CN102998644B - Calibration system for direct current resistance tester - Google Patents
Calibration system for direct current resistance tester Download PDFInfo
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Abstract
The invention discloses a calibration system for a direct current resistance tester. According to the system, a mode is used for electrically and virtually reproducing standard object resistance, input impedance of a voltage feedback end of a direct current resistance tester is obtained according to a first calibration branch circuit, and output current of the direct current resistance tester is obtained according to a second calibration branch circuit, so that the standard object resistance is virtually reproduced. According to the system, the mode is used for electrically and virtually reproducing the standard object resistance so as to calibrate the direct current resistance tester, so that the problem that standard object resistance values can not completely cover a resistance measurement range of the direct current resistance tester due to the fact that in prior art, multipoint calibration methods are used for calibrating the direct current resistance tester, simultaneously, differences of current output gears and current measurement ranges of different direct current resistance testers are large, and standard object resistance values are single is solved.
Description
Technical field
The present invention relates to electrical instrumentation calibration technology, relate 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, in engineering test, is widely used.
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, 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.
Before application instrument for measuring DC resistance measured resistance value, must calibrate it, 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, to determine that whether the measured value of this instrument for measuring DC resistance is accurate, realize alignment purpose.Yet, because different instrument for measuring DC resistance electric current output gear, resistance measurement scope difference are larger, during calibration, need to examine the resistance measurement performance of the different electric current gears of this instrument for measuring DC resistance, for each electric current gear, carry out again multiple spot calibration.At standard resistance in kind, be equipped with, just need to produce in advance a plurality of rated current, the standard resistance in kind of a plurality of different resistance values.For example, by school instrument for measuring DC resistance 1mA current gear resistance measurement scope, be 200 Ω～20k Ω, 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 and be difficult in this way reach the covering completely of different resistance meters being measured to range, thereby increased complexity and the difficulty of calibration operation.
Summary of the invention
In view of this, the invention provides a kind of instrument for measuring DC resistance calibration system, to reduce calibration difficulty and the complexity of instrument for measuring DC resistance, improve the convenience of calibration.
For achieving the above object, the invention provides following technical scheme:
An instrument for measuring DC resistance calibration system, 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.
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.
Preferably, described system also comprises: the first calibration module;
Described the first calibration module is connected with described voltage source output module, described the first current measurement module and described the second current measurement module;
Described the first calibration module acquisition stream is 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 controlling 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;
Described the first calibration module is according to the current resistance value for the treatment of the standard resistance in kind of virtual reproduction, and in conjunction with described input impedance value and the second current value, relation in parallel according to the standard for the treatment of virtual reproduction resistance in kind with input impedance, utilize Ohm law, calculate described voltage source output module magnitude of voltage to be exported, and control magnitude of voltage to be exported described in the output of described voltage source output module.
Preferably, described system also comprises: the second calibration module;
Described the second calibration module is connected with described voltage source output module, described the first current measurement module and described the second school current measurement module;
Described the second calibration module acquisition stream is 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 controlling 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; Magnitude of voltage, described input impedance value and described the second current value in conjunction with described voltage source output module output, relation in parallel according to the standard for the treatment of virtual reproduction resistance in kind with input impedance, utilize Ohm law, calculate the resistance value of the standard resistance in kind of virtual reproduction.
Preferably, described calibration module comprises: parameter acquisition module and the computing module being connected with described parameter acquisition module;
Described parameter acquisition module gathers the second current value of the output voltage values of described voltage source output module, the first current value of described the first current measurement module output and described the second current measurement module output, and the described parameter collecting is sent to described computing module;
Described computing module is in receiving the parameter of described parameter acquisition module transmission and calculating according to described parameter.
Preferably, described calibration module is connected with printing device;
Described printing device receives the result of calculation of described calibration module output, and result of calculation described in printout.
Known via above-mentioned technical scheme, compared with prior art, the present invention openly provides a kind of instrument for measuring DC resistance calibration system, this system adopts electric virtual reproduction standard resistance mode in kind, according to the first calibration branch road, obtain the input impedance of instrument for measuring DC resistance pressure feedback port, and according to the second calibration branch road, obtain the output current of instrument for measuring DC resistance, thereby virtually reappear standard resistance in kind.This system utilizes the mode of electric virtual reproduction standard resistance in kind to calibrate instrument for measuring DC resistance, solved the mode of calibrating due to the calibration employing multiple spot of instrument for measuring DC resistance in prior art, 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 completely.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 shows the structural representation of an embodiment of a kind of instrument for measuring DC resistance calibration system of the present invention;
Fig. 2 shows the connection diagram of the calibration module of a kind of instrument for measuring DC resistance calibration system of the present invention;
Fig. 3 shows the structural representation of another embodiment of a kind of instrument for measuring DC resistance calibration system of the present invention;
Fig. 4 shows the circulating working mode process flow diagram of a kind of instrument for measuring DC resistance calibration system of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, show the structural representation of an embodiment of a kind of instrument for measuring DC resistance calibration system of the present invention, 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 being 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, the second current value that in fact this second direct current measurement module can be measured 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.
While utilizing the calibration system of the present embodiment to calibrate instrument for measuring DC resistance, 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 is added with feedback voltage, the input impedance of supposing instrument for measuring DC resistance 1 pressure feedback port is R
in, the first electric current I that the voltage U of exporting by controllable voltage source output module and the first current measurement module 2 are measured
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.
By the pressure feedback port at instrument for measuring DC resistance, be added with feedback voltage in the present embodiment, and current output terminal can virtually reappear standard resistance in kind while having output current, this standard resistance in kind and the input impedance of instrument for measuring DC resistance are relation in parallel, and the resistance value of setting the standard material object resistance for the treatment of virtual reproduction is R
n, known according to the principle of instrument for measuring DC resistance measuring resistance, 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, by the second current measurement module 3, measure the second current value, i.e. the output current I of instrument for measuring DC resistance
2, consider the standard resistance R in kind for the treatment of virtual reproduction
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 in 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 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 that the current voltage U exporting by controllable voltage source output module and the first current measurement module 2 are measured
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 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 instrument for measuring DC resistance electric current gear, resistance measurement measurement range difference that mode that calibration due to instrument for measuring DC resistance adopts multiple spot calibration is simultaneously different larger, thereby standard resistance in kind can not cover the problem of instrument for measuring DC resistance resistance measurement scope completely.
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 present invention.
This calibration module comprises: acquisition module and computing module.
Acquisition module gathers the parameter of the first current measurement module, the second current measurement module and the output of controllable voltage source output module and is delivered to computing module, and computing module calculates according to this parameter.
This calibration module also can be divided into by 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 according to the resistance value for the treatment of the standard resistance in kind of virtual reproduction, calculate the theoretical feedback voltage of instrument for measuring DC resistance pressure feedback port, and then calculate the theoretical voltage that controllable electric power module should be exported, regulate the current voltage value of controllable electric power module output to theoretical voltage value, thereby compare with the measured value of Estimate of Resistance for DC Low Resistance by the standard resistance value in kind that this treats virtual reproduction, realize the calibration of instrument for measuring DC resistance.
Further, when calibration module is the second calibration module, this calibration module acquisition stream is through the first current value of described the first calibration branch road, described the second calibration the second current value of branch road and the magnitude of voltage of the current output of described voltage source output module of flowing through.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, relation in parallel according to the standard for the treatment of virtual reproduction resistance in kind 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 present invention, 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 actual application, in order to calibrate more exactly instrument for measuring DC resistance, referring to Fig. 3, show the structural representation of another embodiment of a kind of instrument for measuring DC resistance calibration system of the present invention, be with the embodiment calibration system difference shown in Fig. 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 for measuring this 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 according to the first known resistance R of resistance value
1, the first calibration branch road of flowing through 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: second resistance 31 setting values with the 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 used 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, while choosing this second resistance, can be according to the resistance of choosing corresponding rated current according to the size of the rated current of instrument for measuring DC resistance to be calibrated as the second resistance.
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 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 being added with feedback voltage, current output terminal, the pressure feedback port of instrument for measuring DC resistance while having output current, can virtually reappear standard resistance in kind, the standard resistance in kind of this virtual reproduction is in parallel with the input impedance of instrument for measuring DC resistance, sets and treats that the standard resistance in kind of virtual reproduction is R
n, known according to the principle of instrument for measuring DC resistance measuring resistance, 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 resistance R in kind for the treatment of virtual reproduction
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 mode of the voltage U of controllable electric power output module output for connecting, the theoretical voltage U that controllable electric power output module should be exported
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 theoretical voltage value, standard resistance in kind that can virtual reproduction, thus instrument for measuring DC resistance is calibrated.
Further, in the present embodiment, this system yet can comprise: in calibration module 5(Fig. 3, do not draw).
This calibration module comprises: acquisition module and computing module.
Acquisition module gathers the parameter of the first current measurement module, the second current measurement module and the output of controllable voltage source output module and is delivered to computing module, and computing module calculates according to this parameter.
This calibration module can be divided into according to calibrating mode difference: two kinds of the first calibration module and the second calibration modules.
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 according to the resistance value of the standard for the treatment of virtual reproduction resistance in kind, calculate the theoretical feedback voltage of instrument for measuring DC resistance pressure feedback port, and then calculate the theoretical voltage that controllable electric power module should be exported, regulate the current voltage value of controllable electric power module output to theoretical voltage value, thereby compare with the measured value of Estimate of Resistance for DC Low Resistance by the standard resistance value in kind that this treats virtual reproduction, realize the calibration of instrument for measuring DC resistance.
Further, when calibration module is the second calibration module, this calibration module acquisition stream is through the first current value of described the first calibration branch road, described the second calibration the second current value of branch road and the magnitude of voltage of the current output of described voltage source output module of flowing through.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, relation in parallel according to the standard for the treatment of virtual reproduction resistance in kind 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.
Further, in order to make calibration personnel more accurately understand calibration process, this first calibration module can also be connected with printing device with this second calibration module, and this printing device receives the result of calculation of calibration module output, and calibration result described in printout.
In any one embodiment of the present invention, this calibration module can be built in arbitrarily in opertaing device, as being a PC, this calibration module is connected with the second current measurement module piece with the first current measurement module by USB interface, carries out collection and the calculating of data.
In addition, because the calibration of instrument for measuring DC resistance needs dynamically to follow the tracks of its average anode current, thereby be provided with circulating working mode in the process of calibration, referring to Fig. 4, show the circulating working mode process flow diagram of a kind of instrument for measuring DC resistance calibration system of the present invention.
After calibration starts, the first calibration branch road is measured by the input impedance of school instrument for measuring DC resistance pressure feedback port, and then second calibration branch road measure by the output current of school instrument for measuring DC resistance, according to the parameter of gained and the resistance value for the treatment of the standard resistance in kind of virtual reproduction, calculate the theoretical voltage value that controllable voltage source module should be exported, regulate the current voltage value of the fast output of controllable voltage source mould to theoretical voltage value, whether judgement calibration afterwards finishes, if, calibration finishes, otherwise enter circulating working mode, continue to measure by the output current of school instrument for measuring DC resistance.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention 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 (5)
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;
Described system also comprises: the first calibration module or the second calibration module;
Described the first calibration module is connected with described voltage source output module, described the first current measurement module and described the second current measurement module;
Described the first calibration module acquisition stream is 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 controlling 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;
Described the first calibration module is according to the current resistance value for the treatment of the standard resistance in kind of virtual reproduction, and in conjunction with described input impedance value and the second current value, relation in parallel according to the standard for the treatment of virtual reproduction resistance in kind with input impedance, utilize Ohm law, calculate described voltage source output module magnitude of voltage to be exported, and control magnitude of voltage to be exported described in the output of described voltage source output module;
Described the second calibration module is connected with described voltage source output module, described the first current measurement module and described the second current measurement module;
Described the second calibration module acquisition stream is 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 controlling 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; Magnitude of voltage, described input impedance value and described the second current value in conjunction with described voltage source output module output, relation in parallel according to the standard for the treatment of virtual reproduction resistance in kind with input impedance, utilize Ohm law, calculate the resistance value of the standard resistance in kind of virtual reproduction.
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.
4. system according to claim 1, is characterized in that, described calibration module comprises: parameter acquisition module and the computing module being connected with described parameter acquisition module;
Described parameter acquisition module gathers the second current value of the output voltage values of described voltage source output module, the first current value of described the first current measurement module output and described the second current measurement module output, and the described parameter collecting is sent to described computing module;
Described computing module is in receiving the parameter of described parameter acquisition module transmission and calculating according to described parameter.
5. system according to claim 1, is characterized in that, described calibration module is connected with printing device;
Described printing device receives the result of calculation of described calibration module output, and result of calculation described in printout.
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| CN201210485507.1A CN102998644B (en) | 2012-11-23 | 2012-11-23 | Calibration system for direct current resistance tester |
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|---|---|---|---|
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| CN202075403U (en) * | 2011-05-26 | 2011-12-14 | 福建省计量科学研究院 | Calibrating device of grounded on-resistance tester |
| CN102298132A (en) * | 2011-05-26 | 2011-12-28 | 福建省计量科学研究院 | Calibrating device of grounding conduction resistance tester |
| CN203275627U (en) * | 2012-11-23 | 2013-11-06 | 浙江省电力公司电力科学研究院 | DC resistance tester calibration system |
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2012
- 2012-11-23 CN CN201210485507.1A patent/CN102998644B/en active Active
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