SU257608A1 - CALIBRATOR DC AND VOLTAGE - Google Patents

Description

The invention relates to constant voltage calibrators and can be applied to measuring equipment and instrument engineering for the calibration of electrical measuring instruments.

The known DC voltage and voltage calibrators with a device controlling the voltage of the reference voltage, the reference voltage source, the DC amplifier and the decade of resistors, allow the reference voltage to be divided into any variable number of parts. However, a change in the number of parts into which the reference voltage is divided is produced by means of a multi-range precision shunt with a switch.

The values of shunt resistances must be known in advance, which limits their area of application: and. When striving to create a universal calibrator that provides verification of various instruments, including instruments with external shunts and with suppressed zero, the scheme becomes much more complicated.

To simplify the design, the proposed calibrator device, which controls the driving voltage change, is made in the form of a compensating voltage regulator, which has two decades of resistors, the resistances of which are single and ten, with two independent brushes each, and one pair of brushes, one from each decade, is connected in series with the source voltage on the input of the DC amplifier, and the other pair of brushes in is output by the device.

The drawing shows the principal

0 wiring diagram of the proposed device.

The device contains a source 1 of a stable and known supported voltage UQ, an amplifier 2 of direct current with a large transfer coefficient, a decade of 3 precision resistors consisting of ten equal resistances h, a decade 4, prepositional resistors JO value, each.

0

Each resistor of decades 3 and 4 is connected to two sets of contacts along which brushes 5, 6 and 7, 8 move. The initial zero position of the brushes is point 9.

five

In accordance with the principle of operation of the kompsepation stabilizers, equality is ensured automatically up to the error of noncompensation.

where f / 5-e is “apr woman between brushes 5 and 6.

While Uo I g- N,

where L / is the number of ipeawcTOpOB included

between brushes 5 and b; / - part of the current output of the amplifier flowing through decades 4 and 3. Then the voltage LJ between brushes 8 and 7 will be

f / ,. t,

where i is the number of resistors r connected between brushes 7 and 8.

f / o.

(/ i /. G - i

In this way, setting bridle 5 and (5 to the position corresponding to any number L, "a, which needs to be divided or placed f / o, depending on the position of the brushes iS and 7, receive" match U, equal to any number of parts from UQ .

Subject invention

Voltage and current calibrator With a device controlling the stui- nance,

pgm (on-line voltage change, containing a voltage source, a DC amplifier and two decades of resistors, characterized in that, in order to simplify the design, a device that controls a step change in the reference voltage is made in the form of a compensatory stabilizer voltage, in which two decades of resistors, the resistances of which correspond to units and tens, with two independent brushes, can be turned on, each with one independent pair of brushes, one for each zhdoy decades, is connected in series with a source of reference voltage to the input

the DC amplifier and the other of the brushes is the output of the device.