CN207601186U - Resistance test circuit - Google Patents
Resistance test circuit Download PDFInfo
- Publication number
- CN207601186U CN207601186U CN201721762175.1U CN201721762175U CN207601186U CN 207601186 U CN207601186 U CN 207601186U CN 201721762175 U CN201721762175 U CN 201721762175U CN 207601186 U CN207601186 U CN 207601186U
- Authority
- CN
- China
- Prior art keywords
- resistance
- test
- test probe
- ammeter
- probe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model provides a kind of resistance test circuit, including：Testing resistance (Rt1)；Voltage source (11)；First ammeter (12)；First test probe (14)；Second test probe (15)；Known resistance (Rn1)；Third test probe (16)；Second ammeter (13)；With the 4th test probe (17).Resistance test circuit further includes predetermined resistance (Rk), predetermined resistance (Rk) has predetermined resistance value, wherein first test probe (14) and third test probe (16) are connected to the first end of testing resistance (Rt1), 4th test probe (17) is connected to the first end of predetermined resistance (Rk), and the second test probe (15) is connected to the second end of testing resistance (Rt1) and the second end of predetermined resistance (Rk).The resistance test circuit of the utility model allows four connectivity ports/test probe of test circuit to be suitably attached in circuit-under-test, while ensure necessary resistance test precision.
Description
Technical field
The utility model is related to a kind of resistance test circuits.
Background technology
In the prior art, there is known two methods, one of which test method needs for the test of the resistance value of low resistance
Dependent on complicated calculating, it the shortcomings that be to be difficult to demarcate, usually in the case calibration can only by original vendor Lai
Implement；Another test method is exactly to connect to be tested using four leads of standard.In the test electricity of four leads connection
Lu Zhong, it is what there is no problem to carry out calibration, but it needs to use four connectivity ports.In some test scenarios, such as one
In the case of a little welding kesistance tests, there is no enough spaces in circuit-under-test to accommodate this four connectivity ports, particularly have
When circuit-under-test there is no enough spaces to accommodate the special connection terminal that can not mechanically reduce the size.In the case,
It is difficult to successfully carry out testing for four lead connections.
Utility model content
In view of the above-mentioned technical problem of the prior art, the purpose of this utility model is that a kind of resistance test circuit is developed,
The resistance test circuit allow four leads connect test circuit four connectivity ports/test probe be suitably attached to by
In slowdown monitoring circuit, while ensure necessary resistance test precision.
In order to achieve the goal above, the utility model provides a kind of resistance test circuit, which includes：
Testing resistance；
Voltage source；
First ammeter, the first end of first ammeter are wired to the first end of the voltage source；
First test probe, the second end of first ammeter are wired to the first test probe；
Second test probe, the second end of the voltage source are wired to the second test probe；
Known resistance with fixed resistance value；
Third tests probe, and the third test probe is wired to the first end of the known resistance；
Second ammeter, the second end of the known resistance are wired to the first end of second ammeter；
4th test probe, the 4th test probe are wired to the second end of second ammeter,
It is characterized in that,
The resistance test circuit further includes：Predetermined resistance, the predetermined resistance have predetermined resistance value,
In, the first test probe and the third test the first end that probe is connected to the testing resistance, the 4th test
Probe is connected to the first end of the predetermined resistance, and the second test probe is connected to second end and the institute of the testing resistance
State the second end of predetermined resistance.
Preferably, the predetermined resistance is the phase resistance of the single phase winding in the three-phase coil of motor, and the electricity to be measured
Resistance is the welding kesistance of the at one end positioned at the single phase winding.
In terms of technique effect, by the resistance test circuit of the utility model, the test that four leads can allow for connect
Four connectivity ports/test probe of circuit is suitably attached in circuit-under-test, while ensures necessary resistance test essence
Degree.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical solution of the embodiment of the utility model
Attached drawing to be used is briefly described.
Fig. 1 is the schematic diagram of the resistance test circuit of traditional four leads connection.
Fig. 2 is the schematic diagram of the three-phase coil of motor.
Fig. 3 shows the schematic diagram of the resistance test circuit of four leads connection according to the present utility model.
Specific embodiment
In order to enable those skilled in the art to better understand the technical solutions of the present invention, below in conjunction with this practicality
Novel relevant attached drawing, is clearly and completely described the technical solution in the embodiment of the utility model.
Fig. 1 is the schematic diagram of the resistance test circuit of traditional four leads connection.Fig. 2 is the signal of the three-phase coil of motor
Figure.Fig. 3 shows the schematic diagram of the resistance test circuit of four leads connection according to the present utility model.
In the resistance test circuit of Fig. 1, testing resistance Rt is located at the centre of the circuit diagram, which also wraps
It includes：Voltage source 1, voltage source 1 are capable of providing stable voltage output；First ammeter 2, the first end of the first ammeter 2 pass through
Conducting wire is connected to the first end of voltage source 1, and the first ammeter 2 is for measuring the electric current by the ammeter, and itself has
There is the negligible resistance of very little；First test probe 4, the second end of the first ammeter 2 are wired to the
One test probe 4；Second test probe 5, the second end of voltage source 1 are wired to the second test probe 5；Known resistance
Rn, it is known that resistance Rn is disposed on the fixed resistance in measuring system, and resistance value is fixed and is known larger resistance；
Third tests probe 6, and third test probe 6 is wired to the first end of known resistance Rn；Second ammeter 3, it is known that
The second end of resistance Rn is wired to the first end of the second ammeter 3, and the second ammeter 3 passes through the electric current for measuring
The electric current of table, and itself has the negligible resistance of very little；4th test probe 7, the 4th test probe 7 are logical
Cross the second end that conducting wire is connected to the second ammeter 3.In the resistance for testing testing resistance Rt, the first test probe 4 and third
Test probe 6 is connected to the first end of testing resistance Rt, and the second test probe 5 and the 4th tests probe 7 and is connected to testing resistance
The second end of Rt.
In Fig. 1, resistance R1 represents the resistance on from the first end of voltage source 1 to the p-wire of the first test probe 4；Electricity
Hinder the resistance that R2 expressions are tested from the second end of voltage source 1 to second on the p-wire of probe 5；Resistance R3 represents to test from third
Resistance on probe 6 to the p-wire of the first end of known resistance Rn；Resistance R4 is represented from the 4th test probe 7 to known resistance
Resistance on the p-wire of the second end of Rn.Resistance R1, resistance R2, resistance R3, the resistance value of resistance R4 are usually all smaller.
The current value that the first ammeter 2 is flowed through in test is represented with A1, and the electric current of the second ammeter 3 is flowed through in test
Value represents that then in the ideal case, the resistance test circuit connected by four lead can be obtained with equation below to be treated with A2
The resistance value of measuring resistance Rt：
Rt=(Rn+R3+R4) * A2/ (A1-A2),
Wherein in above-mentioned formula, Rt represents the resistance value of resistance Rt, and Rn represents the resistance value of resistance Rn, and R3 represents resistance
The resistance value of R3, R4 represent the resistance value of resistance R4.
Further, in the case where the resistance value of resistance R3 and R4 are all very small, electricity to be measured can be obtained with equation below
Hinder the resistance value of Rt：
Rt=Rn*A2/ (A1-A2),
Wherein in above-mentioned formula, Rt represents the resistance value of resistance Rt, and Rn represents the resistance value of resistance Rn.
However, there is no enough skies in circuit-under-test in the case of such as some welding kesistances test in actual test
Between accommodate four connectivity ports/test probe, particularly sometimes circuit-under-test there is no enough spaces accommodate mechanically without
The special connection terminal of method minification.For example, Fig. 2 is the schematic diagram of the three-phase coil of motor, wherein, three-phase coil is in triangle
Shape connects, and reference numeral 8 represents the phase resistance of each phase coil, and reference numeral 9 represents the welding electricity of the at one end of single phase winding
Resistance.In practice, the resistance value of test welding kesistance 9 is needed.But in actual coil structure, in welding kesistance 9 and mutually electricity
Between resistance 8 thus (such as the part marked in Fig. 2 with circle) causes to be difficult to without enough two test probes of space
Successfully carry out the resistance test of four lead connections.
To solve the above-mentioned problems, the utility model provides resistance test circuit as shown in Figure 3.In the electricity of Fig. 3
It hinders in test circuit, testing resistance Rt1 is located at the centre of the circuit diagram, and testing resistance Rt1 is, for example, the triple line positioned at motor
The welding kesistance of the at one end of single phase winding in circle, the resistance test circuit further include：Voltage source 11, voltage source 11 can carry
For stable voltage output；First ammeter 12, the first end of the first ammeter 12 are wired to the of voltage source 11
One end, the first ammeter 12 is for measuring the electric current by the ammeter, and itself has can be ignored for very little
Resistance；First test probe 14, the second end of the first ammeter 12 are wired to the first test probe 14；Second surveys
Needle 15 is soundd out, the second end of voltage source 11 is wired to the second test probe 15；Known resistance Rn1, it is known that resistance Rn1
The fixed resistance being disposed in measuring system, resistance value are fixed and are known higher values；Third tests probe 16,
Third test probe 16 is wired to the first end of known resistance Rn1；Second ammeter 13, it is known that the of resistance Rn1
Two ends are wired to the first end of the second ammeter 13, and the second ammeter 13 passes through the electricity of the ammeter for measuring
Stream, and itself has the negligible resistance of very little；4th test probe 17, the 4th test probe 17 is by leading
Line is connected to the second end of the second ammeter 13.The resistance test circuit of Fig. 3 further includes：Predetermined resistance Rk, predetermined resistance Rk can
To measure to know in advance by known measuring method of the prior art.Predetermined resistance Rk is, for example, in the three-phase coil of motor
Single phase winding phase resistance.
In the resistance test circuit of Fig. 3, in the resistance for testing testing resistance Rt1, the first test probe 14 and third
Test probe 16 is connected to the first end of testing resistance Rt1, and the second test probe 15 is connected to the second end of testing resistance Rt1,
4th test probe 17 is connected to the first end of predetermined resistance Rk, and the second end of predetermined resistance Rk is connected to the second test probe 15
With the second end of testing resistance Rt1.
In figure 3, resistance R11 represents the electricity on from the first end of voltage source 11 to the p-wire of the first test probe 14
Resistance；Resistance R21 represents the resistance on from the second end of voltage source 11 to the p-wire of the second test probe 15；Resistance R31 is represented
Resistance from third test probe 16 to the p-wire of the first end of known resistance Rn1；Resistance R41 represents to visit from the 4th test
Resistance on needle 17 to the p-wire of the second end of known resistance Rn1.Resistance R11, resistance R21, resistance R31, resistance R41 electricity
Resistance value is usually all smaller.
The current value that the first ammeter 12 is flowed through in test is represented with A11, flows through the second ammeter 13 in test
Current value represents that then in the ideal case, the resistance test circuit connected by four lead can be obtained with equation below with A21
Go out the resistance value of testing resistance Rt1：
Rt1=(Rn1+R31+R41+Rk) * A21/ (A11-A21),
Wherein in above-mentioned formula, Rt1 represents the resistance value of resistance Rt1, and Rn1 represents the resistance value of resistance Rn1, R31 tables
Show the resistance value of resistance R31, R41 represents the resistance value of resistance R41, and Rk represents the resistance value of resistance Rk.
Further, because the resistance value of resistance R3 and R4 are all very small, it is possible to obtain testing resistance with equation below
The resistance value of Rt1：
Rt1=(Rn1+Rk) * A21/ (A11-A21),
Wherein in above-mentioned formula, Rt1 represents the resistance value of resistance Rt1, and Rn1 represents the resistance value of resistance Rn1, and Rk is represented
The resistance value of resistance Rk.
Further, under some specific conditions, since the resistance value of resistance Rk is also smaller (relative to resistance R3-R4's
Resistance value is still bigger), it is possible to continuing simplified above-mentioned formula is：
Rt1=Rn1*A21/ (A11-A21).
The purpose of above-mentioned simplification is to be transformed more conveniently using existing complete set of equipments, while can also be acceptable
Error range in easily measure the resistance value of resistance Rt1.Although calculation formula, as existing method, they are actually
Belong to different method and design.
By the resistance test circuit of the utility model, four connecting pins of test circuit that four leads can allow for connect
Mouth/test probe is suitably attached in circuit-under-test, while ensures necessary resistance test precision.
The above is only specific embodiment of the utility model.It should be pointed out that the ordinary skill for the art
For personnel, under the premise of the principle and design for not departing from the utility model, the feature of above-described embodiment can also be carried out
Several improvement and modification are made in various combinations, these combinations, improvement and modification also should be regarded as falling the protection in the utility model
Within scope and spirit.
Claims (2)
1. a kind of resistance test circuit, including：
Testing resistance (Rt1)；
Voltage source (11)；
First ammeter (12), the first end of first ammeter (12) are wired to the of the voltage source (11)
One end；
First test probe (14), the second end of first ammeter (12) are wired to the first test probe
(14)；
Second test probe (15), the second end of the voltage source (11) are wired to the second test probe
(15)；
Known resistance (Rn1) with fixed resistance value；
Third test probe (16), third test probe (16) are wired to the of the known resistance (Rn1)
One end；
Second ammeter (13), the second end of the known resistance (Rn1) are wired to second ammeter (13)
First end；
4th test probe (17), the 4th test probe (17) are wired to the of second ammeter (13)
Two ends,
It is characterized in that,
The resistance test circuit further includes：Predetermined resistance (Rk), the predetermined resistance (Rk) have predetermined resistance value,
Wherein, the first test probe (14) and third test probe (16) are connected to the first of the testing resistance (Rt1)
End, the 4th test probe (17) are connected to the first end of the predetermined resistance (Rk), and the second test probe (15) is even
It is connected to the second end of the testing resistance (Rt1) and the second end of the predetermined resistance (Rk).
2. resistance test circuit according to claim 1, which is characterized in that
The predetermined resistance (Rk) is the phase resistance of the single phase winding in the three-phase coil of motor, and the testing resistance (Rt1)
It is the welding kesistance of the at one end positioned at the single phase winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721762175.1U CN207601186U (en) | 2017-12-15 | 2017-12-15 | Resistance test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721762175.1U CN207601186U (en) | 2017-12-15 | 2017-12-15 | Resistance test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207601186U true CN207601186U (en) | 2018-07-10 |
Family
ID=62766081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721762175.1U Active CN207601186U (en) | 2017-12-15 | 2017-12-15 | Resistance test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207601186U (en) |
-
2017
- 2017-12-15 CN CN201721762175.1U patent/CN207601186U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2005300495A (en) | Semiconductor characteristic measuring apparatus and connecting device | |
| CN113447885B (en) | Electric energy meter wrong wiring rapid detection circuit and device | |
| CN103675459A (en) | Method for measuring conductor resistance in integrated circuit | |
| CN102590632B (en) | Insulation resistance test circuit for circuit board | |
| ES2920857T3 (en) | Mobile Transformer Test Device and Procedure for Testing a Power Transformer | |
| CN108008193A (en) | Combined type quantum Hall resistance sample ratio checker | |
| CN109085427A (en) | A kind of analog equivalent milliohm to micro-ohm magnitude D.C. resistance bridge-type resistance | |
| US5272445A (en) | Resistance tester utilizing regulator circuits | |
| CN207601186U (en) | Resistance test circuit | |
| CN203688599U (en) | Four-wire test fixture | |
| CN102590630B (en) | The method for testing resistance of the test probe of semiconductor parametric tester device | |
| CN210346590U (en) | Wireless static strain tester and wireless static strain test system | |
| CN208172234U (en) | A kind of no-load voltage ratio of current transformer, Check up polarity experimental rig | |
| CN102466788B (en) | Universal meter calibration source | |
| CN105372498A (en) | Shunt impedance parameter determining method for measuring transient current | |
| CN111123073B (en) | Quick self-checking device of hardware board card | |
| CN210015172U (en) | Novel three-phase nuclear phase instrument | |
| CN105890808A (en) | Temperature calibrator for main transformer | |
| JP2018071996A (en) | Calibration test device | |
| CN208125876U (en) | A kind of triode Kelvin test suite | |
| CN2347182Y (en) | Watt-hour meter wiring tester | |
| CN101918851A (en) | Voltage source measurement unit with minimized common mode errors | |
| CN104614589A (en) | Lead-resistance-removed resistance signal source and resistance measuring circuit thereof | |
| CN205642673U (en) | A temperature check gauge for main transformer | |
| CN218546797U (en) | Kelvin four-wire test system realized through internal circuit of switch matrix |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |