SU455298A1 - Method of calibration of high voltage divider - Google Patents

Description

This invention relates to the field of high electrical current measurements. A known method of checking a 1V high voltage divider (VDN) is carried out with the help of a low voltage precision decade voltage of a voltage and a high voltage high stability. However, these two elements are technically and constructively difficult to implement, and the method itself is applicable only to special design divisors, as a result of which this method does not find a wide application. In addition, verification requires a change in the thermal mode of the divider and a large number of measurements, which, in its turn, leads to a decrease in the accuracy of the increase in BipeiMeHH verification. The purpose of the invention is to improve the speed and accuracy of the calibration of the divider. To do this, at a high working voltage, the reference divider circuit includes an exemplary divider with a nominal division factor equal to the division ratio of the switched divider, and a total resistance of one to two times less. Then, a high operating voltage is applied to the circuit and, comparing the total voltage, falling, on the low-ohm shoulders of the dividers, with the voltage of the output of the test divider when the sample divider is shorted, the value of the division ratio of the turnable divider is determined. The invention is explained in the attached diagram. It contains a high-voltage arm ./ of the VDN turned, a low-voltage arm 2 of the tested VDN, a high-voltage input 3 of the turned VDN, a null indicator 4, an output 5 of the low-voltage source, a switch 6, an exemplary low-voltage divider 7 of the pair and a measuring instrument 8. A high operating voltage LJ is applied to input 3. Then the indicator 4 is turned on between the output of the turned VDN and the output 5 of the reference low-voltage source (switch 6 is in position a), the adjustment of which sets zero on the indicator 4. In this case, the equality: v. ) where / С is the division coefficient of the novative VDN; RI and RZ - with: not his 1 nlec. After that, between the shoulders of the VDN include an exemplary low-voltage voltage divider 7, the total resistance jRs of which should be one to two orders of magnitude less than the total resistance of the verified divider, and the division factor p is chosen equal to

the nominal dividing ratio of the rotatable divider / (No. between the output VDN and) output 1 5 of the reference source "switches on the measuring device (switch 6 is set to c). In this case, the equality holds:

2 + rlz

, U ,, (2)

lde - the total resistance of the divisor 7;

p is the division factor of divider 7;

Af / 2 is an indication of p | ri) boron 5. From the solution of equations (1) and (2) it follows that the value of the division factor of the verified divisor

. ,

 + (l +) rJ with / (p.

If the low-voltage divider 7 and -me regulated output, then in the STOipOM case you get a zero indicator reading as well, BUT equation (2) takes the form:

 + P%

, / 2, (2)

where p is the set value of the division factor of divider 7.

From the joint solution of Eqs. (I) and (2), it follows that / (p.

Predmemt and z obreteni

A method for calibrating a high voltage voltage divider based on the method of comparing a calibrated divider with a low voltage exemplary voltage divider

0 by the fact that, in order to increase the speed and accuracy of calibration of the divider at the working high ratio, a reference divider is included in the circuit of the rotatable divider, with the nominal division factor equal to

5 the dividing factor of the inverse divider, and the total resistance is one to two times less, then to the circuit: from the high working voltage, and, combined voltage, falling

0 the shoulders of the dividers, with the output voltage of the checked divider with the short-circuited exemplary divider, determine the actual value of the division factor of the checked divider.