SU1376058A1 - Device for calibrating geophysical voltage instrument transducers - Google Patents

Abstract

This invention relates to electrical measuring technology and can be used in exploration geophysics. The purpose of the invention is to improve the accuracy of calibration of geophysical voltage transducers. The device contains a generator, an oscilloscope, an adder, a current divider and measuring electrodes. The goal is achieved by the fact that the device provides the reference voltage from the voltage divider to the transducer to be transformed through a double layer electrode - soil, 1 sludge. i (Л С

Description

with f

SP

OS

113

The invention relates to electrical measuring technology and can be used in geoelectronic departmental metrological services for the calibration of measuring transducers in field conditions of use.

The purpose of the invention is to improve the accuracy of calibration of geophysical voltage transducers.

The drawing shows a diagram of a device for calibrating geophysical voltage measuring transducers.

The device contains a generator 1,. Oscillograph 2, divider 3 voltage, adder 4. One oscilloscope 2 inputs are connected to oscillator 1, divider 3 input and one of adder 4 inputs, adder output connected to the second oscilloscope input 2, transducer 5 is connected to input c grounded measuring electrode 6 directly, ac grounded measuring electrode 7 through the output terminals of the divider 3, the output of the inverter 5 is connected to the second input of the adder 4. In case the tunable converter is nominally non-inverted yuschy, one input of the adder must be non-inverting and second inverting; if the transferable converter is nominally inverting, then both inputs of the adder must be either inverting or both non-inverting.

The device works as follows:

time 40

U voltage. from generator 1, scaled by divider 3 with a division factor K:

s

U K

(15

It is supplied through grounded measuring electrodes 6 and 7 to the input of a transducer to be turned 5 with a nominal conversion factor, with K and the total error of the converter and grounded electrodes equal to Y, the total phase error equal to f.

The output of the inverter 5 voltage

and 5

 +)

(2)

where j.

Voltage U., at the output of the adder A with the conversion factor K of the input voltage

ten

and.

 (and -

(3)

or subject to (1) and (2)

and, () and, to.

(four)

If we choose the nominal coefficient K 2 of the divider dividers 3 and the voltage equal to the nominal conversion factor K g of the transducer to be turned 5, then

and (r + j4).

This means that if

(five)

one

and cos and) t

(6)

and

ten

about)

is the amplitude of the output voltage of the generator;

- round cha, stota.

that

and; uki

/, ten

cosuJt sinuit. (7)

 1O

Consequently, an ellipse is observed on the oscilloscope screen with the following characteristics for the vertical deflection voltage U / and the horizontal deflection voltage

: at times

S

- integer /) t +; si nuJ t.

nir / 7J (g

 0;

50

(eight)

V (t t) is Cheka, and, o; and; 0

Consequently, the ordinate Y, corresponding to the maximum deviation along the X axis, can be used to estimate the error of the transducer to be turned

and

and,

(at and

UIMPK)

C

ten

K.UIO

and the ordinate Y, which corresponds to the zero value of X, can be used to estimate the error of the transducer to be turned

and

 U (at ui 0)

and

ten

to; and, o

The device supplies the reference voltage from the output of the voltage divider 3 along one branch to one input of the converter 5, and along the second branch through the measuring electrode 7, the double layer electrode 7 - the soil, the double layer soil - electrode 6 and

ten

f5

20 25

electrode 6 to the second input of the converter 5;

Claims (1)

Invention Formula A device for calibrating geophysical voltage measuring transducers, comprising a generator, an oscilloscope connected to it and one adder, characterized in that, in order to improve accuracy, it is equipped with a voltage divider, whose input and one of the adder outputs are connected to a generator another input of the adder to the input of the converter, and the output of the adder to the second input of the oscilloscope, while one of the measuring electrodes is connected to the input of a turnable converter through the output terminals of the divider the second measuring electrode is connected directly to the transducer to be tested.