KR930005367Y1 - Three line type resistance testing circuit - Google Patents
Three line type resistance testing circuit Download PDFInfo
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- KR930005367Y1 KR930005367Y1 KR2019900011175U KR900011175U KR930005367Y1 KR 930005367 Y1 KR930005367 Y1 KR 930005367Y1 KR 2019900011175 U KR2019900011175 U KR 2019900011175U KR 900011175 U KR900011175 U KR 900011175U KR 930005367 Y1 KR930005367 Y1 KR 930005367Y1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
Abstract
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Description
제1도는 종래 3선식 저항 측정회로도.1 is a conventional three-wire resistance measurement circuit diagram.
제2도는 본 고안에 따른 3선식 저항 측정회로도.2 is a three-wire resistance measurement circuit according to the present invention.
제3도는 본 고안의 응용 실시예를 보인 온도 측정회로도.3 is a temperature measurement circuit diagram showing an application embodiment of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
V : 기준전원전압 R11, R12: 저항V: reference power supply voltage R 11 , R 12 : resistance
Rt : 측정저항 r1, r2, r3: 도선저항Rt: resistance r 1 , r 2 , r 3 : lead resistance
1, 2, 3 : 도선 10 : 온도측정대상체1, 2, 3: Lead wire 10: Temperature measuring object
본 고안은 3선식으로 저항값을 측정하는 회로에 관한 것으로, 특히 도심저항의 영향을 상쇄시켜 측정오차를 없앰으로써 저항값을 정밀하게 측정할 수 있도록 3선식 저항 측정회로에 관한 것이다.The present invention relates to a circuit for measuring the resistance value in three-wire type, and more particularly to a three-wire resistance measurement circuit to accurately measure the resistance value by canceling the measurement error by canceling the influence of the city resistance.
일반적으로 3선식 저항측정회로는 측온저항체를 이용한 온도측정기나 부하저항 측정에 사용되는데, 종래의 3선식 저항측정회로는 제1도에 도시된 바와 같이 기준전원전압(V)의 음극(-)을 도선(3)을 통해 측정저항(Rt)의 일측에 연결하고, 상기 기준전원전압(V)의 양극(+)을 직렬 접속한 저항(R1), (R2)을 통한 후 도선(2)을 통해 상기 측정저항(Rt)의 일측에 연결하며, 상기 기준전원전압(V)의 양극(+)을 저항(R3)을 통해서는 도선(1)을 다시 통해 상기 측정저항(Rt)의 타측에 연결한 후 상기 저항(R1), (R2)의 접속점(a)과 상기 저항(R3) 및 도선(1)의 접속점(b)의 양단출력전압(Vo)을 이용하여 상기 측정저항(Rt)의 저항값을 측정하게 구성된 것으로, 도면의 설명 중 미설명 부호 r1, r2, r3는 상기 도선(1), (2), (3)의 도선저항을 각기 나타낸다.In general, a three-wire resistance measurement circuit is used to measure a temperature measuring device or a load resistance using a resistance thermometer, and a conventional three-wire resistance measurement circuit uses a negative pole (−) of a reference power supply voltage (V) as shown in FIG. The conductive wire 2 is connected to one side of the measurement resistor Rt through the conductive wire 3 and through the resistors R 1 and R 2 connected in series with the positive electrode + of the reference power supply voltage V. Is connected to one side of the measurement resistance (Rt), and the other side of the measurement resistance (Rt) through the wire (1) again through the positive electrode (+) of the reference power supply voltage (V) through the resistor (R 3 ) connected to a post by using a both sides output voltage (Vo) of the resistor (R 1), (R 2) a connection point (a) and the connection point (b) of the resistor (R 3) and the conductors (1) of the measuring resistance It is configured to measure the resistance value of (Rt), and reference numerals r 1 , r 2 , and r 3 in the description of the drawings indicate the lead resistances of the leads 1, 2, and 3, respectively.
상기 출력전압(Vo)는 다음식(1)로 구할 수 있다.The output voltage Vo can be obtained by the following equation (1).
여기서, A=R1Rt+r1, B=R1+R2+r2C=r3(2R1+Rt+r1+R2+r2) R1=R3로 R3는 R1으로 표시함.Where A = R 1 Rt + r 1 , B = R 1 + R 2 + r 2 C = r 3 (2R 1 + Rt + r 1 + R 2 + r 2 ) R 1 = R 3, where R 3 is R Marked as 1 .
이때 각 도선(1,2,3)의 도선저항(r1,r2,r3)이 r1=r2=r3이면 다음식(2)와 같이 정리할 수 있다.At this time, if the lead resistance (r 1 , r 2 , r 3 ) of each lead ( 1 , 2 , 3 ) is r 1 = r 2 = r 3 can be summarized as in the following equation (2).
여기서, D=(R1+Rt)(R1+R2) E=2r(2R1+R2+Rt) F=3r2단, r=r1=r2=r3따라서, 출력전압(Vo)과 도선저항의 (r)의 값을 알게 되면 상기식(2)을 이용하여 측정하고자 하는 측정저항(Rt)의 값을 구할 수 있게 된다.Where D = (R 1 + Rt) (R 1 + R 2 ) E = 2r (2R 1 + R 2 + Rt) F = 3r 2 where r = r 1 = r 2 = r 3 Therefore, output voltage ( Once the value of Vo) and the wire resistance (r) are known, the value of the measured resistance Rt to be measured can be obtained using Equation (2).
그러나, 도선저항(r)의 저항값을 알기 위해서는 (Rt)대신 사용하여 도선저항(r)의 값을 구한 후 측정저항(Rt)의 값을 구해야 하며, 조정후 실제로 측정저항(Rt)의 값을 측정할 때 도선저항 (r)의 값이 달라지면 측정오차가 발생한다.However, in order to know the resistance value of the wire resistance r, instead of (Rt), the value of the wire resistance r should be obtained and then the value of the measurement resistance Rt must be obtained. If the value of lead resistance (r) changes during measurement, a measurement error occurs.
즉, 측정저항의 값을 측정하기 위해서는 도선저항의 값이 관계되므로 이 도선저항의 값에 의해 측정오차가 발생될 수 있는 문제점이 있었다.That is, in order to measure the value of the measurement resistance, since the value of the conductor resistance is related, there is a problem that a measurement error may occur due to the value of the conductor resistance.
본 고안은 이와 같은 종래의 문제점을 감안하여, 도선저항에 의한 측정오차 발생을 방지하도록 도선저항의 영향을 받지 않는 저항측정 회로를 안출한 것으로, 이를 첨부한 도면을 참조해 상세히 설명하면 다음과 같다.In view of the conventional problems, the present invention devised a resistance measuring circuit which is not influenced by the wire resistance to prevent the measurement error caused by the wire resistance, which will be described in detail with reference to the accompanying drawings. .
제2도는 본 고안에 따른 3선식 저항측정 회로도로서, 이에 도시한 바와 같이 기준전원전압(V)의 음극(-)을 도선(3)을 통해 측정저(Rt)의 일측에 접속하고, 그 기준전원전압(V)의 양극(+)을 저항 (R11)을 통한 후 도선(1)을 다시 통해서는 측정저항(Rt)의 타측에 접속함과 아울러 그 기준 전원전압(V)의 양극(+)을 저항(R12)을 통한 후 도선(2)을 다시 통해서는 측정저항(Rt)의 상기 일측에 접속한 후 상기 저항(R11) 및 도선(1)의 접속점전압(V1)과 상기 저항(R12)및 도선(2)의 접속점 전압(V2)을 측정하여 그로부터 측정저항(Rt)의 값을 구하도록 구성한 것으로, 도면의 설명 중 미설명 부호 r1,r2,r3은 도선(1,2,3)의 도선저항을 각기 나타낸다.FIG. 2 is a three-wire resistance measurement circuit diagram according to the present invention, and as shown therein, a cathode (-) of the reference power supply voltage V is connected to one side of the measuring base Rt through the conductor 3, and the reference is shown. After connecting the positive pole (+) of the power supply voltage (V) through the resistor (R 11 ) and through the lead wire (1) again to the other side of the measurement resistor (Rt), the positive pole (+) of the reference power supply voltage (V) is connected. ), the resistance (R 12) the resistors (R 11) and a connection point voltage of the conductor (1) (V 1) through back the wire (2) is then connected to the one side of the measurement resistance (Rt) through the said resistance (R 12) and that are configured to obtain the value of the conductor (2) measuring the resistance (Rt) from which to measure the junction voltage (V 2), the reference numeral of the description of the drawings r 1, r 2, r 3 is The lead resistances of the lead wires 1, 2 and 3 are respectively shown.
이와 같이 구성한 본 고안의 작용 및 효과를 설명하면 다음과 같다.Referring to the operation and effects of the present invention configured as described above are as follows.
기준전원전압(V)의 양극(+)에서 저항(R11)을 통하여 흐르는 전류를 I1이라 하고, 저항(R12)을 통하여 흐르는 전류를 I2라 하면, 도선(3)을 통해 기준전원전압(V)의 음극(-)으로 흘러들어가는 전류(I)는 하기의 식(3)과 같이된다.A current flowing through the resistor R 11 at the anode (+) of the reference power supply voltage V is referred to as I 1 , and a current flowing through the resistor R 12 is referred to as I 2 . The current I flowing into the negative electrode (-) of the voltage V becomes as shown in Equation (3) below.
또한, 저항(R11) 및 도선(1)의 접속점에 나타나는 전압(V1)은, 측정저항(Rt) 및 도선저항(r1)에 흐르는 전류(I1)에 의한 전압강하와 도선저항(r3)에 흐르는 전류(I)에 의한 전압강하의 합이므로 하기의 식(4)와 같이 된다.In addition, the voltage V 1 appearing at the connection point between the resistor R 11 and the lead 1 has a voltage drop due to the current I 1 flowing through the measurement resistor Rt and the lead resistance r 1 and the lead resistance ( Since the sum of the voltage drops due to the current I flowing in r 3 ), it becomes as follows.
또한, 저항 (R12) 및 도선(2)의 접속점에 나타나는 전압(V2)도 상기 전압(V1)과 같은 원리에 의해 하기의 식(5)와 같이 된다.In addition, the voltage V 2 appearing at the connection point of the resistor R 12 and the conducting wire 2 also becomes the following formula (5) on the same principle as the voltage V 1 .
또한, 상기 전류(I1)는 기준전압전압(V)과 상기 전압(V1)과의 차이에 의해 저항(R11)에 흐르는 값이므로 하기의 식(6)과 같이된다.In addition, since the current I 1 is a value flowing through the resistor R 11 by the difference between the reference voltage V and the voltage V 1 , the current I 1 is expressed by Equation 6 below.
또한, 상기 전류(I2)도 상기 전류(I1)와 마찬가지로 하기의 식(7)과 같이 된다.In addition, the current I 2 also becomes the following equation (7) similarly to the current I 1 .
따라서, 상기 식(6), (7)를 상기 식(4), (5)에 각기 대입하면 전압(V1)(V2)은 하기의 식(8), (9)와 같이 된다.Therefore, when the above formulas (6) and (7) are substituted into the above formulas (4) and (5), the voltages V 1 and V 2 are as shown in the following formulas (8) and (9).
여기서, 저항(R11), (R12)의 값을 동일하게 하여 그 값을 R11이라 하고, 도선(1,2,3)의 도선저항(r1,r2,r3)값을 동일하게 보아 그 값을 r이라 하면, 상기의 식(8), (9)는 하기의 식(10), (11)과 같이 된다.Here, the values of the resistors R 11 and R 12 are the same, and the value is R 11 , and the values of the conductor resistances r 1 , r 2 , and r 3 of the conductors 1 , 2 , 3 are the same. If the value is r, the above formulas (8) and (9) become the following formulas (10) and (11).
상기 식(11)을 r항으로 정리하면 하기의 식(12)와 같이 된다.Summarizing the above formula (11) into the r term, the following formula (12) is obtained.
또한, 상기 식(10)을 Rt항으로 정리하면 하기의 식(13)과 같이 된다.In addition, summarizing the said Formula (10) by the Rt term, it becomes as following Formula (13).
따라서, 상기 식(13)에 상기 식(12)를 대입하여 정리하면 하기의 식(14)와 같다.Therefore, substituting the said Formula (12) into said Formula (13) and arrange | positions it is as following Formula (14).
결국, 측정하고자 하는 저항 즉, 측정저항(Rt)의 값을 구하기 위해서는 상기의 식(14)에서 알 수 있는 바와 같이 저항(R11)값, 기준전원전압(V), 측정된 전압(V1,V2)만이 필요하고, 도선저항(r1,r2,r3)의 저항값을 전혀 고려할 필요가 없게되며, 이에 따라 도선저항(r1,r2,r3)에 의한 오차는 발생하지 않게 된다.As a result, in order to obtain the value of the resistance to be measured, that is, the measurement resistance Rt, as can be seen in Equation (14), the value of the resistance R 11 , the reference power supply voltage V, and the measured voltage V 1 , requires only V 2), the lead resistance (r 1, and r 2, r 3) will not need to consider all the resistance value of, so that errors due to lead resistance (r 1, r 2, r 3) is generated You will not.
그리고, 제3도는 본 고안의 응용실시예로서 온도측정 회로도인데, 이에 도시한 바와 같이 기준전원전압(V)의 양극(+)을 저항(R11)(R12)을 각기 통한 후 단자(a)(b)를 통해 온도측정대상체(10)의 온도에 따라 저항값이 가변되는 측온저항(RT)의 일측 및 타측에 연결하고, 그 측온저항(RT)의 타측을 단자(c)을 통해 상기 기준전원전압(V)의 음극(-) 인 접지에 연결한 후 상기 단자(a)(b)의 전압(V1)(V2)을 측정하여 상기 식(14)에 대입하면, 측온저항(RT)의 저항값을 계산할 수 있고, 이에 따라 온도대 저항(RT)값 표를 이용하여 온도측정 대상체(10)의 온도를 구할 수 있다.In addition, FIG. 3 is a temperature measurement circuit diagram as an embodiment of the present invention. As shown in FIG. 3, the terminal (a) is passed through the positive electrode (+) of the reference power supply voltage (V) through the resistors (R 11 ) and (R 12 ). (b) is connected to one side and the other side of the RTD whose resistance value varies depending on the temperature of the temperature measuring object 10, and the other side of the RTD is connected through the terminal (c). After connecting to the ground which is the negative (-) of the reference power supply voltage (V), measure the voltage (V 1 ) (V 2 ) of the terminals (a) and (b) and substitute the above equation (14). The resistance value of RT) may be calculated, and thus, the temperature of the temperature measuring object 10 may be obtained using the temperature band resistance (RT) table.
이상에서 설명한 바와 같이 본 고안은 종래의 3선식 저항측정회로의 문제점인 도선저항값이 측정하고자 하는 측정저항값에 영향을 주지 않으므로 오차없는 정확한 저항값을 측정할 수 있는 효과가 있다.As described above, the present invention does not affect the measurement resistance value to be measured, which is a problem of the conventional three-wire resistance measurement circuit, so that an accurate resistance value without error can be measured.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900011175U KR930005367Y1 (en) | 1990-07-28 | 1990-07-28 | Three line type resistance testing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900011175U KR930005367Y1 (en) | 1990-07-28 | 1990-07-28 | Three line type resistance testing circuit |
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| Publication Number | Publication Date |
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| KR920003076U KR920003076U (en) | 1992-02-25 |
| KR930005367Y1 true KR930005367Y1 (en) | 1993-08-16 |
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| KR2019900011175U KR930005367Y1 (en) | 1990-07-28 | 1990-07-28 | Three line type resistance testing circuit |
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