CN203275627U - DC resistance tester calibration system - Google Patents
DC resistance tester calibration system Download PDFInfo
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- CN203275627U CN203275627U CN 201220629798 CN201220629798U CN203275627U CN 203275627 U CN203275627 U CN 203275627U CN 201220629798 CN201220629798 CN 201220629798 CN 201220629798 U CN201220629798 U CN 201220629798U CN 203275627 U CN203275627 U CN 203275627U
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- 238000005259 measurement Methods 0.000 claims description 42
- 238000000034 method Methods 0.000 abstract description 4
- 238000004164 analytical calibration Methods 0.000 description 4
- 239000010421 standard material Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses a DC resistance tester calibration system. The system uses a method of electrical virtual reproducing actual resistors. Input impedance of a voltage feedback end of a DC resistance tester is obtained according to a first calibration branch, and output current of the DC resistance tester is obtained according to a second calibration branch, so that the actual resistors are virtually reproduced. The system uses the method of virtual reproducing actual resistors to calibrate the DC resistance tester, and solves problems that resistance values of actual resistors cannot completely cover a resistance measuring range of the DC resistance tester since in the prior art, calibration of the DC resistance tester uses a multipoint calibration method, and differences of current output gears and resistance measuring ranges of different DC resistance testers are relatively large, and resistance values of the actual resistors are single.
Description
Technical field
The utility model relates to the electrical instrumentation calibration technology, relates in particular a kind of instrument for measuring DC resistance calibration system.
Background technology
Instrument for measuring DC resistance is to have micro-ohm, milliohm or the resistance apparatus of high range more, its range ability is generally at 0 Ω～100k Ω, its main application is resistance, conductor resistance, contact resistance, welding resistance and the rivet connection resistance of test coil, is widely used in engineering test.
The instrument for measuring DC resistance measuring resistance adopts the current and voltage method of four-terminal measurement.Built-in DC current source in instrument for measuring DC resistance, when the DC current I of DC current source output flows through measured resistance, the measured resistance two ends will produce voltage drop U, instrument for measuring DC resistance is by detecting this voltage drop U and current source output current I, and utilize Ohm law R=U/I, calculate the resistance value of measured resistance.
Must calibrate it before using the instrument for measuring DC resistance measured resistance value, generally can be according to the principle of above-described instrument for measuring DC resistance measuring resistance, with the standard of known value resistance in kind as measured resistance, the resistance value of the resistance value that instrument is recorded and this standard resistance in kind is made comparisons, in order to determine whether the measured value of this instrument for measuring DC resistance is accurate, realizes alignment purpose.Yet, because different instrument for measuring DC resistance electric current output gear, resistance measurement scope difference are larger, need to examine the resistance measurement performance of the different electric current gears of this instrument for measuring DC resistance during calibration, carry out again the multiple spot calibration for each electric current gear.Be equipped with at standard resistance in kind, just need to produce in advance a plurality of rated current, the standard of a plurality of different resistance values resistance in kind.For example, be 200 Ω～20k Ω by alignment leakage resistance tester 1mA current gear resistance measurement scope, 1A current gear resistance measurement scope is 100m Ω～20 Ω, 10A current gear resistance measurement scope is 1m Ω～2 Ω, for realizing the calibration to a plurality of measurement points of its different electric current gear, the specification difference that standard resistance in kind is equipped with is very large, quantity is various, invest huge, and adopt this mode to be difficult to reach the covering fully of different resistance meters being measured range, thereby increased complexity and the difficulty of calibration operation.
The utility model content
In view of this, the utility model provides a kind of instrument for measuring DC resistance calibration system, to reduce calibration difficulty and the complexity of instrument for measuring DC resistance, improves the convenience of calibration.
For achieving the above object, the utility model provides following technical scheme:
A kind of instrument for measuring DC resistance calibration system comprises: instrument for measuring DC resistance to be calibrated, the first calibration branch road and the second calibration branch road;
Wherein, two exits of described the first calibration branch road are connected with two pressure feedback ports of described instrument for measuring DC resistance respectively;
Two exits of described the second calibration branch road are connected with two current output terminals of described instrument for measuring DC resistance respectively;
Described the first calibration branch road comprises: measure first current measurement module of the first current value of described the first calibration branch road of flowing through and the voltage source output module of connecting with described the first current measurement module, wherein said voltage source output module can provide the output voltage of different magnitudes of voltage;
Described the second calibration branch road comprises: measure the second current measurement module of the second current value of described the second calibration branch road of flowing through, wherein, the second electric current of described the second calibration branch road of flowing through is the output current of described instrument for measuring DC resistance.
Preferably, described the first current measurement module comprises: resistance is the first resistance of the first resistance value and first voltage table in parallel with described the first resistance.
Preferably, described the second current measurement module comprises: resistance is the second resistance of the second resistance value and the second voltage table in parallel with described the second resistance.
Via above-mentioned technical scheme as can be known, compared with prior art, the utility model openly provides a kind of instrument for measuring DC resistance calibration system, this obtains the input impedance of instrument for measuring DC resistance pressure feedback port according to the first calibration branch road, and obtain the output current of instrument for measuring DC resistance according to the second calibration branch road, thereby virtually reappear standard resistance in kind.This system utilizes the mode of electric virtual reproduction standard resistance in kind that instrument for measuring DC resistance is calibrated, solved and adopted the mode of multiple spot calibration in the prior art due to the calibration of instrument for measuring DC resistance, simultaneously different instrument for measuring DC resistance electric current output gear, resistance measurement scope difference are larger, standard resistance in kind is single, thereby standard resistance in kind can not cover the problem of instrument for measuring DC resistance resistance measurement scope fully.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
Fig. 1 shows the structural representation of an embodiment of a kind of instrument for measuring DC resistance calibration system of the utility model;
Fig. 2 shows the structural representation of another embodiment of a kind of instrument for measuring DC resistance calibration system of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Referring to Fig. 1, show the structural representation of an embodiment of a kind of instrument for measuring DC resistance calibration system of the utility model, in the present embodiment, this instrument for measuring DC resistance calibration system comprises: instrument for measuring DC resistance 1 to be calibrated, the first calibration branch road that is connected with two pressure feedback ports of described instrument for measuring DC resistance 1 and the second calibration branch road that is connected with two current output terminals of described instrument for measuring DC resistance 1.
Wherein, this first calibration branch road comprises: measure the first calibration branch road of flowing through the first current value the first current measurement module 2 and from the controllable voltage source output module 4 that different magnitudes of voltage are provided of the first current measurement module series connection.
This second calibration branch road comprises: the second current measurement module 3 of measuring the second current value of this second calibration branch road of flowing through.Wherein, the second current value of this second calibration branch road of flowing through is identical with the output current value of this instrument for measuring DC resistance, and therefore, in fact the second current value that can measure of this second direct current measurement module is exactly the actual output current value of this instrument for measuring DC resistance.
Wherein, controllable voltage source output module 4 can outwards be exported different magnitudes of voltage, can set according to actual needs the magnitude of voltage of these controllable voltage source output module 4 outputs.In the present embodiment, this controllable voltage source output module provides feedback voltage to the pressure feedback port of instrument for measuring DC resistance 1.
When utilizing the calibration system of the present embodiment that instrument for measuring DC resistance is calibrated, can control this controllable voltage source the feedback voltage of certain voltage value is provided to the pressure feedback port of this instrument for measuring DC resistance 1, when the pressure feedback port of instrument for measuring DC resistance 1 was added with feedback voltage, the input impedance of supposing instrument for measuring DC resistance 1 pressure feedback port was R
in, by the voltage U of controllable voltage source output module output and the first electric current I of the first current measurement module 2 measurements
1, and utilize Ohm law R=U/I, can calculate the input impedance R of instrument for measuring DC resistance 1 pressure feedback port
in
Be added with feedback voltage by the pressure feedback port at instrument for measuring DC resistance in the present embodiment, and current output terminal can virtually reappear standard resistance in kind when output current is arranged, this standard resistance in kind and the input impedance of instrument for measuring DC resistance be relation in parallel, and setting treats that the resistance value of the standard material object resistance of virtual reproduction is R
N, according to the principle of instrument for measuring DC resistance measuring resistance as can be known, this treats the standard resistance R in kind of virtual reproduction
NConnected mode be equivalent in parallel with the input impedance of instrument for measuring DC resistance pressure feedback port, and be connected in pressure feedback port and the current output terminal of instrument for measuring DC resistance, measure the second current value by the second current measurement module 3, i.e. the output current I of instrument for measuring DC resistance
2, consider the standard for the treatment of virtual reproduction resistance R in kind
NWith the connected mode of instrument for measuring DC resistance, the theoretical feedback voltage U of instrument for measuring DC resistance pressure feedback port
0=I
2* R
N* R
in/ (R
N+ R
in).
If do not consider in the present embodiment the voltage drop on the first current measurement 2 modules, the theoretical feedback voltage U of instrument for measuring DC resistance pressure feedback port
0Equal the theoretical voltage U of controllable voltage source output module 4 outputs
3, the current voltage value of regulation voltage source output module 4 outputs is to the theoretical voltage value, thus virtual reproduction standard resistance in kind, and then Estimate of Resistance for DC Low Resistance Meter is calibrated.
In the above-described embodiment, the first electric current I of measuring by current voltage U and first current measurement module 2 of the output of controllable voltage source output module
1, utilize Ohm law R=U/I to calculate the pressure feedback port input impedance R of instrument for measuring DC resistance 1
in, then the output current I of the instrument for measuring DC resistance 1 of measuring according to the second current measurement module 3
2, the resistance value of setting the standard resistance in kind that need to virtually reappear is R
NCalculate the theoretical voltage value that the controllable voltage source output module should be exported, regulate the voltage of controllable voltage source output module, thereby instrument for measuring DC resistance is calibrated, solved in present technology because the calibration of instrument for measuring DC resistance adopts the mode of multiple spot calibration simultaneously different instrument for measuring DC resistance electric current gear, resistance measurement measurement range difference larger, thereby standard resistance in kind can not cover the problem of instrument for measuring DC resistance resistance measurement scope fully.
Further, in the present embodiment, this system also can comprise: calibration module 5.Referring to Fig. 2, show the connection diagram of the calibration module of a kind of instrument for measuring DC resistance calibration system of the utility model.
This calibration module comprises: acquisition module and computing module.
The parameter of acquisition module collection the first current measurement module, the second current measurement module and the output of controllable voltage source output module also is delivered to computing module, and computing module calculates according to this parameter.
This calibration module also can be divided into by the calibrating mode difference: the first calibration module and the second calibration module.
when calibration module is the first calibration module, this first calibration module and the first current measurement module, the second current measurement module and controllable voltage source output module are connected, this module gathers the first current measurement module, the parameter value of the second current measurement module and controllable voltage source output module, and the resistance value of resistance in kind according to the standard for the treatment of virtual reproduction, calculate the theoretical feedback voltage of instrument for measuring DC resistance pressure feedback port, and then calculate the theoretical voltage that the controllable electric power module should be exported, regulate the current voltage value of controllable electric power module output to the theoretical voltage value, thereby compare with the measured value of Estimate of Resistance for DC Low Resistance with this standard resistance value in kind for the treatment of virtual reproduction, realize the calibration of instrument for measuring DC resistance.
Further, when calibration module was the second calibration module, this calibration module acquisition stream was through the first current value of described the first calibration branch road, flow through the second current value of described the second calibration branch road and the magnitude of voltage of the current output of described voltage source output module.with reference to Ohm law, and according to the magnitude of voltage of described the first current value and the current output of described voltage source output module, calculate the input impedance value of described instrument for measuring DC resistance pressure feedback port, in conjunction with this input impedance value, the current voltage of the second current value and the output of controllable voltage source output module, according to the in parallel relation of the standard material object resistance for the treatment of virtual reproduction with input impedance, utilize Ohm law, calculate the resistance value of the standard resistance in kind of this virtual reproduction, and then compare with the measured value of direct current resistance measurer, realize the calibration of instrument for measuring DC resistance.
In the utility model, this first current measurement module can only comprise a reometer, also can comprise a voltage table and the resistance that resistance value is known.
Accordingly, this second current measurement module can only comprise a reometer, also can comprise a voltage table and the resistance that resistance value is known.
In the application of reality, in order to calibrate more exactly instrument for measuring DC resistance, referring to Fig. 2, show the structural representation of another embodiment of a kind of instrument for measuring DC resistance calibration system of the utility model, be with embodiment calibration system difference shown in Figure 1:
In the present embodiment, the first current measurement module 2 comprises: resistance is the first resistance 21 and first voltage table 22 in parallel with this first resistance of the first resistance value.The first resistance value of this first resistance is a known fixed value, and this first resistance setting value is R1 in the present embodiment.
The internal resistance of this first voltage table 22 is enough large, thereby disregards the electric current of first voltage table 22 of flowing through.This first voltage table 22 is used for measuring these the first resistance 21 added voltage U in two ends
1Thereby, according to Ohm law obtain flowing through the first current value I of the first calibration branch road
1, and then first resistance R known according to resistance value
1, flow through first the calibration branch road the first current value I
1And the voltage U of controllable voltage source output module output, utilize Ohm law to calculate the input impedance R of instrument for measuring DC resistance pressure feedback port
in
Further in the present embodiment, the second current measurement module 3 comprises: the second resistance 31 setting values with second resistance value are R
2And the second voltage table 32 in parallel with this resistance, the resistance value of this second resistance is a known fixed value.Wherein this first resistance value and the second resistance value are only in order to distinguish the resistance of the first resistance value and the second resistance, whether the resistance that does not limit two resistance is identical, when actual selection the first resistance and the second resistance, the resistance of the resistance of this first resistance and the second resistance can be the same or different.
This second resistance setting value is R in the present embodiment
2, when choosing this second resistance, can choose the resistance of corresponding rated current as the second resistance according to the size according to the rated current of instrument for measuring DC resistance to be calibrated.
The internal resistance of this second voltage table 32 is enough large, thereby disregards the electric current of the second voltage table 32 of flowing through.This second voltage table 32 is used for measuring above-mentioned the second resistance 31 added voltage U in two ends
2Thereby, according to Ohm law obtain flowing through the second current value I of the second calibration branch road
2, i.e. the output current value of instrument for measuring DC resistance to be calibrated.
When the pressure feedback port of instrument for measuring DC resistance is added with feedback voltage, can virtually reappears standard resistance in kind when current output terminal has output current, the standard of this virtual reproduction resistance in kind is in parallel with the input impedance of instrument for measuring DC resistance, and setting the standard for the treatment of virtual reproduction resistance in kind is R
N, according to the principle of instrument for measuring DC resistance measuring resistance as can be known, this treats the standard resistance R in kind of virtual reproduction
NConnected mode be equivalent in parallel with the input impedance of instrument for measuring DC resistance pressure feedback port, and be connected in pressure feedback port and the current output terminal of instrument for measuring DC resistance, utilize the second resistance 31 and second voltage table 32 to measure the second current value, i.e. the output current I of instrument for measuring DC resistance
2, consider the standard for the treatment of virtual reproduction resistance R in kind
NWith the connected mode of instrument for measuring DC resistance, the theoretical feedback voltage U of instrument for measuring DC resistance pressure feedback port
0=I
2* R
N* R
in/ (R
N+ R
in), due to the input impedance R of the first resistance 21, instrument for measuring DC resistance pressure feedback port
inAnd the voltage U of controllable electric power output module output is the mode of series connection, the controllable electric power output module theoretical voltage U that should export
3=U
0* (R
in+ R
1)/R
in, regulate the magnitude of voltage of the current output of controllable electric power output module to the theoretical voltage value, standard resistance in kind that can virtual reproduction, thus instrument for measuring DC resistance is calibrated.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from spirit or scope of the present utility model, realization in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (3)
1. an instrument for measuring DC resistance calibration system, is characterized in that, comprising: instrument for measuring DC resistance to be calibrated, the first calibration branch road and the second calibration branch road;
Wherein, two exits of described the first calibration branch road are connected with two pressure feedback ports of described instrument for measuring DC resistance respectively;
Two exits of described the second calibration branch road are connected with two current output terminals of described instrument for measuring DC resistance respectively;
Described the first calibration branch road comprises: measure first current measurement module of the first current value of described the first calibration branch road of flowing through and the voltage source output module of connecting with described the first current measurement module, wherein said voltage source output module can provide the output voltage of different magnitudes of voltage;
Described the second calibration branch road comprises: measure the second current measurement module of the second current value of described the second calibration branch road of flowing through, wherein, the second electric current of described the second calibration branch road of flowing through is the output current of described instrument for measuring DC resistance.
2. system according to claim 1, is characterized in that, described the first current measurement module comprises: resistance is the first resistance of the first resistance value and first voltage table in parallel with described the first resistance.
3. system according to claim 2, is characterized in that, described the second current measurement module comprises: resistance is the second resistance of the second resistance value and the second voltage table in parallel with described the second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629798 CN203275627U (en) | 2012-11-23 | 2012-11-23 | DC resistance tester calibration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629798 CN203275627U (en) | 2012-11-23 | 2012-11-23 | DC resistance tester calibration system |
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| Publication Number | Publication Date |
|---|---|
| CN203275627U true CN203275627U (en) | 2013-11-06 |
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|---|---|---|---|
| CN 201220629798 Expired - Fee Related CN203275627U (en) | 2012-11-23 | 2012-11-23 | DC resistance tester calibration system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998644A (en) * | 2012-11-23 | 2013-03-27 | 浙江省电力公司电力科学研究院 | Calibration system for direct current resistance tester |
| CN104977557A (en) * | 2015-07-08 | 2015-10-14 | 南车青岛四方机车车辆股份有限公司 | Device and method for calibrating contact resistance tester |
| CN109031176A (en) * | 2018-07-05 | 2018-12-18 | 中国人民解放军91388部队 | A kind of Multifunction electricity source measurement standard method |
| TWI729631B (en) * | 2019-12-18 | 2021-06-01 | 致茂電子股份有限公司 | Method for measuring impedance |
-
2012
- 2012-11-23 CN CN 201220629798 patent/CN203275627U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998644A (en) * | 2012-11-23 | 2013-03-27 | 浙江省电力公司电力科学研究院 | Calibration system for direct current resistance tester |
| CN104977557A (en) * | 2015-07-08 | 2015-10-14 | 南车青岛四方机车车辆股份有限公司 | Device and method for calibrating contact resistance tester |
| CN109031176A (en) * | 2018-07-05 | 2018-12-18 | 中国人民解放军91388部队 | A kind of Multifunction electricity source measurement standard method |
| TWI729631B (en) * | 2019-12-18 | 2021-06-01 | 致茂電子股份有限公司 | Method for measuring impedance |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20201123 |