SU746363A1 - Apparatus for calibrating high-voltage precision voltage divider - Google Patents

Description

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The invention relates to electrical measuring technology and can be: used in the calibration of high-voltage precision dividers of the pressure sensor.

A self-verifiable voltage divider is known, the calibration of which is carried out at a low voltage of 1.IQ

The disadvantage of such a calibration is that it is not carried out under operating conditions, in particular, not under operating voltage, as a result of which the accuracy is reduced.

The closest technical solution to the invention is a device for calibrating a HIGH-VOLTNEYS precision voltage divider, containing an additional high-voltage resistive voltage divider connected in parallel to the precision-divider input made up of a mi-ten-day low-voltage precision divider, which is a theme for the adult. With which included a db resistor and a null indicator 12.

The disadvantage of this device is its complexity, determined by a multi-decade precision divider voltage.

The aim of the invention is to simplify the device.

This goal is achieved by the fact that in a device for calibration, a high-voltage precision voltage divider is 1 × 5. of series-connected high-voltage, intermediate and low-voltage resistors, containing a shunt switch connected in parallel to the intermediate resistor, an additional high-voltage resistive divider connected in parallel to the input of a precision divider, composed of a low-voltage precision decadal voltage divider, in series with which an additional p-divider connected in series with which is included in a low-voltage precision decadal voltage divider connected in series with an additional p-divan voltage divider connected in series with a divider, connected to the high-voltage resistor; and the indicator, the decade precision divider, is made one-step, and the indicator is made as a two-way compensator direct current, the input of the first row of which is connected in parallel with the low-voltage resistor, and the input of the second row of output - to the output of a single-stage precision single-cell voltage.

The drawing shows the electrical circuit of the device.

The device contains a two-circuit compensator 1 of alternating current with the input of the first pk 2, 3 and the input of the second. 3, 4, high-voltage precision voltage divider 5, comprised of high-voltage resistor b, intermediate resistor 7 and low-voltage resistor 8, shunt switch 9, terminal 10, additional high-voltage resistive divider 11, made of a single-step precision divider on resistors 12 and 13 with pins 14 and 15 and output Kc) ntakt6m 1b, additional resistor 17 of low accuracy, trimming resistor 18, terminal 19., The device works as follows .. With the shunt switch 9 open, the voltage ode 2, 3 pervog th row canceller 1 will be equal to: RS (1) is, where, and - the voltage at the input;. .2, 3 of the first row of compensator 1 and is the operating voltage of the high voltage power supply: precision divider 5 voltage R RJ Rj, - respectively, the resistance values of the resistors 6, 7 and 8.,. -. .:. At the same time, the voltage at the input 3, 4 of the brighter racator 1 when the contact 14 of the single-stage precision divider II is connected to the output contact 16 is:., (2) the voltage at the output of the second row of the DC compensator; respectively, the values of the resistivity of the resistor 12, 13 and 17.. . -V tg.-fi..v., J ---- .. vr -: CIiatyo: “i yfda.a -, g: .l; (1) And (2) we get: From the formulas B,, --VV 8 f) .V, f where P, v5: The value of the resistor R, g is chosen so that the counts U and - and are close in value. In this case, the error of the compensator is eliminated by the error of determining p. When the shuntyroye P 9 is closed and the contact 15 of the preclinter divider 11 is connected to the output pin 16, we obtain the following equation: T where Yag

Claims (2)

746363 voltage input 2, 3 of the first p of the compensator 1; the voltage at the input 3, 4 of the second row of the compensator. At a selected ratio of 0.1 R, voltage) h and U will be close in value, it is necessary to exclude the loss of the commutator when determining p,. Relationship can be determined with high accuracy at low voltage. Then from formulas (3), (4) and (5) we get: where K is the division factor of the high-voltage precision voltage divider 5.. Thus, this solution simplifies a device for calibrating a high voltage precision voltage divider. Apparatus of the Invention A device for calibrating a high voltage precision voltage divider composed of series-wise high voltage, intermediate and low voltage resistors, containing a shunt switch connected, parallel to the intermediate relay, an extra high voltage resistive divider connected in parallel to the space divi- low-voltage precision decade voltage divider, in series with which an additional is inserted; a new regriclop, and an indicator, about aphids ,; And in order to simplify the device, the decade precision divider is made single-stage, and the indicator is in the form of a two-bit DC compensator, the first row of which is connected in parallel to the low-voltage resistor, and the second row input - to a single-stage precision voltage divider. Sources of information taken into account in the examination 1. Collector Microwire and devices of resistance, Map Moldovian ske., 1967, no. 5, s. 162-173. 2. Journal of Scientific Instruments, 1965, No. 4, p. 123, fi 1. 746363