CN102998644A - Calibration system for direct current resistance tester - Google Patents
Calibration system for direct current resistance tester Download PDFInfo
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- CN102998644A CN102998644A CN2012104855071A CN201210485507A CN102998644A CN 102998644 A CN102998644 A CN 102998644A CN 2012104855071 A CN2012104855071 A CN 2012104855071A CN 201210485507 A CN201210485507 A CN 201210485507A CN 102998644 A CN102998644 A CN 102998644A
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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 the 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, 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 the 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.
Before using the 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, in order to determine 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 currents is exported gear, resistance measurement scope difference is 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 gears, 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 fully covering of different resistance meters being measured 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:
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 link to each other with two pressure feedback ports of described instrument for measuring DC resistance respectively;
Two exits of described the second calibration branch road link to each other 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 links to each other 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 calculate the input impedance value of described instrument for measuring DC resistance pressure feedback port according to the magnitude of voltage of described the first current value and the current output of described voltage source output module;
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, according to the in parallel relation of 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 described voltage source output module output magnitude of voltage described to be exported.
Preferably, described system also comprises: the second calibration module;
Described the second calibration module links to each other 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 calculate the input impedance value of described instrument for measuring DC resistance pressure feedback port according to the magnitude of voltage of described the first current value and the current output of described voltage source output module; Magnitude of voltage, described input impedance value and described the second current value in conjunction with described voltage source output module output, according to the in parallel relation of 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 that links to each other with described parameter acquisition module;
Described parameter acquisition module gathers the first current value of the output voltage values of described voltage source output module, the output of described the first current measurement module and the second current value of described the second current measurement module output, and the described parameter that will collect is sent to described computing module;
Described computing module calculates in the parameter that receives described parameter acquisition module transmission and according to described parameter.
Preferably, described calibration module links to each other with printing device;
Described printing device receives the result of calculation of described calibration module output, and the described result of calculation of printout.
Via above-mentioned technical scheme as can be known, 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, obtain 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 in the prior art because the mode of multiple spot calibration is adopted in 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 embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiments of the invention, 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 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 invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
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 that links to each other with two pressure feedback ports of described instrument for measuring DC resistance 1 and link to each other with two current output terminals of described instrument for measuring DC resistance 1 and second to calibrate branch road.
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 present embodiment that instrument for measuring DC resistance is calibrated, can control this controllable voltage source provides the feedback voltage of certain voltage value 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 then 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 then
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 output is to the theoretical voltage value, thus virtual reproduction standard material object resistance, and then Estimate of Resistance for DC Low Resistance Meter 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, the output current I of the instrument for measuring DC resistance 1 of measuring according to the second current measurement module 3 again
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 the 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 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 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 link to each other, 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 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, current voltage in conjunction with this input impedance value, the second current value and the output of controllable voltage source output module, according to the in parallel relation of 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 the application of reality, 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 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 this added voltage U in the first resistance 21 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, 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 only are 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 the added voltage U in above-mentioned the second resistance 31 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, then 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 then
0=I
2* R
N* R
In/ (R
N+ R
In), because 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, then 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 then can virtual reproduction, thus instrument for measuring DC resistance is calibrated.
Further, in the present embodiment, this system yet can comprise: do not draw among calibration module 5(Fig. 3).
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 the 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 link to each other, this module gathers the first current measurement module, the parameter value of the second current measurement module and controllable voltage source output module, and calculate the theoretical feedback voltage of instrument for measuring DC resistance pressure feedback port according to the resistance value of the standard for the treatment of virtual reproduction resistance in kind, 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 is the second calibration module, this 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 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, current voltage in conjunction with this input impedance value, the second current value and the output of controllable voltage source output module, according to the in parallel relation of 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, more accurately understand calibration process in order to make calibration personnel, this first calibration module can also link to each other with printing device with this second calibration module, and this printing device receives the result of calculation of calibration module output, and the described calibration result of printout.
Among any one embodiment of the present invention, this calibration module can be built in arbitrarily in the opertaing device, as being a PC, this calibration module links to each other with the second current measurement module piece with the first current measurement module by USB interface, carries out data acquisition and calculating.
In addition, because the calibration of instrument for measuring DC resistance needs dynamically to follow the tracks of its average anode current, thereby in the process of calibration, be provided with circulating working mode, 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 alignment leakage resistance tester pressure feedback port, and then second the calibration branch road measure by the output current of alignment leakage resistance tester, according to the parameter of gained and the resistance value of the standard for the treatment of virtual reproduction resistance in kind, calculate the theoretical voltage value that the controllable voltage source module should be exported, regulate the current voltage value of the fast output of controllable voltage source mould to the theoretical voltage value, judge afterwards whether calibration finishes, if, then calibration finishes, otherwise enter circulating working mode, continue to measure by the output current of alignment leakage resistance tester.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away 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 (7)
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 link to each other with two pressure feedback ports of described instrument for measuring DC resistance respectively;
Two exits of described the second calibration branch road link to each other 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.
4. system according to claim 1 is characterized in that, described system also comprises: the first calibration module;
Described the first calibration module links to each other 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 calculate the input impedance value of described instrument for measuring DC resistance pressure feedback port according to the magnitude of voltage of described the first current value and the current output of described voltage source output module;
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, according to the in parallel relation of 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 described voltage source output module output magnitude of voltage described to be exported.
5. system according to claim 1 is characterized in that, described system also comprises: the second calibration module;
Described the second calibration module links to each other 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 calculate the input impedance value of described instrument for measuring DC resistance pressure feedback port according to the magnitude of voltage of described the first current value and the current output of described voltage source output module; Magnitude of voltage, described input impedance value and described the second current value in conjunction with described voltage source output module output, according to the in parallel relation of 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.
6. according to claim 4 or 5 described systems, it is characterized in that described calibration module comprises: parameter acquisition module and the computing module that links to each other with described parameter acquisition module;
Described parameter acquisition module gathers the first current value of the output voltage values of described voltage source output module, the output of described the first current measurement module and the second current value of described the second current measurement module output, and the described parameter that will collect is sent to described computing module;
Described computing module calculates in the parameter that receives described parameter acquisition module transmission and according to described parameter.
7. according to claim 4 or 5 described systems, it is characterized in that described calibration module links to each other with printing device;
Described printing device receives the result of calculation of described calibration module output, and the described result of calculation of printout.
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