SU1716454A1 - Of electrical resistance and conductivity - Google Patents

Abstract

This invention relates to electrical measuring technology. The purpose of the invention is to increase the upper limit. and increase accuracy. The electrical resistivity and conductivity simulator contains a digital divider .6 of a Kelvin – Varle voltage, microprocessor control unit 12, processing - information presentation operational amplifier 7, first and second current terminals 1.2, first and second potential terminals 4.5. With the introduction of the third current clamp 3S stores 8 - 10 resistances. control information channel 11, display 13, first and second controlled multiresistors 14 and 15, control information channels 16 and 17 will increase the upper limit and increase accuracy. 2 Il. i (i

Description

  1

The invention relates to electrical measuring equipment, namely, electrical resistance and conductivity simulators.

The purpose of the invention is to increase the upper limit and increase accuracy.

FIG. Figure 1 shows the structural electrical circuit of the proposed device; Fig. 2 shows a table of factors of multipliers (of this order, the conductivity between clamps 1 and 2).

The electrical resistance and conductivity simulator contains the first 1, second 2 and third 3 current terminals, the first 4 and second 5 potential terminals, the Kelvin – Barle digital voltage divider, an operational amplifier 7, 8–10 resistance stores, the control information channel - nations 11, microprocessor control unit 12, information display processing with display 13, first 14 and second 15 controlled multipliers, control information channels 16 and 17.

The device works as follows.

The first controlled multiresistor 14 is connected by a microprocessor unit 12 to a control information channel 16, according to which the required value of the resistance R of this multiresistor from f

 10g; Yu3;

 Y5; Yu6;

J7;

108: 10H

ten

o .10 5 10

g

Ohm (1)

The second controlled multiresistor 15 is connected to the microprocessor unit 12 by the control channel 17 - information, according to which the corresponding resistance R of this multiresistor can be established from the series by the corresponding command codes.

R2 (M-1) R, (2)

where R is the input impedance of the digital voltage divider 6; And 1, 10, U2, 10E, 104 - scale factor. The operation of the three-pole A 2-z base on converting the input signal - voltage V from the side of current clamps 1 and 2 into the output current I, from the side of the first current (base) clamp 1 with the potential of the third current clamp 3 equal to the potential of the first current clamp 1, those.

Q

5 0 5

0

five

five

when equipotential ™ clamps when the condition

,

0

1 and 3,

(3)

as a result, in a three-pole, potential differences — voltages between the two remaining pairs of clamping terminals 1-2 and 2-3 are equal to the input signal — voltage V, namely:

V. (4) The voltage V applied to the poles 2-3 (2-1) is converted into a signal U at the output of the digital voltage divider 6, defined by the formula

UVE XTR + tf- V. (five)

The signal (5) of the operational amplifier 7 repeats between its output and the common output connected to the non-inverting input of this amplifier and the corresponding output of the multiresistor 14, IB resulting in the condition of (3) through the resistance RI of this multiresistor and the first current terminal 1. will leak current

. ir .ju, (6)

whence reproducible (simulated) between clips 1 and 2 of technical port & (2-s conductivity

-2-3

GH x See,

-eleven

R 0, x

x;

...

where (, x, ... x

if

(7)

.x - normalized mantissa; Cm - scale factor. scales (7).

When (1) and (2) the indicator P is an integer from the p yes

 -four; -five; -6; -7: -8; -9;

-ten; -eleven; -12; -13; -14; -15. (eight)

Therefore, the proposed device has the following conductivity scales:

(9)

Sy, l. 0, x, hgh3kh gy

- "

Cm;

X X

.

chz

, X4x4x50-10 3 Cm;

Si ,, x, x40-0 1iTH Sm; Gh (x, sm;

Using a microprocessor block 12, any of the conductivities of the array (9) can be replaced by an equivalent

resistance. {

(ten)

those. in the end, the array (9) in accordance with (10) -can be mapped into an array of equivalent resistances (i

CI (x ,, ... x -... xk-10 ohm; 15

 , ... x .... xK J2 Ohm;

 , .., x | ... xk-10 ohm; (eleven

I, i

(, ..., x -.... Hz.Yu Om;

R x | , x2XjX x 10 ohm; i S + Om; R,, x..X} 10 + VOM;

t4- f 4

, x2-10 Ohm; ,,

l

ranging from 10 ohms (10 cm) to 10 and 60m ().

The microprocessor unit 12 can also solve the inverse problem, i.e. the first and the required resistances from the array (11) of resistance R to equivalent conductors

-one

g p

mi

(12)

which allows the proposed device to be used not only as a multi-terminal measure of electrical conductivity, but also as a multi-range measure of resistance, from the microprocessor unit 12, the numerical value of the required resistance can be set on the display 13:.

, ... Xi ... x | -10fPOM. (13)

Microprocessor unit 12 will recalculate by itself (12) this resistance value (13) into equivalent, conductivity

R

Ci0, x, ... x; ... xk-.tO See, (14)

encodes (14) and displays. (14) command codes for the corresponding ka5

0

five

The control information will bring the components of the device to the executive bodies, as a result of which this device reproduces the conductivity (14) - resistance (13). .

In the arrays (9) and (11), incomplete sets of scales of multi-limiting electrical conductivity - resistance are presented, since their full set, given only for conductivity, is much larger, as follows from FIG. 2, where scale factor values of .10 Cm are given, depending on the choice of certain values of M and the resistance RI.

Claims (1)

20 claims 25 thirty 35 40 45; h 50 . 55 4 - An electrical resistance and conductivity imitator containing a Kelvin – Varle digital voltage divider, the code input of which is connected to the output of the microprocessor control unit, information processing and presentation, and the output to the inverting input of the operational amplifier, as well as the first and second current terminals and the first and second potential terminals, characterized in that, in order to increase the upper limit and increase accuracy, a third current terminal and first and second controlled resistors, screen They are connected to the common bus of the device, the non-inverted input of the operational amplifier is connected by the midpoint of the power source of the operational amplifier and connected to one output of the first controlled multiresist, the other output of which is connected to the first current terminal and the first potential terminal of the device, to the signal input A Kelvin-Varle digital voltage divider connected one output of the second controlled multiresistor connected to the second potential terminal, and the other output of the second controlled the multiresistor is connected to the second current terminal of the device, while the output of the operational amplifier is connected to the common bus and connected to the third current terminal of the device. H I