CN109581260A - Earth-continuity tester calibration standard resistance system - Google Patents
Earth-continuity tester calibration standard resistance system Download PDFInfo
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- CN109581260A CN109581260A CN201811484430.XA CN201811484430A CN109581260A CN 109581260 A CN109581260 A CN 109581260A CN 201811484430 A CN201811484430 A CN 201811484430A CN 109581260 A CN109581260 A CN 109581260A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The present invention relates to a kind of earth-continuity tester calibration standard resistance systems, including multiple measuring resistances, each measuring resistance includes four terminals, respectively current terminal C1, current terminal C2, current potential terminal P1 and current potential terminal P2, the current potential terminal series-shunt of all measuring resistances connects, the current terminal of all measuring resistances is connected in series, current potential terminal P1 one P1 relay of connection of each measuring resistance, current potential terminal P2 one P2 relay of connection of each measuring resistance, current terminal C1 one C1 relay of connection of each measuring resistance, current terminal C2 one C2 relay of connection of each measuring resistance.Using the measuring resistance system of multiple material standard resistance composition calibration, the measuring resistance quantity and resistance value for participating in calibration are controlled by relay, calibration detection is carried out to earth-continuity tester using material standard resistance, the intelligent combination of resistance and relay control in kind, flexibly and easily.
Description
Technical field:
The invention belongs to earth-continuity tester testing calibration technical fields, and in particular to a kind of Earth-continuity test
Instrument calibration standard resistance system.
Background technique:
Earth-continuity tester is electrical equipment (such as household electrical appliance, electronic electric heater for measuring AC network power supply
Tool, medical electrical equipment and measurement, control and use for laboratory electrical equipment etc.) accessible metal shell and equipment extraction
The instrument of conducting resistance between safety ground end (line).By exporting AC or DC electric current, it is applied to touching for tested body
And between metal shell and the safety ground end (line) of equipment extraction, and measures electric current and flows through pressure drop caused by measured body,
Then the Earth-continuity value of tested body is obtained by the ratio between voltage and current.It is mainly by current source, voltage measurement, defeated
The part such as electric current setting or conciliation, sound-light alarm, instruction device forms out.
For the reliability for ensureing earth-continuity tester, national magnitude tracing system requirements tester operating resistance is surveyed
Amount accuracy index of correlation meets the requirement of JJG984-2004 " earth-continuity tester " vertification regulation.
When being calibrated to earth-continuity tester, measuring resistance is usually set, Earth-continuity is utilized
The resistance value of tester testing standard resistance determines that Earth-continuity is tested using standard amperemeters test job current value
Whether the measuring accuracy of instrument is qualified.There are two types of types for earth-continuity tester on the market, and one is tool, there are four wiring
Terminal can calibrate it using four termination collimation methods.Another only there are two connecting terminals, i.e., close current terminal potential end
And be a measurement end, such earth-continuity tester can only calibrate it using both ends connection.
Currently, common measuring resistance has artifical resistance device, driver plate when calibrating to earth-continuity tester
Formula measuring resistance, push button measuring resistance and individual measuring resistance.
Artifical resistance device is actually to be made of current converter circuit and program-controlled bleeder circuit.Checking procedure is exactly with ground connection
The measurement process for the four port network resistance that the measurement of conducting resistance measuring instrument is made of current converter circuit and program-controlled bleeder circuit.
Tester electric current I is converted into corresponding voltage Ui by current converter, it is assumed that conversion coefficient K1, then Ui=I* K1Voltage UiThrough
It crosses controllable divider to be divided or amplified, show that voltage Uo returns to the voltage tester end of earth-continuity tester,
It is K that it, which divides coefficient,2, then Uo=K2UiThe resistance R that the operation of final test instrument measures are as follows: R=K1* K2, change programmable control voltage divider
Ratio K2, so that it may the resistance value artifical resistance device calibrating installation of continuous variable is simulated so that small in size, rated current is big, essence
Degree is high, resistance adjustment is flexibly advantage.But such standard has the shortcomings that comparison is significant, one, must with four termination collimation methods calibrating.
Two, since null offset, gain drift, non-linear etc. influence, the stability influence of resistance value is larger.Three, since principle limits, no
Earth-continuity tester only there are two connecting terminal can be calibrated.
Dial-type measuring resistance is to change the size of resistance by the rotation of each mechanical disk, and manual rotation's machinery is needed to turn
Disk.Push button measuring resistance is to select to participate in work by manual pushbutton by connecting a button switch to each measuring resistance
The resistance value and quantity of the measuring resistance of work.Every resistance of individual measuring resistance externally only provides a resistance value, every to change one
Secondary resistance value will do installation again wiring.It is low all to there is the degree of automation in above-mentioned three kinds of measuring resistances, cumbersome, takes a lot of work
It is time-consuming, the defects of calibration efficiency is low.
Summary of the invention:
In conclusion the present invention provides a kind of earth-continuity tester schools in order to overcome the shortcomings of prior art problem
Mutatis mutandis measuring resistance system, it is to pass through relay using the measuring resistance system of multiple material standard resistance composition calibration
Control participate in calibration measuring resistance number combinations and resistance value, using material standard resistance to earth-continuity tester into
Flexibly and easily four termination collimation methods had not only can be used but also can in row calibration detection, the intelligent combination of resistance and relay in kind control
To be applicable in both ends connection, versatile, precision and high reliablity.
In order to solve the above technical problems, the technical scheme of the present invention is realized as follows:
A kind of earth-continuity tester calibration standard resistance system, in which: the measuring resistance system includes multiple
Measuring resistance, each measuring resistance include four connecting terminals, respectively current terminal C1, current terminal C2, current potential terminal P1
And current potential terminal P2, the current potential terminal series-shunt connection of all measuring resistances, the current terminal of all measuring resistances, which is connected, to be connected
It connects, composition measuring resistance row, the current potential terminal P1 of each measuring resistance is electrically connected by a P1 relay with P1 bus
It connects, the current potential terminal P2 of each measuring resistance is electrically connected by a P2 relay with P2 bus, the electric current of each measuring resistance
Terminal C1 is electrically connected by a C1 relay with C1 bus, and the current terminal C2 of each measuring resistance passes through a C2 relay
It is electrically connected with C2 bus.
Technical solution of the present invention may also is that realization: the measuring resistance system includes multiple 1m Ω standards
Resistance, multiple 10m Ω measuring resistances and multiple 100m Ω measuring resistances, multiple 1m Ω measuring resistances, multiple 10m Ω measuring resistances
And multiple 100m Ω measuring resistances are connected in series, composition measuring resistance row, and when series connection, multiple 10m Ω standard electrics of first connecting
Resistance, then multiple 1m Ω measuring resistances of connecting, multiple 100m Ω measuring resistances of finally connecting, each 10m Ω measuring resistance front end are equal
A piece lead-out wire is set, which connect after connecting with a P1 relay with P1 bus or the lead-out wire and a C1
It is connect after relay connection with C1 bus；Lead-out wire is set between adjacent 10m Ω measuring resistance and 1m Ω measuring resistance, is drawn
Line is connect after connecting with a P1 relay with P1 bus or lead-out wire connect with a C1 relay after with C1 bus connect
It connects；Two lead-out wires are set between two adjacent 1m Ω measuring resistances, wherein a lead-out wire is connect with a P1 relay
It is connect afterwards with P1 bus, another lead-out wire is connect after connecting with a P2 relay with P2 bus, or a wherein extraction
Line is connect after connecting with a C1 relay with C1 bus, and another lead-out wire connects after connecting with a C2 relay with C2 bus
It connects；A piece lead-out wire, the lead-out wire and a P2 relay are set between adjacent 1m Ω measuring resistance and 100m Ω measuring resistance
Device connection after connect with P2 bus or the lead-out wire connect with a C2 relay after connect with C2 bus；Each 100m Ω
A lead-out wire is arranged in the rear end of measuring resistance, which connect after connecting with a P2 relay with P2 bus, or should
Lead-out wire is connect after connecting with a C2 relay with C2 bus.
Technical solution of the present invention may also is that realization: the measuring resistance system includes 10 1m Ω standards
Resistance, 10 10m Ω measuring resistances and 10 100m Ω measuring resistances.
The invention has the benefit that
1, the present invention is controlled and is participated in by relay using the measuring resistance system of multiple material standard resistance composition calibration
The measuring resistance number combinations and resistance value of calibration carry out calibration inspection to earth-continuity tester using material standard resistance
It surveys, the intelligent combination of resistance and relay control in kind flexibly and easily, not only can be used four termination collimation methods but also can be applicable in two
Terminate collimation method, versatile, precision and high reliablity.
2, measuring resistance system of the invention uses concatenated material standard resistance, and is controlled by relay, Neng Goushi
The intelligent combination of real object resistance and relay control, flexibly and easily, reduces corresponding manual operation and mechanical structure, improves
The reliability of measurement and calibration efficiency and system, and possibility is provided for long-range control.Compared with traditional driver plate resistor,
Calibration resistor class of accuracy having the same and higher reliability.
Detailed description of the invention:
Fig. 1 is the circuit theory schematic diagram of earth-continuity tester calibration system；
Fig. 2 is the circuit theory schematic diagram of the master control system of earth-continuity tester calibration system；
Fig. 3 is the circuit diagram of the master control system of earth-continuity tester calibration system；
Fig. 4 is measuring resistance system and C1 relay group and C2 relay group attachment structure schematic diagram；
Fig. 5 is measuring resistance system and P1 relay group and P2 relay group attachment structure schematic diagram；
Fig. 6 is the P1 relay group control module of earth-continuity tester calibration system, P2 relay group control module
Circuit diagram；
Fig. 7 is the C1 relay group control module of earth-continuity tester calibration system, C2 relay group control module
Circuit diagram；
Fig. 8 is the current acquisition system circuit theory schematic diagram of earth-continuity tester calibration system；
Fig. 9 is the circuit diagram of the current acquisition system of earth-continuity tester calibration system；
Figure 10 is the System of voltage acquisition circuit theory schematic diagram of earth-continuity tester calibration system；
Figure 11 is the circuit diagram of the System of voltage acquisition of earth-continuity tester calibration system；
Figure 12 is another structural schematic diagram of measuring resistance system；
Figure 13 is four termination collimation method wiring schematic diagrams of earth-continuity tester calibration system；
Figure 14 is the both ends connection wiring schematic diagram of earth-continuity tester calibration system.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
Embodiment one
As shown in Figure 1, a kind of earth-continuity tester calibration system, including 1, four connecting terminal of shell and setting are outside
Measuring resistance system 6, current acquisition system 3, System of voltage acquisition 4, C1 relay group 14, C2 relay group 7, P1 in shell 1
Relay group 15, P2 relay group 8, voltage acquisition relay group 11, current sample selective relay group 5 and master control system 2,
There are four connecting terminal, respectively C1 terminals, C2 terminals, P1 terminals and P2 terminals, marks for setting on the shell 1
Quasi- resistance system 6 is electrically connected by C1 relay group 14 with C1 bus 13, the C1 terminals on 13 connected with outer casing 1 of C1 bus, mark
Quasi- resistance system 6 is electrically connected by C2 relay group 7 with C2 bus 9, and C2 bus 9 is connect with the C2 terminals on shell 1, standard
Resistance system 6 is electrically connected by P1 relay group 15 with P1 bus 12, and P1 bus 12 is connect with the P1 terminals on shell 1, mark
Quasi- resistance system 6 is electrically connected by P2 relay group 8 with P2 bus 10, and P2 bus 10 is connect with the P2 terminals on shell 1, mark
Quasi- resistance system 6 is electrically connected by current acquisition selective relay group with current acquisition system 3, and current acquisition system 3 is electrically connected
Master control system 2, the C1 terminals are electrically connected with C2 terminals by voltage acquisition relay group 11, and the voltage is adopted
Collection relay group 11 is electrically connected with System of voltage acquisition 4, and System of voltage acquisition 4 is electrically connected master control system 2, C1 relay group
14, C2 relay group 7, P1 relay group 15, P2 relay group 8 are electrically connected by control line with master control system 2 respectively.
As shown in Figures 2 and 3, master control system 2 includes master controller 21, power module 22, touch screen display control mould
Block 23, USB communication module 24, computer control system 25, earth-continuity tester control system 26 and relay control
Module 27, the master controller 21 respectively with power module 22, touch screen display control module 23, USB communication module 24, after
Electrical control module 27, current acquisition system 3 and System of voltage acquisition 4 are electrically connected, and the USB communication module 24 is electrically connected meter
Machine control system 25 is calculated, computer control system 25 is electrically connected earth-continuity tester control system 26, the relay
Device control module 27 includes C1 relay group control module 210, C2 relay group control module 211, P1 relay group control mould
Block 28, P2 relay group control module 29, voltage acquisition relay group control module 212, current sample selective relay group control
Molding block 213, relay control module 27 respectively with C1 relay group control module 210, C2 relay group control module 211,
P1 relay group control module 28, P2 relay group control module 29, voltage acquisition relay group control module 212, electric current are adopted
Sample selective relay group control module 213 is electrically connected.The master controller 21 uses Chip Microcomputer A/D UC845.
As shown in Fig. 4, Fig. 5, Fig. 6 and Fig. 7, measuring resistance system 6 includes 10 1m Ω measuring resistances, 10 10m Ω marks
Quasi- resistance and 10 100m Ω measuring resistances, 10 1m Ω measuring resistances, 10 10m Ω measuring resistances and 10 100m Ω standards
Resistance is connected in series, composition measuring resistance row, when series connection, 10 10m Ω measuring resistances of first connecting, then the 10 1m Ω that connect
Measuring resistance, 10 100m Ω measuring resistances of finally connecting, each 10m Ω measuring resistance front end are respectively provided with a lead-out wire, should
Lead-out wire is connect after connecting with a P1 relay with P1 bus 12 or the lead-out wire connect with a C1 relay after with C1
Bus 13 connects；Lead-out wire, lead-out wire and a P1 relay are set between adjacent 10m Ω measuring resistance and 1m Ω measuring resistance
Device connection after connect with P1 bus 12 or lead-out wire connect with a C1 relay after connect with C1 bus 13；Adjacent two
Between a 1m Ω measuring resistance be arranged two lead-out wires, wherein a lead-out wire connect with a P1 relay after with P1 bus 12
Connection, another lead-out wire connect after connecting with a P2 relay with P2 bus 10, or a wherein lead-out wire and one
It is connect after the connection of C1 relay with C1 bus 13, another lead-out wire is connect after connecting with a C2 relay with C2 bus 9；Phase
A piece lead-out wire is set between adjacent 1m Ω measuring resistance and 100m Ω measuring resistance, which connect with a P2 relay
Connect afterwards with P2 bus 10 or the lead-out wire connect with a C2 relay after connect with C2 bus 9；Each 100m Ω standard
A piece lead-out wire is set between resistance, which connect after connecting with a P2 relay with P2 bus 10 or the extraction
Line is connect after connecting with a C2 relay with C2 bus 9.
As shown in figure 4,10 10m Ω measuring resistances are respectively R1, R2, R3, R4, R5, R6, R7, R8, R9, R10,10
1m Ω measuring resistance is respectively R11, R12, R13, R14, R15, R16, R17, R18, R19, R20,10 100m Ω measuring resistances
Respectively R21, R22, R23, R24, R25, R26, R27, R28, R29, R30.A lead-out wire is arranged in the front end measuring resistance R1, should
Lead-out wire is electrically connected by relay K1 with C1 bus 13, and a lead-out wire is arranged between two adjacent 10m Ω measuring resistances,
The lead-out wire is electrically connected by relay with C1 bus 13, and relay is respectively K2, K3, K4, K5, K6, K7, K8, K9, K10.Mark
A piece lead-out wire is set between quasi- resistance R10 and R11, which is electrically connected by relay K11 with C1 bus 13, adjacent
Two lead-out wires are set between two 1 m Ω measuring resistances, wherein a lead-out wire is electrically connected by relay with C1 bus 13,
These relays are respectively K12, K13, K14, K15, K16, K17, K18, K19, K20, another lead-out wire by relay with
C2 bus 9 is electrically connected, these relays are respectively K110, K120, K130, K140, K150, K160, K170, K180, K190, and 1
Between m Ω measuring resistance R20 and 100m Ω measuring resistance R21 be arranged a lead-out wire, the lead-out wire by relay K200 with
C2 bus 9 is electrically connected, and is arranged a lead-out wire between two adjacent 100m Ω measuring resistances, the lead-out wire by relay with
C2 bus 9 is electrically connected, these relays are respectively K21, K22, K23, K24, K25, K26, K27, K28, K29, the last one
A lead-out wire is arranged in the rear end of 100m Ω measuring resistance, which is electrically connected by relay K30 with C2 bus 9.
As shown in figure 5, a lead-out wire is arranged in the front end measuring resistance R1, which passes through relay J1 and P1 bus 12
It is electrically connected, a lead-out wire is set between two adjacent 10m Ω measuring resistances, which passes through relay and P1 bus 12
Electrical connection, relay is respectively J2, J3, J4, J5, J6, J7, J8, J9, J10.It is arranged one between measuring resistance R10 and R11 to draw
Outlet, the lead-out wire are electrically connected by relay J11 with P1 bus 12, are arranged two between two adjacent 1 m Ω measuring resistances
Root lead-out wire, wherein lead-out wire is electrically connected by relay with P1 bus 12, these relays be respectively J12, J13,
J14, J15, J16, J17, J18, J19, J20, another lead-out wire are electrically connected by relay with P2 bus 10, these relays
Respectively J110, J120, J130, J140, J150, J160, J170, J180, J190,1 m Ω measuring resistance R20 and 100m Ω are marked
A piece lead-out wire is set between quasi- resistance R21, which is electrically connected by relay J200 with P2 bus 10, two adjacent
A piece lead-out wire is set between 100m Ω measuring resistance, which is electrically connected by relay with P2 bus 10, these relays
Device is respectively J21, J22, J23, J24, J25, J26, J27, J28, J29, the rear end setting of the last one 100m Ω measuring resistance
A piece lead-out wire, the lead-out wire are electrically connected by relay J30 with P2 bus 10.
As can be seen from figures 8 and 9, current acquisition system 3 includes sampling resistor selection circuit 31, the alternating current-direct current being sequentially connected electrically
Preposing signal process circuit 32, level-one amplifying circuit 33, alternating current-direct current postpositive disposal circuit 36, second amplifying circuit 38 and A/D conversion electricity
Road 39, the alternating current-direct current preposing signal process circuit 32 include preposition alternating current-direct current selection circuit 312, level-one DC filtering circuit 310
And ac filter circuit 311, the DC filtering circuit and ac filter circuit 311 are arranged in parallel and select in preposition alternating current-direct current
Between circuit 312 and level-one amplifying circuit 33, the alternating current-direct current postpositive disposal circuit 36 include second level DC filtering circuit 35,
Rectification circuit 34 and postposition alternating current-direct current selection circuit 37, the second level DC filtering circuit 35 and rectification circuit 34 are arranged in parallel
Between level-one amplifying circuit 33 and postposition alternating current-direct current selection circuit 37.
As shown in Figure 10, Figure 11, the System of voltage acquisition 4 includes being sequentially connected electrically including voltage acquisition switch electricity
Road 41, differential mode amplification circuit 42, alternating current-direct current preposing signal process circuit 32, level-one amplifying circuit 33, alternating current-direct current postpositive disposal circuit 36,
Second amplifying circuit 38 and A/D conversion circuit 39, the alternating current-direct current preposing signal process circuit 32 include preposition alternating current-direct current selection electricity
Road 312, level-one DC filtering circuit 310 and ac filter circuit 311, the DC filtering circuit and ac filter circuit
311 are arranged in parallel between preposition alternating current-direct current selection circuit 312 and level-one amplifying circuit 33, the alternating current-direct current postpositive disposal electricity
Road 36 includes second level DC filtering circuit 35, rectification circuit 34 and postposition alternating current-direct current selection circuit 37, the second level direct current filter
Wave circuit 35 and rectification circuit 34 are arranged in parallel between level-one amplifying circuit 33 and postposition alternating current-direct current selection circuit 37.
When being calibrated using four termination collimation method docking ground conducting resistance testers, specific calibration steps is as follows:
(1) according to the mode of connection of Figure 13 by earth-continuity tester to be calibrated and Earth-continuity shown in FIG. 1
The connection of tester calibration system, computer is connect with the USB communication module 24 of earth-continuity tester calibration system, and
It is electrically connected by earth-continuity control module 26 with earth-continuity tester communication interface to be calibrated.
(2) according to the current range of earth-continuity tester to be calibrated and resistance test range, on computers
Setting measurement resistance value Rn；
(3) start earth-continuity tester to be calibrated；
(4) according to the measurement resistance value R of computer installationn, the master control system 2 of earth-continuity tester calibration system is in advance
Process control P1 relay group 15, P2 relay group 8, C1 relay group 14 and the C2 relay group 7 first designed acts, and starts phase
The relay answered, setting participate in the quantity and resistance value of the measuring resistance of work, such as: the measurement resistance value R of computer installationnFor
12m Ω, then:
When DC detecting is calibrated, master control system 2 controls the relay K10 in C1 relay group 14 and is closed, in C2 relay group 7
Relay K120 closure, then measuring resistance R10, R11 and R12 participate in work, the measuring resistance of 12 m Ω are obtained, at this point, master control
The relay J1 closure of 21 system of device control P1 relay group 15 processed, the relay J30 closure of P2 relay group 8；
When exchanging testing calibration, master control system 2 controls the relay K9 in C1 relay group 14 and is closed, in C2 relay group 7
Relay K130 closure, master control system 2 control P1 relay group 15 relay J10 closure, the relay of P2 relay group 8
Device J120 closure.
(5) master controller 21 is according to the sampling resistor selection circuit 31 of the process control current acquisition system 3 being pre-designed
Select one participation work measuring resistance, that is, master controller 21 control relay control module 27 current sample selection after
Electric appliance group control module 213 works, and current sample selective relay group control module 213 controls the corresponding actuating of relay, such as
R in step (4)nWhen for 12m Ω, current sample selective relay group control module 213 controls current sample selective relay group 5
Movement selects the R11 in 1m Ω measuring resistance as current sampling resistor, and the resistance value of the measuring resistance is Rx=1m Ω, electric current
Acquisition system 3 acquires the voltage of the standard resistor at two terminals, and the voltage signal is passed to preposition alternating current-direct current selection circuit 312,
Master controller 21 judges that the voltage signal is d. c. voltage signal or ac voltage signal according to setting program, and controls preposition
Alternating current-direct current selection circuit 312 selects level-one DC filtering circuit 310 or ac filter circuit 311, believes if it is DC voltage
Number, then the voltage signal enters level-one amplifying circuit 33 through level-one DC filtering circuit 310, if it is ac voltage signal, then
The voltage signal enters level-one amplifying circuit 33 through ac filter circuit 311, and the signal warp into level-one amplifying circuit 33 is first
Amplification, later, d. c. voltage signal, into postposition alternating current-direct current selection circuit 37, is handed over after secondary filter circuit filtering through postposition
After direct current selection circuit 37 selects, amplify into second amplifying circuit 38, most afterwards after A/D conversion circuit 39 is converted to voltage value
Master controller 21 is passed to, the rectified circuit 34 of ac voltage signal amplified through level-one amplifying circuit 33 is converted to direct current signal
Afterwards, after amplifying into second amplifying circuit 38, voltage value U is converted to through A/D conversion circuit 39xAfter pass to master controller 21,
Postposition alternating current-direct current selection circuit 37 is selection second amplifying circuit 38 using exchange amplification channel or direct current amplification channel.
(6) master control system 2 is according to UxAnd Rx, calculate Ix=Ux/Rx, obtain the current value of detection regulatory requirements.
(7) earth-continuity tester to be calibrated detection participates in the resistance value R of the measuring resistance of workIt reads, and should
Resistance value RIt readsMaster control system 2 is passed to, earth-continuity tester to be calibrated shows the electric current I for flowing through measuring resistanceIt is aobvious,
Master control system 2 calculates measurement error Δ R=R of earth-continuity tester to be calibratedIt reads-Rn, Δ I=IIt is aobvious- Ix, according to this
Measurement error value Δ R and current error Δ I judge whether earth-continuity tester to be calibrated is qualified.
When being calibrated using four termination collimation method docking ground conducting resistance testers, earth-continuity tester calibration system
The System of voltage acquisition 4 of system is not involved in work, and signal can be amplified 1 times, 10 by the level-one amplifying circuit 33 of current acquisition system 3
Again, 100 times or 200 times, signal can be amplified 2 times, 4 times, 8 times, 16 times, 32 times, 64 times, 128 times by second amplifying circuit 38,
Second amplifying circuit 38 is programming amplifying on master controller 21.
When being calibrated using both ends connection to earth-continuity tester, specific calibration steps is as follows,
(1) according to the mode of connection of Figure 14 by earth-continuity tester to be calibrated and Earth-continuity shown in FIG. 1
The connection of tester calibration system, computer is connect with the computer communication module of earth-continuity tester calibration system,
It is electrically connected by earth-continuity control module 26 with earth-continuity tester communication interface to be calibrated.
(2) according to the current range of earth-continuity tester to be calibrated and resistance test range, on computers
Setting measurement resistance value Rn；
(3) start earth-continuity tester to be calibrated；
(4) according to the measurement resistance value R of computer installationn, the master control system 2 of earth-continuity tester calibration system is in advance
Process control P1 relay group 15, P2 relay group 8, C1 relay group 14 and the C2 relay group 7 first designed acts, and starts phase
The relay answered, setting participate in the number combinations and resistance value of the measuring resistance of work, e.g., the measurement resistance value R of computer installationn
For 12m Ω, then, master control system 2 controls the relay K10 closure in C1 relay group 14, the relay in C2 relay group 7
K120 closure, then measuring resistance R10, R11 and R12 participate in work, obtain the measuring resistance of 12 m Ω, meanwhile, master control system 2 is controlled
P1 relay group 15 and P2 relay group 8 processed are all off；
(5) master control system 2 is selected according to the sampling resistor selection circuit 31 for the process control current acquisition system 3 being pre-designed
The measuring resistance of one participation work, that is, the current sample selective relay of the control relay control module 27 of master controller 21
Group control module 213 works, and current sample selective relay group control module 213 controls the corresponding actuating of relay, such as step
(4) R innWhen for 12m Ω, it is dynamic that current sample selective relay group control module 213 controls current sample selective relay group 5
Make, selects the R11 in 1m Ω measuring resistance as current sampling resistor, the resistance value of the measuring resistance is Rx=1m Ω, electric current are adopted
Collecting system 3 acquires the voltage of the standard resistor at two terminals, and the voltage signal is passed to preposition alternating current-direct current selection circuit 312, main
Controller 21 judges that the voltage signal is d. c. voltage signal or ac voltage signal according to setting program, and controls preposition friendship
Direct current selection circuit 312 selects level-one DC filtering circuit 310 or ac filter circuit 311, if it is d. c. voltage signal,
Then the voltage signal enters level-one amplifying circuit 33, if it is ac voltage signal, the then electricity through level-one DC filtering circuit 310
Signal is pressed to enter level-one amplifying circuit 33 through ac filter circuit 311, the signal into level-one amplifying circuit 33 is amplified for the first time,
Later, d. c. voltage signal, into postposition alternating current-direct current selection circuit 37, selects after secondary filter circuit filtering through postposition alternating current-direct current
After selecting the judgement of circuit 37, amplifies into second amplifying circuit 38, most passed to after A/D conversion circuit 39 is converted to voltage value afterwards
Master controller 21, after the rectified circuit 34 of ac voltage signal amplified through level-one amplifying circuit 33 is converted to direct current signal, into
After entering the amplification of second amplifying circuit 38, voltage value U is converted to through A/D conversion circuit 39xAfter pass to master controller 21, postposition is handed over
Direct current selection circuit 37 is selection second amplifying circuit 38 using exchange amplification channel or direct current amplification channel.
(6) master control system 2 is according to UxAnd Rx, calculate Ix=Ux/Rx, obtain the current value of detection regulatory requirements.
(7) the voltage acquisition switching circuit 41 that master controller 21 controls System of voltage acquisition 4 is closed, it may be assumed that master controller 21
Voltage acquisition relay group 11 is controlled by the voltage acquisition relay group control module 212 of relay control module 27 to be closed,
System of voltage acquisition 4 is connected, and System of voltage acquisition 4 acquires the voltage U between C1 terminals and C2 terminalsAlways, and by the voltage
After signal passes to the amplification of differential mode amplification circuit 42, preposition alternating current-direct current selection circuit 312 is passed to, master controller 21 is according to setting
Program judges that the voltage signal is d. c. voltage signal or ac voltage signal, and controls preposition alternating current-direct current selection circuit 312
Level-one DC filtering circuit 310 or ac filter circuit 311 are selected, if it is d. c. voltage signal, then the voltage signal passes through
Level-one DC filtering circuit 310 enters level-one amplifying circuit 33, and if it is ac voltage signal, then the voltage signal is filtered through exchange
Wave circuit 311 enters level-one amplifying circuit 33, and the signal into level-one amplifying circuit 33 is amplified for the first time, later, DC voltage
Signal, into postposition alternating current-direct current selection circuit 37, judges after secondary filter circuit filtering through postposition alternating current-direct current selection circuit 37
Afterwards, amplify into second amplifying circuit 38, most pass to master controller 21 after A/D conversion circuit 39 is converted to voltage value afterwards,
After the rectified circuit 34 of ac voltage signal amplified through level-one amplifying circuit 33 is converted to direct current signal, amplify electricity into second level
After road 38 is amplified, voltage value U is converted to through A/D conversion circuit 39AlwaysAfter pass to master controller 21, postposition alternating current-direct current selection circuit
37 be selection second amplifying circuit 38 using exchange amplification channel or direct current amplification channel.
(8) master control system 2 is according to UAlwaysAnd calculated current value I in step (6)x, calculate the practical electricity for participating in work
Resistance value RIt is real, calculate RIt is real =UAlways/ Ix；
(9) earth-continuity tester to be calibrated detection participates in the resistance value R of the measuring resistance of workIt reads, and by the resistance
Value RIt readsMaster control system 2 is passed to, earth-continuity tester to be calibrated shows the electric current I for flowing through measuring resistanceIt is aobvious, master control
System 2 processed calculates measurement error Δ R=R of earth-continuity tester to be calibratedIt reads-RIt is real, Δ I=IIt is aobvious- Ix, according to the survey
Amount error amount Δ R and current error Δ I judges whether earth-continuity tester to be calibrated is qualified.
In actual operation, it when being calibrated using both ends connection to earth-continuity tester, is connect to eliminate
The influence of electric shock resistance and conductor resistance to calibration result, as the measurement resistance value R of computer installationnWhen≤20m Ω, main control system
The control program set in system 2 can be controlled according to the actual resistance of measuring resistance starts corresponding relay, and setting participates in work
Measuring resistance number combinations and resistance value, e.g., the measurement resistance value R of computer installationnFor 12m Ω, then, master control system
The relay K120 in relay K10 closure, C2 relay group 7 in 2 control C1 relay groups 14 is closed, then measuring resistance
R10, R11 and R12 participate in work, obtain the measuring resistance of 12 m Ω.In the case, master control system 2 can be counted according to step (8)
The actual resistance R of calculationIt is realCalculate contact resistance and conductor resistance RDifference= RIt is real-Rn。
As the measurement resistance value R of computer installationnWhen > 20m Ω, master control system 2 participates in the standard electric of work in setting
When the number combinations and resistance value of resistance, in order to eliminate contact resistance and conductor resistance RDifference, master control system 2 is according to RDifferenceValue is reduced
The quantity of the measuring resistance of work is participated in, such as: as the measurement resistance value R of computer installationnWhen for 58m Ω, it is assumed that calculating
RDifferenceFor 4m Ω, master control system 2 controls the relay K7 closure in C1 relay group 14, the relay in C2 relay group 7
K140 closure, then measuring resistance R7, R8, R9, R10, R11, R12, R13, R14 participates in work, obtains the standard electric of 54 m Ω
Resistance, the measuring resistance of 54 m Ω add the R of 4m ΩDifferenceFinally obtain the measurement resistance value R of 58m Ωn.Meanwhile master control system 2 is controlled
P1 relay group 15 and P2 relay group 8 processed are all off.
Embodiment two
As shown in figure 12, repeat embodiment one, there is a following difference: measuring resistance system 6 includes 10 1m Ω measuring resistances, and 10
A 10m Ω measuring resistance and 10 100m Ω measuring resistances, each measuring resistance include four connecting terminals, respectively current terminal
Sub- C1, current terminal C2, current potential terminal P1 and current potential terminal P2, the current potential terminal series-shunt connection of all measuring resistances, own
Measuring resistance current terminal be connected in series, composition measuring resistance row, measuring resistance row both ends current potential terminal connect respectively
After one relay, respectively on shell 1 P1 terminals and P2 terminals connect, the current terminal C1 of each measuring resistance with
Connect after the connection of one relay with C1 bus 13, the current terminal C2 of each measuring resistance connect with a relay after with C2
Bus 9 connects, and C1 bus 13 is connect with the C1 terminals on shell 1, and C2 bus 9 is connect with the C2 terminals on shell 1.
It is noted that embodiment described above is the affiliated technology neck to the illustrative and not limiting of technical solution of the present invention
The equivalent replacement of domain those of ordinary skill or the other modifications made according to the prior art, as long as not exceeding the technology of the present invention side
The thinking and range of case, should be included within interest field of the presently claimed invention.
Claims (3)
1. a kind of earth-continuity tester calibration standard resistance system, it is characterised in that: the measuring resistance system
Including multiple measuring resistances, each measuring resistance includes four connecting terminals, respectively current terminal C1, current terminal C2, electricity
Position terminals P 1 and current potential terminal P2, the current potential terminal series-shunt connection of all measuring resistances, the current terminal of all measuring resistances
Son is connected in series, and composition measuring resistance row, the current potential terminal P1 of each measuring resistance passes through a P1 relay and P1
The current potential terminal P2 of bus electrical connection, each measuring resistance is electrically connected by a P2 relay with P2 bus, each standard electric
The current terminal C1 of resistance is electrically connected by a C1 relay with C1 bus, and the current terminal C2 of each measuring resistance passes through one
C2 relay is electrically connected with C2 bus.
2. earth-continuity tester calibration standard resistance system according to claim 1, it is characterised in that: described
Measuring resistance system include multiple 1m Ω measuring resistances, multiple 10m Ω measuring resistances and multiple 100m Ω measuring resistances, it is multiple
1m Ω measuring resistance, multiple 10m Ω measuring resistances and multiple 100m Ω measuring resistances are connected in series, composition measuring resistance row, string
When connection connection, multiple 10m Ω measuring resistances of first connecting, then multiple 1m Ω measuring resistances of connecting, multiple 100m Ω marks of finally connecting
Quasi- resistance, each 10m Ω measuring resistance front end are respectively provided with a lead-out wire, the lead-out wire connect with a P1 relay after with P1
Bus connection or the lead-out wire are connect after connecting with a C1 relay with C1 bus；Adjacent 10m Ω measuring resistance and 1m
Lead-out wire is set between Ω measuring resistance, lead-out wire connect after being connect with a P1 relay with P1 bus or lead-out wire with
It is connect after one C1 relay connection with C1 bus；Two lead-out wires are set between two adjacent 1m Ω measuring resistances, wherein
A piece lead-out wire is connect after connecting with a P1 relay with P1 bus, another lead-out wire connect with a P2 relay after with
The connection of P2 bus, or connect after wherein a lead-out wire is connect with a C1 relay with C1 bus, another lead-out wire and
It is connect after one C2 relay connection with C2 bus；One is arranged between adjacent 1m Ω measuring resistance and 100m Ω measuring resistance
Lead-out wire, which connect after connecting with a P2 relay with P2 bus or the lead-out wire and C2 relay connect
It is connect after connecing with C2 bus；A lead-out wire, the lead-out wire and a P2 relay is arranged in the rear end of each 100m Ω measuring resistance
Device connection after connect with P2 bus or the lead-out wire connect with a C2 relay after connect with C2 bus.
3. earth-continuity tester calibration standard resistance system according to claim 2, it is characterised in that: described
Measuring resistance system include 10 1m Ω measuring resistances, 10 10m Ω measuring resistances and 10 100m Ω measuring resistances.
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| CN201811484430.XA CN109581260A (en) | 2018-12-06 | 2018-12-06 | Earth-continuity tester calibration standard resistance system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110793541A (en) * | 2019-09-30 | 2020-02-14 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted instrument calibration system and method thereof |
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