effect of the emf value of mutual induction between the current and potential circuits when the location corresponding potential taps, and also due to the effect of surface efekta e in the current lead by providing two slits therein.

The disadvantage of this resistor design is that the residual

Claims (2)

The reactive component, due to the geometry of its active part, remains unchanged, which reduces the 38 upper limit of the frequency range of applicability. In addition, the disadvantage of this resistor is the complexity of the fitting process: a coarse adjustment to the nominal value is done by choosing the location of the soldering of potential taps, and the exact one by spribing the surface of the resistor. The purpose of the invention is to reduce the reactive component while simplifying the fitting process. The goal is achieved by the fact that a four-terminal low-impedance resistor containing an active part made in the form of a bifillary plate of electrically conductive material and current supply is equipped with a flat resistor located on the surface of the current supply and connected in parallel to the part. FIG. 1 shows a low-resistance four-clamp resistor; in fig. 2 its equivalent circuit. The low-resistance four-clamping resist contains current leads 1, the active part 2, made in the form of two identical halves: a bifillary folded plate made of electrically conductive material (for example, manganin), potential taps 3. Between the plates is placed on an insulating gasket 4, eliminating the possibility of short-circuiting halves of the plate. The main resistor further comprises a flat resistor 5, for example, a printing resistor, which is placed on the surface of the current supply 1. Input 6 and output 7 of resistor 5 are connected to the connection points of potential taps 3, i.e. resistor 5 is connected in parallel with the active part 2 of the main resistor. Reduction of the reactive component of the resistor is achieved by changing the location of the flat resistor 5 relative to the flat current lead 1, which leads to a change in the mutual inductance M between the current lead 1 of the main resistor and the flat resistor 5, i.e. to reduce the reactive component of the entire resistor as a whole. Consideration of the equivalent resistor circuit (Fig. 2) shows that we can neglect the capacitive coupling between the bifillary planes of the active part of the main resistor 2, between the flat resistor 5 and the current leads I. The placement of the flat resistor 5 on the plane of the current leads I and turning it on in parallel the active part 2 1 of the BASIC resistor leads to the following change in the parameters of the main resistor: the resistance and self-inductance of a four-clamp low-resistance resistor equipped with a flat resistor 5; R ,, L, resistance and inductance of the active part 2 of the main resistor; resistance and self-inductance of the flat resistor 5; mutual inductance between the flat resistor 5 and the current leads 1; self-inductance of current leads 1 of the main resistor. The reduction of the reactive component of the resistor is carried out as follows. A flat resistor 5 is superimposed on the surface of the current leads 1 of the main resistor. The terminals 6 and 7 of the resistor 5 are connected to the connection points of the potential taps 3. By changing the position of the resistor 5 with respect to the plane of the current leads 1, the mutual inductance changes. With the appropriate choice of values L, 1-2. and M achieve the required intrinsic inductance LH of the entire resistor as a whole. The fitting of low impedance four-clamping AC resistors to ohmic resistance and the reactive component of the impedance is performed as follows. First of all, a coarse adjustment of the ohmic resistance of low-resistance four-clamping resistors is performed. Due to their design, fitting is carried out by moving the point of connection of potential taps 3 to the active part of the main resistor 2. Next, the reactive component (time constant) of the main resistor is not determined without additional switching on the current circuit a flat (printed) rheistor 5. Then, input 6 and output 7 of a flat resistor 5, the resistance value of which is determined from The ratios for parallel connection of two resistors with a known value of the shunt resistor and the required accuracy of reproducing the total resistance of the resistor as a whole are electrically connected to the connection points of potential taps 3 to the surface of the main resistor, thereby more precisely fitting the ohmic resistor. As a flat resistor 5 can be used several printed or film resistors. Next to the surface of the current leads of the main resistor, i.e. outside the active part 2, a flat resistor 5 is applied with a resistive pattern down to the surface of the main resistor, which leads to a decrease in the reactive component of the total resistance of the resistor as a whole. Depending on the inductance value of the active part of the main resistor, the flat resistor (or a group of them) may be partially located on the surface of the 8 16 active part in order to avoid overcompensation. Thus, the fit is reactive. and the active components of the impedance of the resistor is carried out by the same element in stages, and the technological operations of the last stage do not affect the result of the previous one. Claims A four-clamp low-impedance resistor containing an active part made in the form of a bifillary plate made of electrically conductive material and a current lead, is characterized by the fact that, in order to reduce the reactive component while simplifying the fitting process, it is equipped with a flat resistor located on the surface conductor and turned on. parallel to the active part. Sources of information taken into account in the examination 1. US Patent No. 3719914, cl. H 01 C 3/00. 2. USSR author's certificate number 266801, cl. H 01 C 3/02, .prototesh). Ik.